Pub Date : 2024-11-14DOI: 10.1016/j.seppur.2024.130550
Pu Wang, Ziqi Ma, Xingzheng Dan, Yu Gu, Xirui Wang, Miao Chang, Hao Wu
The flue gas from coal combustion emits mass CO2 and trace SO2, which are harmful to the environment. To address the aforementioned issues, the development of a high-performance sulfur-carbon co-adsorption material is essential for the simultaneous capture of CO2 and SO2. A special hierarchical pore structure of Mg-gallate@Poly(acrylate) is synthesized here by self-nanocrystallization flexible metal–organic frameworks (MOFs) load a rigid and hydrophobic polymer macroporous surface. Adsorption results indicate that this material exhibits more pronounced characteristics, with an equivalent CO2 adsorption capacity to Mg-gallate powder and a 25 % increase in SO2 adsorption capacity. Dynamic gas adsorption data show that Mg-gallate@Poly(acrylate) has a fast adsorption rate and easy regeneration. Moreover, the adsorption performance of Mg-gallate@Poly(acrylate) in 2000 ppm SO2 slightly rises to that in a non-sulfur environment. The adsorption capacity of CO2 and SO2 can reach 76.5 and 45 mL/g, respectively. The reason for the sulfur-carbon co-adsorption of this material is further demonstrated by theoretical calculations. Additionally, Mg-gallate@Poly(acrylate) shows excellent hydrothermal stability and cyclic regenerability of SO2 and CO2. Thus, these results indicate that Mg-gallate@Poly(acrylate) satisfies the process requirements for sulfur-carbon co-adsorption.
{"title":"Rigid shell and flexible pore for highly efficient and reversible sulfur-carbon co-adsorption by hierarchical porous Mg-gallate@Poly(acrylate)","authors":"Pu Wang, Ziqi Ma, Xingzheng Dan, Yu Gu, Xirui Wang, Miao Chang, Hao Wu","doi":"10.1016/j.seppur.2024.130550","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130550","url":null,"abstract":"The flue gas from coal combustion emits mass CO<sub>2</sub> and trace SO<sub>2</sub>, which are harmful to the environment. To address the aforementioned issues, the development of a high-performance sulfur-carbon co-adsorption material is essential for the simultaneous capture of CO<sub>2</sub> and SO<sub>2</sub>. A special hierarchical pore structure of Mg-gallate@Poly(acrylate) is synthesized here by self-nanocrystallization flexible metal–organic frameworks (MOFs) load a rigid and hydrophobic polymer macroporous surface. Adsorption results indicate that this material exhibits more pronounced characteristics, with an equivalent CO<sub>2</sub> adsorption capacity to Mg-gallate powder and a 25 % increase in SO<sub>2</sub> adsorption capacity. Dynamic gas adsorption data show that Mg-gallate@Poly(acrylate) has a fast adsorption rate and easy regeneration. Moreover, the adsorption performance of Mg-gallate@Poly(acrylate) in 2000 ppm SO<sub>2</sub> slightly rises to that in a non-sulfur environment. The adsorption capacity of CO<sub>2</sub> and SO<sub>2</sub> can reach 76.5 and 45 mL/g, respectively. The reason for the sulfur-carbon co-adsorption of this material is further demonstrated by theoretical calculations. Additionally, Mg-gallate@Poly(acrylate) shows excellent hydrothermal stability and cyclic regenerability of SO<sub>2</sub> and CO<sub>2</sub>. Thus, these results indicate that Mg-gallate@Poly(acrylate) satisfies the process requirements for sulfur-carbon co-adsorption.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"80 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130531
Qi Feng , Yanbing Sun , Xuguang Li , Jing Zhao , Penghui Zhu , Chi Zhang , Donghua Fan
The growing energy crisis and environmental concerns demand sustainable energy solutions, with hydrogen emerging as a promising alternative due to its zero emissions and high energy density. While water electrolysis is ideal and sustainable approach for hydrogen production, it requires efficient electrocatalysts for the hydrogen evolution reaction (HER). Platinum (Pt) is highly effective but costly and less active in alkaline media, prompting research into other alternatives. Ruthenium (Ru), particularly in the form of RuTe2, has emerged as a promising alternative due to its better hydrolytic dissociation capacity and lower cost. This study introduces an amorphous/crystalline heterostructure catalyst (a-RuTe@c-Te) for enhanced alkaline HER. The catalyst was synthesized through a green method, producing a porous amorphous RuTe layer on the crystalline Te nanotubes. The a-RuTe@c-Te catalyst demonstrated superior HER activity, with a low overpotential of 27 mV at 10 mA cm−2 in 1 M KOH, outperforming commercial Pt/C and crystalline RuTe2. The density functional theory (DFT) calculations reveal that the d-band center of a-RuTe@c-Te was pulled up closer to Fermi level by the electron enrichments at the amorphous/crystalline interface, leading to a reduced electron filling in the antibonding orbitals, thus increasing the hydrogen adsorption strength. This work offers a promising approach for designing high-performance HER catalysts, advancing sustainable energy applications.
日益严重的能源危机和环境问题需要可持续的能源解决方案，而氢气因其零排放和高能量密度成为一种前景广阔的替代能源。水电解是理想的可持续制氢方法，但它需要高效的电催化剂来进行氢进化反应（HER）。铂（Pt）非常有效，但价格昂贵，而且在碱性介质中活性较低，这促使人们研究其他替代品。钌（Ru），尤其是 RuTe2 形式的钌，因其水解解离能力更强、成本更低，已成为一种很有前途的替代品。本研究介绍了一种用于增强碱性 HER 的非晶/晶体异质结构催化剂（a-RuTe@c-Te）。该催化剂采用绿色方法合成，在结晶 Te 纳米管上生成多孔无定形 RuTe 层。a-RuTe@c-Te 催化剂表现出卓越的 HER 活性，在 1 M KOH 中 10 mA cm-2 的过电位低至 27 mV，优于商用 Pt/C 和晶体 RuTe2。密度泛函理论（DFT）计算显示，a-RuTe@c-Te 的 d 带中心被非晶/晶体界面的电子富集拉高至费米水平，导致反键轨道的电子填充减少，从而增加了氢吸附强度。这项工作为设计高性能 HER 催化剂、推进可持续能源应用提供了一种前景广阔的方法。
{"title":"A novel amorphous/crystalline RuTe heterostructure catalyst for efficient and sustainable hydrogen production","authors":"Qi Feng , Yanbing Sun , Xuguang Li , Jing Zhao , Penghui Zhu , Chi Zhang , Donghua Fan","doi":"10.1016/j.seppur.2024.130531","DOIUrl":"10.1016/j.seppur.2024.130531","url":null,"abstract":"<div><div>The growing energy crisis and environmental concerns demand sustainable energy solutions, with hydrogen emerging as a promising alternative due to its zero emissions and high energy density. While water electrolysis is ideal and sustainable approach for hydrogen production, it requires efficient electrocatalysts for the hydrogen evolution reaction (HER). Platinum (Pt) is highly effective but costly and less active in alkaline media, prompting research into other alternatives. Ruthenium (Ru), particularly in the form of RuTe<sub>2</sub>, has emerged as a promising alternative due to its better hydrolytic dissociation capacity and lower cost. This study introduces an amorphous/crystalline heterostructure catalyst (a-RuTe@c-Te) for enhanced alkaline HER. The catalyst was synthesized through a green method, producing a porous amorphous RuTe layer on the crystalline Te nanotubes. The a-RuTe@c-Te catalyst demonstrated superior HER activity, with a low overpotential of 27 mV at 10 mA cm<sup>−2</sup> in 1 M KOH, outperforming commercial Pt/C and crystalline RuTe<sub>2</sub>. The density functional theory (DFT) calculations reveal that the d-band center of a-RuTe@c-Te was pulled up closer to Fermi level by the electron enrichments at the amorphous/crystalline interface, leading to a reduced electron filling in the antibonding orbitals, thus increasing the hydrogen adsorption strength. This work offers a promising approach for designing high-performance HER catalysts, advancing sustainable energy applications.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130531"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130527
Jie Tian , Hongqiang Yang , Yaqin Hou , Jia Hong Pan , Zhanggen Huang
Meal halide perovskites in standalone configurations face challenges in terms of their fragile stability and charge recombination, which hinders their widespread application in the realm of photocatalysis. In this work, a series of Cs3BiSbBr9/GO (graphene oxide) nanocomposites with different amount of GO nanosheets decorated contents were successfully synthesized and used for CO2 photoreduction performance evaluation. Among them, the photocatalytic performance of Cs3BiSbBr9/GO (10 wt%) increased steadily within 9 h, the CO yield reached 60.71 μmol·g−1·h−1, and the EQE increased over two times. Carrier dynamics studies revealed that the Cs3BiSbBr9/GO (10 wt%) composite enhanced the generation capability of O2− radicals and facilitated the charge transfer from Cs3BiSbBr9 to GO. The surface reaction mechanism confirmed that the photocatalytic CO2 reudction over Cs3BiSbBr9/GO nanocomposite followed the carbonate path, and the oxygen functional group at the edge of GO was conducive to the adsorption and activation of CO2. Our Cs3BiSbBr9/GO photocatalyst is expected to be a promising candidate in the field of CO2 photoreduction.
独立配置的 MHP NCs 面临着稳定性脆弱和电荷重组的挑战，这阻碍了它们在光催化领域的广泛应用。本研究成功合成了一系列不同 GO 含量的 Cs3BiSbBr9/GO 复合材料，并将其用于 CO2 光催化性能评估。其中，Cs3BiSbBr9/GO（10 wt%）的光催化性能在 9 h 内稳步提高，CO 产率达到 60.71 μmol-g-1-h-1，EQE 提高了 2 倍以上。载流子动力学研究表明，Cs3BiSbBr9/GO（10 wt%）复合材料增强了 ROS O2- 的生成能力，促进了 Cs3BiSbBr9 向 GO 的电荷转移。表面反应机理证实，该复合材料遵循碳酸盐路径，GO 边缘的氧官能团有利于 CO2 的吸附和活化。Cs3BiSbBr9/GO 光催化剂有望成为 CO2 光还原领域的理想候选材料。
{"title":"Charge transfer and interfacial binding strategy: Enhancing photocatalytic CO2 reduction efficiency in graphene oxide-modified Cs3BiSbBr9 halide perovskites","authors":"Jie Tian , Hongqiang Yang , Yaqin Hou , Jia Hong Pan , Zhanggen Huang","doi":"10.1016/j.seppur.2024.130527","DOIUrl":"10.1016/j.seppur.2024.130527","url":null,"abstract":"<div><div>Meal halide perovskites in standalone configurations face challenges in terms of their fragile stability and charge recombination, which hinders their widespread application in the realm of photocatalysis. In this work, a series of Cs<sub>3</sub>BiSbBr<sub>9</sub>/GO (graphene oxide) nanocomposites with different amount of GO nanosheets decorated contents were successfully synthesized and used for CO<sub>2</sub> photoreduction performance evaluation. Among them, the photocatalytic performance of Cs<sub>3</sub>BiSbBr<sub>9</sub>/GO (10 wt%) increased steadily within 9 h, the CO yield reached 60.71 μmol·g<sup>−1</sup>·h<sup>−1</sup>, and the EQE increased over two times. Carrier dynamics studies revealed that the Cs<sub>3</sub>BiSbBr<sub>9</sub>/GO (10 wt%) composite enhanced the generation capability of <sup><img></sup>O<sub>2</sub><sup>−</sup> radicals and facilitated the charge transfer from Cs<sub>3</sub>BiSbBr<sub>9</sub> to GO. The surface reaction mechanism confirmed that the photocatalytic CO<sub>2</sub> reudction over Cs<sub>3</sub>BiSbBr<sub>9</sub>/GO nanocomposite followed the carbonate path, and the oxygen functional group at the edge of GO was conducive to the adsorption and activation of CO<sub>2</sub>. Our Cs<sub>3</sub>BiSbBr<sub>9</sub>/GO photocatalyst is expected to be a promising candidate in the field of CO<sub>2</sub> photoreduction.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130527"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130532
Mohamad Alif Hakimi Hamdan , Rais Hanizam Madon , Nur Hanis Hayati Hairom , Mohd Khairul Ahmad , Siti Nurfatin Nadhirah Mohd Makhtar , Noor Kamalia Abd Hamed
A study evaluated a pilot-scale hybrid membrane photocatalytic reactor (MPR) using ZnO-Kaolin to treat polluted river water. ZnO-Kaolin was successfully synthesised and characterised using various methods, such as X-ray diffraction (XRD), fourier-transform infrared (FTIR), and field emission scanning electron microscopy (FESEM). XRD and FTIR analyses verified the purity of ZnO-Kaolin, showing no impurities, while FESEM revealed ZnO nanoparticle growth on kaolin surfaces. Additionally, the ZnO-Kaolin band gap was shifted, demonstrating enhancement of photo-degradation efficiency. Optimisation identified pH 5 as the most effective condition for treating the polluted Sembrong River via pilot-scale hybrid MPR integrated with ZnO-Kaolin, achieving significant removal of ammoniacal nitrogen (85.71 %), chemical oxygen demand (91.53 %), biochemical oxygen demand (84.93 %), and suspended solids (99 %). This innovative system also regulated water quality parameters, enhancing pH to 6 and dissolved oxygen to 6.3 mg/L while minimising membrane fouling. This innovative approach has promising potential for commercial-scale water pollution control.
{"title":"Improving membrane fouling via high phyllosilicate properties of ZnO-Kaolin in pilot-scale hybrid membrane photocatalytic reactor (MPR) for superior river water treatment","authors":"Mohamad Alif Hakimi Hamdan , Rais Hanizam Madon , Nur Hanis Hayati Hairom , Mohd Khairul Ahmad , Siti Nurfatin Nadhirah Mohd Makhtar , Noor Kamalia Abd Hamed","doi":"10.1016/j.seppur.2024.130532","DOIUrl":"10.1016/j.seppur.2024.130532","url":null,"abstract":"<div><div>A study evaluated a pilot-scale hybrid membrane photocatalytic reactor (MPR) using ZnO-Kaolin to treat polluted river water. ZnO-Kaolin was successfully synthesised and characterised using various methods, such as X-ray diffraction (XRD), fourier-transform infrared (FTIR), and field emission scanning electron microscopy (FESEM). XRD and FTIR analyses verified the purity of ZnO-Kaolin, showing no impurities, while FESEM revealed ZnO nanoparticle growth on kaolin surfaces. Additionally, the ZnO-Kaolin band gap was shifted, demonstrating enhancement of photo-degradation efficiency. Optimisation identified pH 5 as the most effective condition for treating the polluted Sembrong River via pilot-scale hybrid MPR integrated with ZnO-Kaolin, achieving significant removal of ammoniacal nitrogen (85.71 %), chemical oxygen demand (91.53 %), biochemical oxygen demand (84.93 %), and suspended solids (99 %). This innovative system also regulated water quality parameters, enhancing pH to 6 and dissolved oxygen to 6.3 mg/L while minimising membrane fouling. This innovative approach has promising potential for commercial-scale water pollution control.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130532"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130496
Katarzyna Szwaczko , Dorota Kołodyńska , Beata Podkościelna
The development of new functionalized adsorbents in the form of polymeric microspheres, based on triethoxyvinylsilane (TEVS) and ethylene glycol dimethacrylate (EGDMA), has been achieved. These adsorbents were created by incorporating coumarin additives, synthesized in an environmentally friendly manner, into the TEVS-EGDMA polymer matrix. This includes coumarin-3-carboxylic acid and its ester derivatives (CRM1-4). The newly developed adsorbents (TEVS-EGDMA-CRM1, TEVS-EGDMA-CRM2, TEVS-EGDMA-CRM3, and TEVS-EGDMA-CRM4) have been applied for the removal of Cd(II) from aqueous solutions. The material was characterized using spectral techniques like pHzpc, ATR-FTIR, SEM with EDS, DSC, and specific surface area (SBET). The maximum adsorption capacity for Cd(II) is 58.73, 59.03, 59.16, 63.07 and 64.26 mg/g at pH 6.5, pHzpc 6.16, 6.28, 6.40, 6.49, and 6.63, and equilibration time of 240 min, respectively. The addition of coumarins to the microspheres improves the thermal resistance of samples. The kinetics are well-fitted by the pseudo-second-order kinetic model (R2 > 0.99). The equilibrium adsorption data are fitted by the Langmuir, Freundlich and Dubinin-Raduskevich isotherms. The adsorption capacities calculated from the Langmuir model agree with the experimental results.
{"title":"Functionalized TEVS-EGDMA microspheres for efficient cadmium(II) removal: Synthesis, characterization, and adsorption performance","authors":"Katarzyna Szwaczko , Dorota Kołodyńska , Beata Podkościelna","doi":"10.1016/j.seppur.2024.130496","DOIUrl":"10.1016/j.seppur.2024.130496","url":null,"abstract":"<div><div>The development of new functionalized adsorbents in the form of polymeric microspheres, based on triethoxyvinylsilane (TEVS) and ethylene glycol dimethacrylate (EGDMA), has been achieved. These adsorbents were created by incorporating coumarin additives, synthesized in an environmentally friendly manner, into the TEVS-EGDMA polymer matrix. This includes coumarin-3-carboxylic acid and its ester derivatives (CRM1-4). The newly developed adsorbents (TEVS-EGDMA-CRM1, TEVS-EGDMA-CRM2, TEVS-EGDMA-CRM3, and TEVS-EGDMA-CRM4) have been applied for the removal of Cd(II) from aqueous solutions. The material was characterized using spectral techniques like pH<sub>zpc</sub>, ATR-FTIR, SEM with EDS, DSC, and specific surface area (S<sub>BET</sub>). The maximum adsorption capacity for Cd(II) is 58.73, 59.03, 59.16, 63.07 and 64.26 mg/g at pH 6.5, pH<sub>zpc</sub> 6.16, 6.28, 6.40, 6.49, and 6.63, and equilibration time of 240 min, respectively. The addition of coumarins to the microspheres improves the thermal resistance of samples. The kinetics are well-fitted by the pseudo-second-order kinetic model (R<sup>2</sup> > 0.99). The equilibrium adsorption data are fitted by the Langmuir, Freundlich and Dubinin-Raduskevich isotherms. The adsorption capacities calculated from the Langmuir model agree with the experimental results.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130496"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130530
Shuo Li , Shangzhen Xie , Guopeng Chen , Congji Zhang , Kang Xiang , Zhiguang Guo
In recent years, the rising concerns regarding oil pollution and the emissions of organic pollutants from industrial activities have posed significant environmental and public health challenges. The treatment of oily wastewater and organic pollutants has emerged as pressing issue, necessitating the development of efficient solutions. Oil-water separation stands out as a promising approach to address these challenges. However, the effictiveness and robustness of the separating membranes have been identified as key limitations hindering the advancement of oil–water separation technologiess. This paper introduces a novel superhydrophilic/underwater superoleophobic membrane tailored specifically for oil–water separation with enhanced water flux. This film is prepared by depositing candle soot on a stainless steel mesh and then polymerizing phytic acid (CSM-PA). The contact angle of CSM-PA membranes underwater for a wide range of oils is above 140°, reaching a maximum of 152.73°. The CSM-PA membrane demonstrates excellent separation performance for various oils, achieving separation efficiencies flux surpassing 99.990 %, achieving separation efficiencies flux surpassing 18950.360 L·m−2·h−1. Notably, the membrane exhibits contact angles under water exceeding 142° for all oils tested. After conducting immersion, sand impact, and water impact tests, the underwater contact angle for both light and heavy oils was found to exceed 139°. The surface roughness of the CSM-PA film on the initial stainless steel mesh improved significantly, increasing from 106 nm to 452 nm. Impressively, even after 70 cycles, the CSM-PA membrane maintains an oil (n-hexane) water separation efficiency exceeding 99.997 % and a remarkable flux rate of 21055.956 L·m−2·h−1, the maximum separation flux is even 29154.400 L·m−2·h−1. Furthermore, the CSM-PA membrane shows significant stability and resistance to mechanical abrasion, ensuring long-term and reliable operational performance. The findings of this study hold significant implications for the advancement of oil–water separation technologies, offering a promising avenue for addressing oil pollution and organic pollutant emissions in a sustainable and effective manner.
{"title":"Robust and efficient oil-water separation using candle soot deposited stainless steel mesh","authors":"Shuo Li , Shangzhen Xie , Guopeng Chen , Congji Zhang , Kang Xiang , Zhiguang Guo","doi":"10.1016/j.seppur.2024.130530","DOIUrl":"10.1016/j.seppur.2024.130530","url":null,"abstract":"<div><div>In recent years, the rising concerns regarding oil pollution and the emissions of organic pollutants from industrial activities have posed significant environmental and public health challenges. The treatment of oily wastewater and organic pollutants has emerged as pressing issue, necessitating the development of efficient solutions. Oil-water separation stands out as a promising approach to address these challenges. However, the effictiveness and robustness of the separating membranes have been identified as key limitations hindering the advancement of oil–water separation technologiess. This paper introduces a novel superhydrophilic/underwater superoleophobic membrane tailored specifically for oil–water separation with enhanced water flux. This film is prepared by depositing candle soot on a stainless steel mesh and then polymerizing phytic acid (CSM-PA). The contact angle of CSM-PA membranes underwater for a wide range of oils is above 140°, reaching a maximum of 152.73°. The CSM-PA membrane demonstrates excellent separation performance for various oils, achieving separation efficiencies flux surpassing 99.990 %, achieving separation efficiencies flux surpassing 18950.360 L·m<sup>−2</sup>·h<sup>−1</sup>. Notably, the membrane exhibits contact angles under water exceeding 142° for all oils tested. After conducting immersion, sand impact, and water impact tests, the underwater contact angle for both light and heavy oils was found to exceed 139°. The surface roughness of the CSM-PA film on the initial stainless steel mesh improved significantly, increasing from 106 nm to 452 nm. Impressively, even after 70 cycles, the CSM-PA membrane maintains an oil (n-hexane) water separation efficiency exceeding 99.997 % and a remarkable flux rate of 21055.956 L·m<sup>−2</sup>·h<sup>−1</sup>, the maximum separation flux is even 29154.400 L·m<sup>−2</sup>·h<sup>−1</sup>. Furthermore, the CSM-PA membrane shows significant stability and resistance to mechanical abrasion, ensuring long-term and reliable operational performance. The findings of this study hold significant implications for the advancement of oil–water separation technologies, offering a promising avenue for addressing oil pollution and organic pollutant emissions in a sustainable and effective manner.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130530"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130525
Zhaohao Li , Tianjing An , Jiaxi Yang , Dan Gao , Hongyuan Zhang , Heng Zhang
Capturing CO2 from the flue gas in the power plant is an important measure to realize the low-carbon combustion of the fossil energy. This paper presents a novel technique which combines traditional methods of the chemical absorption, the physical adsorption and the membrane absorption. The ionic liquid ([TEPA][MIm]) is utilized to improve the CO2 absorption performance and reduce the energy consumption. While the porous skeleton (ZIF-8) is added to the ionic liquid to reduce the viscosity while introducing the physical adsorption. Moreover, the hydrophobic ceramic membrane is utilized as the separation interface between the gas phase and the liquid phase, which can avoid the entrainment and overflow of the liquid phase while increasing the specific surface area. In terms of the material preparation and the characterization, the addition of ZIF-8 does not destroy the original chemical composition of [TEPA][MIm]. The average contact angle of the hydrophobic ceramic membrane is 140.55°, and the failure temperature is greater than 400 K, which conforms to the application situation of the power plant. In terms of the CO2 capture and the desorption performance, the maximum CO2 capture amount reaches 2.03 mol/mol. The temperature of complete desorption is 70 °C. Furthermore, the capture performance after five cycles can reach 80 % of the initial performance. The performance is better than that of the CO2 capture technology utilizing the traditional monoethanolamine solution.
{"title":"CO2/N2 separation using a ceramic membrane contactor and ZIF-8 in [TEPA][MIm]","authors":"Zhaohao Li , Tianjing An , Jiaxi Yang , Dan Gao , Hongyuan Zhang , Heng Zhang","doi":"10.1016/j.seppur.2024.130525","DOIUrl":"10.1016/j.seppur.2024.130525","url":null,"abstract":"<div><div>Capturing CO<sub>2</sub> from the flue gas in the power plant is an important measure to realize the low-carbon combustion of the fossil energy. This paper presents a novel technique which combines traditional methods of the chemical absorption, the physical adsorption and the membrane absorption. The ionic liquid ([TEPA][MIm]) is utilized to improve the CO<sub>2</sub> absorption performance and reduce the energy consumption. While the porous skeleton (ZIF-8) is added to the ionic liquid to reduce the viscosity while introducing the physical adsorption. Moreover, the hydrophobic ceramic membrane is utilized as the separation interface between the gas phase and the liquid phase, which can avoid the entrainment and overflow of the liquid phase while increasing the specific surface area. In terms of the material preparation and the characterization, the addition of ZIF-8 does not destroy the original chemical composition of [TEPA][MIm]. The average contact angle of the hydrophobic ceramic membrane is 140.55°, and the failure temperature is greater than 400 K, which conforms to the application situation of the power plant. In terms of the CO<sub>2</sub> capture and the desorption performance, the maximum CO<sub>2</sub> capture amount reaches 2.03 mol/mol. The temperature of complete desorption is 70 °C. Furthermore, the capture performance after five cycles can reach 80 % of the initial performance. The performance is better than that of the CO<sub>2</sub> capture technology utilizing the traditional monoethanolamine solution.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130525"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130407
J.H. Park, D. Ahn
Eddy current separators, which are widely used in the recycling industry for the separation of non-ferrous metals, rely on the electromagnetic repulsion generated by eddy currents induced by a rotating magnet drum. As such, enhancing the separation rate of the magnet drum is vital for the recycling industry. Despite the existence of various studies aimed at improving the separation rate, the issues associated with the magnet drum’s sleeve remain unaddressed. This study introduces a comprehensive methodology for designing magnet drum sleeves for use in eddy current separation systems. A stress model was developed to analyze the relationships between the sleeve’s primary design parameters, such as interference fit and thickness, and various secondary parameters, such as rotation speed, size, material properties, and manufacturing processes. This study proposes optimal design points to minimize sleeve thickness, potentially enhancing both separation efficiency and design flexibility. The study’s findings emphasize the importance of maximizing the interference fit to maintain compressive stress between the magnet and core, preventing magnet scattering. However, there is a limit to increasing the interference fit due to sleeve breakage, and there are also certain constraints, such as the fact that material properties and manufacturing tolerances often require increased sleeve thickness. The analysis used in this study integrates these factors, emphasizing the sleeve’s critical role in eddy current separation systems. The results demonstrate the potential for more precise and improved designs that will enable higher rotation speeds, stronger magnetic fields and induced force, and narrower gaps between the magnet drum and the target objects, thereby enhancing the separation performance to a significant degree.
{"title":"Design and analysis of a thin sleeve for high-speed magnet drums in eddy current separation systems","authors":"J.H. Park, D. Ahn","doi":"10.1016/j.seppur.2024.130407","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130407","url":null,"abstract":"Eddy current separators, which are widely used in the recycling industry for the separation of non-ferrous metals, rely on the electromagnetic repulsion generated by eddy currents induced by a rotating magnet drum. As such, enhancing the separation rate of the magnet drum is vital for the recycling industry. Despite the existence of various studies aimed at improving the separation rate, the issues associated with the magnet drum’s sleeve remain unaddressed. This study introduces a comprehensive methodology for designing magnet drum sleeves for use in eddy current separation systems. A stress model was developed to analyze the relationships between the sleeve’s primary design parameters, such as interference fit and thickness, and various secondary parameters, such as rotation speed, size, material properties, and manufacturing processes. This study proposes optimal design points to minimize sleeve thickness, potentially enhancing both separation efficiency and design flexibility. The study’s findings emphasize the importance of maximizing the interference fit to maintain compressive stress between the magnet and core, preventing magnet scattering. However, there is a limit to increasing the interference fit due to sleeve breakage, and there are also certain constraints, such as the fact that material properties and manufacturing tolerances often require increased sleeve thickness. The analysis used in this study integrates these factors, emphasizing the sleeve’s critical role in eddy current separation systems. The results demonstrate the potential for more precise and improved designs that will enable higher rotation speeds, stronger magnetic fields and induced force, and narrower gaps between the magnet drum and the target objects, thereby enhancing the separation performance to a significant degree.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"72 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130521
Ting Zhang, Yang Liu, Jingjing Zhang, Jiaojiao Qiao, Xiaohui Yang, Tingting Li, Yi Wang
In this study, attapulgite (ATP) was made to unfolded in two-dimension on the surface of graphene oxide (GO) and metal oxides were loaded on it as active substances to prepare a multifunctional membrane material (Fe-Cu/ATP-GO) through an innovative pizza-like preparation method. The fabrication process of this composite membrane has undergone rigorous optimization to ensure optimal performance. In order to get insights into its structural and compositional features, the composite membrane was thoroughly investigated by XRD, FTIR, SEM, BET analysis, XPS, and TG, which showed ATP was uniformly dispersed on the surface of GO membrane and both Fe and Cu were successfully and uniformly loaded on the surface of ATP-GO membrane. The application of the Fe-Cu/ATP-GO membrane in treating wastewater contaminated with methylene blue (MB) or ciprofloxacin (CIP) showed over 90 % removal ratio of MB and over 70 % removal ratio of CIP after 10 min dynamic treatment experiments under optimal conditions, revealed its exceptional ability to effectively eliminate organic contaminants from water. Further mechanistic studies have shed light on the multifaceted treatment mechanisms employed by the composite membrane, including filtration, adsorption, and catalytic oxidation, etc. These mechanisms synergistically contribute to the membrane’s remarkable performance in removing refractory organics from water.
在这项研究中，通过一种创新的披萨状制备方法，将阿塔蓬石（ATP）在氧化石墨烯（GO）表面二维展开，并在其上负载金属氧化物作为活性物质，制备出一种多功能膜材料（Fe-Cu/ATP-GO）。这种复合膜的制备过程经过了严格的优化，以确保达到最佳性能。为了深入了解其结构和组成特征，研究人员通过 XRD、FTIR、SEM、BET 分析、XPS 和 TG 对该复合膜进行了深入研究，结果表明 ATP 均匀地分散在 GO 膜的表面，而铁和铜也成功、均匀地负载在 ATP-GO 膜的表面。将铁-铜/ATP-GO 膜应用于处理亚甲基蓝（MB）或环丙沙星（CIP）污染的废水，在最佳条件下经过 10 分钟的动态处理实验后，MB 的去除率超过 90%，CIP 的去除率超过 70%，显示了其有效去除水中有机污染物的卓越能力。进一步的机理研究揭示了复合膜所采用的多元处理机制，包括过滤、吸附和催化氧化等。这些机制协同作用，使该膜在去除水中难降解有机物方面表现出色。
{"title":"Study on preparation of a pizza-like attapulgite-based composite membrane and its performance on methylene blue and ciprofloxacin removal","authors":"Ting Zhang, Yang Liu, Jingjing Zhang, Jiaojiao Qiao, Xiaohui Yang, Tingting Li, Yi Wang","doi":"10.1016/j.seppur.2024.130521","DOIUrl":"10.1016/j.seppur.2024.130521","url":null,"abstract":"<div><div>In this study, attapulgite (ATP) was made to unfolded in two-dimension on the surface of graphene oxide (GO) and metal oxides were loaded on it as active substances to prepare a multifunctional membrane material (Fe-Cu/ATP-GO) through an innovative pizza-like preparation method. The fabrication process of this composite membrane has undergone rigorous optimization to ensure optimal performance. In order to get insights into its structural and compositional features, the composite membrane was thoroughly investigated by XRD, FTIR, SEM, BET analysis, XPS, and TG, which showed ATP was uniformly dispersed on the surface of GO membrane and both Fe and Cu were successfully and uniformly loaded on the surface of ATP-GO membrane. The application of the Fe-Cu/ATP-GO membrane in treating wastewater contaminated with methylene blue (MB) or ciprofloxacin (CIP) showed over 90 % removal ratio of MB and over 70 % removal ratio of CIP after 10 min dynamic treatment experiments under optimal conditions, revealed its exceptional ability to effectively eliminate organic contaminants from water. Further mechanistic studies have shed light on the multifaceted treatment mechanisms employed by the composite membrane, including filtration, adsorption, and catalytic oxidation, etc. These mechanisms synergistically contribute to the membrane’s remarkable performance in removing refractory organics from water.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130521"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.seppur.2024.130517
Yujun Zhao , Haiyang Cheng , Yangyang Wang
A sustainable and efficient process for separating diethoxymethane/ethanol/water azeotropic systems was proposed via a mixed solvent as an entrainer and thermal coupling technology to enhance the extractive distillation process. The microscopic mechanisms between different molecules were precisely explored through molecular simulation technology, and suitable candidate entrainers were determined. On this basis, extractive distillation processes using different solvents as entrainer were further designed. The operation parameters of the process were improved by multi-objective optimization. The extractive distillation process coupled with heat pump and heat integration technology was further brought in based on the optimal solvent extractive distillation process. The results indicate that the intensification process reduces the total annual cost by 3.14% and gas emissions by 29.02% compared to the basic process. This study not only provides a new idea for the design of extractive distillation process, but more importantly, it provides a reference for the screening and industrial application of mixed entrainer.
{"title":"Separation for diethoxymethane/ethanol/water by a thermally coupled extractive pressure swing distillation process with mixed solvent","authors":"Yujun Zhao , Haiyang Cheng , Yangyang Wang","doi":"10.1016/j.seppur.2024.130517","DOIUrl":"10.1016/j.seppur.2024.130517","url":null,"abstract":"<div><div>A sustainable and efficient process for separating diethoxymethane/ethanol/water azeotropic systems was proposed via a mixed solvent as an entrainer and thermal coupling technology to enhance the extractive distillation process. The microscopic mechanisms between different molecules were precisely explored through molecular simulation technology, and suitable candidate entrainers were determined. On this basis, extractive distillation processes using different solvents as entrainer were further designed. The operation parameters of the process were improved by multi-objective optimization. The extractive distillation process coupled with heat pump and heat integration technology was further brought in based on the optimal solvent extractive distillation process. The results indicate that the intensification process reduces the total annual cost by 3.14% and gas emissions by 29.02% compared to the basic process. This study not only provides a new idea for the design of extractive distillation process, but more importantly, it provides a reference for the screening and industrial application of mixed entrainer.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130517"},"PeriodicalIF":8.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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