Sulfadiazine (SDZ), a potent antibiotic resistant to conventional biological treatment, presents considerable environmental risks if discharged untreated. Electro-Fenton (EF) is a promising technology in SDZ removal. However, oxygen reduction reaction (ORR) performance deterioration caused by iron deposition and the diverse optimal operating conditions for ORR and ferric reduction reaction (FRR) significantly affect the durability and the SDZ removal efficiency in EF system. In this study, a dual-stage spatiotemporal separation heterogeneous EF system was constructed, employing an air-breathing cathode (ABC) in the first stage and a Fe0-Fe3O4/CF cathode in the second stage, which effectively addresses the inherent limitations of EF systems by separating the ORR, H2O2 activation, and FRR spatiotemporally. A novel K2FeO4 etching method was employed to fabricate the Fe0-Fe3O4/CF cathode, ensuring uniformly dispersed active sites within pores. Under optimal operating conditions, the system achieved complete SDZ degradation in 10 min and 80.42 % total organic carbon (TOC) removal. High Fe(II) retention (55.12 %) on Fe0-Fe3O4/CF25 after reaction was observed due to effective FRR. Mechanism studies confirmed that ·OH generated from heterogeneous Fenton dominated SDZ degradation, with DFT analysis confirming electron transfer from SDZ to ·OH. The system demonstrated high durability and low energy consumption, maintaining the ability to completely degrade SDZ in 30 min after six uses, with an energy consumption of 8.48 kWh (kg SDZ)-1 and 0.26 kWh (g TOC)-1. These findings provide ideas for constructing EF systems with higher SDZ removal efficiency and durability.
{"title":"Spatiotemporally optimized dual-stage electro-Fenton system with etched Fe⁰-Fe3O4/CF cathode for efficient sulfadiazine degradation","authors":"Yanshi Zheng, Jinyan Yang, Mei Li, Jiayu Liang, Dehai Yu, Ziyao Wang, Xiao Shan, Gaofeng Pan, Jianchuan Pei","doi":"10.1016/j.seppur.2025.131756","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131756","url":null,"abstract":"Sulfadiazine (SDZ), a potent antibiotic resistant to conventional biological treatment, presents considerable environmental risks if discharged untreated. Electro-Fenton (EF) is a promising technology in SDZ removal. However, oxygen reduction reaction (ORR) performance deterioration caused by iron deposition and the diverse optimal operating conditions for ORR and ferric reduction reaction (FRR) significantly affect the durability and the SDZ removal efficiency in EF system. In this study, a dual-stage spatiotemporal separation heterogeneous EF system was constructed, employing an air-breathing cathode (ABC) in the first stage and a Fe<sup>0</sup>-Fe<sub>3</sub>O<sub>4</sub>/CF cathode in the second stage, which effectively addresses the inherent limitations of EF systems by separating the ORR, H<sub>2</sub>O<sub>2</sub> activation, and FRR spatiotemporally. A novel K<sub>2</sub>FeO<sub>4</sub> etching method was employed to fabricate the Fe<sup>0</sup>-Fe<sub>3</sub>O<sub>4</sub>/CF cathode, ensuring uniformly dispersed active sites within pores. Under optimal operating conditions, the system achieved complete SDZ degradation in 10 min and 80.42 % total organic carbon (TOC) removal. High Fe(II) retention (55.12 %) on Fe<sup>0</sup>-Fe<sub>3</sub>O<sub>4</sub>/CF<sub>25</sub> after reaction was observed due to effective FRR. Mechanism studies confirmed that ·OH generated from heterogeneous Fenton dominated SDZ degradation, with DFT analysis confirming electron transfer from SDZ to ·OH. The system demonstrated high durability and low energy consumption, maintaining the ability to completely degrade SDZ in 30 min after six uses, with an energy consumption of 8.48 kWh (kg SDZ)<sup>-1</sup> and 0.26 kWh (g TOC)<sup>-1</sup>. These findings provide ideas for constructing EF systems with higher SDZ removal efficiency and durability.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"74 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020872","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131775
Yu Zhang, Rui Wang
Reinforcing the development of efficient catalysts is crucial for addressing the challenges associated with NOx removal technologies. Herein, we present a unique method for the in situ production of halogen-doped NiCoMoOx catalysts utilizing a crystallization-thermal decomposition mechanism and the use of such catalysts for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The formation of lattice defect (oxygen vacancies) and surface acid sites on Br-doped NiCoMoOx catalyst was considerably enhanced compared with that on pure NiCoMoOx, resulting in highly efficient reduction of NOx and a broader temperature operating range. The 2Br-NiCoMoOx catalyst achieved the highest NOx conversion of 97.2 % at 250°C, while NiCoMoOx was only 83 %, and the NOx conversion was always above 80 % in a wide temperature window of 200 to 350 °C. Through comprehensive characterization, it was also revealed that the introduction of Br enhanced the low temperature redox performance and the adsorption and activation of NO and NH3 on the catalyst surface, which played a crucial role in facilitating the reaction between NO and NH3. Furthermore, we achieved broad temperature window NOx reduction by ingeniously utilizing a tandem catalyst system composed of V2O5-WO3/TiO2 and 2Br-NiCoMoOx, with the optimal mass ratio of the two phases being 1:3. This research presents novel design approaches that offer a new approach to the creation of high-performance SCR catalysts.
{"title":"Series of halogen engineered well-mixed oxides derived from layered double hydroxides for highly efficient NH3-SCR catalysts: Improvement of the oxygen vacancies","authors":"Yu Zhang, Rui Wang","doi":"10.1016/j.seppur.2025.131775","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131775","url":null,"abstract":"Reinforcing the development of efficient catalysts is crucial for addressing the challenges associated with NO<sub>x</sub> removal technologies. Herein, we present a unique method for the in situ production of halogen-doped NiCoMoO<sub>x</sub> catalysts utilizing a crystallization-thermal decomposition mechanism and the use of such catalysts for the selective catalytic reduction of NO<sub>x</sub> with NH<sub>3</sub> (NH<sub>3</sub>-SCR). The formation of lattice defect (oxygen vacancies) and surface acid sites on Br-doped NiCoMoO<sub>x</sub> catalyst was considerably enhanced compared with that on pure NiCoMoO<sub>x</sub>, resulting in highly efficient reduction of NO<sub>x</sub> and a broader temperature operating range. The 2Br-NiCoMoO<sub>x</sub> catalyst achieved the highest NO<sub>x</sub> conversion of 97.2 % at 250°C, while NiCoMoO<sub>x</sub> was only 83 %, and the NO<sub>x</sub> conversion was always above 80 % in a wide temperature window of 200 to 350 °C. Through comprehensive characterization, it was also revealed that the introduction of Br enhanced the low temperature redox performance and the adsorption and activation of NO and NH<sub>3</sub> on the catalyst surface, which played a crucial role in facilitating the reaction between NO and NH<sub>3</sub>. Furthermore, we achieved broad temperature window NO<sub>x</sub> reduction by ingeniously utilizing a tandem catalyst system composed of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> and 2Br-NiCoMoO<sub>x</sub>, with the optimal mass ratio of the two phases being 1:3. This research presents novel design approaches that offer a new approach to the creation of high-performance SCR catalysts.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"22 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020876","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131764
Xin He, Zhongxin Zhong, Yixuan Ouyang, Jianbo Wang
With the global dramatic increase in e-waste, recycling thermoplastics in e-waste through tribo-electrostatic separation has become essential. In this study, the internal and external functional group distribution of four typical thermoplastics including polyvinyl chloride (PVC), high impact polystyrene (HIPS), polypropylene (PP) and acrylonitrile–butadiene–styrene (ABS) were analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). A certain degree of oxidation, mainly exhibited as –OH, existed in all thermoplastics. For the first time, atomic force microscopy (AFM) was employed to assess surface potentials of thermoplastics, and their total electronegativity was calculated by integrating the content and electronegativity of various functional groups. The order of surface potential and total electronegativity in four thermoplastics is consistent: PVC (−4.08 V, 2.74) > HIPS (−8.36 V, 2.59) > PP (−9.18 V, 2.57) > ABS (−11.30 V, 2.56). Both content and electronegativity of functional groups in thermoplastics significantly influence surface potential levels. The variations in volume resistivity and relative dielectric constant (RDC) of thermoplastics under different environmental conditions suggested that low relative humidity and low temperature (particularly lower temperature) are more conducive to separation. Effective separation and recycling of binary mixed thermoplastics could be accomplished via tribo-electrostatic method. Thermoplastics with higher surface potential are more inclined to gain electrons and negatively charged, finally enriched in positive electrode. The greater the surface potential difference between two thermoplastics, the higher purity of their separation products. For instance, both positive and negative product purities of the ABS-PVC exceeded 97 % (surface potential difference of 7.22 V).
{"title":"Investigation of tribo-electrostatic separation mechanism for thermoplastics in e-waste based on functional group distribution and surface potential","authors":"Xin He, Zhongxin Zhong, Yixuan Ouyang, Jianbo Wang","doi":"10.1016/j.seppur.2025.131764","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131764","url":null,"abstract":"With the global dramatic increase in e-waste, recycling thermoplastics in e-waste through tribo-electrostatic separation has become essential. In this study, the internal and external functional group distribution of four typical thermoplastics including polyvinyl chloride (PVC), high impact polystyrene (HIPS), polypropylene (PP) and acrylonitrile–butadiene–styrene (ABS) were analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). A certain degree of oxidation, mainly exhibited as –OH, existed in all thermoplastics. For the first time, atomic force microscopy (AFM) was employed to assess surface potentials of thermoplastics, and their total electronegativity was calculated by integrating the content and electronegativity of various functional groups. The order of surface potential and total electronegativity in four thermoplastics is consistent: PVC (−4.08 V, 2.74) > HIPS (−8.36 V, 2.59) > PP (−9.18 V, 2.57) > ABS (−11.30 V, 2.56). Both content and electronegativity of functional groups in thermoplastics significantly influence surface potential levels. The variations in volume resistivity and relative dielectric constant (RDC) of thermoplastics under different environmental conditions suggested that low relative humidity and low temperature (particularly lower temperature) are more conducive to separation. Effective separation and recycling of binary mixed thermoplastics could be accomplished via tribo-electrostatic method. Thermoplastics with higher surface potential are more inclined to gain electrons and negatively charged, finally enriched in positive electrode. The greater the surface potential difference between two thermoplastics, the higher purity of their separation products. For instance, both positive and negative product purities of the ABS-PVC exceeded 97 % (surface potential difference of 7.22 V).","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"38 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020895","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131779
Yonghai Gan, Le Qu, Zihao Cang, Xinhe Ding, Jun Luo, Zhe Li, Zheng Wang, Chengcheng Ding, Yibin Cui, Bin Xu, Bingdang Wu
Arsenic-fluoride (As-F) co-existence pollution seriously threatened the drinking water safety of residents using groundwater as water sources. At present, coagulation technology was widely used in the removal of arsenic and fluoride due to its economic efficiency and simple operation. While traditional aluminum (Al) and iron (Fe) coagulants could not remove fluoride and As(III) simultaneously, and high metal residues would bring additional risks. Based on the hydrolysis properties and pollution removal performance of zirconium (Zr) and titanium (Ti) salts, here we developed a new bimetallic composite xerogel coagulant (ZTXC) for simultaneous deep purification of fluoride and As(III). The characterization of physicochemical properties showed that ZTXC was a high-polymerization amorphous hydroxide similar to titanium xerogel coagulant (TXC) and zirconium xerogel coagulant (ZXC). ZTXC with a Zr/Ti molar ratio of 4:1 could effectively purify fluoride and As(III) at the same time, reducing fluoride and As(III) to 0.45 mg/L and 9.07 μg/L at pH 5.0 with dosage of 0.4 mM, respectively. Combining the advantages of Zr and Ti salts, ZTXC showed better coagulation performance and lower metal residues than PAC and PFS. Through the analysis of hydrolysis precipitation species and charge differences, fluoride removal mainly relied on the electrostatic attraction by positively charged hydrolysates, while neutral As(III) was mainly removed through hydroxyl coordination. This study could provide reference and theoretical guidance for the development and application of materials and technologies for As-F co-contaminated drinking water treatment.
{"title":"Simultaneous deep purification of fluoride and trivalent arsenic by a bimetallic composite xerogel coagulant","authors":"Yonghai Gan, Le Qu, Zihao Cang, Xinhe Ding, Jun Luo, Zhe Li, Zheng Wang, Chengcheng Ding, Yibin Cui, Bin Xu, Bingdang Wu","doi":"10.1016/j.seppur.2025.131779","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131779","url":null,"abstract":"Arsenic-fluoride (As-F) co-existence pollution seriously threatened the drinking water safety of residents using groundwater as water sources. At present, coagulation technology was widely used in the removal of arsenic and fluoride due to its economic efficiency and simple operation. While traditional aluminum (Al) and iron (Fe) coagulants could not remove fluoride and As(III) simultaneously, and high metal residues would bring additional risks. Based on the hydrolysis properties and pollution removal performance of zirconium (Zr) and titanium (Ti) salts, here we developed a new bimetallic composite xerogel coagulant (ZTXC) for simultaneous deep purification of fluoride and As(III). The characterization of physicochemical properties showed that ZTXC was a high-polymerization amorphous hydroxide similar to titanium xerogel coagulant (TXC) and zirconium xerogel coagulant (ZXC). ZTXC with a Zr/Ti molar ratio of 4:1 could effectively purify fluoride and As(III) at the same time, reducing fluoride and As(III) to 0.45 mg/L and 9.07 μg/L at pH 5.0 with dosage of 0.4 mM, respectively. Combining the advantages of Zr and Ti salts, ZTXC showed better coagulation performance and lower metal residues than PAC and PFS. Through the analysis of hydrolysis precipitation species and charge differences, fluoride removal mainly relied on the electrostatic attraction by positively charged hydrolysates, while neutral As(III) was mainly removed through hydroxyl coordination. This study could provide reference and theoretical guidance for the development and application of materials and technologies for As-F co-contaminated drinking water treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"20 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020875","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}
The comprehensive recovery of spent lithium iron phosphate powder (LFP/C) remains challenging in industry due to the difficulty in impurity removal. Specifically, the impact of fluorine impurity on the recovery process is unclear. In this work, the specific effects of fluorine on the removal of aluminum impurities and the subsequent recovery of FePO4·2H2O from spent LFP/C were investigated, and an acid-assisted pyrolysis process was proposed to transfer fluorine species into the gas phase for fluorine removal. The results indicate that due to the coordination reactions between F- with Al3+ and Fe2+/Fe3+, the presence of F- in increased the difficulty of aluminum removal and reduced the precipitation efficiency of FePO4·2H2O. Additionally, F- accelerated the aging of LFP/C cathode materials, increasing resistance to lithium-ion migration, which ultimately resulted in an irreversible decline in electrochemical performance. The acid-assisted pyrolysis process achieved a fluorine removal rate of approximately 98 % under the optimal condition (pyrolysis temperature 600-700°C, reaction time 4.0h, H3PO4 dosage 1.2 times of theoretic amount, and solid/liquid ratio 4.0), reducing the fluorine content from 1.69 wt% to 0.05 wt%. This work presents a potential strategy for fluorine removal, contributing to the comprehensive recovery of valuable elements from spent LFP/C.
{"title":"Impact and removal of fluorine impurity in the comprehensive recovery of spent LiFePO4/C","authors":"Yang Jiang, Changhong Peng, Kanggen Zhou, Hao Zhou, Tangmiaoqin Chen, Guopeng Zhang, Wei Chen","doi":"10.1016/j.seppur.2025.131766","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131766","url":null,"abstract":"The comprehensive recovery of spent lithium iron phosphate powder (LFP/C) remains challenging in industry due to the difficulty in impurity removal. Specifically, the impact of fluorine impurity on the recovery process is unclear. In this work, the specific effects of fluorine on the removal of aluminum impurities and the subsequent recovery of FePO<sub>4</sub>·2H<sub>2</sub>O from spent LFP/C were investigated, and an acid-assisted pyrolysis process was proposed to transfer fluorine species into the gas phase for fluorine removal. The results indicate that due to the coordination reactions between F<sup>-</sup> with Al<sup>3+</sup> and Fe<sup>2+</sup>/Fe<sup>3+</sup>, the presence of F<sup>-</sup> in increased the difficulty of aluminum removal and reduced the precipitation efficiency of FePO<sub>4</sub>·2H<sub>2</sub>O. Additionally, F<sup>-</sup> accelerated the aging of LFP/C cathode materials, increasing resistance to lithium-ion migration, which ultimately resulted in an irreversible decline in electrochemical performance. The acid-assisted pyrolysis process achieved a fluorine removal rate of approximately 98 % under the optimal condition (pyrolysis temperature 600-700°C, reaction time 4.0h, H<sub>3</sub>PO<sub>4</sub> dosage 1.2 times of theoretic amount, and solid/liquid ratio 4.0), reducing the fluorine content from 1.69 wt% to 0.05 wt%. This work presents a potential strategy for fluorine removal, contributing to the comprehensive recovery of valuable elements from spent LFP/C.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"51 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020963","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131777
Lin Liu, Songsong Zhi, Runan Chen, Yang Yang, Chenshi Luo, Pengfei Liang, Yongli Liu, Guifen Zhu
Photocatalytic degradation is an effective technology for the removal of organic compounds. However, the lack of selectivity limits its practical application for harmful substances in complex systems. Herein, a novel molecularly imprinted photocatalyst (MI-BiOCl) was prepared using two-dimensional nanosheet BiOCl as a matrix. Based on the superior degradation activity and charge carrier transfer of BiOCl, along with an imprinting layer with selectivity, MI-BiOCl can selectively adsorb and rapidly and sequentially degrade venlafaxine (VEN) and its analogue fluoxetine (FLU) in mixtures. MI-BiOCl can adsorb 32.27 mg/g of VEN within 5 min, with an imprinting factor of 4.72. Within pH range of 3–9, the degradation efficiency of VEN by MI-BiOCl remained above 98.8 %, unaffected by coexisting humic acid, and after four cycles, it was still higher than 98 %. Moreover, over 88.8 % of VEN and 99.3 % of FLU in municipal wastewater were degraded by MI-BiOCl, and the degradation intermediates tended to be non-toxic. DFT simulations verified that the highly selective degradation was due to the synergistic effect of imprinting sites, catalytic active sites and non-covalent bonding forces including van der Waals, hydrogen bonding and electrostatic interaction between MI-BiOCl and VEN and FLU. FLU, with stronger binding affinity, has the advantage of being preferentially degraded. The strategy provides a method for the highly selective degradation of drug pollutants in complex media.
{"title":"Highly selective and rapid sequential degradation of venlafaxine-class antidepressants using a novel BiOCl-based two-dimensional molecularly imprinted photocatalyst","authors":"Lin Liu, Songsong Zhi, Runan Chen, Yang Yang, Chenshi Luo, Pengfei Liang, Yongli Liu, Guifen Zhu","doi":"10.1016/j.seppur.2025.131777","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131777","url":null,"abstract":"Photocatalytic degradation is an effective technology for the removal of organic compounds. However, the lack of selectivity limits its practical application for harmful substances in complex systems. Herein, a novel molecularly imprinted photocatalyst (MI-BiOCl) was prepared using two-dimensional nanosheet BiOCl as a matrix. Based on the superior degradation activity and charge carrier transfer of BiOCl, along with an imprinting layer with selectivity, MI-BiOCl can selectively adsorb and rapidly and sequentially degrade venlafaxine (VEN) and its analogue fluoxetine (FLU) in mixtures. MI-BiOCl can adsorb 32.27 mg/g of VEN within 5 min, with an imprinting factor of 4.72. Within pH range of 3–9, the degradation efficiency of VEN by MI-BiOCl remained above 98.8 %, unaffected by coexisting humic acid, and after four cycles, it was still higher than 98 %. Moreover, over 88.8 % of VEN and 99.3 % of FLU in municipal wastewater were degraded by MI-BiOCl, and the degradation intermediates tended to be non-toxic. DFT simulations verified that the highly selective degradation was due to the synergistic effect of imprinting sites, catalytic active sites and non-covalent bonding forces including van der Waals, hydrogen bonding and electrostatic interaction between MI-BiOCl and VEN and FLU. FLU, with stronger binding affinity, has the advantage of being preferentially degraded. The strategy provides a method for the highly selective degradation of drug pollutants in complex media.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"54 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020873","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131771
Jiangnan Huang, Jiali Huang, Xugang Shu, Xingan Cheng, Hao Yu, Yonghai Cao, Zhuofeng Hu, Jimmy C. Yu
Ocean acidification from the uptake of CO2 and antibiotic pollution from a consequence of inshore mariculture are two serious threats to marine ecosystems. In this work, a novelty oxygen-doping carbon nitride (O-CN) photocatalyst are designed for the release of CO2 and degradation of a targeted antibiotic (ofloxacin, OFL) in acidified seawater. Notably, this photocatalytic system can take advantage of ocean acidification as more CO3•- radicals were produced in the seawater. The catalyst could degrade OFL rapidly (k = 0.039 min−1) in the presence of CO32– and HCO3–, which derive from the dissolved CO2 in the seawater, much higher than that of pristine CN (k = 0.013 min−1). Mechanism study revealed that the existence of CO32– and HCO3– would facilitate the generation of new N-C-O (O1) groups on the O-CN surface. These O1 groups are the active sites for the formation of •OH radicals that can oxidize OFL and release CO2. This investigation offers a novel strategy for alleviating two environmental threats simultaneously.
{"title":"A photocatalytic system for the Alleviation of ocean acidification and antibiotic pollution","authors":"Jiangnan Huang, Jiali Huang, Xugang Shu, Xingan Cheng, Hao Yu, Yonghai Cao, Zhuofeng Hu, Jimmy C. Yu","doi":"10.1016/j.seppur.2025.131771","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131771","url":null,"abstract":"Ocean acidification from the uptake of CO<sub>2</sub> and antibiotic pollution from a consequence of inshore mariculture are two serious threats to marine ecosystems. In this work, a novelty oxygen-doping carbon nitride (O-CN) photocatalyst are designed for the release of CO<sub>2</sub> and degradation of a targeted antibiotic (ofloxacin, OFL) in acidified seawater. Notably, this photocatalytic system can take advantage of ocean acidification as more CO<sub>3</sub><sup>•-</sup> radicals were produced in the seawater. The catalyst could degrade OFL rapidly (<em>k</em> = 0.039 min<sup>−1</sup>) in the presence of CO<sub>3</sub><sup>2–</sup> and HCO<sub>3</sub><sup>–</sup>, which derive from the dissolved CO<sub>2</sub> in the seawater, much higher than that of pristine CN (<em>k</em> = 0.013 min<sup>−1</sup>). Mechanism study revealed that the existence of CO<sub>3</sub><sup>2–</sup> and HCO<sub>3</sub><sup>–</sup> would facilitate the generation of new N-C-O (O1) groups on the O-CN surface. These O1 groups are the active sites for the formation of •OH radicals that can oxidize OFL and release CO<sub>2</sub>. This investigation offers a novel strategy for alleviating two environmental threats simultaneously.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"33 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020877","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131772
Haoran Sun, Jie Zhong, Hengxu Guo, Yipu Xu, Ziyang Liu, Anmin Zheng, Peng Peng, Zifeng Yan
It is of vital importance to selectively adsorb volatile organic compounds (VOC) via zeolite in order to alleviate their threats to both the public health and environment. However, practical VOC removal processes are often conducted under humid conditions where competitive water adsorption is always unavoidable. In this study, a Fe-containing MFI zeolite sample with less water affinity was prepared via an impregnation method with the help of tetrasodium iminodisuccinate (IDS) as a ligand. The breakthrough analysis of the Fe-containing MFI zeolite using toluene as a model compound for VOC showed that it has a significant increase in toluene adsorption selectivity under humid conditions compared to its high water affinity counterparts. Various characterization techniques confirmed that the iron species can heal the silanol nests related defects within Si-MFI zeolite by embedding into the framework via forming Fe-O-Si interaction.
{"title":"Enhanced toluene adsorption selectivity of Fe-MFI zeolite under humid conditions using tetrasodium iminodisuccinate as ligand","authors":"Haoran Sun, Jie Zhong, Hengxu Guo, Yipu Xu, Ziyang Liu, Anmin Zheng, Peng Peng, Zifeng Yan","doi":"10.1016/j.seppur.2025.131772","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131772","url":null,"abstract":"It is of vital importance to selectively adsorb volatile organic compounds (VOC) via zeolite in order to alleviate their threats to both the public health and environment. However, practical VOC removal processes are often conducted under humid conditions where competitive water adsorption is always unavoidable. In this study, a Fe-containing MFI zeolite sample with less water affinity was prepared via an impregnation method with the help of tetrasodium iminodisuccinate (IDS) as a ligand. The breakthrough analysis of the Fe-containing MFI zeolite using toluene as a model compound for VOC showed that it has a significant increase in toluene adsorption selectivity under humid conditions compared to its high water affinity counterparts. Various characterization techniques confirmed that the iron species can heal the silanol nests related defects within Si-MFI zeolite by embedding into the framework via forming Fe-O-Si interaction.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"28 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020874","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 : 2025-01-23DOI: 10.1016/j.seppur.2025.131786
Kai-hua Zhang, Ru-Yue Ding, Xin-Jie Zhao, Xiao-jing Wang, Yu-pei Li, Jun Zhao, Fa-tang Li
Sustained photocatalytic hydrogenation of CO2 molecules is crucial for the CO2 methanation reaction. Synchronizing directional photogenerated charge carriers and regulating the activation and hydrogenation process of CO2 molecules are key to achieving the efficient photocatalytic methanation of CO2. Herein, Ag–Bi bimetallic sites were designed and anchored on the surface of TiO2 via a one-step solution impregnation reduction and applied for the photocatalytic conversion of CO2 to CH4. The optimum 5 %Ag90Bi10-TiO2 composite exhibited excellent photocatalytic performance for the photoreduction of CO2 into CH4. The product selectivity of CH4 reached up to 97.2 %, at a rate of 58.9 μmol·g−1·h−1. In situ Kelvin probe force microscopy and diffuse reflectance infrared Fourier transform spectroscopy attributed the high selectivity of CH4 to the coexistence of metallic Ag and Bi sites, which induced directional photogenerated electrons and hole transfer. Moreover, the synergistic function of Ag–Bi bimetallic active sites on TiO2 facilitated the hydrogenation of *CO2– to CH4. The proposed strategy provides insight into the design of highly selective photocatalysts for the reaction of photocatalytic methanation of CO2.
{"title":"Synchronizing directional photogenerated electrons and holes through Ag and Bi bimetallic modification toward sustained hydrogenation process in CO2 methanation reaction","authors":"Kai-hua Zhang, Ru-Yue Ding, Xin-Jie Zhao, Xiao-jing Wang, Yu-pei Li, Jun Zhao, Fa-tang Li","doi":"10.1016/j.seppur.2025.131786","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131786","url":null,"abstract":"Sustained photocatalytic hydrogenation of CO<sub>2</sub> molecules is crucial for the CO<sub>2</sub> methanation reaction. Synchronizing directional photogenerated charge carriers and regulating the activation and hydrogenation process of CO<sub>2</sub> molecules are key to achieving the efficient photocatalytic methanation of CO<sub>2</sub>. Herein, Ag–Bi bimetallic sites were designed and anchored on the surface of TiO<sub>2</sub> via a one-step solution impregnation reduction and applied for the photocatalytic conversion of CO<sub>2</sub> to CH<sub>4</sub>. The optimum 5 %Ag<sub>90</sub>Bi<sub>10</sub>-TiO<sub>2</sub> composite exhibited excellent photocatalytic performance for the photoreduction of CO<sub>2</sub> into CH<sub>4</sub>. The product selectivity of CH<sub>4</sub> reached up to 97.2 %, at a rate of 58.9 μmol·g<sup>−1</sup>·h<sup>−1</sup>. In situ Kelvin probe force microscopy and diffuse reflectance infrared Fourier transform spectroscopy attributed the high selectivity of CH<sub>4</sub> to the coexistence of metallic Ag and Bi sites, which induced directional photogenerated electrons and hole transfer. Moreover, the synergistic function of Ag–Bi bimetallic active sites on TiO<sub>2</sub> facilitated the hydrogenation of *CO<sub>2</sub><sup>–</sup> to CH<sub>4</sub>. The proposed strategy provides insight into the design of highly selective photocatalysts for the reaction of photocatalytic methanation of CO<sub>2</sub>.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"13 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020897","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}
Developing new adsorbents and studying their adsorption mechanisms can greatly assist in addressing environmental pollution issues. Herein, the maltodextrin-based nanosponges (MD-SPs) were facilely synthesized by esterification reaction at room temperature. The porous features, nanostructure, and swelling capacities of the resulting MD-SPs can be regulated by altering the crosslinking agent, which controls the adsorption properties. Using nine cationic dyes as model adsorbates, the results showed that MD-SPs could adsorb a large amount of cationic dyes in a short time. Especially, MD-SP-1 could rapidly adsorb over 90 % of most cationic dyes within 3 min, and the maximal adsorption quantity (Qm) of cationic red X-GRL (CRX) was as high as 2137.81 mg/g. The adsorption behaviors were meticulously investigated by multiple adsorption kinetic and thermodynamic models. Furthermore, the integrated analysis of experimental and theoretical calculations results demonstrated that the electrostatic force, hydrogen bonding, hydrophobic interaction, cation-π interaction, and π-π stacking may collectively facilitate the capture of dye molecules. Notably, the absorbent offered excellent anti-interference capabilities, high stability, and reusability, making it an ideal adsorbent for the rapid and batch treatment of dye wastewater. These discoveries may provide valuable references for the theoretical and practical study of adsorbents and offer new insights into the development of advanced maltodextrin-based adsorbents.
{"title":"Efficient and convenient purification strategy using maltodextrin-based nanosponges for rapid removal of cationic dyes","authors":"Chaochao Wen, Yu Huang, Wenjia Zhang, Jiping Tian, Chuan Dong, Cheng Yang, Wenting Liang","doi":"10.1016/j.seppur.2025.131702","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131702","url":null,"abstract":"Developing new adsorbents and studying their adsorption mechanisms can greatly assist in addressing environmental pollution issues. Herein, the maltodextrin-based nanosponges (MD-SPs) were facilely synthesized by esterification reaction at room temperature. The porous features, nanostructure, and swelling capacities of the resulting MD-SPs can be regulated by altering the crosslinking agent, which controls the adsorption properties. Using nine cationic dyes as model adsorbates, the results showed that MD-SPs could adsorb a large amount of cationic dyes in a short time. Especially, MD-SP-1 could rapidly adsorb over 90 % of most cationic dyes within 3 min, and the maximal adsorption quantity (Q<sub>m</sub>) of cationic red X-GRL (CRX) was as high as 2137.81 mg/g. The adsorption behaviors were meticulously investigated by multiple adsorption kinetic and thermodynamic models. Furthermore, the integrated analysis of experimental and theoretical calculations results demonstrated that the electrostatic force, hydrogen bonding, hydrophobic interaction, cation-π interaction, and π-π stacking may collectively facilitate the capture of dye molecules. Notably, the absorbent offered excellent anti-interference capabilities, high stability, and reusability, making it an ideal adsorbent for the rapid and batch treatment of dye wastewater. These discoveries may provide valuable references for the theoretical and practical study of adsorbents and offer new insights into the development of advanced maltodextrin-based adsorbents.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"12 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020958","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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