Organic polymer flocculants as the typical chemicals are widely applied in wastewater treatment. The efficient initiation method will increase the synthesis efficiency of organic polymer flocculants and reduce their synthesis cost. Herein, a novel synergistic initiation system of modified-titanium dioxide (modified-TiO2) and potassium persulfate (K2S2O8) was applied to prepare a cationic organic polymer flocculants, VLIF, under visible light. The initiation mechanisms of VLIF were investigated via molecular dynamics simulation, experiments and characterization. The results indicated that there were synergies of modified-TiO2 and K2S2O8 during the initiation. Modified-TiO2 was firstly excited and generated active radicals and electron-hole pairs. Photogenerated electrons reduced K2S2O8. K2S2O8 was subsequently excited and simultaneously facilitated the generation of free radicals of modified-TiO2. The prepared VLIF possessed the excellent physical and chemical properties. It performed well in the treatment of wastewater containing tetracycline, colloidal particles and natural organic matters. The highest removal rate of tetracycline was 76.85% achieved by VLIF. The strong interaction between VLIF and tetracycline, micelles formed by sodium dodecyl sulfate (SDS) and tetracycline, bridging and adsorption all contributed to tetracycline removal from wastewater.
{"title":"Synthesis of visible light induced-flocculants via synergetic initiation of modified-titanium dioxide and potassium persulfate and their flocculation performances in the treatment of tetracycline","authors":"Jingxin Li, Jing Huang, Xiaomin Tang, Shixin Zhang, Hailin Yang, Xiaoxia Bai, Huaili Zheng","doi":"10.1016/j.cej.2025.160026","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160026","url":null,"abstract":"Organic polymer flocculants as the typical chemicals are widely applied in wastewater treatment. The efficient initiation method will increase the synthesis efficiency of organic polymer flocculants and reduce their synthesis cost. Herein, a novel synergistic initiation system of modified-titanium dioxide (modified-TiO<sub>2</sub>) and potassium persulfate (K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>) was applied to prepare a cationic organic polymer flocculants, VLIF, under visible light. The initiation mechanisms of VLIF were investigated via molecular dynamics simulation, experiments and characterization. The results indicated that there were synergies of modified-TiO<sub>2</sub> and K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> during the initiation. Modified-TiO<sub>2</sub> was firstly excited and generated active radicals and electron-hole pairs. Photogenerated electrons reduced K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> was subsequently excited and simultaneously facilitated the generation of free radicals of modified-TiO<sub>2</sub>. The prepared VLIF possessed the excellent physical and chemical properties. It performed well in the treatment of wastewater containing tetracycline, colloidal particles and natural organic matters. The highest removal rate of tetracycline was 76.85% achieved by VLIF. The strong interaction between VLIF and tetracycline, micelles formed by sodium dodecyl sulfate (SDS) and tetracycline, bridging and adsorption all contributed to tetracycline removal from wastewater.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"206 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055213","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 integrated thiosulfate-based autotrophic partial denitrification-anaerobic ammonium oxidation (anammox) (TS-AuPD/A) system achieved effective removal of ammonium and nitrate in a continuous reactor. The reactor (R1) containing only activated sludge achieved a total nitrogen removal efficiency (TNRE) of 81.8 ± 1.1 % and a nitrite removal efficiency (NiRE) of 90.2 ± 3.7 % over 96 days, while the reactor (R2) with mixed anammox biomass demonstrated accelerated nitrate removal, reaching 83.0 ± 2.2 % TNRE and 90.8 ± 4.3 % NiRE within just 33 days. These results suggest that anammox activity selectively benefits denitratation in the denitrifying pathway. The next-generation sequencing verified that Candidatus Brocadia sapporoensis and the denitrifying Denitratisoma oestradiolicum have a mutually beneficial relationship in TS-AuPD/A. Batch tests specifically were designed to elucidate the bacterial communication for efficient nitrogen removal in TS-AuPD/A. The quorum sensing in bacterial communities was responsible for this function. N-acyl-homoserine lactones biosynthesized by anammox, C8-HSL, played a significant mediating role in nitrite and nitrate reduction, enhancing the symbiotic interaction within the TS-AuPD/A system. These findings highlight the critical interplay between TS-AuPD and anammox, mediated by AHL signaling molecules in the TS-AuPD/A systems for enhanced and stable nitrogen removal in wastewater treatment.
{"title":"Insights into thiosulfate-driven partial denitrification synergistically mediated by anaerobic ammonium oxidation: Biosynthesized signaling molecules and enzymatic collaboration","authors":"Daehee Choi, Wonsang Yun, Yunjung Choi, Jinyoung Jung, Suin Park, Dongjin Ju, Hyokwan Bae","doi":"10.1016/j.cej.2025.160069","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160069","url":null,"abstract":"The integrated thiosulfate-based autotrophic partial denitrification-anaerobic ammonium oxidation (anammox) (TS-AuPD/A) system achieved effective removal of ammonium and nitrate in a continuous reactor. The reactor (R1) containing only activated sludge achieved a total nitrogen removal efficiency (TNRE) of 81.8 ± 1.1 % and a nitrite removal efficiency (NiRE) of 90.2 ± 3.7 % over 96 days, while the reactor (R2) with mixed anammox biomass demonstrated accelerated nitrate removal, reaching 83.0 ± 2.2 % TNRE and 90.8 ± 4.3 % NiRE within just 33 days. These results suggest that anammox activity selectively benefits denitratation in the denitrifying pathway. The next-generation sequencing verified that <em>Candidatus Brocadia sapporoensis</em> and the denitrifying <em>Denitratisoma oestradiolicum</em> have a mutually beneficial relationship in TS-AuPD/A. Batch tests specifically were designed to elucidate the bacterial communication for efficient nitrogen removal in TS-AuPD/A. The quorum sensing in bacterial communities was responsible for this function. N-acyl-homoserine lactones biosynthesized by anammox, C8-HSL, played a significant mediating role in nitrite and nitrate reduction, enhancing the symbiotic interaction within the TS-AuPD/A system. These findings highlight the critical interplay between TS-AuPD and anammox, mediated by AHL signaling molecules in the TS-AuPD/A systems for enhanced and stable nitrogen removal in wastewater treatment.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"25 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055214","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}
Copper-based catalysts exhibit an excellent ability in producing C2 chemicals during CO2RR. However, the unsustainable Faradic efficiency (FE) resulting from the reconstruction makes keeping catalyst behavior challengeable. In this study, we synthesized CuO nanosheets and incorporated a small amount of nickel on surface to improve the stability of nanosheets. By inhibiting the dissolution of Cu through the incorporation of Ni, our CuO + Ni-surface catalyst could achieve a double increase in stability compared to CuO nanosheets. Using a combination of electrochemistry, density functional theory calculations, in situ UV–vis spectrometer and inductively coupled plasma optical emission spectrometry, we elucidate the mechanisms behind the increased stability. The incorporation of Ni reduces the tendency of Cu oxidation at higher overpotential and strengthens the bonds between surface and subsurface Cu atoms. This work highlights a promising approach to enhance the stability and efficiency of copper-based catalysts in CO2RR, proposing the way for more sustainable catalytic processes.
{"title":"Stabilizing Cu-based catalyst for electrochemical CO2 reduction using incorporated Ni","authors":"Minglu Li, Siyu Kuang, Yaxin Jin, Haoyuan Chi, Sheng Zhang, Xinbin Ma","doi":"10.1016/j.cej.2025.160048","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160048","url":null,"abstract":"Copper-based catalysts exhibit an excellent ability in producing C<sub>2</sub> chemicals during CO<sub>2</sub>RR. However, the unsustainable Faradic efficiency (FE) resulting from the reconstruction makes keeping catalyst behavior challengeable. In this study, we synthesized CuO nanosheets and incorporated a small amount of nickel on surface to improve the stability of nanosheets. By inhibiting the dissolution of Cu through the incorporation of Ni, our CuO + Ni-surface catalyst could achieve a double increase in stability compared to CuO nanosheets. Using a combination of electrochemistry, density functional theory calculations, in situ UV–vis spectrometer and inductively coupled plasma optical emission spectrometry, we elucidate the mechanisms behind the increased stability. The incorporation of Ni reduces the tendency of Cu oxidation at higher overpotential and strengthens the bonds between surface and subsurface Cu atoms. This work highlights a promising approach to enhance the stability and efficiency of copper-based catalysts in CO<sub>2</sub>RR, proposing the way for more sustainable catalytic processes.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"45 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055217","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}
This work proposes a novel single atom solution (SAS) for carbon capture and methanation. It investigates the performance of SAS in CO2 capture and utilization process through experimental and simulation methods. Detailed calculations are conducted on the physical properties of the SAS, and the optimal ratio of SAS is selected for absorption and desorption experiments. Based on physical properties and experimental research, a process model for SAS capture and methanation is established by Aspen Plus. The results showed that the activation energy of the SAS desorption reaction became 55.5 kJ/mol, with a reduction of 30.8 % compared to 30 wt%MEA. The optimal reboiler heat load of the SAS desorption process was 2.24 GJ/t CO2, with a decrease of 40.3 % compared to 30 wt% MEA. The CO2 equivalent emission of the SAS capture and methanation process was −1.473tCO2/t-pro. The successful application of the SAS in CO2 capture and utilization is of great significance for carbon neutrality.
{"title":"Process optimization study on single atom solutions for CO2 capture and methanation based on experiment and simulation","authors":"Yuan Li, Jingfeng Zhang, Yunsong Yu, Zaoxiao Zhang","doi":"10.1016/j.cej.2025.160064","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160064","url":null,"abstract":"This work proposes a novel single atom solution (SAS) for carbon capture and methanation. It investigates the performance of SAS in CO<sub>2</sub> capture and utilization process through experimental and simulation methods. Detailed calculations are conducted on the physical properties of the SAS, and the optimal ratio of SAS is selected for absorption and desorption experiments. Based on physical properties and experimental research, a process model for SAS capture and methanation is established by Aspen Plus. The results showed that the activation energy of the SAS desorption reaction became 55.5 kJ/mol, with a reduction of 30.8 % compared to 30 wt%MEA. The optimal reboiler heat load of the SAS desorption process was 2.24 GJ/t CO<sub>2</sub>, with a decrease of 40.3 % compared to 30 wt% MEA. The CO<sub>2</sub> equivalent emission of the SAS capture and methanation process was −1.473tCO<sub>2</sub>/t-pro. The successful application of the SAS in CO<sub>2</sub> capture and utilization is of great significance for carbon neutrality.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"21 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055289","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 : 2025-01-28DOI: 10.1016/j.cej.2025.159994
Jingang Wang, Yu Liu, Xuejiao Tang, Yanmei Sun, Fei Li
The decomposition of toxic phosphine (PH3) gas into elemental phosphorus is a high value-added way of resource recovery and pollution control for phosphorus containing substances derived from the discharge of domestic sewage, industrial wastewater and exhaust gas. In this paper, the photocatalysis method was firstly introduced to decompose PH3 of 1.0 v/v%. The halloysite nanotubes co-doped by Ni and Fe3O4 (Fe3O4-Ni@HNTs-NH2) was innovatively prepared via electroless plating-precipitation method and further used as the photocatalyst for PH3 decomposition, and it was found that the photoinitiation by 395 nm light (L-395) significantly improved the decomposition efficiency of PH3 with Fe3O4-Ni@HNTs-NH2, which was much higher than that by 365 nm light. The results of the absorption coefficient analysis, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra indicated that the lower bandgap of Fe3O4 contributed to the absorption of L-395 and formation of oxygen vacancy, thereby promoting photoelectron migration, activating and breaking PH bonds in PH3. The reaction mechanism was studied using first principles theory calculations. It is verified that there is a synergistic catalytic effect between Ni and Fe3O4, and Fe3O4 plays a major role in the photocatalysis, while the bonding orbitals of the Ni site having lower energies exhibit a better non-photocatalytic performance than Fe3O4. The catalytic decomposition mechanisms of PH3 on Fe3O4-Ni@HNTs-NH2 in photocatalytic and non-photocatalytic ways have been proposed. The halloysite nanotubes co-doped by Ni and Fe3O4 is an efficient and environment-friendly catalyst for both abatement and utilization of industrial waste PH3 gas.
{"title":"Photocatalytic decomposition of toxic phosphine gas over halloysite nanotubes co-doped by Ni and Fe3O4 and theory calculation of its mechanism","authors":"Jingang Wang, Yu Liu, Xuejiao Tang, Yanmei Sun, Fei Li","doi":"10.1016/j.cej.2025.159994","DOIUrl":"https://doi.org/10.1016/j.cej.2025.159994","url":null,"abstract":"The decomposition of toxic phosphine (PH<sub>3</sub>) gas into elemental phosphorus is a high value-added way of resource recovery and pollution control for phosphorus containing substances derived from the discharge of domestic sewage, industrial wastewater and exhaust gas. In this paper, the photocatalysis method was firstly introduced to decompose PH<sub>3</sub> of 1.0 v/v%. The halloysite nanotubes co-doped by Ni and Fe<sub>3</sub>O<sub>4</sub> (Fe<sub>3</sub>O<sub>4</sub>-Ni@HNTs-NH<sub>2</sub>) was innovatively prepared via electroless plating-precipitation method and further used as the photocatalyst for PH<sub>3</sub> decomposition, and it was found that the photoinitiation by 395 nm light (L-395) significantly improved the decomposition efficiency of PH<sub>3</sub> with Fe<sub>3</sub>O<sub>4</sub>-Ni@HNTs-NH<sub>2</sub>, which was much higher than that by 365 nm light. The results of the absorption coefficient analysis, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra indicated that the lower bandgap of Fe<sub>3</sub>O<sub>4</sub> contributed to the absorption of L-395 and formation of oxygen vacancy, thereby promoting photoelectron migration, activating and breaking P<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>H bonds in PH<sub>3</sub>. The reaction mechanism was studied using first principles theory calculations. It is verified that there is a synergistic catalytic effect between Ni and Fe<sub>3</sub>O<sub>4</sub>, and Fe<sub>3</sub>O<sub>4</sub> plays a major role in the photocatalysis, while the bonding orbitals of the Ni site having lower energies exhibit a better non-photocatalytic performance than Fe<sub>3</sub>O<sub>4</sub>. The catalytic decomposition mechanisms of PH<sub>3</sub> on Fe<sub>3</sub>O<sub>4</sub>-Ni@HNTs-NH<sub>2</sub> in photocatalytic and non-photocatalytic ways have been proposed. The halloysite nanotubes co-doped by Ni and Fe<sub>3</sub>O<sub>4</sub> is an efficient and environment-friendly catalyst for both abatement and utilization of industrial waste PH<sub>3</sub> gas.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"28 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050686","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 : 2025-01-28DOI: 10.1016/j.cej.2025.159887
Jiawei Liu, Zhilin Zhang, Junhao Lin, Li Zhen, Qingyang Jiang, Jun Shi, Huiping Deng
While oxygen vacancies (Ov) in single semiconductor photocatalysts have been extensively studied, investigations into and comprehensive understanding of electron transfer and intrinsic mechanisms of Ov in heterojunction photocatalysts—particularly S-scheme heterojunctions—remain inadequate. In this study, novel oxygen vacancy-rich Ov-Bi4O7/Bi3.64Mo0.36O6.55 (MOB) S-scheme heterojunction catalysts were designed and constructed. These catalysts combine oxygen vacancy-rich Bi4O7 with Bi3.64Mo0.36O6.55 (BMO) to enhance interfacial charge transfer across the heterojunction and generate active centers enriched with oxygen vacancies. The optimized MOB-32 heterojunction achieved 97.6% degradation of tetracycline (TC) under light irradiation. The introduction of Ov improved the local electronic structure and microenvironment of the S-scheme heterojunction. Femtosecond transient absorption spectroscopy (Fs-TAS) reveals that Ov introduces additional charge transport pathways, which enhance the efficiency of charge separation. This study provides insights into the dynamics of photogenerated carriers at interfaces modulated by oxygen vacancies, contributing to the development of efficient S-scheme photocatalysts.
{"title":"Oxygen vacancy-modified fast charge transport channels at the interface of bismuth S-scheme heterojunctions promoting photocatalytic performance","authors":"Jiawei Liu, Zhilin Zhang, Junhao Lin, Li Zhen, Qingyang Jiang, Jun Shi, Huiping Deng","doi":"10.1016/j.cej.2025.159887","DOIUrl":"https://doi.org/10.1016/j.cej.2025.159887","url":null,"abstract":"While oxygen vacancies (Ov) in single semiconductor photocatalysts have been extensively studied, investigations into and comprehensive understanding of electron transfer and intrinsic mechanisms of Ov in heterojunction photocatalysts—particularly S-scheme heterojunctions—remain inadequate. In this study, novel oxygen vacancy-rich Ov-Bi<sub>4</sub>O<sub>7</sub>/Bi<sub>3.64</sub>Mo<sub>0.36</sub>O<sub>6.55</sub> (MOB) S-scheme heterojunction catalysts were designed and constructed. These catalysts combine oxygen vacancy-rich Bi<sub>4</sub>O<sub>7</sub> with Bi<sub>3.64</sub>Mo<sub>0.36</sub>O<sub>6.55</sub> (BMO) to enhance interfacial charge transfer across the heterojunction and generate active centers enriched with oxygen vacancies. The optimized MOB-32 heterojunction achieved 97.6% degradation of tetracycline (TC) under light irradiation. The introduction of Ov improved the local electronic structure and microenvironment of the S-scheme heterojunction. Femtosecond transient absorption spectroscopy (Fs-TAS) reveals that Ov introduces additional charge transport pathways, which enhance the efficiency of charge separation. This study provides insights into the dynamics of photogenerated carriers at interfaces modulated by oxygen vacancies, contributing to the development of efficient S-scheme photocatalysts.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"9 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055209","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 : 2025-01-28DOI: 10.1016/j.cej.2025.160057
Donghyun Lee, Junseo Gu, Jeonghoon Oh, Kwanlae Kim
Introducing a porous structure into the friction layer of TENGs is an effective and facile non-additive physical modification method that can increase the contact area during the contact–separation motion. However, the porosity can reduce the charge-storage capacity owing to decreased density. In this study, a TENG was rationally designed by employing a friction layer composed of a porous polyvinylidene fluoride/BaTiO3 nanoparticle nanocomposite and intermediate layers of polydimethylsiloxane and Cu nanowires to address these limitations. The non-porous friction layer combined with storage and transport layers resulted in a peak-to-peak voltage (Vpp) increase from 30.8 to 84.9 V, while the porous friction layer achieved a significant Vpp enhancement from 75.0 to 206.4 V. This improvement was attributed to the synergistic effect of the increased contact area by the porous friction layer and the enhanced charge-storage capacity provided by the storage layer. The triboelectric charges effectively generated by the increased contact area induced strong electrostatic induction in the charges of the electrode, facilitated by the enhanced charge-storage capacity of the storage layer. Moreover, the transport layer reduced the time required to reach the maximum charge-storage capacity and improved the response speed of the TENG to external mechanical stimuli.
{"title":"Synergistic effects of porous ferroelectric friction layer and intermediate layers for remarkable performance enhancement of triboelectric nanogenerator","authors":"Donghyun Lee, Junseo Gu, Jeonghoon Oh, Kwanlae Kim","doi":"10.1016/j.cej.2025.160057","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160057","url":null,"abstract":"Introducing a porous structure into the friction layer of TENGs is an effective and facile non-additive physical modification method that can increase the contact area during the contact–separation motion. However, the porosity can reduce the charge-storage capacity owing to decreased density. In this study, a TENG was rationally designed by employing a friction layer composed of a porous polyvinylidene fluoride/BaTiO<sub>3</sub> nanoparticle nanocomposite and intermediate layers of polydimethylsiloxane and Cu nanowires to address these limitations. The non-porous friction layer combined with storage and transport layers resulted in a peak-to-peak voltage (<em>V</em><sub>pp</sub>) increase from 30.8 to 84.9 V, while the porous friction layer achieved a significant <em>V</em><sub>pp</sub> enhancement from 75.0 to 206.4 V. This improvement was attributed to the synergistic effect of the increased contact area by the porous friction layer and the enhanced charge-storage capacity provided by the storage layer. The triboelectric charges effectively generated by the increased contact area induced strong electrostatic induction in the charges of the electrode, facilitated by the enhanced charge-storage capacity of the storage layer. Moreover, the transport layer reduced the time required to reach the maximum charge-storage capacity and improved the response speed of the TENG to external mechanical stimuli.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"22 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055215","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 : 2025-01-28DOI: 10.1016/j.cej.2025.159700
Massimo Corda, Olena Vovk, Maya Marinova, Thomas Len, Vita A. Kondratenko, Evgenii V. Kondratenko, Vitaly V. Ordomsky, Andrei Y. Khodakov
The interest in the production of light olefins stems from their pivotal role as building blocks in the chemical industry. In the direct synthesis of light olefins from syngas via the methanol-mediated route over bifunctional catalysts, intermediate hydrogenation of CO to methanol occurs on a metal oxide catalyst, followed by the conversion of methanol to light olefins over a zeolite.This work introduces a novel approach to the synthesis of light olefins from syngas by proposing the use of metallic silver-supported nanoparticles as a key component in the design of bifunctional catalysts. Departing from the traditional use of metal oxide catalysts, we propose the application of metallic silver, which has not previously been explored in this context. Transient kinetic experiments have shown irreversible adsorption of carbon monoxide on zirconia-supported silver catalyst under the reaction conditions. The resulting hybrid zirconia-supported silver catalysts, paired with SAPO-34 zeolite, demonstrate a remarkable enhancement in the selectivity toward light olefins and a significant reduction in methane production compared to conventional zinc-zirconia based systems. This work challenges the traditional approaches to designing catalysts for selectively converting carbon monoxide into light olefins using conventional oxide-zeolite (OX-ZEO) catalysts.
{"title":"Syngas conversion to light olefins over silver metallic nanoparticles in bifunctional catalysts","authors":"Massimo Corda, Olena Vovk, Maya Marinova, Thomas Len, Vita A. Kondratenko, Evgenii V. Kondratenko, Vitaly V. Ordomsky, Andrei Y. Khodakov","doi":"10.1016/j.cej.2025.159700","DOIUrl":"https://doi.org/10.1016/j.cej.2025.159700","url":null,"abstract":"The interest in the production of light olefins stems from their pivotal role as building blocks in the chemical industry. In the direct synthesis of light olefins from syngas via the methanol-mediated route over bifunctional catalysts, intermediate hydrogenation of CO to methanol occurs on a metal oxide catalyst, followed by the conversion of methanol to light olefins over a zeolite.This work introduces a novel approach to the synthesis of light olefins from syngas by proposing the use of metallic silver-supported nanoparticles as a key component in the design of bifunctional catalysts. Departing from the traditional use of metal oxide catalysts, we propose the application of metallic silver, which has not previously been explored in this context. Transient kinetic experiments have shown irreversible adsorption of carbon monoxide on zirconia-supported silver catalyst under the reaction conditions. The resulting hybrid zirconia-supported silver catalysts, paired with SAPO-34 zeolite, demonstrate a remarkable enhancement in the selectivity toward light olefins and a significant reduction in methane production compared to conventional zinc-zirconia based systems. This work challenges the traditional approaches to designing catalysts for selectively converting carbon monoxide into light olefins using conventional oxide-zeolite (OX-ZEO) catalysts.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055265","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 : 2025-01-28DOI: 10.1016/j.cej.2025.160062
Shuang Zhong, Yu Tian, Chen Chen, Bin Nie, Hongyan Wang, Shengyu Zhang
The utilization of nitrogen and sulfur-codoped biochar-activated peroxymonosulfate (PMS) has emerged as a promising advanced oxidation technology for the degradation of organic pollutants. However, the dominant active sites, especially the specific defect structures governing PMS activation and their subsequent activation mechanism remain ambiguous, posing challenges to the rational design of high-performance biochar catalysts. Herein, a series of nitrogen and sulfur-codoped biochar (NSBC) with varying pyrolysis temperatures and doping levels were synthesized. An investigation into the relationship between their properties and the reaction rate constants of 2,4-dichlorophenol (2,4-DCP) degradation by activated PMS revealed that intrinsic defects, thiophene S, and graphitic N were active sites in the oxidation reaction, with intrinsic defects identified as playing a predominant role. Density functional theory (DFT) calculations combined with electrochemical measurements further revealed the crucial role of single-vacancy defective configuration in mediating a direct electron transfer pathway for 2,4-DCP degradation. Moreover, double-vacancy and topological defects facilitated the transfer of electrons to adsorbed PMS, leading to the release of 1O2 and subsequent degradation of 2,4-DCP. The distinctive mechanism enabled the NSBC-activated PMS system to exhibit high selectivity and effectively remove 2,4-DCP from a complex aquatic environment. The findings from this study provide valuable insights into the role of specific structural defects in PMS activation and offer theoretical support for the design of biochar catalysts with heteroatom doping strategies.
{"title":"Roles of intrinsic defects on nitrogen, sulfur-codoped biochar in peroxymonosulfate activation toward organic contaminates degradation","authors":"Shuang Zhong, Yu Tian, Chen Chen, Bin Nie, Hongyan Wang, Shengyu Zhang","doi":"10.1016/j.cej.2025.160062","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160062","url":null,"abstract":"The utilization of nitrogen and sulfur-codoped biochar-activated peroxymonosulfate (PMS) has emerged as a promising advanced oxidation technology for the degradation of organic pollutants. However, the dominant active sites, especially the specific defect structures governing PMS activation and their subsequent activation mechanism remain ambiguous, posing challenges to the rational design of high-performance biochar catalysts. Herein, a series of nitrogen and sulfur-codoped biochar (NSBC) with varying pyrolysis temperatures and doping levels were synthesized. An investigation into the relationship between their properties and the reaction rate constants of 2,4-dichlorophenol (2,4-DCP) degradation by activated PMS revealed that intrinsic defects, thiophene S, and graphitic N were active sites in the oxidation reaction, with intrinsic defects identified as playing a predominant role. Density functional theory (DFT) calculations combined with electrochemical measurements further revealed the crucial role of single-vacancy defective configuration in mediating a direct electron transfer pathway for 2,4-DCP degradation. Moreover, double-vacancy and topological defects facilitated the transfer of electrons to adsorbed PMS, leading to the release of <sup>1</sup>O<sub>2</sub> and subsequent degradation of 2,4-DCP. The distinctive mechanism enabled the NSBC-activated PMS system to exhibit high selectivity and effectively remove 2,4-DCP from a complex aquatic environment. The findings from this study provide valuable insights into the role of specific structural defects in PMS activation and offer theoretical support for the design of biochar catalysts with heteroatom doping strategies.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"40 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055429","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 : 2025-01-28DOI: 10.1016/j.cej.2025.160068
Yalin Chen, Jing Huang, Cheng Zhao, Wenbin Li, Xuan Zhang, Bojun Huang, Zhongliang Huang, Hui Li, Zizi Man, Yi Man, Weiping Xiong, Zhaohui Yang
Camellia oleifera cake (COC) is a by-product of the Camellia oleifera oil collection process, which is rich in nutrients such as polysaccharide and protein. This study represents the first use of COC as a microbial medium substitute and its potential for producing bioflocculants. The COC was used to culture Paenibacillus polymyxa GA1, and its colony counts was more than one order of magnitude higher than that in the traditional fermentation medium, increasing from CFU/mL to CFU/mL. The bioflocculant produced by GA1 had a flocculation efficiency of 98.9 ± 0.4 % on kaolin suspension, which remained unchanged when the volume of acetone used in extracting the bioflocculant was reduced by 75 %. Chlorella vulgaris was harvested with the bioflocculant and the harvesting efficiency reached 95.6 ± 0.3 %, even without improving the pH. The above results demonstrate the potential of COC as an alternative medium.
{"title":"Sustainable harvesting of Chlorella vulgaris using bioflocculants from Camellia oleifera cake-based medium","authors":"Yalin Chen, Jing Huang, Cheng Zhao, Wenbin Li, Xuan Zhang, Bojun Huang, Zhongliang Huang, Hui Li, Zizi Man, Yi Man, Weiping Xiong, Zhaohui Yang","doi":"10.1016/j.cej.2025.160068","DOIUrl":"https://doi.org/10.1016/j.cej.2025.160068","url":null,"abstract":"<em>Camellia oleifera</em> cake (COC) is a by-product of the <em>Camellia oleifera</em> oil collection process, which is rich in nutrients such as polysaccharide and protein. This study represents the first use of COC as a microbial medium substitute and its potential for producing bioflocculants. The COC was used to culture <em>Paenibacillus polymyxa</em> GA1, and its colony counts was more than one order of magnitude higher than that in the traditional fermentation medium, increasing from <span><math><mrow is=\"true\"><mn is=\"true\">0.6</mn><mo is=\"true\">×</mo><msup is=\"true\"><mrow is=\"true\"><mn is=\"true\">10</mn></mrow><mn is=\"true\">7</mn></msup></mrow></math></span> CFU/mL to <span><math><mrow is=\"true\"><mn is=\"true\">1.8</mn><mo is=\"true\">×</mo><msup is=\"true\"><mrow is=\"true\"><mn is=\"true\">10</mn></mrow><mn is=\"true\">8</mn></msup></mrow></math></span> CFU/mL. The bioflocculant produced by GA1 had a flocculation efficiency of 98.9 ± 0.4 % on kaolin suspension, which remained unchanged when the volume of acetone used in extracting the bioflocculant was reduced by 75 %. <em>Chlorella vulgaris</em> was harvested with the bioflocculant and the harvesting efficiency reached 95.6 ± 0.3 %, even without improving the pH. The above results demonstrate the potential of COC as an alternative medium.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"31 1","pages":""},"PeriodicalIF":15.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055430","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}
H bonds in PH3. The reaction mechanism was studied using first principles theory calculations. It is verified that there is a synergistic catalytic effect between Ni and Fe3O4, and Fe3O4 plays a major role in the photocatalysis, while the bonding orbitals of the Ni site having lower energies exhibit a better non-photocatalytic performance than Fe3O4. The catalytic decomposition mechanisms of PH3 on Fe3O4-Ni@HNTs-NH2 in photocatalytic and non-photocatalytic ways have been proposed. The halloysite nanotubes co-doped by Ni and Fe3O4 is an efficient and environment-friendly catalyst for both abatement and utilization of industrial waste PH3 gas.
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