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Zhao B, Li F, Wang J, Li Y, Wei Z, Li W, Ma Q, Wu X. W 18O 49/MnWO 4 heterojunction for highly efficient photocatalytic reduction of CO 2 under full spectrum light. J Colloid Interface Sci 2023; 643:393-402. [PMID: 37084619 DOI: 10.1016/j.jcis.2023.04.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 04/06/2023] [Accepted: 04/11/2023] [Indexed: 04/23/2023]
Abstract
Solar-energy-driven CO2 reduction for chemical reagents production, such as CH3OH, CH4 and CO, has tremendous potential for carbon neutrality in the energy industries. However, the low reduction efficiency limits its applicability. Herein, W18O49/MnWO4 (WMn) heterojunctions were prepared via one-step in-situ solvothermal process. Through this method, W18O49 tightly combined with the surface of MnWO4 nanofibers to form nanoflower heterojunction. It was found that under full spectrum light irradiation for 4 h, the yields of photoreduction of CO2 to CO, CH4 and CH3OH by 3-1 WMn heterojunction were 61.74, 71.30 and 18.98 μmol/g, respectively, which were 2.4, 1.8 and 1.1 times that of pristine W18O49, and ca.20 times that of pristine MnWO4 towards CO production. Furthermore, even in the air atmosphere, the WMn heterojunction still performed excellent photocatalytic performance. Systematic investigations demonstrated that the catalytic performance of WMn heterojunction was improved by superior light utilization and more efficient photo-generated carrier separation and migration as compared with W18O49 and MnWO4. Meanwhile, the intermediate products of the photocatalytic CO2 reduction process were also studied in detail by in-situ FTIR. Therefore, this study provides a new way for designing high efficiency of heterojunction for CO2 reduction.
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Affiliation(s)
- Baolin Zhao
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Fuping Li
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Jinpeng Wang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Yubiao Li
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
| | - Zhenlun Wei
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Wanqing Li
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Qiang Ma
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Xiaoyong Wu
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
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Zhang H, Wang C, Luo H, Chen J, Kuang M, Yang J. Iron Nanoparticles Protected by Chainmail-structured Graphene for Durable Electrocatalytic Nitrate Reduction to Nitrogen. Angew Chem Int Ed Engl 2023; 62:e202217071. [PMID: 36468671 DOI: 10.1002/anie.202217071] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/07/2022]
Abstract
The electrochemical nitrate reduction reaction (NO3 RR) is an appealing technology for regulating the nitrogen cycle. Metallic iron is one of the well-known electrocatalysts for NO3 RR, but it suffers from poor durability due to leaching and oxidation of iron during the electrocatalytic process. In this work, a graphene-nanochainmail-protected iron nanoparticle (Fe@Gnc) electrocatalyst is reported. It displays superior nitrate removal efficiency and high nitrogen selectivity. Notably, the catalyst delivers exceptional stability and durability, with the nitrate removal rate and nitrogen selectivity remained ≈96 % of that of the first time after up to 40 cycles (24 h for one cycle). As expected, the conductive graphene nanochainmail provides robust protection for the internal iron active sites, allowing Fe@Gnc to maintain its long-lasting electrochemical nitrate catalytic activity. This research proposes a workable solution for the scientific challenge of poor lasting ability of iron-based electrocatalysts in large-scale industrialization.
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Affiliation(s)
- Hui Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.,Center for Civil Aviation Composites, Donghua University, Shanghai, 201620, China
| | - Chuqi Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Hongxia Luo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Junliang Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Min Kuang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Jianping Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
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Zhang X, Deng J, Yang C, Wang Z, Liu Y. Selective reduction of nitrite to nitrogen by polyaniline-carbon nanotubes composite at neutral pH. ENVIRONMENTAL RESEARCH 2022; 214:114203. [PMID: 36030923 DOI: 10.1016/j.envres.2022.114203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/17/2022] [Accepted: 08/21/2022] [Indexed: 06/15/2023]
Abstract
The selective reduction of nitrite (NO2-) to nitrogen by chemical reductant is a desirable strategy to remove NO2- from polluted water and wastewater. However, the residue and reuse of chemical reductant are two main issues to be addressed. Herein, a novel polyaniline-carbon nanotubes composite (PANI-CNTs) was developed by in-situ polymerization to selectively reduce NO2- to nitrogen gas (N2). The used PANI-CNTs could be reused after regeneration with NaBH4. The PANI-CNTs could reduce NO2- with 93.9% N2 selectivity at initial pH of 6.8. The NO2- removal efficiency only decreased by 12.08% after five cycles of reduction/regeneration. The interconversion between imine nitrogen (-N) and amine nitrogen (-NH-) groups induced the chemical reduction of NO2- and regeneration of PANI-CNTs. PANI-CNTs exhibited an excellent performance for the removal of NO2- in the presence of competitive ions and in actual water and wastewater samples. This new PANI-CNTs composite may have great potential for water purification and wastewater denitrification.
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Affiliation(s)
- Xuemei Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Jinhua Deng
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Congling Yang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Zhaoli Wang
- Chengdu Academy of Environmental Sciences, Sichuan, Chengdu, 610072, China
| | - Yong Liu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China; Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System, Sichuan, Chengdu, 610066, China.
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Revisiting the mechanisms of nitrite ions and ammonia removal from aqueous solutions: photolysis versus photocatalysis. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2022; 21:1833-1843. [PMID: 35947301 DOI: 10.1007/s43630-022-00260-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 06/22/2022] [Indexed: 10/15/2022]
Abstract
Nitrite ions and ammonia are widespread forms of inorganic water pollutants. Nevertheless, the mechanisms of their photolytic and photocatalytic reactions under UV-A irradiation are still fully undisclosed, particularly, at different pH values under aerobic and inert atmospheres. Herein, we have studied the photolytic decomposition of nitrite ions under different conditions using 365 nm UV-A LED as a light source instead of mercury lamps that emit photons in the UV-B region and generate a lot of heat. The results indicated that the rate of nitrite disproportionation in the dark at pH ≤ 3.0 is remarkably high relative to the rate of the photolytic decomposition. At pH ˃ 3, the photolytic reaction is negligible and nitrite ions showed considerable stability. In contrast, the photocatalytic oxidation of nitrite ions over TiO2 photocatalysts, namely, TiO2P25, TiO2UV100, and TiO2 anatase/brookite mixture proceeds at pH ˃ 3.0. TiO2 P25 exhibited the highest photocatalytic activity at pH 5. Interestingly, the photolytic simultaneous removal of nitrite ions and ammonia was possible at pH 9.0 in the absence of oxygen (Ar atmosphere). A 42.69 ± 0.66%, 27.75 ± 1.7%, and 32.74 ± 0.59% of nitrogen calculated based on nitrite, ammonia, and both of them, respectively, can be removed after 6 h of UV-A irradiation. The selectivity of N2 evolution was 77.6%. The nitrogen removal rate was significantly reduced in the presence of TiO2 photocatalyst evincing that TiO2 photocatalysis is applicable for nitrite ions oxidation, whereas the photolytic process is better suited for the simultaneous removal of nitrite ions and ammonia.
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Preparation of a Bi12O15Cl6@W18O49@g-C3N4/PDI heterojunction with dual charge transfer paths and its photocatalytic performance for phenolic pollutants. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Zhou YP, Wang J, Liu QY, Peng M, Zhao YZ, Li QL, Liu Y, Liu HB. Fabrication of cadmium indium sulfide/cadmium sulfide/polyoxo-titanium cluster composite nanofibers with enhanced photocatalytic activity for nitrite degradation. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118831] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Wang H, Wang J, Xiang X, Zhou Y, Li Q, Tang A, Liao D, Liu Y, Liu HB. Preparation of PVDF/CdS/Bi 2WO 6/ZnO hybrid membrane with enhanced visible-light photocatalytic activity for degrading nitrite in water. ENVIRONMENTAL RESEARCH 2020; 191:110036. [PMID: 32810498 DOI: 10.1016/j.envres.2020.110036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
In this work, a visible light-driven ternary heterojunction photocatalyst, CdS/Bi2WO6/ZnO, was synthesized using hydrothermal, ultrasonic dispersion, and deposition precipitation methods. The results show that photocatalysts with flower-like heterostructures were obtained, which could efficiently separate electron-hole pairs, and the photocatalytic activity was thereby significantly enhanced. Furthermore, CdS/Bi2WO6/ZnO and polyvinylidene fluoride (PVDF) were used to fabricate hybrid membranes via a phase-conversion method. The samples were characterized using SEM, TEM, EDX, XRD, DRS, XPS, PL, and N2 adsorption-desorption isotherms, and the transient photocurrent response. The photocatalytic activity of the hybrid membrane was evaluated, and 92.58% of the nitrite was converted into non-toxic substances within 4 h under simulated sunlight irradiation. This result indicated that the photocatalyst exhibited a good photocatalytic activity after immobilization. The possible mechanism was elucidated by studying the product during the photocatalytic degradation, and the effects of different pH values, electron scavengers, and hole scavengers on the photocatalytic performance were further investigated.
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Affiliation(s)
- Hao Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Jing Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Xin Xiang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Yuanping Zhou
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Qingyun Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China; Key Laboratory of Guangxi Biorefinery, Guangxi University, Nanning, GuangxiProvince, 530003, China
| | - Aixing Tang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China; Key Laboratory of Guangxi Biorefinery, Guangxi University, Nanning, GuangxiProvince, 530003, China
| | - Dankui Liao
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China
| | - Youyan Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China; Key Laboratory of Guangxi Biorefinery, Guangxi University, Nanning, GuangxiProvince, 530003, China
| | - Hai-Bo Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi Province, 530004, China; Key Laboratory of Guangxi Biorefinery, Guangxi University, Nanning, GuangxiProvince, 530003, China.
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Naing HH, Wang K, Li Y, Mishra AK, Zhang G. Sepiolite supported BiVO 4 nanocomposites for efficient photocatalytic degradation of organic pollutants: Insight into the interface effect towards separation of photogenerated charges. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137825. [PMID: 32217434 DOI: 10.1016/j.scitotenv.2020.137825] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 02/20/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
Although the construction of clay-supported photocatalyst is a promising strategy to develop the low cost and high activity photocatalyst, only few works researched the effect of their interfaces on the photocatalytic performance. Herein, a monoclinic BiVO4/sepiolite nanocomposite was fabricated as case to study the transport mechanism of photogenerated carries based on the interfaces effect. The obtained BiVO4/sepiolite nanocomposites exhibited excellent visible light photocatalytic performance. The photocatalytic degradation rates of antibiotic tetracyclines (TCs) and methylene blue (MB) by the nanocomposites are 2 and 5.34 times higher than that by pure BiVO4 under visible light irradiation. XPS and Raman spectra confirmed the strong interfaces effect existing between BiVO4 and sepiolite clay. Moreover, PL and transient photocurrent response suggested that the strong interfaces effect effectively promoted the separation of photogenerated electron-hole pairs and further enhanced the photocatalytic performance. In addition, the results of trapping experiments revealed that the photo-induced holes (h+) were the dominant active species in the photocatalytic mechanism. This work illuminates the photocatalytic mechanism of monoclinic BiVO4/sepiolite nanocomposites and provides a novel strategy for designing the clay-supported photocatalyst for degradation of organic pollutants.
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Affiliation(s)
- Htet Htet Naing
- Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Kai Wang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Yuan Li
- Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Ajay Kumar Mishra
- Nanotechnology and Water Sustainability Unit, College of Science, Engineering and Technology, University of South Africa, Florida Science Campus, 1709 Rooderport, Johannesburg, South Africa
| | - Gaoke Zhang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
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Zhao X, Zhang G, Zhang Z. TiO 2-based catalysts for photocatalytic reduction of aqueous oxyanions: State-of-the-art and future prospects. ENVIRONMENT INTERNATIONAL 2020; 136:105453. [PMID: 31924583 DOI: 10.1016/j.envint.2019.105453] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 12/26/2019] [Accepted: 12/26/2019] [Indexed: 05/22/2023]
Abstract
Nowadays, an increasing discharge of oxyanions to the natural environment has been attracting worldwide attention. TiO2-based photocatalysis is regarded as one of the most promising technologies for the conversion of toxic oxyanions (such as chromate, nitrate, nitrite, bromate, perchlorate and selenate) to harmless and/or less toxic substances in contaminated waters. Various types of TiO2-based catalysts have been developed, and each of them exhibits its own advantages in catalytic reduction of oxyanions. However, the application of these nanostructured TiO2 in real water bodies remains a challenge, with limitations associated with sunlight harvesting abilities, production costs, reuse stability and exposure risks. Herein, we aim to present a critical review on reported TiO2-based photocatalytic reduction of aqueous oxyanions, provide a comprehensive understanding of the possible reaction pathways of formed active species, and evaluate the reduction performance of different types of TiO2-based catalysts. In addition, the impact of operating parameters (such as solution pH, temperature, dissolved oxygen and coexisting substances) on catalytic reduction performance is discussed. Furthermore, the perspectives of TiO2-based photocatalytic reduction of oxyanions are also proposed.
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Affiliation(s)
- Xuesong Zhao
- Institute of Environmental Engineering and Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China
| | - Guan Zhang
- School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen (HITSZ), Shenzhen 518055, PR China
| | - Zhenghua Zhang
- Institute of Environmental Engineering and Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China.
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Zhang M, Piao C, Wang D, Zhang Z, Wang J, Song Y. Bimetal Cu and Pd decorated Z-scheme NiGa2O4/BiVO4 photocatalyst for conversion of nitride and sulfide dyes to (NH4)2SO4. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115890] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Zhou J, Liu W, Cai W. The synergistic effect of Ag/AgCl@ZIF-8 modified g-C 3N 4 composite and peroxymonosulfate for the enhanced visible-light photocatalytic degradation of levofloxacin. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 696:133962. [PMID: 31442719 DOI: 10.1016/j.scitotenv.2019.133962] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 06/10/2023]
Abstract
In this work, a series of Ag/AgCl@ZIF-8 modified g-C3N4 composites were synthesized and used to degrade levofloxacin (LVFX) in water under visible light irradiation with the assistant of peroxymonosulfate (PMS). The morphologies and physicochemical properties of the materials were characterized by SEM, TEM, XRD, XPS, FTIR, and DRS technologies. The results of photocatalytic experiments showed that in the presence of PMS, the degradation rate of LVFX reached 87.3% in 60min. Furthermore, factors affecting photocatalytic efficiency such as the concentration of PMS, photocatalyst dosage and different pH values were investigated. The degradation products of LVFX were analyzed by LC-MS and the degradation pathway was inferred. Active species trapping experiments indicated that O2-, h+ and SO4- played important roles in the degradation process in the presence of PMS and the possible degradation mechanism was put forward. This work provides a photocatalyst system that is beneficial to the separation of photogenerated carriers and demonstrates the great potential of PMS-assisted photocatalysis in the purification of organic pollutants.
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Affiliation(s)
- Jiabin Zhou
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
| | - Wei Liu
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Weiquan Cai
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
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