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Cai W, Liu J, Luo Y, Liao Z, Li B, Xiang X, Fang Y. Bifunctional CdS-MoO 2 catalysts for selective oxidation of lactic acid coupled with photocatalytic H 2 production. J Colloid Interface Sci 2024; 675:836-847. [PMID: 39002234 DOI: 10.1016/j.jcis.2024.07.081] [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: 04/21/2024] [Revised: 07/08/2024] [Accepted: 07/09/2024] [Indexed: 07/15/2024]
Abstract
The persistent hurdles of charge rapid recombination, inefficient use of light and utilization of sacrificial reagents have plagued the field of photocatalytic hydrogen evolution (PHE). In this research, tiny MoO2 nanoparticles of 10 nm in diameter were prepared through a straightforward solvothermal approach with a specific ratio of oleylamine and oleic acid as stabilizers. The critical factor in the synthesis process was found to be the ratio of oleylamine to oleic acid. Moreover, a two-phase interface assembly method facilitated the uniform deposition of MoO2 onto CdS nanorods. Due to the localized plasmonic-thermoelectric effect on the surface of MoO2 along with its abundant oxygen vacancies, the composite catalyst exhibited outstanding photo-utilization efficiency and an abundance of active sites. The CdS-MoO2 composite displayed a unique photochemical property in transforming lactic acid into pyruvic acid and generating hydrogen simultaneously. After exposure to artificial sunlight for 4 h, significant values of 4.7 and 3.7 mmol⋅g-1⋅h-1 were achieved for hydrogen production and pyruvic acid formation, respectively, exceeding CdS alone by 3.29 and 4.02-fold, while the selectivity of pyruvic acid was 95.68 %. Furthermore, the S-Scheme electron transport mechanism in the composites was elucidated using Electron Paramagnetic Resonance (EPR) spectroscopy, radical trapping experiments, energy band structure analysis, and the identification of critical intermediates in the process of selective oxidation. This work sheds light on the design and preparation of high-performance photocatalysts for biorefining coupled with efficient hydrogen evolution.
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Affiliation(s)
- Wei Cai
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Jincheng Liu
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China.
| | - Yijun Luo
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Zewei Liao
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Bingjie Li
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Xiaoyan Xiang
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Yanxiong Fang
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang Center of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
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Ng KH, Lin YY, Chen LW. Stably suspended SiO 2-supported CdS photocatalyst for a promising organic pollutant degradation in the absence of mechanical stirring. CHEMOSPHERE 2024; 350:141084. [PMID: 38160950 DOI: 10.1016/j.chemosphere.2023.141084] [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: 11/07/2023] [Revised: 12/24/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024]
Abstract
Even with solar-activatable photocatalyst, incommensurable energy input for stirring is still required to overcome the transport limitations in powder-photocatalysis. To counter this, a novel concept of auto-suspending photocatalyst based on SiO2/CdS was proposed to enable promising photo-activity even under stirring-free condition. Functionally-speaking, CdS would act as photoreaction-driver while SiO2 endows sufficient buoyance for suspension-stabilization during stirring-free photocatalysis. In photoreactions degrading methylene blue for theoretical demonstration, SiO2/CdS_0.3 promises only 4.57% activity reduction in non-stirred photoreaction, enabling 15.26% of methylene blue decolorization comparing to 15.99% of stirred-photoreaction under visible light irradiation. This could be ascribed to the slow settling tendency of SiO2/CdS_0.3, evading severe light-shielding under stacked condition. Also, its rightly-exposed SiO2 surface permits 'adsorb-and-degrade' mechanism, thereby overcoming the sluggish surface transport across thick boundary layer. Contrarily, photocatalyst with quintuple CdS content (SiO2/CdS_1.5) exhibits largest activity reduction (31.47%), reasoned by its quick-settling tendency. Overall, current study provides new perspectives to photocatalysis-community. The success elimination of mechanical stirring from photocatalysis promises significant energy-saving (19.1-136 kW/m3), thus consenting better practicality for solar energy-harvesting and environmental protection.
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Affiliation(s)
- Kim Hoong Ng
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei, 24301, Taiwan; R&D Center of Biochemical Engineering Technology, Ming Chi University of Technology, New Taipei, Taiwan; Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei, 24301, Taiwan; Center for Environmental Sustainability and Human Health, Ming Chi University of Technology, New Taipei City, 24301, Taiwan.
| | - Yu-Ya Lin
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei, 24301, Taiwan
| | - Li-Wei Chen
- Department of Chemical Engineering, Ming Chi University of Technology, New Taipei, 24301, Taiwan
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Cheng X, Liu B, Zhao H, Zhang H, Wang J, Li Z, Li B, Chen Z, Hu J. Interfacial effect between Ni 2P/CdS for simultaneously heightening photocatalytic hydrogen production and lignocellulosic biomass photorefining. J Colloid Interface Sci 2024; 655:943-952. [PMID: 37949744 DOI: 10.1016/j.jcis.2023.11.031] [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: 08/11/2023] [Revised: 11/04/2023] [Accepted: 11/06/2023] [Indexed: 11/12/2023]
Abstract
Photorefining of biomass is increasingly recognized as a pivotal technology for the simultaneous production of hydrogen and value-added chemicals. The intrinsic recalcitrance of lignocellulosic biomass puts high demands on the rational design of bifunctional photocatalyst. Herein, Ni2P/CdS with a strong interfacial effect in this work was designed to overcome lignocellulosic biomass photorefining. The strong interfacial effect between Ni2P and CdS not only improved the light absorbance, but also optimized the spatial redistribution of photogenerated electrons and holes. Therefore, Ni2P/CdS exhibited an unprecedented H2 evolution activity (ca. 199.7 mmol·h-1·g-1) in the presence of lactic acid as the traditional sacrificial agent. Considerable H2 generation was also achieved in the presence of lignin (ca. 322.8 μmol·h-1·g-1), cellulose (ca. 534.3 μmol·h-1·g-1) and hemicellulose (ca. 382.2 μmol·h-1·g-1) as the electron donor respectively. Theoretical calculation results indicated that establishing the interfacial effect between Ni2P and CdS optimized their work functions. This optimization fosters improved the redistribution between electrons and holes, as a result, photocatalytic hydrogen production from biomass solution was greatly enhanced. Significantly, Ni2P/CdS showed dual functionalities to produce H2 and value-added compounds from raw biomass directly. This present work demonstrates the potential of raw biomass photorefining through astutely designing photocatalysts.
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Affiliation(s)
- Xi Cheng
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Bo Liu
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Heng Zhao
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada.
| | - Hongguang Zhang
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Jiu Wang
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Zhangkang Li
- Biomedical Engineering Graduate Program, Schulich School of Engineering, University of Calgary, NW, Calgary, Alberta T2N 1N4, Canada
| | - Bei Li
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan 430070, China.
| | - Zhangxin Chen
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
| | - Jinguang Hu
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada.
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Guo C, Huang Z, Long X, Sun Y, Ma P, Zheng Q, Lu H, Yi X, Chen Z. Interfacial electric field construction of hollow PdS QDs/Zn 1-xCd xS solid solution with enhanced photocatalytic hydrogen evolution. NANOSCALE 2024; 16:1147-1155. [PMID: 38186376 DOI: 10.1039/d3nr05518c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
The regulation of hollow morphology, band structure modulation of solid solution, and introduction of cocatalysts greatly promote the separation of electron-hole pairs in photocatalytic processes, which is of great significance for the process of photocatalytic hydrogen evolution (PHE). In this study, we constructed Zn1-xCdxS hollow solid solution photocatalysts using template and ion exchange methods, and successfully loaded PdS quantum dots (PdS QDs) onto the solid solution through in situ sulfidation. Significantly, the 0.5 wt% PdS QDs/Zn0.6Cd0.4S composite material achieved a H2 production rate of 27.63 mmol g-1 h-1 in the PHE process. The hollow structure of the composite material enhances processes such as light reflection and scattering, the band structure modulation of the solid solution enables the electron-hole pairs to reach an optimal exciton recombination balance, and the modification of PdS QDs provides abundant sites for oxidation, thereby promoting the proton reduction and hydrogen evolution rate. This work provides valuable guidance for the rational design of efficient composite PHE catalysts with strong internal electric field.
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Affiliation(s)
- Cheng Guo
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Zongyi Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xinrui Long
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Yuchen Sun
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
| | - Pengfei Ma
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Quanxing Zheng
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Hongliang Lu
- Technology Center, China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, China
| | - Xiaodong Yi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhou Chen
- College of Materials, Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen University, Xiamen 361005, China.
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Yang Z, He S, Liu W, Zou B, Liao W, Wang Y, Wang C, Li S, Niu X. The photocatalytic reduction of U(VI) by Ag-doped SnS 2 materials under visible light. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 88:62-74. [PMID: 37452534 PMCID: wst_2023_210 DOI: 10.2166/wst.2023.210] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Efficient degradation of uranium(VI) (U(VI)) in wastewater is an urgent problem because of the chemical toxicity and radiotoxicity. In this study, the Agx-SnS2 photocatalysts were compounded by a simple hydrothermal method, effectively removing U(VI) under visible light in water. Compared with SnS2, the results indicated that Agx-SnS2 would decrease the crystallinity without destroying the crystal structure. Moreover, it has excellent photocatalytic performance on the degradation rate of U(VI). Ag0.5-SnS2 exhibited a prominent photocatalytic reduction efficiency of UO22+ of about 86.4% under optical light for 75 min. This was attributed to Ag-doped catalysts, which can narrow the band gap and enhance absorption in visible light. Meanwhile, the doping of Ag promoted the separation of photoinduced carriers, so that more photogenerated charges participated in the photocatalytic reaction. The stability and reusability were verified by the cycle test and the potential photocatalytic mechanism was analyzed based on the experiment.
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Affiliation(s)
- Zhiquan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China E-mail:
| | - Shan He
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Wanhui Liu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Baosheng Zou
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Wenning Liao
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Yin Wang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Caiyun Wang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Shuai Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Xiaojun Niu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
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Patil RP, Mahadik MA, Chae WS, Jang JS. Understanding systematic growth mechanism of porous Zn 1-xCd xSe/TiO 2 nanorod heterojunction from ZnSe(en) 0.5/TiO 2 photoanodes for bias-free solar hydrogen evolution. J Colloid Interface Sci 2023; 644:246-255. [PMID: 37119642 DOI: 10.1016/j.jcis.2023.04.054] [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: 01/05/2023] [Revised: 04/10/2023] [Accepted: 04/12/2023] [Indexed: 05/01/2023]
Abstract
Herein, a porous Zn1-xCdxSe structure was developed on TiO2 nanorod (NR) array for photoelectrochemical (PEC) application. Firstly, TiO2 NR and ZnO/TiO2 NR photoanode were synthesized via a series of hydrothermal methods on FTO. Next, the solvothermal synthesis method was adopted to develop inorganic-organic hybrid ZnSe(en)0.5 on ZnO /TiO2 NR-based electrode using different concentrations of the selenium (Se). We found that the ZnO NR acts as a mother material for the formation of inorganic-organic hybrid ZnSe(en)0.5, whereas TiO2 NR acts as a building block. In order to further improve the PEC charge transfer performance, inorganic-organic hybrid ZnSe(en)0.5/TiO2 NR electrode was transferred into a porous Zn1-xCdxSe/TiO2 NR photoanode using the Cd2+ ion-exchange method. The optimized porous Zn1-xCdxSe/TiO2 NR -(2) photoanode converted from ZnSe(en)0.5 -(2) electrode (optimized Se concentration) showed a higher photocurrent density of 6.6 mA·cm-2 at applied potential 0 V vs. Ag/AgCl. The enhanced photocurrent density was owing to the effective light absorption, enhanced charge separation, delay the charge recombination, and porous structure of Zn1-xCdxSe. This work highlights the promising strategy for the synthesis of porous Zn1-xCdxSe/TiO2 NR from inorganic-organic ZnSe(en)0.5/TiO2 NR for effective charge separation and prolonging the lifetime during the photoelectrochemical reaction.
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Affiliation(s)
- Ruturaj P Patil
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan campus 570-752, Republic of Korea
| | - Mahadeo A Mahadik
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan campus 570-752, Republic of Korea
| | - Weon-Sik Chae
- Daegu Center, Korea Basic Science Institute, Daegu 41566, Republic of Korea.
| | - Jum Suk Jang
- Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Jeonbuk National University, Iksan campus 570-752, Republic of Korea.
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