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He S, Liu Y, Wang G, Luo L, Tang X, Xiang D, Jiang T, Jing J, Wang L. Heterojunction photocatalyst FeS 2/g-C 3N 5 for activating sulfites to degrade tetracycline: A stable degradation system based on heterogeneous processes. ENVIRONMENTAL RESEARCH 2023; 237:116939. [PMID: 37611781 DOI: 10.1016/j.envres.2023.116939] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/27/2023] [Accepted: 08/18/2023] [Indexed: 08/25/2023]
Abstract
The UV/sulfite system is a promising source of •SO4- and/or •OH, but its application is largely limited by the use of UV light due to its high cost and high energy consumption. Graphite carbon nitride (g-C3N5), as a new photocatalytic material, has better visible light absorption capacity and narrower band gap than g-C3N4, which is expected to activate sulfite under visible light to solve this problem. Herein, a novel FeS2/CN heterojunction material based on g-C3N5 was constructed by hydrothermal in-situ synthesis method and successfully activated sulfite, which was confirmed by tetracycline degradation experiments in water. Under optimized conditions, the degradation rate of TC in 1 h reached 96%. The experimental results revealed that the FeS2/CN heterostructure enhances the absorption of visible light and inhibits the recombination of carriers, enabling more electrons and holes to be utilized. Holes play a major role in the degradation reaction, promote the sulfite chain reaction, and effectively regulate the cycle of Fe2+ and Fe3+ in the solution. Iron ion leaching is negligible and the degradation reaction remains stable at pH 5-9.
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Affiliation(s)
- Siyu He
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Yaoqi Liu
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Guanlong Wang
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Lingzhi Luo
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Xiaoyun Tang
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Dongmei Xiang
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Tingting Jiang
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China
| | - Jiang Jing
- School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, 611730, China.
| | - Lei Wang
- School of Materials and Environmental Engineering, Institute of Urban Ecology and Environment Technology, Shenzhen Polytechnic, Shenzhen, 518055, China.
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Chen Y, Cheng M, Lai C, Wei Z, Zhang G, Li L, Tang C, Du L, Wang G, Liu H. The Collision between g-C 3 N 4 and QDs in the Fields of Energy and Environment: Synergistic Effects for Efficient Photocatalysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2205902. [PMID: 36592425 DOI: 10.1002/smll.202205902] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Recently, graphitic carbon nitride (g-C3 N4 ) has attracted increasing interest due to its visible light absorption, suitable energy band structure, and excellent stability. However, low specific surface area, finite visible light response range (<460 nm), and rapid photogenerated electron-hole (e- -h+ ) pairs recombination of the pristine g-C3 N4 limit its practical applications. The small size of quantum dots (QDs) endows the properties of abundant active sites, wide absorption spectrum, and adjustable bandgap, but inevitable aggregation. Studies have confirmed that the integration of g-C3 N4 and QDs not only overcomes these limitations of individual component, but also successfully inherits each advantage. Encouraged by these advantages, the synthetic strategies and the fundamental of QDs/g-C3 N4 composites are briefly elaborated in this review. Particularly, the synergistic effects of QDs/g-C3 N4 composites are analyzed comprehensively, including the enhancement of the photocatalytic performance and the avoidance of aggregation. Then, the photocatalytic applications of QDs/g-C3 N4 composites in the fields of environment and energy are described and further combined with DFT calculation to further reveal the reaction mechanisms. Moreover, the stability and reusability of QDs/g-C3 N4 composites are analyzed. Finally, the future development of these composites and the solution of existing problems are prospected.
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Affiliation(s)
- Yongxi Chen
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Min Cheng
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Cui Lai
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Zhen Wei
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Gaoxia Zhang
- Carbon Neutrality Research Institute of Power China Jiangxi Electric Power Construction Co., Ltd., Nanchang, 330001, China
| | - Ling Li
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Chensi Tang
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Li Du
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Guangfu Wang
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
| | - Hongda Liu
- College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China
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Luo X, You Y, Zhong M, Zhao L, Liu Y, Qiu R, Huang Z. Green synthesis of manganese-cobalt-tungsten composite oxides for degradation of doxycycline via efficient activation of peroxymonosulfate. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:127803. [PMID: 34862104 DOI: 10.1016/j.jhazmat.2021.127803] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 11/01/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
The advanced oxidation process of peroxymonosulfate activated by solid catalyst is one of the main technologies to solve the pollution of antibiotics in water environment.In this work, a series of composites (MCW) containing Mn, Co, and W were synthesized using green ball milling, which does not produce the three wastes (waste gas, waste water and industrial residue). It shows a unique and high catalytic activity for peroxymonosulfate-based degradation of doxycycline (DC) under the pH condition between 4 and 9, and it can be reused five times. MCW composites remove DC using singlet oxygen and superoxide free radicals, as well as a large number of oxygen vacancies for electron storage. The formation rate of free radicals is determined by the conversion rates of Mn3+/Mn2+ and Co3+/Co2+. In addition, there are three ways to degrade DC to form 18 kinds of intermediates, and the toxicity of all the intermediates were predicted by ECOSAR program. The highly active catalysts obtained using a green synthetic route for the activation of peroxymonosulfate show a great potential for decontamination of antibiotics wastewater.
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Affiliation(s)
- Xuewen Luo
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Yujie You
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Mingjun Zhong
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Lin Zhao
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Yingying Liu
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Rongliang Qiu
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China
| | - Zhujian Huang
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Natural Resources and Environment, South China Agricultural University, 483 Wushan St., Guangzhou 510642, China.
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