A novel amorphous CoS x /NH 2 -MIL-125 composite for photocatalytic degradation of rhodamine B under visible light
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A novel amorphous CoSx/NH2-MIL-125 composite for photocatalytic degradation of rhodamine B under visible light Shengjun Liu1,2, Qichao Zou1, Yan Ma1, Wen Sun1, Yu Li1, Jian Zhang1, Cheng Zhang1, Lifang He1, Yudie Sun1, Qian Chen1, Bo Liu3,*, Hexin Zhang1,*, and Kui Zhang1,*
1
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma Xiang Road, Ma‘anshan, Anhui 243032, People’s Republic of China 2 Institute of Materials Science and Engineering, Anhui University of Technology, , Ma Xiang Road, Ma‘anshan, Anhui 243032, People’s Republic of China 3 Hefei National Laboratory for Physics Sciences At Microscale, Fujian Innovation Institute of Chinese Academy of Sciences, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
Received: 16 May 2020
ABSTRACT
Accepted: 30 August 2020
Metal–organic frameworks (MOFs) are a new type of porous crystal materials that have been widely used in various fields. Owing to their adjustable porous structure, MOF photocatalysts with high catalytic activity have become a research hotspot. In this study, NH2-MIL-125/CoSx samples were investigated as a novel visible light-responsive catalyst for the removal of organic dye. The NH2-MIL-125/CoSx-20 composites showed the best photodegradation efficiency, where photodegradation of the rhodamine B reached 95.4% in 45 min. CoSx was able to effectively extend the wavelength absorption range of NH2MIL-125 and effectively separate the photogenerated electrons and holes and that could lead to the improved photocatalytic performance of the composites. The reactive superoxide radical (O2-) was identified as the main active species using reactive species capture experiments, and a reasonable photocatalytic mechanism was proposed. This paper is intended to guide the development of organic–inorganic hybrid materials for environmental remediation.
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Springer Science+Business
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Handling Editor: Pedro Camargo.
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https://doi.org/10.1007/s10853-020-05210-4
J Mater Sci
Introduction The direct conversion of solar energy into chemical energy using semiconductor photocatalysis is an important strategy for environmental remediation and the generation of renewable energy. Although there are many methods to remove pollutants in water, such as adsorption, electrocatalysis and so on [1, 2]. However, due to its low energy consumption, photocatalysis has attracted more and more attention [3]. To date, many studies have focused on semiconductor catalysts such as nanoparticles, graphene, metal oxides, metal sulfides and quantum-dot sensitized nanocomposites [4–8]. Owing to the excellent electrical and optical properties, semiconductor photocatalysts present photocatalytic ability. Of these catalysts, cobalt sulfide is affordable and has been widely regarded as a promising catalytic material. Recent studies have demons
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