Fabrication of novel Cu2WS4/NiTiO3 heterostructures for efficient visible-light photocatalytic hydrogen evolution and pollutant degradation
Fabrication of novel Cu2WS4/NiTiO3 heterostructures for efficient visible-light photocatalytic hydrogen evolution and pollutant degradation
复制标题
新型 Cu2WS4/NiTiO3 异质结构的制备用于高效可见光催化析氢和污染物降解
DOI：
10.1016/j.jcis.2021.10.179
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发表时间：
2022-01-13
影响因子：
9.9
通讯作者：
Chen, Zhe
中科院分区：
文献类型：
--
作者：
Peng, Dianxiang;Wang, Yueting;Chen, Zhe
设计和开发具有可见光响应的高效耐用的光催化制氢和污染物降解催化剂是最具挑战性的任务之一。本文采用电纺丝/煅烧技术和水热法制备了一种新型Cu2WS4/NiTiO3（简称CWS/NTO； x = 0.25, 0.50, 0.75和1.00）复合材料。制备的CWS/NTO复合材料由二维CWS纳米片和一维NTO纳米纤维组成。XPS结果验证了CWS与NTO之间的界面相互作用，证实了CWS/NTO复合材料中异质结的形成。光催化实验表明，制备的CWS/NTO催化剂在可见光（λ > 420 nm）照射下具有优异稳定的产氢和降解污染物的光催化性能。其中，0.50 CWS/NTO样品的h -2演化活性最高，为810 lmol。g(-1)-h(-1)，在420 nm处表观量子效率（AQE）值为1.65%。对TC、RhB和Cr（VI）的最佳降解速率常数分别为0.030、0.413和0.028 min（-1）。其优异的催化活性可归因于增强的可见光吸附、高比表面积和光生载流子的高效分离。ESR测试和自由基捕获实验证实了这一点。O-2（-）和h（+）是降解TC/RhB的主要活性物质。最后提出了可能的催化机理，并对其进行了详细分析。本研究为合理设计具有优异光催化性能的nitio3基催化剂，用于能源再生和环境修复提供了前景。(C) 2022由爱思唯尔公司出版。
The design and development of efficient and durable catalysts with visible-light response for photocatalytic hydrogen production and pollutants degradation is considered as one of the most challenging tasks. In present work, a novel Cu2WS4/NiTiO3 (abbreviated as CWS/NTO; x = 0.25, 0.50, 0.75 and 1.00) composite was prepared via a facile electrospinning/calcination technique along with a convenient hydrothermal method. The as-prepared CWS/NTO composite was composed of 2D CWS nanosheets and 1D NTO nanofibers manifested by SEM and TEM images. The results of XPS verified the interfacial interaction between CWS and NTO, confirming the heterojunction formation in CWS/NTO composite. Photocatalytic tests demonstrated as-prepared CWS/NTO catalysts exhibited outstanding and stable photocatalytic performances for H-2 production and pollutants degradation under visible light (lambda > 420 nm) irradiation. Specially, 0.50 CWS/NTO sample displayed the highest H-2-evolution activity of 810 lmol.g(-1)-h(-1) with the apparent quantum efficiency (AQE) value of 1.65 % at 420 nm. Additionally, it also exhibited the optimal photodegradation properties with the rate constants of 0.030, 0.413 and 0.028 min(-1) for TC, RhB and Cr(VI), respectively. The excellent catalytic activities could be attributed to the enhanced visible light adsorption, high specific surface area and efficient separation of photogenerated charge carriers. The ESR tests and free radicals capturing experiments confirmed that.O-2(-) and h(+) were primary active species for TC/RhB degradation. Eventually, the probable catalytic mechanism was put forward and detailly analysed. The present work provides perspectives of rational design on NiTiO3-based catalysts with superior photocatalytic performance for energy regeneration and environmental remediation. (C) 2022 Published by Elsevier Inc.