Highly efficient visible-light-driven water splitting for H2 evolution and degradation of ECs using CdS/ZnIn2S4 S-scheme heterojunction with built-in electric field
Mengxue Ji , Jian Wen , Qiuyue Xu , Guanghui Wu , Pinghua Chen , Xibao Li , Hualin Jiang , Xubiao Luo
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引用次数: 0
Abstract
Environmental pollution and energy shortage are two major challenges facing humanity today. Photocatalytic technology, as a green and sustainable approach, is an important choice for effectively addressing these challenges. The formation of S-scheme heterojunctions and built-in electric fields can significantly improve the transfer and separation of photoinduced charge carriers, hence enhancing the efficiency of photocatalytic reactions, which is greatly significant for improving the performance of photocatalysts. In this study, a photocatalyst CdS/ZnIn2S4 with a built-in electric field, which is an S-scheme heterojunction photocatalyst, was prepared by a simple solvothermal method. CdS/ZnIn2S4 exhibited efficient visible-light-driven H2 evolution from water, with a rate of 4.09 mmol g-1h−1, 3.60 and 2.80 times higher than that of CdS and ZnIn2S4, respectively, and an apparent quantum efficiency (AQE) of 2.71 %. Moreover, it also showed performance in visible-light-driven degradation of various ECs, achieving degradation rates of 82.2 %, 80.9 %, and 81.5 % for tetracycline, ciprofloxacin, and norfloxacin, respectively, within 40 min. It was confirmed that the successfully constructed S-scheme heterojunction can effectively separate photoinduced electron-hole pairs and suppress their recombination. The built-in electric field inside the composite material can effectively promote the movement of photoinduced charge carriers, thereby promoting the course of photocatalytic reactions. This study is positively significant for the development of novel efficient photocatalysts, exploration of new methods for environmental pollution control, and development of green hydrogen energy.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.