Liu Yangbin, Liu Nian, Lin Minghua, Huang Caifeng, Lei Zhijun, Cao Hongshuai, Qi Fugang, Ouyang Xiaoping
School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, PR China; Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan, 411105, PR China.
School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, PR China; Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan, 411105, PR China.
Environ Pollut. 2023 May 15;325:121436. doi: 10.1016/j.envpol.2023.121436. Epub 2023 Mar 10.
The traditional semiconductor photocatalysts for solving the related environmental aggravation are often challenged by the recombination of photogenerated carriers. Designing an S-scheme heterojunction photocatalyst is one of the keys to tackling its practical application problems. This paper reports an S-scheme AgVO/AgS heterojunction photocatalyst constructed via a straightforward hydrothermal approach that exhibits outstanding photocatalytic degradation performances to the organic dye Rhodamine B (RhB) and antibiotic Tetracycline hydrochloride (TC-HCl) driven by visible light. The results show that AgVO/AgS heterojunction with a molar ratio of 6:1 (V6S) possesses the highest photocatalytic performances, 99% of RhB can be almost degraded by 0.1 g/L V6S within 25 min light illumination, and about 72% of TC-HCl can be photodegraded with the act of 0.3 g/L V6S under 120 min light irradiation. Meanwhile, the AgVO/AgS system exhibits superior stability and maintains high photocatalytic activity after 5 repeated tests. Moreover, the EPR measurement and radical capture test identify that superoxide radicals and hydroxyl radicals mainly contribute to the photodegradation process. The present work demonstrates that constructing an S-scheme heterojunction can effectively inhibit the recombination of carriers, providing insights into the fabrication of applied photocatalysts for practical wastewater purification treatment.
用于解决相关环境恶化问题的传统半导体光催化剂常常受到光生载流子复合的挑战。设计一种S型异质结光催化剂是解决其实际应用问题的关键之一。本文报道了一种通过简单水热法构建的S型AgVO/AgS异质结光催化剂，该催化剂在可见光驱动下对有机染料罗丹明B（RhB）和抗生素盐酸四环素（TC-HCl）表现出优异的光催化降解性能。结果表明，摩尔比为6:1（V6S）的AgVO/AgS异质结具有最高的光催化性能，0.1 g/L的V6S在光照25分钟内几乎可以降解99%的RhB，0.3 g/L的V6S在光照120分钟下可光降解约72%的TC-HCl。同时，AgVO/AgS体系表现出优异的稳定性，在5次重复测试后仍保持高光催化活性。此外，电子顺磁共振测量和自由基捕获测试表明，超氧自由基和羟基自由基主要促进光降解过程。目前的工作表明，构建S型异质结可以有效抑制载流子的复合，为制备用于实际废水净化处理的应用光催化剂提供了思路。
