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Enhancement of the photocatalytic synchronous removal of Cr(VI) and RhB over RP-modified flower-like SnS2
Nanoscale Advances ( IF 4.7 ) Pub Date : 2020-07-28 , DOI: 10.1039/d0na00489h
Xue Bai 1, 2 , Yanyan Du 1 , Wenhua Xue 1 , Xiaoyun Hu 3 , Jun Fan 1 , Jianli Li 2 , Enzhou Liu 1
Affiliation  

Although photocatalysis is frequently employed to remove various pollutants in water, it still suffers from low efficiency due to the rapid recombination of photogenerated electrons and holes. In this study, a red phosphorus/tin disulfide (RP/SnS2) composite photocatalyst is fabricated by loading nano-sized RP on flower-like SnS2 films with a facile hydrothermal method. It is noteworthy that the 2D heterojunction formed between SnS2 and RP provided channels for the rapid transfer of photon-generated carriers and their effective separation. Furthermore, the separated electrons can react with absorbed O2 for the generation of superoxide radicals (˙O2), thereby impacting the photocatalytic degradation oxidation reaction. The application of photocatalytic synchronous removal of Cr(VI) and RhB over RP/SnS2 was implemented first. Compared with pristine SnS2, the photocatalytic degradation activity of Cr(VI) and RhB over the RP/SnS2 composite was significantly enhanced and the kinetic rate constant reached 8.2, which is 10.8 times that of pristine SnS2. Moreover, the hybrid photocatalysts exhibited prominent reusability and stability. Therefore, a photocatalytic degradation mechanism and pathway of carriers are proposed in the study. Furthermore, it is considered that the present study is a promising method in the treatment of wastewater by photocatalysis.

中文翻译:

增强 RP 改性花状 SnS2 对 Cr(VI) 和 RhB 的光催化同步去除

尽管光催化经常被用于去除水中的各种污染物,但由于光生电子和空穴的快速复合,它仍然存在效率低下的问题。本研究采用简便的水热法将纳米级RP负载在花状SnS 2薄膜上,制备了红磷/二硫化锡(RP/SnS 2 )复合光催化剂。值得注意的是,SnS 2和RP之间形成的二维异质结为光子产生的载流子的快速转移和有效分离提供了通道。此外,分离的电子可以与吸收的O 2反应生成超氧自由基(˙O 2 -),从而影响光催化降解氧化反应。率先实现了RP/SnS 2光催化同步去除Cr( VI )和RhB的应用。与原始SnS 2相比,RP/SnS 2复合材料对Cr( VI )和RhB的光催化降解活性显着增强,动力学速率常数达到8.2,是原始SnS 2的10.8倍. 此外,杂化光催化剂表现出突出的可重复使用性和稳定性。因此,本研究提出了载流子的光催化降解机理和途径。此外,本研究被认为是一种很有前景的光催化废水处理方法。
更新日期:2020-09-16
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