可见光驱动Z型异质结光催化剂处理染料废水的研究进展

Research progress of visible light driven Z-scheme heterojunction photocatalyst for the treatment of dye wastewater

染料废水对人类和环境危害较大且难以降解,光催化反应作为新兴的绿色环保处理技术,仅利用太阳光激活光催化剂,就可以把废水中难降解的有机污染物转化为CO_(2)和H_(2)O等小分子.光催化技术弥补了传统污水处理技术去除率低、效果不稳定等缺陷,具有可重复利用、无二次污染、处理效率高等优势.Z型异质结作为提高光催化性能的有效手段,具有降低光生电子-空穴对复合速率、扩大光响应范围、高氧化还原性等优点,是近年来新型光催化剂的研究热点,在降解染料废水方面有广泛的应用前景.本文综述了光催化降解污染物的机理、Z型异质结的优势,以及Z型异质结光催化剂在降解染料废水中的应用,提出目前仍存在的问题和今后的研究方向.

Dye wastewaters are harmful to both human beings and the environment that presents a huge challenge for efficient degradation.As an emerging environmentally friendly technology,the photocatalytic reaction harnesses sunlight to activate photocatalysts in the treatment of contaminants of refractory organic pollutants in wastewater,thereby converting them into smaller molecules,such as CO_(2) and H_(2)O.This advanced technique addresses the limitations of conventional sewage treatment methods,which suffered from low removal rates and unstable outcomes.Moreover,photocatalysis exhibits advantages such as reusability,absence of secondary pollution,and high efficiency.To enhance the photocatalytic performance,the design of Z-scheme heterojunction proves to be an efficacious approach,which diminishes the recombination rate of photoinduced electron-hole pairs,broadens the spectrum of light response,and exhibits strong oxidation and reduction capabilities,respectively.Consequently,it has become a novel strategy to design high-performance photocatalysts toward the application in dye wastewater degradation.This review provides an overview of the underlying mechanism of photocatalytic pollutant degradation,highlights the benefits of Z-scheme heterojunction,explores the application in dye wastewater treatment,and points out the current challenges and future research directions.