还原电镀废水中Cr(Ⅵ)的光催化剂研究进展

Research progress of photocatalysts for the reduction of Cr(VI)in electroplating wastewater

Cr(Ⅵ)作为电镀废水中常见的重金属污染物,因毒性高、易迁移,因此严重危害环境和人体健康。光催化技术具有节能、高效、易操作、无二次污染等优点,被认为是一种极具应用前景的Cr(Ⅵ)还原技术。为了更好地理解和设计光催化剂催化还原Cr(Ⅵ)到Cr(Ⅲ),从而降低环境中存在的铬离子毒性,在此综述了光催化还原Cr(Ⅵ)到Cr(Ⅲ)的反应机理和光催化Cr(Ⅵ)催化剂的研究进展,并对今后还原去除电镀废水中Cr(Ⅵ)的发展提出了展望,以期为开发出高效率光催化还原Cr(Ⅵ)的催化剂研究提供参考。

Cr(VI)is a common heavy metal contaminant in electroplating wastewater.Due to its high toxicity and easy migration,Cr(VI)seriously harms the environment and human health.Photocatalysis is considered as a promising Cr(VI)reduction technology due to its advantages of energy saving,high efficiency,easy operation and no secondary pollution.In order to better understand and design photocatalysts for catalytic reduction of Cr(VI)to Cr(III),so as to reduce the toxicity of chromium ions in the environment,the reaction mechanism of photocatalytic reduction of Cr(VI)to Cr(III)and the research progress of photocatalytic Cr(VI)catalysts are reviewed.The future development of Cr(VI)removal from electroplating wastewater is prospected,which is expected to provide reference for developing high efficiency photocatalytic catalyst for Cr(VI)reduction.