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Cr(Ⅵ)是水体和土壤中普遍存在的重金属污染物,其处理方法有物理法﹑化学法和生物法等。光催化还原法是一种较理想的处理含Cr(Ⅵ)废水的高级化学方法。本文根据国内外含Cr(Ⅵ)废水处理时常用光催化剂的类别,对光催化技术处理废水中Cr(Ⅵ)的研究进行综述,分析了各类光催化剂的特点、优点、局限性,光催化还原Cr(Ⅵ)的机理,以及光催化过程中的协同效应。通过讨论认为,寻找高催化活性的新型光催化剂、拓展光催化剂的光响应范围、有效设计Cr(Ⅵ)与其他污染物同时光催化除去的混合体系、将光催化还原法与其他方法偶合等是未来光催化还原Cr(Ⅵ)及其实际应用的发展趋势。
Cr (Ⅵ) is a common heavy metal pollutant in water and soil. The treatment methods include physical method, chemical method and biological method. Photocatalytic reduction method is a more ideal advanced chemical method for treating wastewater containing Cr (Ⅵ). Based on the types of photocatalysts commonly used in Cr (Ⅵ) wastewater treatment at home and abroad, the research on the photocatalytic treatment of Cr (Ⅵ) in wastewater is reviewed. The characteristics, advantages and limitations of various photocatalysts are analyzed. Reduction Cr (Ⅵ) mechanism, and the synergistic effect in the photocatalytic process. Through the discussion, it is considered that searching for a new type of photocatalyst with high catalytic activity, expanding the photoresponse range of the photocatalyst, effectively designing a mixed system of simultaneously removing photocatalytic Cr (Ⅵ) and other pollutants, coupling the photocatalytic reduction method with other methods is Future Photocatalytic Reduction of Cr (Ⅵ) and Its Practical Development Trend.