钴基氧化物光催化剂在降解有机污染物中的研究进展

Research progress on cobalt-based oxide photocatalysts for degradation of organic pollutants

光催化技术具有催化效应强,反应速率快,不易产生二次污染以及成本低等优势,在水污染控制方面受到了科研工作者的广泛关注。钴基氧化物具有价格低廉、储量丰富、耐腐蚀等优点,是比较理想的光催化剂材料。综述了单一钴金属氧化物、钴基双金属氧化物光催化剂的制备方法、形貌结构及催化性能,总结了其对有机污染物的光催化降解机理。针对钴基氧化物存在的光生载流子复合率高、利用率低且稳定性较差等问题,阐述了对钴基氧化物进行改性构建多元异质结复合催化剂的方法,不仅可以促进光生载流子的分离和转移,抑制光催化反应中电子-空穴对的复合,同时还可以有效控制钴离子浸出,提升其催化活性和稳定性。最后对钴基氧化物光催化剂今后的发展方向进行展望。

Photocatalysis technology,with the advantages of strong catalytic effect,fast reaction rate,less secondary pollution and low cost,has received a lot of attention from researchers in the area of water pollution control.Cobalt-based oxide is an ideal photocatalyst material because of its low price,abundant reserves and corrosion resistance.In this paper,the preparation methods,morphological structures and catalytic properties of single cobalt-based metal oxides and cobaltbased bimetallic oxides were reviewed,and their photocatalytic degradation mechanisms for organic pollutants were summarized.Aiming at the problems of high photogenerated carrier compounding rate,low utilization rate and poor stability of cobalt-based oxides,a method of modifying cobalt-based oxides to construct multivariate heterojunction composite catalysts was described,which not only promoted the separation and transfer of photogenerated carriers and inhibited the compounding of electron/hole pairs in the photocatalytic reaction,but also effectively controlled the cobalt ions leaching,and the catalytic activity and stability were improved.On this basis,the future research of cobalt-based oxide photocatalysts was proposed.