二氧化铈-银/碘化银光催化剂的制备及水中有机污染物去除性能

Preparation of cerium dioxide silver iodide photocatalyst for removing organic pollutants in water

半导体光催化技术对水中有机污染物有较好的处理效果,且不会造成二次污染,因此是一种很有前景的废水处理技术。传统的光催化材料几乎不能有效地利用可见光进行光催化反应,因而寻求和开发出新型可见光驱动光催化材料很有必要。铈作为我国地藏丰富的稀土元素之一,其氧化物二氧化铈有着n型半导体的性质,具有成本低、可作为催化剂复合材料等优点。研究了二氧化铈-银/碘化银复合催化剂及其对复杂有机物罗丹明B的降解,根据实验结果,提出了二氧化铈-银/碘化银和罗丹明B催化体系的n型和p型杂化半导体电子结构及相关催化机理。

Photocatalysis is considered to be a promising method for effectively degrading organic pollutants in water without secondary pollution.It is necessary to seek and develop new photocatalysts that can catalyze using visible light which traditional photocatalysts is not capable of.As one of the rich rare earth elements in China,cerium in its dioxide form has the advantages of low cost and being able to be used to prepare catalyst composite.In this work,cerium dioxide/silver iodide composites were studied as catalysts under irradiating light toward visible range.Cerium dioxode silver iodide composite catalysts with different silver were synthesized.The cerium based catalysts have been used to treat rhodamine B and the degradation effect has been demonstrated.In treatment of rhodamine B,the best loading capacity for the degradation has been obtained.Based on the experimental results,the hybrid n-type and p-type electronic structure and catalytic mechanism of the catalytic system has been proposed.