新型磁性异质结材料的制备及其光降解染料废水的性能

Preparation of a magnetic heterojunction photocatalyst and its dye wastewater photodegradation performance

为了解决光催化剂在光生电子与空穴中分离效率低且难以回收利用的问题,以钛碳化铝(Ti_(3)AlC_(2))为原料,通过LiF+HCl刻蚀法、共沉淀法、溶剂热法和异种电荷静电自组装,获得具有磁分离性能的新型异质结光催化材料AMHNTs/TiO_(2)-Ti_(3)C_(2)T_(x)(H&M),对其进行结构表征,并选取偶氮类染料甲基橙(MO)为污染物模型,考察模拟太阳光下H&M的降污性能及降解机理。结果表明:制备的异质结H&M融合了二维层状与一维管状的结构特征,提高电子的传导输送,具有良好的光催化活性和磁回收性,且对MO有较好的降解性能,为构筑新型磁性无机异质结光催化材料和染料的光降解提供有价值的参考。

In order to solve the problems of low efficiency of photogenerated electron-hole separation and recycling difficulty of photocatalysts,AMHNTs/TiO_(2)-Ti_(3)C_(2)T_(x)(H&M)as a new heterojunction photocatalyst with magnetic separation performance was prepared by LiF+HCl etching,coprecipitation,solvothermal and electrostatic self-assembly methods using Ti_(3)AlC_(2) as the raw material,and its structure was characterized.An azo dye methyl orange(MO)was selected as the model pollutant to study the performance and degradation mechanism of H&M under simulated sunlight.The results show that the heterojunction H&M combines two-dimensional layered structure with one-dimensional tubular structure,which can improve electron transport and has good photocatalytic activity and magnetic recovery performance.Moreover,it shows good MO degradation performance.This study provides a valuable reference for the construction of magnetic inorganic heterojunction photocatalytic materials for photodegradation of dyes.