PANI/Bi_2MoO_6复合光催化剂的制备、表征及其可见光催化性能

采用原位氧化聚合法制备了PANI/Bi_2MoO_6复合光催化剂,采用XRD、SEM、PL和UV-Vis DRS等技术对其进行了表征,并将其用于罗丹明B(Rh B)的可见光催化降解。表征结果显示:聚苯胺(PANI)包覆于Bi_2MoO_6微球表面,促进了光生载流子的迁移,抑制了光生电子-空穴对的复合,拓宽了催化剂的可见光响应范围。实验结果表明:PANI/Bi_2MoO_6复合光催化剂具有较高的可见光催化活性和良好的稳定性,当w(PANI)为36%、光照90 min时Rh B去除率达90.4%,明显优于纯Bi_2MoO_6;该体系中,空穴和·O2-在污染物的降解过程中起主要作用;PANI和Bi_2MoO_6之间形成了异质结结构,使光生电子-空穴对有效分离。

Preparation and characterization of PANI/Bi2MoO6 composite photocatalyst and its visible-light photocatalytic activity

PANI/Bi₂MoO₆ composite photocatalyst was prepared by in situ oxidative polymerization method,characterized by XRD,SEM,PL and UV-Vis DRS,and evaluated by visible-light photocatalytic degradation of Rhodamine B （RhB）. The characterization results showed that the surface of Bi₂MoO₆ microsphere was coated with polyaniline （PANI）,which contributed to the transfer of photo-induced carrier,inhibited the recombination of photo-generated electron and hole pairs,and expanded the visible-light response range of the catalysts. The experimental results showed that：The PANI/Bi₂MoO₆ composite exhibited high visible-light-driven photocatalytic activity and good stability;When w（PANI） was 36% and the irradiation time was 90 min,the RhB removal rate was 90.4%,which was much better than that on Bi₂MoO₆;In the reaction system,hole and ·O₂^- played the crucial roles in the pollutant degradation process;The heterojunction structure between PANI and Bi₂MoO₆ contributed to effective separation of the photo-generated electron and hole pairs.