g-C_3N_4/C@Bi_2MoO_6复合光催化剂的制备及其光催化活性

通过水热合成法和液相沉积法制备g-C_3N_4/C@Bi_2MoO_6复合光催化剂,并采用X射线衍射、扫描电子显微镜、氮气吸脱附、紫外-可见漫反射等技术对其进行表征。研究了可见光下g-C_3N_4/C@Bi_2MoO_6催化降解罗丹明B(Rh B)的影响因素,并对其光催化反应机理进行初步探讨。实验结果表明:g-C_3N_4掺杂量为60%(w)时g-C_3N_4/C@Bi_2MoO_6的光催化活性最高;在60%g-C_3N_4/C@Bi_2MoO_6的投加量为1.00 g/L、初始Rh B质量浓度为2.50 mg/L、可见光照射150 min的条件下,Rh B的降解率达到97.90%;在g-C_3N_4/C@Bi_2MoO_6光催化降解体系中,h~+和·O_2~-是主要活性物种。

Preparation and photocatalytic activity of g-C3N4/C@Bi2MoO6 composite photocatalyst

The composite photocatalyst g-C₃N₄/C@Bi₂MoO₆ was prepared by hydrothermal synthesis method and liquid deposition method,and characterized by XRD,SEM,BET and UV-Vis DRS. The factors affecting rhodamine B（Rh B）degradation by g-C₃N₄/C@Bi₂MoO₆ under visible light were studied,and the mechanism of photocatalytic reaction was discussed. The experimental results showed that：When the doping content of g-C₃N₄ was 60%（w）,the photocatalytic activity of g-C₃N₄/C@Bi₂MoO₆ was the highest;Under the conditions of 60%g-C₃N₄/C@Bi₂MoO₆ amount 1.00 g/L,initial Rh B mass concentration 2.50 mg/L and visible light irradiation time 150 min,the degradation rate of Rh B was 97.90%;The photogenerated hole h⁺ and superoxide anion radical ·O₂^- were the major active species in the g-C₃N₄/C@Bi₂MoO₆ photocatalytic degradation system.