复合光催化剂AgCl/AgBr降解水中四溴双酚A的研究

Photocatalytic Degradation of Tetrabromobisphenol A with Composite AgCl/AgBr

通过简单易行的沉淀工艺制备了具有优异光催化性能的AgCl/AgBr复合光催化剂.用X射线衍射(XRD)、扫描电子显微镜(SEM)、能量色散X射线光谱(EDX)和紫外可见漫反射光谱对该材料的结晶结构、形貌特征和光吸收特性进行了表征,并且在可见光照射下降解水中四溴双酚A(TBBPA).研究结果表明:AgCl/AgBr具有优异的光催化活性,反应30min后对四溴双酚A的降解率达98.49%.探讨了AgCl/AgBr复合材料可能的光催化机理,发现·OH和·O^-2是主要活性物质,并且在反应过程中有效地阻止了电子空穴对的复合,使材料表现出优异的光催化性能.

An efficient visible-light-driven AgCl/AgBr composite photocatalyst was fabricated through a simple precipitation process. The crystal structure,morphology and light absorption properties of the silver matrix composite were characterized with X-ray diffraction (XRD),scanning electron microscopy (SEM),energy dispersive X-ray spectroscopy (EDX) and UV-vis diffuse reflection spectroscopy (DRS). The as-prepared AgCl/AgBr composite was used to degradate tetrabromobisphenol A under visible-light irradiation. It was found that AgCl/AgBr could degradate TBBPA almost completely in 30 min and the degradation rate was 98.49%. Finally,the possible photocatalytic mechanism of the AgCl/AgBr composite was discussed,and it was found that ·OH and ·O ^- 2 were the main active materials and the photocatalyst prevented the recombination of electron-hole pairs during the reaction,which contributed to the excellent performance of the photocatalytic activity.