Bi2Sn2O7的不同水热法制备及其可见光光催化除As(III)性能分析

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利用微波和普通水热法合成出了具有可见光响应的Bi2Sn2O7纳米光催化剂,并用X射线衍射(XRD)、氮气吸脱附、紫外-可见漫反射光谱(UV-Vis DRS)、扫描电镜(SEM)、透射电镜(TEM)、电子顺磁共振谱(ESR)、X射线光电子能谱(XPS)等技术对样品的晶相、比表面积、光吸收性能、形貌、光催化活性物种等结构与性质进行了系统表征,比较微波水热Bi2Sn2O7(MH-BSO)与普通水热Bi2Sn2O7(TH-BSO)形貌和微结构,并考察两者在可见光光照下光催化氧化As(III)的性能差别。实验结果表明,MH-BSO具有更细小的粒径和更大的比表面积,而在可见光照射下,MH-BSO样品比TH-BSO样品具有更好的As(III)的光催化氧化能力(可达98.7%)。此外,对Bi2Sn2O7纳米光催化剂氧化去除As(III)的光催化机理进行初步探索,结果表明超氧自由基(O2-?)和空穴(hVB+)是主要起作用的中间反应活性物种。
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