AgI/BiOI异质结催化剂的制备及其可见光催化降解酸性橙Ⅱ的性能研究  

Preparation of AgI/BiOI Heterojunction Photocatalysts and Their Photocatalytic Degradation of Acid Orange Ⅱ under Visible Light

作　　者：张琼[1] 陈卓华[1] 徐作成[1] 朱林飞[1] 廖唯辰[1] 杨婧羚[1] 何春[1,2] 

机构地区：[1]中山大学环境科学与工程学院,广东广州510275 [2]中山大学广东省环境污染控制与修复技术重点实验室,广东广州510275

出　　处：《中山大学学报（自然科学版）》2012年第6期82-86,102,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(20877025);广东省自然科学基金资助项目(S2011010001836);高校基本科研业务费中山大学青年教师重点培育资助项目(09lgpy20);教育部留学回国人员科研基金资助项目;广州市科技局科学技术资助项目(2010Z2-C1009);中山大学实验室开放基金资助项目(KF201129)

摘　　要：文章采用水热法制备了AgI/BiOI异质结催化剂,并通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见漫反射光谱(DRS)对AgI/BiOI异质结催化剂进行形态特征及光学性质表征。结果表明,制备的AgI/BiOI为高纯度、纳米片层组成的微球结构。DRS结果表明BiOI对可见光有明显的吸收,掺杂AgI后AgI/BiOI异质结催化剂在可见光范围产生红移。以酸性橙Ⅱ为目标污染物,考察了AgI/BiOI的可见光催化活性。研究表明,AgI/BiOI对酸性橙Ⅱ在2 h降解效率可达到90%以上,明显高于单独AgI或BiOI对酸性橙Ⅱ的降解效率。AgI/BiOI异质结催化剂的电化学交流阻抗谱分析表明AgI/BiOI比纯BiOI具有更低的交流阻抗值,因此AgI/BiOI异质结催化剂具有较好的催化活性。In this study, the nanostructured AgI/BiOI heterojunction photocatalyst was prepared by solvothermal process. AgI/BiOI heterojunetion photoeatalyst was characterized using X-ray power diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and UV-vis diffuse reflectance spectroscopy （DRS）. The results indicated that the BiOI product had high purity and composed of nanoplates. The DRS results indicated that BiOI had the significant adsorption in the visible light region, and AgI/BiOI heterojuction photocatalysts possessed the red-shift in the visible light. The photocatalytic activity of AgI/BiOI was evaluated by photocatalytic degradation of acid orange II under visible light irradiation （λ 〉 400 nm）. It was observed that the photocatalytic degradation efficiency of acid orange II was more than 90% within 2 h, which was higher than that of AgI and BiOI. The en- hanced photocatalytic activity mechanism was studied by the electrochemical impedance spectroscopy （EIS）. The EIS results showed that the impedance value of AgI/BiOI was much lower than that of pure BiOI, leading to the enhanced photocatalytic activity of AgI / BiOI heterojunction photocatalysts.

关 键 词：光催化 AGI BiOI 异质结 酸性橙Ⅱ 交流阻抗 

分 类 号：X78[环境科学与工程—环境工程]