| 油水自组装制备Ag@AgBr/BiOBr高效可见光催化剂 |
| Oil-in-Water Self-assembled Ag@AgBr/BiOBr: a Highly Efficient Visible Light Photocatalyst |
| 作者 | 单位 | E-mail | | 安伟佳 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | | | 刘利 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | | | 李炘檑 | 第三军医大学学员8营, 重庆 400038 | | | 林双龙 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | | | 胡金山 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | | | 梁英华 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | wkcui@163.com | | 崔文权 | 河北联合大学化学工程学院, 河北省无机非金属材料重点实验室, 唐山 063009 | liangyh@heuu.edu.cn |
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| 摘要: 采用油水自组装法制备Ag@AgBr表面修饰三维花状结构BiOBr复合光催化剂(Ag@AgBr/BiOBr),利用XRD、SEM、TEM、EDX、DRS、XPS、PL及EIS等手段对光催化剂的结构和性能进行了表征,并研究了可见光下降解亚甲基蓝(MB)的催化性能.研究表明:Ag@AgBr粒径约为20nm,均匀分散在花状微球BiOBr表面上;贵金属Ag的表面等离子体效应可显著增强可见光利用率,并有效促进光生电子空穴对的分离,Ag@AgBr(15wt%)/BiOBr光催化剂展现出最优的催化活性,可见光照射30min对MB的降解率将近90%,淬灭实验表明·O2-,h+和Br0均为活性物种.结合理论分析与实验结果提出复合光催化剂的降解机理. |
| 关键词: 油水自组装 Ag@AgBr/BiOBr 光催化 降解 可见光 |
| 基金项目: 国家自然科学基金项目(No.51202056,51372068),河北省杰出青年科学基金(No.B2014209304),河北省自然科学钢铁联合研究基金(No.B2014209314)和河北省引进留学人员资助项目. |
| Abstract: Ahighly efficient photocatalyst consisting of Ag@AgBr nanoparticles decorated by three-dimensional flower-like hierarchical BiOBr (Ag@AgBr/BiOBr) were synthesized via a facile oil-in-water self-assembly method and applied to decontaminate methylene blue (MB) solution. The photocatalysts were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy dispersive X-ray (EDX), UV-Vis diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) photocurrent and electrochemical impedance spectra (EIS) measurement. The results showed that the Ag@AgBr nanoparticles possessed average diameters of 20 nm, and were tightly adhered to the surface of the BiOBr. Ag@AgBr/BiOBr composites enhanced the visible light absorption efficiency and efficiently accelerated the separation of the photogenerated charge carriers due to the surface plasmonic resonance. Meanwhile, the Ag@AgBr(15wt%)/BiOBr composite photocatalyst showed the highest degradation rate, and about 90% of MBcould be degraded under visible light irradiation for 30 min. Additionally, studies performed using radical scavengers indicated that ·O2-, h+ and Br0 acted as the main reactive species. On the basis of experimental and theoretical results, the photocatalytic mechanism was proposed. |
| Keywords: oil-in-water self-assembly Ag@AgBr/BiOBr photocatalytic degradation visible light |
| 投稿时间：2014-08-23 修订日期：2014-11-20 |
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| 安伟佳,刘利,李炘檑,林双龙,胡金山,梁英华,崔文权.油水自组装制备Ag@AgBr/BiOBr高效可见光催化剂[J].无机化学学报,2015,31(2):329-337. |
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