| 油水自组装制备Ag@AgBr/BiOBr高效可见光催化剂 |
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| 引用本文： | 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,2013,29(18). |
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| 作者姓名： | 安伟佳 刘利 李炘檑 林双龙 胡金山 梁英华 崔文权 |
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| 作者单位： | 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;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;第三军医大学学员8营, 重庆 400038;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;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;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;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 |
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| 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. |
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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.
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| 关 键 词： | 油水自组装 Ag@AgBr/BiOBr 光催化 降解 可见光 |
Oil-in-Water Self-assembled Ag@AgBr/BiOBr: a Highly Efficient Visible Light Photocatalyst |
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| AN Wei-Ji,LIU Li,LI Xin-Lei,LIN Shuang-Long,HU Jin-Shan,LIANG Ying-Hua and CUI Wen-Quan.Oil-in-Water Self-assembled Ag@AgBr/BiOBr: a Highly Efficient Visible Light Photocatalyst[J].Chinese Journal of Inorganic Chemistry,2013,29(18). |
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| Authors: | AN Wei-Ji LIU Li LI Xin-Lei LIN Shuang-Long HU Jin-Shan LIANG Ying-Hua and CUI Wen-Quan |
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| Institution: | College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China;College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China;Battalion Eight of Cadet Brigade, Third Military Medical University, Chongqing 400038, China;College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China;College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China;College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China;College of Chemical Engineering, Hebei United University, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Tangshan, Hebei 063009, China |
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| 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. |
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| Keywords: | oil-in-water self-assembly Ag@AgBr/BiOBr photocatalytic degradation visible light |
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