银纳米线/二氧化钛核壳结构的制备及可见光光催化性能  

Synthesis and Visible Light Photodegradation Activity of Ag NW@TiO Core-shell Structure

作　　者：慕楠 刘艳改 惠壮 周兴汶 郭伟[2] 金超 彭鹏[2] MU Nan;LIU Yangai;HUI Zhuang;ZHOUXinwen;GUO Wei;JIN Chao;PENG Peng(Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes,National Laboratory of Mineral Materials,School of Materials Science and Technology,China University of Geosciences,Beijing 100083,China;School of Mechanical and Automation,Beihang University,Beijing 100191,China;School of Environmental Science and Engineering,Sun Yat-Sun University,Guangzhou 510275,China)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,非金属矿物与固废资源材料化利用北京市重点实验室,矿物岩石材料开发应用国家专业实验室,北京100083 [2]北京航空航天大学机械工程及自动化学院,北京100191 [3]中山大学环境科学与工程学院,广州510275

出　　处：《硅酸盐学报》2020年第9期1454-1461,共8页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2017YFB1104900);北京市自然科学基金(3192020);国家自然科学基金(51975033)。

摘　　要：以有机染料罗丹明B为目标降解物,采用水热法制备了不同负载比例的银纳米线(AgNW)@TiO2核壳复合结构光催化剂,评价其可见光催化活性。结果表明:核壳结构经煅烧后为AgNWs和锐钛矿型TiO2,TiO2带隙减小可实现可见光范围内的激发。当TiO2与AgNWs的摩尔比为84%时,光催化活性最高,对罗丹明B的降解率可达82.2%,主要活性氧化物为超氧自由基。该结构稳定性强,放置263 d后无氧化和相变发生。Silver nanowire(Ag NW)@TiO2 core-shell composite structure photocatalysts with different loading ratios were prepared by a hydrothermal method. The organic dye Rhodamine B(RhB) was used as a target degradation product to evaluate its visible light catalytic activity. The results show that the calcined core-shell structure is still Ag NWs and TiO2 crystals. The core-shell structure reduces the bandgap of TiO2 and can achieve its excitation in the visible range. When a molar ratio of TiO2 to Ag NW is 84%, the maximum photocatalytic activity can be obtained, and the degradation rate of RhB can reach 82.2%. The main active oxide in the degradation is superoxide radical. The structure has a good stability without oxidation or phase transition after more than 263 d of storage.

关 键 词：银纳米线/二氧化钛光催化剂 核壳结构 可见光 二氧化钛 罗丹明B 

分 类 号：TQ174.12[化学工程—陶瓷工业]