SiO_(2)@Ag@SiO_(2)@TiO_(2)核壳结构的制备及其光催化降解性能  

Preparation of SiO_(2)@Ag@SiO_(2)@TiO_(2) Core-shell Structure and Its Photocatalytic Degradation Property

作　　者：迟聪聪[1] 屈盼盼 任超男 许馨[1] 白飞飞 张丹洁 CHI Congcong;QU Panpan;REN Chaonan;XU Xin;BAI Feifei;ZHANG Danjie(National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper,Key Laboratory of Paper based Functional Materials of China National Light Industry,Key Laboratory of Functional Printing and Transport Packaging of China National Light Industry,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学轻化工程国家级实验教学中心,陕西省造纸技术及特种纸品开发重点实验室,中国轻工业纸基功能材料重点实验室,中国轻工业功能印刷与运输包装重点实验室,西安710021

出　　处：《无机材料学报》2022年第7期750-756,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金重点项目(31600476);省级大学生创新创业训练计划(S202110708106);陕西省提升公众科学素质计划(2021PSL68)。

摘　　要：光催化是一种绿色且高效的降解染料污染物的方式,在水污染治理中应用广泛。本研究以SiO_(2)为核层,依次采用氧化还原法、改进的Stöber法及水热法合成SiO_(2)@Ag@SiO_(2)@TiO_(2)多层核壳结构作为光催化剂用于染料污染物降解,并探讨了硝酸银(AgNO_(3))、正硅酸乙酯(TEOS)、钛酸四丁酯(TBOT)等用量对包覆效果的影响。采用不同表征手段对样品的微观形貌、物相结构、孔结构参数和光电性能进行分析表征。结果表明,当AgNO_(3)、TEOS、TBOT与SiO_(2)的质量比为5:2.4:6:1,多层核壳结构每层均达到最优包覆效果。与SiO_(2)@TiO_(2)和SiO_(2)@Ag@TiO_(2)催化剂相比较,SiO_(2)@Ag@SiO_(2)@TiO_(2)核壳结构的光催化剂具有更佳的光催化活性,光照45 min可降解93%的MB溶液,经4次循环后其光催化效率为90%。Photocatalytic degradation is an eco-friendly and high-efficiency way to degrade dye pollutants which has broad application prospects in water pollution control.In this study,the multi-layer core-shell structure of SiO_(2)@Ag@SiO_(2)@TiO_(2) was synthesized by different methods as a photocatalyst for pollutant degradation,with oxidation-reduction method,modified Stöber method and hydrothermal method in turn.Effect of silver nitrate(AgNO_(3)),tetraethyl orthosilicate(TEOS)and tetrabutyl titanate(TBOT)on the coating effect were discussed.Microstructure,phase structure,pore structure parameters and photoelectrical properties of SiO_(2)-based multi-layer core-shell structure were systematically analyzed by various characterization methods while its degradation perfo-rmance of methylene blue(MB)was also studied and discussed.The results show that when the mass ratio of AgNO_(3),TEOS and TBOT to SiO_(2) is 5:2.4:6:1,each layer of the multi-layer cored shell structure achieves the optimal coating effect.Compared with SiO_(2)@TiO_(2) and SiO_(2)@Ag@TiO_(2),the core-shell structure of SiO_(2)@Ag@SiO_(2)@TiO_(2) photocatalyst has the best photocatalytic activity.Its photocatalytic degradation efficiency is close to 93%after simulated visible light irradiation for 45 min,and degradation efficiency keeps at 90%after 4 cycles of recycling tests.

关 键 词：核壳结构 光催化 二氧化钛 亚甲基蓝 

分 类 号：TB333[一般工业技术—材料科学与工程]