Fe_(3)O_(4)@TiO_(2)@SiO_(2)@Ag光催化剂的制备及其光催化活性研究

Preparation and Photocatalytic Activities of FeO@TiO@SiO@Ag

采用溶剂热法和溶胶-凝胶法合成了磁性Fe_(3)O_(4)@TiO_(2)@SiO_(2)复合光催化剂,再通过巯基改性,使二氧化硅表面原位合成银纳米颗粒,最终形成目标光催化剂。利用XRD、FT-IR、XPS、SEM、VSM等分析测试手段对该催化剂的组成、结构、形貌及其磁学性能进行表征。通过光催化降解40 mL罗丹明B溶液(pH 5.3,30 mg/L),催化剂按1 g/L加入反应体系,光照120 min时,罗丹明B溶液的降解率达96.22%。相同条件重复循环实验10次,罗丹明B溶液降解率仅下降4.32%,表明Fe_(3)O_(4)@TiO_(2)@SiO_(2)@Ag磁性光催化剂具有出色的光催化活性和循环使用性。

Magnetic Fe_(3)O_(4)@TiO_(2)@SiO_(2) composite photocatalyst was synthesized by solvothermal method and sol-gel method, and then modified by sulfhydryl to support silver nanoparticles which were synthesized in situ on the silica surface.The composition, structure, morphology and magnetic properties of the photocatalyst were confirmed by XRD,FT-IR,XPS,SEM,VSM,etc.Photocatalytic degradation of 40 mL rhodamine B solution(pH 5.3,30 mg/L),the catalyst was added to the reaction system at 1 g/L,the degradation rate of RhB solution was 96.22% under 120 min of light irradiation.Under the same conditions, the degradation rate of RhB solution only decreased by 4.32% after 10 repeated cycles.The magnetic photocatalyst of Fe_(3)O_(4)@TiO_(2)@SiO_(2)@Ag has excellent photocatalytic activity and reusability.