Preparation And Application Of Metal/Non-metal Modified Titanium-based Photocatalyst

TiO₂ has attracted wide attention in the field of photocatalysis due to its characteristics of good photochemical stability and low ecotoxicity.However,the application of TiO₂ in practice is limited by its small specific surface area and narrow absorption range.This study aims to prepare high performance titanium dioxide photocatalyst with high specific surface area and wide absorption wave range by means of structure regulation and surface modification.The specific experimental contents are as follows:1)The TiO₂ microspheres with core-shell structure were synthesized by using SiO₂ as a hard template,and the SiO₂ template was removed by lye to prepare a hollow structure TiO₂ photocatalyst.A series of catalysts were studied for the degradation process of acid red.The effect of the catalyst on the photocatalytic activity was investigated by changing the calcination temperature and life of the catalyst.And the catalyst preparation process was optimized.In the process of preparing hollow structure TiO₂ microspheres,when the calcination temperature is 450°C,the calcination time is 4 h,and the hydrothermal temperature is 120°C,the catalyst exhibits good degradation performance under acidic light for acid red;The degree of visible light response of the photocatalyst was modified by Au in the hollow structure TiO₂ microspheres,and the process of catalytic degradation of acid red by Au@TiO₂ was optimized.When the catalyst dosage is 100 mg and the substrate concentration is 100 mg·L^-1,the degradation efficiency of the catalyst for 3h of acid red under visible light reaches 60%or more.2)The honeycomb C-TiO_2-x was prepared by template synthesis method,and the preparation process of the catalyst was optimized by response surface methodology.In the process of preparing honeycomb type C-TiO_2-x,when the calcination temperature is 450°C,the calcination time is 5h,the hydrothermal temperature is 130°C,and the hydrothermal time is 2h,the catalyst exhibited better degradation performance for AR3R under under visible light.In order to further improve the visible light response of the photocatalyst,the honeycomb type C-TiO_2-x was doped with Au,and the process of catalytic degradation of acid red by Au@C-TiO_2-x was optimized.When the catalyst dosage is 100mg and the substrate concentration is 100mg·L^-1,the degradation efficiency of the catalyst for 2h of AR3R is more than 70%under visible light.The catalytic life of Au@C-TiO_2-x was tested,Au@C-TiO_2-x still maintained good catalytic performance after five cycles of use.3)The hollow type?-Fe₂O₃/C@TiO₂ catalyst was prepared by template synthesis method,and the photocatalytic performance of the catalyst was evaluated by 20mg·L^-1phenol solution as the target pollution.In the process of preparing?-Fe₂O₃/C@TiO₂,when the calcination temperature is 450°C and the calcination time is 4 h,the catalyst exhibited good degradation performance for phenol solution under visible light.;The catalytic life of?-Fe2O3/C@TiO2 was tested,?-Fe2O3/C@TiO2 still maintained good catalytic performance after five cycles of use;The phenol degradation process of the catalyst was studied in depth,and the?-Fe₂O₃/C@TiO₂ degradation of phenol was obtained.