Preparation and Photocatalytic Performance of TiO2-CNTs Composite Photocatalyst
A composite photocatalyst of TiO2-CNTs was synthesized by adopting the sol-gel method and ultrasonic dispersion,and then its activity in the photocatalytic reduction of CO2 was tested.With a load capacity of carbon nanotubes(CNTs)at 0.75%,the TiO2-CNTs present a better performance in photocatalytic CO2 reduction.Under UV irradiation with wavelength of 365 nm,the average yield of CH4 and CO from the composite catalyst are enhanced by 90%and 156%respectively,compared to the usage of single TiO2 catalyst.It is believed that the reaction is based on the following mechanisms:CNTs,as a co-catalyst,forms a compact electron transport structure with semiconductor of TiO2,which significantly accelerates the transfer of photogenic carriers and reduces the electron-cave recombination efficiency.In addition,high specific surface area and excellent adsorption performance of CNTs can increase active sites for reaction,thus improving efficiency of photocatalytic reduction of CO2 by the catalyst.
NETL
NSTL
万方数据
