Hydrothermal synthesis,characterization,and photocatalytic performances of Cr incorporated,and Cr and Ti co-incorporated MCM-41 as visible light photocatalysts for water splitting

摘要

A series of Cr incorporated,and Cr and Ti co-incorporated MCM-41 photocatalysts were synthesized by hydrothermal method.X-ray diffraction (XRD),UV-vis diffuse reflectance spectra (UV-vis),Fourier transform infrared spectroscopy (FTIR),X-ray fluorescence analysis (XRF) N2 adsorption-desorption isotherms and Raman spectra were used to investigate the effects of the incorporated elements on the structure of MCM-41.The experimental results for photocatalytic water splitting under visible light irradiation (lambda >430nm) demonstrated that the photocatalytic activities of Cr-MCM-41 and Cr-Ti-MCM-41 catalysts for hydrogen production decreased with an increase in the amount of Cr incorporated.Compared with the Cr-MCM-41 which had the same amount of incorporated Cr,the Cr-Ti-MCM-41 exhibited much higher hydrogen evolution activities.