Effect of Surface Hydrophilicity on the Desulfurization Performance of ZnO/SiO_2 Composite

摘要

Two kinds of ZnO/SiO2 composite (labled as SZ-1 and SZ-2) were synthesized by sol-gel method and characterized by X-ray diffraction (XRD) patterns, XPS (X-ray photoelectron spectroscopy) spectra and Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectra. Water adsorption on the prepared sample was studied by in situ DRIFT. The as-synthesized SZ-1 and SZ-2 sample have different surface property due to the various aging methods in the sample preparation processes, thus showing different results of water adsorption. The adsorption sites (Si atom in Si-O-Si bond) on the surface of SZ-2 for water molecule are occupied by the -OCH3 group and the hydrophilicity of SZ-2 is weaker, in comparison to SZ-1, which inhibits the formation of water film and ultimately decreases desulfurization performance of SZ-2. So, the desulfurization performance can be changed by altering the hydrophilicity of sorbent.