Preparation and photodegradation of humic acid by a Y3+-doped ZnO/TiO2 composite

摘要

Aim to remove soluble humic acid (HA) in super-critical boiler make-up water,Y3+-doped ZnO/TiO2 composites were prepared using a solid-phase synthesis method,Their properties were characterized by x-ray diffraction,transmission electron microscopy,and UV-visible diffuse reflection spectroscopy (DRS); their visible light photoactivities were evaluated by the photodegradation of humic acid in an aqueous solution under sunlight irradiation..The experiment results showed that Y3+-doped samples had a higher absorbance than pure TiO2,and a red shift appeared in the DRS spectrum; The Y3+-doped ZnO/TiO2 multiplex nanocomposite can expand the wavelength range for light absorption and increase the sunlight utilization efficiency.Samples with 3％ y3+ and 27％ ZnO have the highest photoactivities.