TiO2/Fe/Ag3PO4 Composite Photocatalyst for the Degradation of RhB
TiO2 is a general semiconductor photocatalyst to remove environmental contaminants for its chemical prop-erties,safety,and non-toxic.However,TiO2 has wide bandgap,low absorption in visible light region.Since the UV light energy is less than 5％of the solar energy,most of the solar energy can not be absorbed,which restricts the ap-plications of TiO2 on photocatalytic degradation for contaminants.To address the issue,Fe and Ag are doped to pre-pare composite TiO2 microspheres which had lower band gap energy than pure TiO2 to enhance the absorption of the solar spectrum.By the sol-gel method,the element content of Fe is changed to prepare 5 different samples and fitted the optimal ratio.Then Ag is loaded into the microspheres by Ag3PO4.The composite TiO2/Fe/Ag3PO4 micro-spheres were prepared.50 mL of 10 mg/L RHB solution is configured to test the photocatalytic degradation of 5 samples under the xenon lamp.All the degradation rates can reach over 90％in 1 h.When the proportion of Fe atoms was 5％,the sample shows an excellent photo catalytic degradation activity.The degradation rate was 99％at 30 min while the samples were characterized by XRD、SEM、XPS、DRS、PL.When Fe is 5％doped,the band gap of compos-ite TiO2 microspheres is 2.85 eV which absorbs the visible light and improves the optical properties.
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