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Abstract: Abstract: The complex technology of molecular imprinting with a photocatalytic reaction introduces novel ways of treating industrial and living sewage. This paper deals with the effects of trace TiO2 on Ag+-imprinted or non-imprinted adsorbents. NanoTiO2 was added during the preparation of the adsorbents. The performance of these adsorbents was compared with other common adsorbents, such as activated carbon and chitosan. TiO2 loading improved the adsorption ability for Ag+ of adsorbents. Adsorption equilibrium could be rapidly achieved at an initial Ag+ concentration of 200 mg/L under different light conditions (UV, visible light, and dark). After TiO2 loading, the maximal adsorption capacity of Ag+-imprinted and non-imprinted adsorbents was 25.0% higher, at 155.0 and 134.3 mg/g, respectively, at the initial Ag+ concentration of 1,000 mg/L. In order to understand the binding state of Ag, Ti on the adsorbents surface, FTIR, XPS were measured. The FTIR analysis, before and after adding TiO2, indicated that TiO2 bound with adsorbents through hydrogen bonding. XPS analysis, before and after adsorption, indicated Ag+ was reduced to Ag0 on the adsorbent surface, leading to an increased adsorption of Ag+
Author keywords: TIO2, adsorption, Ag+, molecular imprinting, Photocatalysis