Abstract
A novel ternary Ag/TiO2/clinoptilolite (ATC) nanocomposite was synthesized via a two-step synthesis strategy by combining the hydrothermal and in-situ reduction process. The obtained samples were characterized by a series of methods of XRD, SEM, TEM, N2 adsorption-desorption isotherms, XPS, FTIR, and UV-vis DRS. It is revealed that Ag and TiO2 nanoparticles were tightly bonded with the clinoptilolite and well-dispersed on its surface. Xanthates were employed as the target pollutants to evaluate the photodegradation efficiency of the as-synthesized samples. Particularly, the ATC photocatalyst exhibited an improved visible-light-induced photodegradation performance towards xanthates, which was much superior to those of binary Ag/TiO2 and Ag/clinoptilolite nanocomposites. The key influencing factors were also investigated to obtain optimal degradation conditions. The excellent photocatalytic performance of the ATC nanocomposites mainly benefited from the enlarged adsorption capacity, visible-light absorption region, and charge separation efficiency. The possible photodegradation mechanism was proposed according to the results of real-time spectral evolution, trapping experiment, and UV-vis DRS.
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