Adsorption of Dibenzothiophene on Ag/Cu/Fe-Supported Activated Carbons Prepared by Ultrasonic-Assisted Impregnation

摘要

This work is mainly involved with study of the adsorption of dibenzothiophene (DBT) on Ag/Cu/Fe-supported activated carbons (ACs) prepared by ultrasound-assisted impregnation (UI). Ag/AC-UI, Cu/AC-UI, and Fe/AC-UI were separately prepared by using impregnation of different metal salt solutions under ultrasound irradiation (Ulr) and characterized by X-ray photoelectron spectroscopy (XPS) and COchemisorption experiments. Isotherms of DBT on the modified ACs were separately measured, and the effects of different metal ions loaded on the ACs on the amount of adsorbed DBT on the modified ACs are discussed. Results indicated that (1) the DBT adsorption capacity of the ACs modified by using impregnation without Ulr followed the order: Ag/AC > Cu/ AC > AC > Fe/AC; (2) the modification methods have significant influence on the adsorption abilities of the modified ACs toward DBT. The application of Ulr to prepare metal ion-impregnated ACs can make the metallic particles on the carbon surfaces become finer and disperse better in comparison with the use of impregnation only. As a consequence, the Ag/AC-UI and Cu/AC-UI prepared by using the Ulr have higher adsorption capacities of DBT than the Ag/AC and Cu/AC prepared using impregnation.