Abstract
In this study, a biosorbent prepared by sulphuric acid modified waste biomass was used to adsorb and enrich Ag+ from industrial wastewater. The Ag+ was converted into Ag(NH3)2+ according to the different chemical properties of the ions, as a way to improve the selective adsorption of Ag+ on the biosorbent. Response surface methodology was used to obtain the optimised modification conditions as follows: modification time was 4 h, modification temperature was 368.15 K and sulphuric acid concentration was 85 mass %. Porous structure and chemical functional groups of biosorbent were studied. The analysis of adsorption isotherms indicates that the adsorption process may be an irreversible heterogeneous chemical adsorption process, and the adsorption kinetics of biosorbent on Ag(NH3)2+ conform to the pseudo-second-order kinetic model. The redox mechanism of Ag(NH3)2+ adsorption was postulated based on characterisation analysis. The competitive adsorption experiments showed that the biosorbent had selective adsorption for Ag(NH3)2+ due to redox reaction, and the adsorption capacity of the biosorbent on Ag(NH3)2+ was 1285 mg g−1, which indicates that it has good prospects for application in recovery of Ag(I) from liquid waste resources in the future.
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