Silver recovery as Ag^0 nanoparticles from ion-exchange regenerant solution using electrolysis

作     者：Tabish Nawaz Sukalyan Sengupta Chen-Lu Yang 

作者机构：Civil and Environmental Engineering DepartmentUniversity of Massachusetts Dartmouth Center for Innovation and EntrepreneurshipUniversity of Massachusetts Dartmouth 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2019年第31卷第4期

页      面：161-173页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：University of Massachusetts Lowell University of Massachusetts, UMASS University of Massachusetts Dartmouth, UMass Dartmouth or UMassD 

主　　题：Silver recovery Ag^0 nanoparticles Waste management Thiourea Sustainability Resource recovery Electrowinning 

摘      要：Many silver(Ag)containing consumer-products(***)release Ag into the environment,posing ecotoxicological *** recovery mitigates environmental hazards,recycles Ag,and leads to *** the present work,Ag has been recovered as Ag^0nanoparticles from the spent solution(thiourea(TU)～0.5 mol/L pH～1.1–1.2,and Ag～550 mg/L)obtained from the regeneration of an Ag-loaded resin using a simple undivided electrolytic *** reclaimed regenerant solution has been recycled and reused in a closed-loop scheme over multiple *** process parameters,i.e.,current(0.05 A)and stirring speed(600 r/min),have been optimized for Ag recovery of～94%and TU loss of～2%.The reclaimed regenerant solution has been shown to regenerate Ag-loaded resin samples with90%regeneration efficiency over 4 cycles of consecutive extraction and *** recovered Ag^0nanoparticles are monodisperse,consistently spherical in shape,and have a mean diameter of～6 nm with standard deviation of the Gaussian fit as～2.66 nm.