Dual-selective silver recovery strategy by simultaneous adsorption-reduction boosted by in-situ magnetic field  

作　　者：Jianran Ren Zhiliang Zhu Yanling Qiu Fei Yu Tao Zhou Jie Ma Jianfu Zhao 

机构地区：[1]Research Center for Environmental Functional Materials,State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai,200092,China [2]School of Civil Engineering,Kashi University,Kashi,844000,China [3]College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai,201306,China

出　　处：《Green Energy & Environment》2025年第2期433-440,共8页绿色能源与环境(英文版)

基　　金：supported by The National Natural Science Foundation of China(52170087,22276137).

摘　　要：The mainstream silver recovery has problems such as resource waste,weak silver selectivity,and complicated operation.Here,self-propelled magnetic enhanced capture hydrogel(magnetic NbFeB/MXene/GO,MNMGH)was prepared by self-crosslinking encapsulation method.MNMGH achieved high selectivity(K_(d)=23.31 mL/g)in the acidic range,and exhibited ultrahigh silver recovery capacity(1604.8 mg/g),which greatly improved by 66%with the assistance of in-situ magnetic field.The recovered silver crystals could be directly physically exfoliated,without acid/base additions.The selective sieving effect of adsorption,MNMGH preferentially adsorbed Ag(I),and then selectively reduced to Ag(0),realizing dual-selective recovery.The in-situ magnetic field enhanced selective adsorption by enhancing mass transfer,reactivity of oxygen-containing functional groups.Furthermore,density function theory simulations demonstrated that the in-situ magnetic field could lower the silver reduction reaction energy barrier to enhance the selective reduction.Three-drive synergy system(reduction drive,adsorption drive and magnetic drive)achieved ultrahigh silver recovery performance.This study pioneered an in-situ magnetic field assisted enhancement strategy for dual-selective(adsorption/reduction)recovery of precious metal silver,which provided new idea for low-carbon recovery of noble metal from industrial waste liquids.

关 键 词：In-situ magnetic field Silver recovery Adsorption-reduction SELECTIVITY Physical separation 

分 类 号：O64[理学—物理化学]