巯基化活性炭靶向捕获电子废弃物酸浸液中金离子  

Potential-dependent selectivity for the efficient capture of gold from E-waste acid leachate using sulfhydryl-functionalized carbon

作　　者：李敏 姚子威 陈以頔 李德伟 邵家创 董浩 孟竹 杨利明 任伟 罗旭彪 邵鹏辉 Min Li;Ziwei Yao;Yidi Chen;Dewei Li;Jiachuang Shao;Hao Dong;Zhu Meng;Liming Yang;Wei Ren;Xubiao Luo;Penghui Shao(Department of Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization,Nanchang Hangkong University,Nanchang 330063,China;State Key Laboratory of Urban Water Resource and Environment,School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)

机构地区：[1]Department of Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China [2]National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization,Nanchang Hangkong University,Nanchang 330063,China [3]State Key Laboratory of Urban Water Resource and Environment,School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

出　　处：《Science Bulletin》2023年第11期1095-1099,M0003,共6页科学通报（英文版）

基　　金：the National Natural Science Foundation of China(52125002);the Research Program of Chongqing Municipal Education Commission(KJZD-K202101502);the Natural Science Foundation of Jiangxi Province(20224ACB203015)。

摘　　要：电子废弃物中回收金兼具污染治理、资源循环双重目的,是环境高水平保护、经济高质量发展的必要要求.吸附法是湿法回收金属资源的有效方法,但含金电子废弃物的浸出液都呈现强酸性和强氧化性;目前从该体系中靶向捕捉金离子仍存在巨大挑战.本文报道了一种巯基功能化的秸秆基活性炭,在强酸、强氧化性体系中实现了金离子的靶向捕获,其最大吸附容量可达5309 mg/g,选择性系数达到1.21×10^(6);吸附后的材料经煅烧得到金单质,其纯度高达99.9%.机理研究表明,巯基电位选择性诱导金离子优先还原,并促发了吸附-还原过程自发进行.由于量子尺寸效应,被还原的金簇在炭材料表面积累,处于“激发状态”的纳米金簇,将进一步诱导还原体系中金离子,呈现一种自促进作用.研究实现了复杂苛刻酸浸液中金元素的靶向回收,为电子废弃物高质循环利用提供了新思路.Gold(Au)possesses wide applications in electronics because of its superb physical and chemical properties.Waste printed circuit boards(WPCBs),an important part of electronic waste(E-waste),are also known as an“urban mine”because they have a much higher Au content than Au ore[1].Hence,the recovery of Au from WPCBs has been demonstrated to be of vital importance to the economy and environment[2].Currently,the industry has developed pyrometallurgy,cementation,solvent extraction,ion exchange,and acid leaching to treat WPCBs,with acid leaching serving as the primary approach[3].Among the different recovery technologies,the adsorption approach to recovering Au from WPCBs acid leachate has been deemed promising[4].The core of adsorption technology is the design of adsorbent sites.

关 键 词：电子废弃物 强氧化性 污染治理 资源循环 循环利用 选择性系数 量子尺寸效应 金离子 

分 类 号：X705[环境科学与工程—环境工程] TF831[冶金工程—有色金属冶金]