吸附
化学
烷基
质子化
共价键
共价有机骨架
浸出(土壤学)
硫脲
选择性
朗缪尔吸附模型
胺气处理
催化作用
组合化学
无机化学
化学工程
有机化学
离子
工程类
土壤科学
土壤水分
环境科学
作者
Li Zhang,Qiong‐Qing Zheng,Sai Jin Xiao,Jiaqing Chen,Wei Jiang,Wei‐Rong Cui,Guiping Yang,Ru‐Ping Liang,Jian‐Ding Qiu
标识
DOI:10.1016/j.cej.2021.131865
摘要
Recovering precious metals from electronic equipment waste involves significant environmental and economic benefits. In this paper, a covalent organic framework, named as TpTsc COF, was synthesized by using flexible alkyl amine thiosemicarbazide (Tsc) and 1,3,5-triformylphloroglucinol (Tp) as precursors for extracting gold from actual electronic waste. The results show that it has favorable selectivity, high recycling and groundbreaking adsorption capacity (4400.23 mg g−1). Such excellent adsorption capacity can be attributed to the improved crystallinity by irreversible enol-to-tautomerism of Tp, the abundant functional group sites in Tsc, and the efficient reduction of gold by thiourea. The adsorption process can be well fitted with the pseudo-second-order kinetic model and Langmuir mode, which is characterized by the coordination between Au (III) and S, N, O atoms in COF, as well as the electrostatic interaction between protonated amino groups and AuCl4− in acidic system. The advantages of this feasible method facilitate effective gold recovery from low-cost electronic waste.
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