期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131865
关键词
Flexible alkyl amine; Covalent organic frameworks; High capacity; Gold recovery; E-waste
资金
- National Natural Science Foundation of China [21964011, 22064001, 22036003, 21976077, 21775065]
- Natural Science Foundation of Jiangxi Province [2018ACB21008]
This paper presents a method for extracting gold from electronic waste by synthesizing a covalent organic framework, which has high recovery rate and adsorption capacity, and is beneficial for environmental protection.
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-secondorder 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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