Efficient
Gold Recovery from E‑Waste via a
Chelate-Containing Porous Aromatic Framework
Version 2 2020-06-26, 12:06Version 2 2020-06-26, 12:06
Version 1 2020-06-26, 10:44Version 1 2020-06-26, 10:44
Posted on 2020-06-26 - 12:06
Extracting
gold from wastes of electronic equipment (e-waste) is
a sustainable strategy for the recovery of the precious metal, reducing
environmental pollution, and addressing the growing demands for gold
resources. In this work, we synthesized a thiourea-modified porous
aromatic framework (PAF-1-thiourea) with exceptional gold-extraction
ability. The optimum adsorption capacity for PAF-1-thiourea to gold
reaches up to 2629.87 mg g–1. The adsorption process
can be well fitted according to the pseudo-second-order kinetic model
and Langmuir model, featuring strong affinity caused by strong soft–soft
interactions between Au(III) and the S and N donor atoms of the modified
PAF and the electrostatic interactions between protonated amino groups
and AuCl4–. PAF-1-thiourea was especially
capable of extracting gold rapidly and efficiently (capturing 98.73%
of gold within 5 min) from a central processing unit (CPU) in extremely
acidic conditions. It is found that PAF-1-thiourea captures gold ions
and simultaneously converts it to a Au(0) solid, obtaining gold with
purity up to 23.5 karat. PAF-1-thiourea with its high acid resistance
and anti-interference against cheap metals in the recovery process
presents a practical means to extract gold from e-waste.
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Ma, Tingting; Zhao, Rui; Li, Zhangnan; Jing, Xiaofei; Faheem, Muhammad; Song, Jian; et al. (2020). Efficient
Gold Recovery from E‑Waste via a
Chelate-Containing Porous Aromatic Framework. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c08352