Efficient
Gold Recovery from E‑Waste via a
Chelate-Containing Porous Aromatic Framework
Version 2 2020-06-26, 12:06
Version 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
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AUTHORS (10)
TM
Tingting Ma
RZ
Rui Zhao
ZL
Zhangnan Li
XJ
Xiaofei Jing
MF
Muhammad Faheem
JS
Jian Song
YT
Yuyang Tian
XL
Xijuan Lv
QS
Qinghai Shu
GZ
Guangshan Zhu
CATEGORIES
- Biophysics
- Biochemistry
- Physical Sciences not elsewhere classified
- Medicine
- Biotechnology
- Environmental Sciences not elsewhere classified
- Chemical Sciences not elsewhere classified
- Ecology
- Biological Sciences not elsewhere classified
- Information Systems not elsewhere classified
- Science Policy
- Hematology
- Infectious Diseases
- Virology