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Sequential Recovery of Heavy and Noble Metals by Mussel-Inspired Polydopamine-Polyethyleneimine Conjugated Polyurethane Composite Bearing Dithiocarbamate Moieties

1
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2
School of Public Health, Capital Medical University, Beijing 100069, China
3
State Key Laboratory for Comprehensive Utilization of Nickel and Cobalt Resources, Jinchang 737100, China
4
Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food poisoning, Beijing Center for Disease Prevention and Control, Beijing 100013, China
5
Center for Biological Imaging, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(7), 1125; https://doi.org/10.3390/polym11071125
Received: 7 February 2019 / Revised: 18 June 2019 / Accepted: 19 June 2019 / Published: 2 July 2019
(This article belongs to the Special Issue Functional Polyurethanes – In Memory of Prof. József Karger-Kocsis)
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PDF [5048 KB, uploaded 2 July 2019]
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Abstract

Dithiocarbamate-grafted polyurethane (PU) composites were synthesized by anchoring dithiocarbamate (DTC) as a chelating agent to the polyethyleneimine-polydopamine (PE-DA)-functionalized graphene-based PU matrix ([email protected]@PU), as a new adsorbent material for the recovery of Cu2+, Pb2+, and Cd2+ from industrial effluents. After leaching with acidic media to recover Cu2+, Pb2+, and Cd2+, dithiocarbamate-grafted [email protected]@PU ([email protected]@PU) was decomposed and [email protected] was regenerated. The latter was used to recover Pd2+, Pt4+, and Au3+ from the copper leaching residue and anode slime. The present [email protected]@PU and [email protected]@PU composites show high adsorption performance, effective separation, and quick adsorption of the target ions. The morphologies of the composites were studied by scanning electron microscopy and their structures were investigated by Fourier transform infrared (FT-IR) spectroscopy and Raman spectroscopy. The effects of pH values, contact time, and initial metal ion concentration conditions were also studied. An adsorption mechanism was proposed and discussed in terms of the FT-IR results. View Full-Text
Keywords: polyurethane; graphene; metallurgy; polymeric composites; thiocarbamate polyurethane; graphene; metallurgy; polymeric composites; thiocarbamate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xue, D.; Li, T.; Chen, G.; Liu, Y.; Zhang, D.; Guo, Q.; Guo, J.; Yang, Y.; Sun, J.; Su, B.; Sun, L.; Shao, B. Sequential Recovery of Heavy and Noble Metals by Mussel-Inspired Polydopamine-Polyethyleneimine Conjugated Polyurethane Composite Bearing Dithiocarbamate Moieties. Polymers 2019, 11, 1125.

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