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In relation to this article, we declare that there is no conflict of interest.
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Received February 4, 2022
Accepted June 12, 2022
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Enhanced adsorption of lead ions by enzymatically synthesized poly(m-phenylenediamine)-graphene oxide composites

Department of Chemical Engineering, College of Engineering, University of Ulsan, Ulsan 44610, Korea 1School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
Korean Journal of Chemical Engineering, November 2022, 39(11), 3048-3054(7), 10.1007/s11814-022-1207-z
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Abstract

Adsorption is considered efficient for removing metal ions dissolved in aquatic environments. For the successful performance of adsorption processes, the development of adsorbents possessing high adsorption capacity is essential. Herein, we report the enzymatic synthesis of composites consisting of m-phenylenediamine polymer (pmPDA) and graphene oxide (GO) by laccase and the adsorption properties of these composites for Pb2+, a representative toxic metal ion. Especially, the composite synthesized with initial 1 : 1 mass ratio of m-phenylenediamine monomer and GO was found to have the largest adsorption capacity for Pb2+. The Langmuir isotherm for the adsorption of Pb2+ by GO, pmPDA, and this composite, respectively, revealed that the maximum adsorption capacity, qmax, of this composite was the highest (2,164 μmol/g) being almost four times higher than that for pmPDA (564.7 μmol/g). The qmax for GO was 984.3 μmol/g being about two times higher than for pmPDA but less than a half of qmax for this composite. The composite was estimated to contain 56.1 wt% of pmPDA as examined by thermogravimetric analysis. This study demonstrates that the combination of the high surface area of GO and the functionality of pmPDA can significantly enhance the adsorption capacity for Pb2+.

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