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Adsorptive removal of heavy metal ions in water using poly(m-phenylenediamine) synthesized by laccase

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Abstract

The polymer of m-phenylenediamine (poly(m-PDA)) which was synthesized by mild laccase catalysis in an aqueous buffer (10 mM citrate phosphate, pH 3) was investigated for the adsorption of several heavy metal ions including Pb2+, Cu2+, Co2+, and Cr3+. In the preliminary study for the adsorption of Pb2+ by poly(m-PDA), the adsorbed amount of Pb2+ was strongly influenced by solution pH being the highest in distilled water and decreased as solution pH was lowered from 5 to 2. The adsorption isotherms of the four heavy metal ions on poly(m-PDA) were well described by Langmuir equation. Poly(m-PDA) shows high maximum adsorption capacities (qmax) for Cu2+, Pb2+, and Cr3+ with the values of 556, 526, and 476 μmol g−1, respectively. This study proposes that the synthesis of polymeric absorbents to remove heavy metal ions from water can be accomplished through simple and environmentally friendly enzymatic methods.

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Acknowledgements

This work was financially supported by the faculty research grant from the University of Ulsan, Korea (2017-0170).

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Correspondence to Keungarp Ryu.

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Xu, Y., Yoo, IK., Lee, H. et al. Adsorptive removal of heavy metal ions in water using poly(m-phenylenediamine) synthesized by laccase. Chem. Pap. 73, 1705–1711 (2019). https://doi.org/10.1007/s11696-019-00723-y

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  • DOI: https://doi.org/10.1007/s11696-019-00723-y

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