Recovery of Ag+ by cyclic lipopeptide iturin A and corresponding chain peptide: reaction mechanisms, kinetics, toxicity reduction, and applications.

Xixi Zhao, Liangfu Zhou, Xiaoguang Xu, Chongyang Ai, Pengpeng Zhao, Lu Yan, Chunmei Jiang, Junling Shi

The Science of the total environment 2021 Apr 01

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Iturin A, a cyclic lipopeptide produced by Bacillus subtilis, has great potential in removal of Ag+ from water, but the mechanisms and kinetic remain unclear. By comparison with the chain peptide (CP) that has the same amino acid sequence as iturin A, the mechanisms were found as iturin A reduced Ag+ to Ag0 and formed silver nanoparticles (AgNPs) via the groups of Ar-OH, CO, -NH-, O=C-O, and -C(CH).The cycle peptide fraction played an important role for the faster formation of AgNPs by iturin A than by CP. The overall Ag+ removal process by iturin A and CP could be well described by a Freundlich isotherm, with the equilibrium Ag+ removal capacity ranging from 58.41 to 61.03 mg/g within 293.15-333.15 K for iturin A. With the application of iturin A, the overall removal rate of Ag+ reached 91.8% in wastewater, the formed AgNPs could be easily recovered via charging the direct electric current, and the toxicity of Ag+ to paddy growth was greatly reduced. Copyright © 2020 Elsevier B.V. All rights reserved.

Citation

Xixi Zhao, Liangfu Zhou, Xiaoguang Xu, Chongyang Ai, Pengpeng Zhao, Lu Yan, Chunmei Jiang, Junling Shi. Recovery of Ag+ by cyclic lipopeptide iturin A and corresponding chain peptide: reaction mechanisms, kinetics, toxicity reduction, and applications. The Science of the total environment. 2021 Apr 01;763:142988