A new resin embedded with chelating motifs of biogenic methionine for the removal of Hg(II) at ppb levels

[Display omitted] •A novel resin embedded with metal chelating methionine residues was synthesized.•The resin imparted remarkable efficacy to remove Hg(II) to ppb levels.•The resin showed excellent ability to remove various metal ions from wastewater. Cyclopolymerization of N,N-diallylmethionine hyd...

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Bibliographic Details
Published in:Journal of hazardous materials 2018-05, Vol.350, p.169-179
Main Authors: Ali, Shaikh A., Mazumder, Mohammad A.J.
Format: Article
Language:English
Subjects:
Chelating resin
Cyclopolymerization
Hg(II) removal
Methionine
Wastewater
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Summary:[Display omitted] •A novel resin embedded with metal chelating methionine residues was synthesized.•The resin imparted remarkable efficacy to remove Hg(II) to ppb levels.•The resin showed excellent ability to remove various metal ions from wastewater. Cyclopolymerization of N,N-diallylmethionine hydrochloride, derived from the biogenic amino acid methionine, (90 mol%) and cross-linker tetraallylpiperazinium dichloride (10 mol%) in presence of an azo-initiator afforded pH-responsive cross-linked polyzwitterion (CPZ). The structural morphology of the resin (i.e. CPZ) was examined by the BET and FESEM-EDX analyses. The methionine embedded resin demonstrated remarkable efficacies for the removal of Hg(II) ions at ppb levels. A 50 mg-dose of the resin immersed in aqueous medium (18 mL) could reduce the concentration of Hg(II) from 200 and 400 ppb to 1.8 and 4.4 ppb, respectively, within 15 min. The resin has also proven to be remarkably effective in the removal of several toxic and priority metal pollutants from industrial wastewater. The Hg(II) adsorption followed pseudo second-order process with Ea of 48.1 kJ mol−1. The initial rapid adsorption of metal ions and subsequent slower adsorption was attributed to film and intraparticle diffusion, respectively. The SEM-EDX analyses revealed the attachment of Hg(II) ions onto the resin. The favorability of the endothermic adsorption was ensured by the negative ΔGº values. The efficient adsorption/desorption process confirmed the recyclability of the resin. The current resin demonstrated superior metal removal capacities as compared to several other adsorbents in recent works.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2018.02.033