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- W3048358518 abstract "Amine groups can play significant roles in modified chitosans for adsorption of heavy metal ions. A novel chitosan modified adsorbent (GMCS) grafted with lots of amine groups was synthesized by using glutaraldehyde as a crosslinker between chitosan and melamine. The structure and morphology of GMCS was characterized using FT-IR, 13C NMR, elemental analysis, XRD, TGA, SEM, BET and zeta potential analysis. The adsorption of GMCS and chitosan for different heavy metal ions was compared. The results indicated that GMCS had higher selectivity and uptake for adsorption of Pb2+ and Hg2+ than chitosan. Effects of some variables for uptakes of Pb2+ and Hg2+ on GMCS were studied. The kinetic and isothermal results showed that the adsorption followed the pseudo-second-order kinetic and Langmuir isotherm models. The adsorbent had highest adsorption capacity of 618.2 mg/g and 490.7 mg/g at pH 5 and 6 for Pb2+ and Hg2+, respectively. The adsorption was an endothermic and spontaneous chemical process. Five cycled experiments of adsorption-desorption showed that the adsorbent could be efficiently regenerated." @default.
- W3048358518 created "2020-08-13" @default.
- W3048358518 creator A5025014474 @default.
- W3048358518 creator A5071962049 @default.
- W3048358518 date "2020-11-01" @default.
- W3048358518 modified "2023-10-11" @default.
- W3048358518 title "Selective adsorption of Pb(II) and Hg(II) on melamine-grafted chitosan" @default.
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- W3048358518 doi "https://doi.org/10.1016/j.ijbiomac.2020.08.070" @default.
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