Iranian Journal of Chemistry

Iranian Journal of Chemistry

Study of adsorption of cationic Cu2+ on starch-poly (Am-co-AA)/GO bio-nanocomposite hydrogels

Document Type : Original Article

Authors
Bahaaldin Rashidzadeh
Ebrahim Shokri
Zahra Salehi
chemistry department- facultu of science baneh kordestan iran
10.22036/ijc.2020.159506.1046
Abstract
This project studies the absorption and removal of copper cations from aqueous solutions by starch-poly (acry-lamide-co-acrylic acid) / graphene oxide hydrogel bio-nanocomposites. The bio-nanocomposite hydrogel was obtained from a radical polymerization of the starch biopolymer with vinyl acrylamide (Am) and acrylic acid (AA) monomers with N,N-methylenebisacrylamide (MBA) in the presence of graphene oxide nanosheets (GO). The bio-nanocomposites were investigated by XRD, FT-IR, FE-SEM, TEM and TGA techniques. The effect of pH on adsorption, effects of time on adsorption, the initial concentration of copper ions and effect of temperature on the adsorption process on copper ions were investigated. The results which obtained from the experiments on the removal and absorption of copper ions were shown the maximum adsorption at pH =5 / 5, the adsorption increased by increasing the time, the equilibrium adsorption process flowed by Langmuir isotherm model and according to thermodynamic parameters, the adsorption of Cu2+ on bio-nanocomposite hydrogels occurred endothermic process and spontaneously, respectively. Also, the amount of adsorption increases proportionally to the amount of GO. Additionally, because of the enthalpy of absorption between 20-80 (KJ / mol), as a result, the process of removal is an electrostatic process
Keywords
Bio-nanocomposite hydrogels
Graphene Oxide Nano sheets
removal of copper cations
Starch
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Iranian Journal of Chemistry
Volume 3, Issue 1 - Serial Number 4
September 2020
Pages 41-51

  • Receive Date 11 December 2018
  • Revise Date 25 October 2019
  • Accept Date 24 September 2020