Study of Metal Ions Removal from Aqueous Solution by Using Radiation Crosslinked Chitosan‐co‐Poly(Acrylamide)‐Based Adsorbent

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Abstract
Summary: A series of hydrogels as heavy metals adsorbent were prepared from chitosan and acrylamide by gamma irradiation at room temperature. Chitosan solutions with different concentration (1%, 2%, 3%) (w/v) have been mixed with 7.5% (w/v) of acrylamide and irradiated at doses of 10‐40 kGy. The properties of the prepared hydrogel of chitosan‐co‐poly(acrylamide) (Chi‐co‐PAAm) were evaluated in terms of the gel fraction and degree of swelling. It was found that the incorporation only 3% (w/v) chitosan with 7.5% (w/v) acrylamide can produces an elastic hydrogel when irradiated with gamma rays up to 15 kGy. Batch adsorption experiments were carried out to study heavy metals ions removal from its aqueous solutions. The different parameters effecting on the adsorption capacity such as contact time, pH of the solution, hydrogel dose, initial metal ion concentration, and competitive ions were investigated. The results indicated that the ions uptake performance of the hydrogel significantly changed with all the parameter tested. However, Chi‐co‐PAAm hydrogel demonstrated a great uptake ability for heavy metal ions. The order of heavy metal ions uptake on Chi‐co‐PAAm hydrogel was Zn2+ > Cr6+ > Pb2+ > Cu2+ > Co2+ > Ni2+. The Freundlich and Langmuir adsorption isotherms models were applied to describe the isotherms and isotherm constants the adsorption data obtained in this study.

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