Radiation Preparation of Amino Acid-Functionalized Loofah and Its Adsorption Performance to Pb(Ⅱ)
Using agricultural and forestry waste loofah as a substrate,we grafted polyglycidyl methacrylate(PGMA)onto the surface of loofah fiber by an electron beam radiation grafting method,introduced functional groups of lysine(Lys)and arginine(Arg)by ring-opening reaction,and prepared two kinds of amino acid-func-tionalized loofah LC-PGMA-Lys and LC-PGMA-Arg.Moreover,we characterized LC-PGMA-Lys and LC-PG-MA-Arg by FTIR,elemental analysis,XRD,and SEM.Furthermore,we systematically studied the effects of ini-tial pH value,adsorption time,adsorption temperature,and initial concentration of Pb(Ⅱ)on the adsorption ca-pacity of Pb(Ⅱ),and investigated the adsorption behavior to Pb(Ⅱ).The results show that the optimum initial pH value of LC-PGMA-Lys and LC-PGMA-Arg for the adsorption of Pb(Ⅱ)is 6.The maximum adsorption ca-pacity of LC-PGMA-Lys for Pb(Ⅱ)is 71.18 mg·g-1 under the optimum conditions as follows:the initial pH value of 6,the adsorption time of 200 min,and the adsorption temperature of 35 ℃.The adsorption process of Pb(Ⅱ)by LC-PGMA-Lys conforms to the pseudo-second-order kinetic equation and Freundlich isothermal adsorption model,indicating that the adsorption process is dominated by multimolecular layers and chemisorption.
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