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J Hazard Mater. 2009 Jul 30;166(2-3):1514-21. doi: 10.1016/j.jhazmat.2008.12.080. Epub 2008 Dec 25.

Preparation and characterization of activated carbon from cotton stalk by microwave assisted chemical activation--application in methylene blue adsorption from aqueous solution.

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  • 1Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, Xinjiang, China.


The activated carbon prepared from cotton stalk with ZnCl(2) as activation was investigated under microwave radiation. Effects on the yield and adsorption capacities of activated carbon were evaluated then, such as, microwave power, microwave radiation time and the impregnation ratio of ZnCl(2). It indicated that the optimum conditions were as follows: microwave power of 560 W, microwave radiation time of 9 min and the impregnation ratio of ZnCl(2) was 1.6g/g. Iodine number, amount of methylene blue adsorption and the yield of activated carbon prepared under optimum conditions were 972.92 mg/g, 193.50mg/g and 37.92%, respectively. Laboratory prepared activated carbons were characterized by pH(ZPC), SEM, FT-IR, S(BET) and pore structural parameters. Then they were used as adsorbent for the removal of methylene blue from aqueous solutions under varying conditions of initial concentration, carbon dosage and pH. It indicated that Langmuir isotherm was fitter than Freundlich isotherm and Temkin isotherm.

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