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- W2353296951 abstract "Preparation of activated carbons from peanut shells and removal of Cr(VI) from aqueous solution by the activated carbons were studied in this article.Chemical agents,H3PO4,ZnCl2,KOH and H2SO4 were used to activate the peanut shell carbon.The effects of activating agents,their concentrations and amounts,pyrolysis time and temperature,on the performance of the activated carbons were investigated.Adsorption experiments of methylene blue were adopted to evaluate the performance of the activated carbons.The results show that H3PO4 and Zn-Cl2 are excellent activating agents but NaOH and H2SO4 are poor ones.The solution pH has considerable influence on the adsorption of Cr(VI) onto the activated carbons.Adsorption capacity of the carbons increases with pH decreasing.Adsorption rate of the carbons differ at different pH as well.The lower the pH,the faster the Cr(VI) adsorption.Isotherm experiments show that Cr(VI) adsorption capacity of the carbons activated by H3PO4 and ZnCl2 reach to 125.0 and 83.3 mg·g-1 at pH 2,respectively.The results can only be modeled by Langmuir isotherm at pH 2,and by Freundlich isotherm at pH 2 and 7,which means that the mechanism of Cr(VI) adsorption is complex and related with solution pH." @default.
- W2353296951 created "2016-06-24" @default.
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- W2353296951 date "2009-01-01" @default.
- W2353296951 modified "2023-09-26" @default.
- W2353296951 title "Removal of chromium from aqueous solution by activated carbon made from peanut shells" @default.
- W2353296951 hasPublicationYear "2009" @default.
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