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Adsorption Properties of Graphite Oxide for p-Nitrophenol |
ZHA Fei, ZENG Huichong, CHANG Yue |
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China |
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Abstract: The graphite oxide was prepared from the powdered graphite via the Hummers method. It was characterized by the methods of the FT-IR, the XRD and the SEM. It is shown that the graphite oxide contains various oxygen-containing functional groups such as C—OH, —COOH and C—O—C, which increase the layer spaces. Adsorption experiments indicate that the graphite oxide has an outstanding adsorption ability for the p-nitrophenol. With the adsorption temperature at 298 K and the pH value at 7.0, the adsorptive capability of the graphite oxide is up to 80.69 mg/g, 6.1 times of that of the graphite powder. From the adsorption isotherms and thermodynamic functions, it is shown that the adsorption can be described by the Langmuir isothermal equation and is a spontaneous and exothermic process. The kinetic study shows that the adsorption can be fitted by second-order dynamic equations.
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Received: 16 September 2013
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