Adsorption Of Cd2+ In Aqueous Solutions Using Kmno4-Modified Activated Carbon Derived From Astragalus Residue
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA(2018)
摘要
Activated carbon obtained from Astragalus residue was chemically activated by KOH and modified with KNInO4. The samples were characterized by N-2 adsorption, Fourier transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and Boehm titration. Accordingly, the original and modified carbon materials were used for the removal of Cd2+ from aqueous solution by batch adsorption experiments. Results showed that the contents of oxygen-containing functional groups increased, and MnO2 was nearly uniformly deposited on the surface of activated carbon after modification by KMnO4. The adsorption kinetics was described by pseudo-second order model. Langmuir model fitted the adsorption-isotherm experimental data of Cd2+ better than the Freundlich model. The maximum adsorption capacities of the activated carbon before and after modification for Cd2+ were 116.96 and 217.00 mg/g, respectively. KMnO4 considerably changed the physicochemical properties and surface texture of activated carbon and enhanced the adsorption capacity of activated carbon for Cd2+.
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关键词
Astragalus residue,activated carbon,modification,adsorption,Cd2+
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