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Author(s): |
Deyi Zhang, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China ;State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
Ying Ma, State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
Huixia Feng, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China
Yi Wang, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China ;State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
Yuan Hao, State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract: |
A novel nonporous carbonaceous adsorbent derived from sucrose was proposed for the removal of Cr(VI) from solutions. The adsorption characteristics of Cr(VI) onto the prepared adsorbent in aqueous solutions was investigated at different experimental conditions. The results showed that the solution pH and ionic strength play a significant role in the adsorption of Cr(VI) onto the prepared adsorbent. The adsorption isotherms of the adsorption were found to correspond to type II isotherm according to IUPAC classification and the adsorption kinetics followed the pseudo-second-order kinetic model. Activation thermodynamic parameters, such as activation enthalpy (△H*), activation entropy (△S*), activation Gibbs energy (△G*) and activation energy (Ea), were calculated, and the low value of Ea (9.95 kJ/mol) and △H* (7.39 kJ/mol) indicated that the adsorption is physical and endothermic process. The possible adsorption mechanism also was proposed.
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