Adsorption Characteristics of CrVI onto a Novel Nonporous Carbonaceous Adsorbent Derived from SucroseReport as inadecuate




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A novel nonporous carbonaceous adsorbent derived from sucrose was proposed for the removal of CrVI from solutions. The adsorption characteristics of CrVI 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 CrVI 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.

KEYWORDS

Nonporous carbonaceous adsorbent, Sucrose, CrVI, Adsorption

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Author: Deyi Zhang, Ying Ma, Huixia Feng, Yi Wang, Yuan Hao

Source: http://www.scirp.org/



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