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Biosorption of Cr(VI) by carbonized Eupatorium adenophorum and Buckwheat straw: thermodynamics and mechanism |
Jinfa CHEN1,Ping YANG2,*(),Dagang SONG1,Sha YANG1,Li ZHOU1,Lei HAN1,Bo LAI2 |
1. Department of Agricultural Science, Xichang College, Xichang 615013, China; 2. College of Architecture & Environment, Sichuan University, Chengdu 610065, China |
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Abstract High quality and low cost carbon can be prepared from Eupatorium adenophorum (E. adenophorum) and Buckwheat straw. The biosorbent was used for Cr(VI) removal. The effect of experimental parameters, such as pH, sorbent dosage and temperature were examined and the optimal experimental condition was determined. Solution pH is found influencing the adsorption. Cr(VI) removal efficiency is found to be maximum (98%) at pH= 1. Langmuir and Freundlich adsorption isotherms were applicable to the adsorption process and their constants were evaluated. The adsorption data obtained agreed well with the Langmuir sorption isotherm model. The maximum adsorption capacities for Cr(VI) ranged from 46.23 to 55.19 mg·g-1 for temperature between 298 K and 308 K under the condition of pH= 1.0. Thermodynamic parameters such as free energy change (ΔG), enthalpy (ΔH) and entropy (ΔS) indicate a spontaneous, endothermic and increased randomness nature of Cr(VI) adsorption. Studies found that the raw E. adenophorum and buckwheat straw mixed materials with simple treatment had a high efficiency for the removal of Cr(VI) and would be a promising adsorbent.
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Keywords
Eupatorium adenophorum
buckwheat straw
adsorption
Cr(VI)
thermodynamics
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Corresponding Author(s):
Ping YANG
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Online First Date: 11 December 2013
Issue Date: 17 November 2014
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