Journal
FOOD CHEMISTRY
Volume 136, Issue 3-4, Pages 1508-1514Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2012.09.090
Keywords
Buckwheat hulls; Mercury adsorption; Kinetics; Thermodynamics; Isotherm
Funding
- National Natural Science Foundation of China [51102127, 51073075]
- Nature Science Foundation of Shandong Province [2009ZRB01463]
- Foundation of Innovation Team Building of Ludong University [08-CXB001]
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The adsorption kinetics and adsorption isotherms of buckwheat hulls in the region of Jiaodong, China (BHJC) for Hg(II) were investigated. Results revealed that the adsorption kinetics of BHJC for Hg(II) were well described by a pseudo second-order reaction model, and the adsorption thermodynamic parameters Delta G, Delta H and Delta S were -5.83 kJ mol(-1)(35 degrees C), 73.1, and 256J K-1 mol(-1), respectively. Moreover, Langmuir, Freundlich and Redlich-Peterson isotherm models were applied to analyse the experimental data and to predict the relevant isotherm parameters. The best interpretation for the experimental data was given by the Langmuir isotherm equation, and the maximum adsorption capacity for Hg(II) is 243.90 mg/g at 35 degrees C. Furthermore, investigation of the adsorption selectivity showed that BHJC displayed strong affinity for mercury in the aqueous solutions and exhibited 100% selectivity for mercury in the presence of Zn(II) and Cd(II). (C) 2012 Elsevier Ltd. All rights reserved.
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