期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 176, 期 1-3, 页码 650-656出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.11.081
关键词
Equilibrium; Kinetic; Cadmium; Corn stalk
资金
- National Natural Science Foundation of China [40730741]
- Hi-Tech Research and Development Program of China [2007AA061001]
- Open Foundation of the State Key Laboratory of Pulp and Paper Engineering in South China University of Technology
This paper describes the adsorption of cadmium ions from aqueous solution using acrylonitrile (AN)-modified corn stalk (AMCS). AMCS was characterized by elemental analysis, scanning electron microscopy, surface area and porosity analyzer, Fourier transform infrared and solid-state CP/MAS C-13 NMR spectra, and then used to evaluate the adsorption capacity in different pH values, adsorption isotherm, kinetics and thermodynamics in batch experiments. The results showed that AMCS is found to be an effective adsorbent because of its pore size and functional groups (-CN). The pH of 7.0 was an optimal pH for removal of Cd(II) ion and the Langmuir model provides a better fit to the equilibrium data than the Freundlich model, showing a maximum uptake of 12.73 mg g(-1), compared to raw corn stalk (RCS) (3.39 mg g(-1)). Analysis indicated that pseudo-second-order kinetics controlled the adsorption rate. The activation energy (E,) was 9.43 kJ mol(-1). Thermodynamic parameters such as Delta G, Delta H and Delta S were also evaluated to predict the nature of adsorption process. (C) 2009 Elsevier B.V. All rights reserved.
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