期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 20, 期 9, 页码 6242-6255出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-013-1672-3
关键词
Nanocomposite; Hydrogel; Montmorillonite; Adsorption; Copper; Nickel
资金
- Arak University Research Fund
Nanocomposite hydrogels based on poly(methacrylamide-co-acrylic acid) and nano-sized montmorillonite were prepared by aqueous dispersion and in situ radical polymerization. Optimum sorption conditions were determined as a function of montmorillonite content, contact time, pH, and temperature. The equilibrium data of Cu2+ and Ni2+ conformed to the Freundlich and Langmuir isotherms in terms of relatively high regression values. The maximum monolayer adsorption capacity of the nanocomposite hydrogel (with 3 wt% montmorillonite content), as obtained from the Langmuir adsorption isotherm, was found to be 49.26 and 46.94 mg g(-1) for Cu2+ and Ni2+, respectively, at contact time = 60 min, pH = 6.8, adsorbent dose = 100 mg/ml, and temperature = 318 K. Kinetic studies of single system indicated that the pseudo-second order is the best fit with a high correlation coefficient (R (2) = 0.97-0.99). The result of five times sequential adsorption-desorption cycle shows a good degree of desorption and a high adsorption efficiency.
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