Sunflower stalk, an agricultural waste, as an adsorbent for the removal of lead and cadmium from aqueous solutions

被引：0
作者：
Mohsen Jalali
Fathemeh Aboulghazi
机构：
[1] Bu-Ali Sina University,Department of Soil Science, College of Agriculture
[2] Bu-Ali Sina University,Faculty of Chemistry
来源：
Journal of Material Cycles and Waste Management | 2013年 / 15卷
关键词：
Sunflower; Adsorbent; Lead; Cadmium; Isotherm;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Sunflower residue, an agricultural waste material for the removal of lead (Pb) and cadmium (Cd) from aqueous solutions were investigated using a batch method. Adsorbent was prepared by washing sunflower residue with deionized water until the effluent was colorless. Batch mode experiments were carried out as a function of solution pH, adsorbent dosage, initial concentration and contact time. The results indicated that the adsorbent showed good sorption potential and maximum metal removal was observed at pH 5. Within 150 min of operation about 97 and 87 % of Pb and Cd ions were removed from the solutions, respectively. Lead and Cd sorption curves were well fitted to the modified two-site Langmuir model. The adsorption capacities for Pb and Cd at optimum conditions were 182 and 70 mg g−1, respectively. The kinetics of Pb and Cd adsorption from aqueous solutions were analyzed by fitting the experimental data to a pseudo-second-order kinetic model and the rate constant was found to be 8.42 × 10−2 and 8.95 × 10−2 g mg−1 min−1 for Cd and Pb, respectively. The results revealed that sunflower can adsorb considerable amount of Pb and Cd ions and thus could be an economical method for the removal of Pb and Cd from aqueous systems.
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页码：548 / 555
页数：7
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