Kinetics and thermodynamics of Cd(II) biosorption onto loquat (Eriobotrya japonica) leaves

被引:40
作者
Awwad, Akl M. [1 ]
Salem, Nida M. [2 ]
机构
[1] Royal Sci Soc, Amman 11941, Jordan
[2] Univ Jordan, Fac Agr, Amman, Jordan
关键词
Biosorption; Cadmium ions; Loquat leaves; Adsorption isotherms; Kinetic; Thermodynamic; AQUEOUS-SOLUTION; COPPER(II) IONS; CADMIUM IONS; LEAD IONS; ADSORPTION; EQUILIBRIUM; REMOVAL; ISOTHERM; SORPTION;
D O I
10.1016/j.jscs.2011.10.007
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A new biosorbent loquat (Eriobotrya japonica) leaves waste for removing cadmium (II) ions from aqueous solutions has been investigated. The extent of biosorption of Cd(II) ions was found to be dependent on solution pH, initial cadmium ion concentrations, biosorbent dose, contact time, and temperature. The experimental equilibrium biosorption data were analyzed by four widely used two-parameters Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm equations. Langmuir and Temkin isotherm models provided a better fit with the experimental data than Freundlich and Dubinin-Radushkevich isotherm models by high correlation coefficients R-2. The thermodynamic analysis indicated that the biosorption behavior of cadmium ions onto loquat leaves (LL) biosorbent was an endothermic process, resulting in higher biosorption capacities at higher temperatures. The negative sign values of Delta G(0) and positive values of Delta H-0 revealed that the biosorption process was spontaneous and endothermic. Kinetic studies showed that pseudo-second order described the biosorption experimental data better than the pseudo-first order kinetic model. The (LL) were successfully used for the biosorption of cadmium ions from contaminated water sources. (C) 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.
引用
收藏
页码:486 / 493
页数:8
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