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标题：Characterization and Application of Bentonite Clay for Lead Ion Adsorption from Wastewater: Equilibrium and Kinetic Study
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作者：Saad A. Al-Jlil
期刊名称：Research Journal of Environmental Sciences
印刷版ISSN：1819-3412
电子版ISSN：2152-8238
出版年度：2015
卷号：9
期号：1
页码：1-15
DOI：10.3923/rjes.2015.1.15
出版社：Academic Journals Inc., USA
摘要：The main objective of this study was to characterize Bentonite natural clay from West of Saudi Arabia and evaluate its performance for lead ions adsorption from wastewater at different temperatures. It was found that the adsorption capacity of Bentonite clay increased by increasing the temperature of the system. The Langmuir model described the experimental data at different temperatures very well. The maximum adsorption capacity of Bentonite clay was 51.19 mg g^-1 at 20°C and 54.62 mg g^-1 at 80°C. The thermodynamic parameters such as enthalpy, entropy and Gibes energy were also obtained. The results showed that the adsorption is endothermic and favorable at high temperature s. The kinetics of lead ions on Bentonite clay was determined. The mathematical model s, to characterize experimental results for the batch systems, included the resistance models based on external mass transfer and internal mass diffusion. The kinetic model based on external mass transfer predicted the experimental adsorption behavior for only a short time. A novel diffusion model called as Saad Internal Diffusion Model (SIDM) was obtained to calculate the internal diffusion coefficient in a batch adsorber. It was observed that the internal mass diffusion is a major rate-controlling step during the lead ions removal process from wastewater. The economic study based on adsorption capacity showed potential feasibility of using Bentonite clay as an alternative to activated carbon for lead ions removal from wastewaters.