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标题：Kinetic of Adsorption of Chromium and Lead Ions on Bentonite Clay Using Novel Internal Parallel Model
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作者：Saad A. Al-Jlil
期刊名称：Research Journal of Environmental Toxicology
印刷版ISSN：1819-3420
出版年度：2015
卷号：9
期号：1
页码：1-16
DOI：10.3923/rjet.2015.1.16
出版社：Academic Journals Inc., USA
摘要：The main objective of this study was to characterize the Bentonite clay collected from West of Saudi Arabia and investigate its potential for the adsorption of chromium (Cr) and lead (Pb) ions from wastewater. Application of Saad models described the experimental data very well. The maximum adsorption capacity of Bentonite clay was 13.79 mg g^-1 for chromium and 51.19 mg g^-1 for lead ion. The results for the effect of different agitation speed and the initial concentrations on adsorption of Cr and Pb ions on Bentonite clay showed that increasing the agitation speed increased the adsorption rate of metal ions on Bentonite clay. The kinetics of chromium and lead ions on Bentonite clay were also determined. A novel diffusion model called as the Saad Two Resistances Internal Diffusion Model (STRIDM) was used to calculate the time constant in a batch adsorber. It was found that the internal mass diffusion is a major rate-controlling step for maximum removal of chromium and lead ions from wastewater.