Adsorption intrinsic kinetics and isotherms of lead ions on steel slag |
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| Authors: | Sheng-Yu Liu Jin Gao Yi-Jin Yang Ying-Chun Yang Zhi-Xiang Ye |
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| Affiliation: | 1. Department of Life Sciences and Technologies, Hubei Engineering University, Xiaogan 432000, China;2. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. College of Water Science, Beijing Normal University, Beijing 100875, China;3. College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;1. University of Novi Sad, Faculty of Technical Sciences, Department of Environmental Engineering and Occupational Safety and Health, Trg Dositeja Obradovi?a 6, 21 000 Novi Sad, Serbia;2. University of Novi Sad, Faculty of Medicine, Department of Pharmacy, Hajduk Veljkova 3, 21 000 Novi Sad, Serbia;3. Environmental Research Institute, North Highland College, University of the Highlands and Islands, Castle Street, Thurso, Caithness, Scotland KW14 7JD, UK |
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| Abstract: | Batch experiments were carried out to investigate the kinetics of adsorption of lead ions by steel slag on the basis of the external diffusion, intra-particle diffusion and adsorption reaction model (pseudo-first-order, pseudo-second-order). The results showed that the controlling step for the adsorption kinetics changed with the varying experimental parameters. When the particle size of steel slag was larger than 120 mesh, intra-particle diffusion of Pb2+ was the controlling step, and when the initial concentration of Pb2+ was less than 150 mg L?1 or the shaking rate was lower than 150 rpm, external diffusion of Pb2+ was promoted. Contrary to the former experimental conditions the adsorption reaction was the controlling step, and the adsorption followed second-order kinetics, with an adsorption rate constant of 13.26 g mg?1 min?1. The adsorption isotherm of Pb2+ with steel slag followed the Langmuir model, with a correlation coefficient of 0.99. |
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