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1- Department of Environmental Health, Health Promotion Research Center, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran.
2- Department of Environmental Health, Student Research Committee, Zahedan University of Medical Sciences, Zahedan, Iran.
Abstract:   (113 Views)
Background:  Nowadays is emergent the development of new materials which can be used in the adsorption process to remove dyes from the aquatic environment. Therefore performance Raw Kaolin (RK) as a low cost adsorbent to remove Direct Blue 71 (DB71) dye from aqueous solutions has been evaluated.
Methods: For sorption study, various parameters were optimized and Freundlich, Dubinin–Radushkevich, Langmuir and Temkin isotherm models were applied to demonstrate the mechanism of sorption, while kinetics study for sorption was evaluated using diffusion models, pseudo-first-order kinetic and pseudo-second-order kinetic models.
Results: Results revealed that at DB71 concentration of 10 mg/L, adsorbent dose of 2.5 g/L, and contact time of 75 min, the DB71 removal reached to about 98.5%. Adsorption data fitted best into the Langmuir and D-R adsorption isotherm. The maximum monolayer adsorption capacity was 36.41 mg/g. The pseudo second order kinetics best described the kinetics of the adsorption system.
Conclusion:  Results revealed that Kaolin could be applied for DB71 dye removal from solution samples with the efficiency of 98.5% which could be used as a low-cost and effective adsorbent.
     
Type of Study: Research Article | Subject: Environmental Health, Sciences, and Engineering
Received: 2018/12/29 | Accepted: 2019/02/12 | Published: 2019/02/12

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