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Removal of Cadmium and Humic Acid From Aqueous Solutions Using Surface Modified Nanozeolite A Publisher



Tashauoei HR1 ; Attar HM1 ; Amin MM1 ; Kamali M2 ; Nikaeen M1 ; Dastjerdi MV1
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran

Source: International Journal of Environmental Science and Technology Published:2010


Abstract

The sorption of cadmium and humic acids from aqueous solutions using surface-modified nanozeolite A has been investigated under various examination conditions. The morphology of untreated and treated nanozeolite was studied under scanning electron microscope and transmission electron microscope. Isotherms of cadmium adsorption onto surface-modified nanozeolite A were studied at different pH, solid to liquid ratio, adsorbate concentration and interaction time. Kinetic and equilibrium studies were conducted and the equilibrium data have been analyzed using Langmuir and Freundlich isotherm models. The study revealed that experimental results were in agreement with the Freundlich model. The Langmuir monolayer adsorption capacity was found to be 1666.67 g cadmium and 6.75 g humic acid per gram of modified nanozeolite A, which is higher than that of reported value for other zeolites. The sorption ability was enhanced by surface modification and reduction in size and enabled the zeolite to adsorb cadmium. The adsorption of cadmium and humic acid on nanozeolite was found to be the highest at pH 6 and 3, respectively. Results showed that solid to liquid ratio and pH are the most important factors for cadmium and humic acid removal, respectively. Effect of competitive ions was studied and results showed that there is no competition between cadmium and humic acid sorption and presence of these ions. © IRSEN CEERS IAU.
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