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Journal of Dispersion Science and Technology Volume 35, 2014 - Issue 2
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Original Articles

Study on the Physical Chemistry, Equilibrium, and Kinetic Mechanism of Azure A Biosorption by Zea Mays Biomass

Zvezdelina Yaneva Chemistry Unit, Department of Pharmacology, Animal Physiology and Physiological Chemistry, Faculty of Veterinary Medicine, Trakia University, Students Campus, Stara Zagora, BulgariaCorrespondence[email protected]
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Nedyalka Georgieva Chemistry Unit, Department of Pharmacology, Animal Physiology and Physiological Chemistry, Faculty of Veterinary Medicine, Trakia University, Students Campus, Stara Zagora, Bulgaria
Pages 193-204 | Received 05 Feb 2013, Accepted 24 Feb 2013, Published online: 30 Jan 2014
 
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Abstract

The mechanism of Azure A (AA) biosorption by Zea mays biomass (ZMB) was studied. Surface chemistry and morphology were characterized by potentiometric titration, pH of zero charge, FTIR, and microscope analysis. The equilibrium data was modeled by Langmuir, Freundlich, Redlich-Peterson, Temkin, and multilayer models. AA biosorption was mainly limited by chemisorption, but the role of intraparticle diffusion could not be neglected. The integrative analysis of surface chemistry/biosorption studies showed that chemisorption, ion exchange, complexation, and/or electrostatic attraction were involved during AA biosorption. The maximum biosorption capacity of ZMB (q 5.84 mg/g) was registered at pH 7.6.

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