Preparation and characterization of corn cob activated carbon coated with nano-sized magnetite particles for the removal of Cr(VI)

Nethaji, S and Sivasamy, A and Mandal, A B (2013) Preparation and characterization of corn cob activated carbon coated with nano-sized magnetite particles for the removal of Cr(VI). Bioresource Technology, 134. pp. 94-100.

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Abstract

Activated carbon prepared from corn cob biomass, magnetized by magnetite nanoparticles (MCCAC) was used for the adsorption of hexavalent chromium from aqueous solution. The adsorbent was characterized by SEM, TEM, XRD, VSM, surface functionality and zero-point charge. The iron oxide nanoparticles were of 50 nm sizes and the saturation magnetization value for the adsorbent is 48.43 emu/g. Adsorption was maximum at pH 2. Isotherm data were modeled using Langmuir, Freundlich and Temkin isotherm. The prepared MCCAC had a heterogeneous surface. The maximum monolayer adsorption capacity was 57.37 mg/g. Kinetic studies were carried out and the data fitted the pseudo second-order equation. The mechanism of the adsorption process was studied by incorporating the kinetic data with intraparticle diffusion model, Bangham equation and Boyd plot. The adsorption was by chemisorption and the external mass transfer was the rate-determining step. A micro column was designed and the basic column parameters were estimated.

Item Type: Article
Uncontrolled Keywords: Magnetite nanoparticles Magnetized activated carbon Continuous column studies Adsorption isotherm Adsorption mechanism
Subjects: Engineering > MIT Manipal > Chemical
Depositing User: MIT Library
Date Deposited: 07 Oct 2015 11:33
Last Modified: 07 Oct 2015 11:33
URI: http://eprints.manipal.edu/id/eprint/144330

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