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Kinetic and regeneration studies of photocatalytic magnetic separable beads for chromium (VI) reduction under sunlight

Idris, Ani and Hassan, Nursia Diana and Rashid, Roslina and Ngomsik, Audrey Flore (2011) Kinetic and regeneration studies of photocatalytic magnetic separable beads for chromium (VI) reduction under sunlight. Journal of Hazardous Materials, 186 (1). pp. 629-635. ISSN 0304-3894

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2010.11.101


Physical adsorption and photocatalytic reduction of Cr(VI) in magnetic separable beads were investigated. In order to elucidate the kinetics of photocatalytic process, operating parameters such as catalyst dosage and the initial concentration were examined in detail. It was observed that the reduction rate of Cr(VI) increased with an increase in the catalyst loading, as this translated into an increase in the number of available active sites. Critical scrutiny of the percentage of the initial reduction rate versus time at various initial concentration of Cr(VI) revealed that the rate of substrate conversion decreased as the initial concentration increased. The kinetic analysis of the photoreduction showed that the removal of Cr(VI) satisfactory obeyed the pseudo first-order kinetic according to the Langmuir–Hinshelwood (L–H) model and the absorption of Cr(VI) on the magnetic beads surfaces was the controlling step in the entire reduction process. Furthermore, desorption experiments by elution of the loaded gels with sodium hydroxide indicated that the magnetic photocatalyst beads could be reused without significant losses of their initial properties even after 3 adsorption–desorption cycles.

Item Type:Article
Uncontrolled Keywords:langmuir-hinshelwood model, maghemite, magnetic beads, magnetic nanoparticles, photocatalyst, regeneration
Subjects:Q Science > QD Chemistry
Divisions:Chemical and Natural Resources Engineering
ID Code:29226
Deposited By: Yanti Mohd Shah
Deposited On:26 Feb 2013 08:30
Last Modified:17 Mar 2019 03:03

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