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Showing papers by "Sampa Chakrabarti published in 2011"

Journal Article•DOI•
Reduction of hexa-valent chromium with zero-valent iron: Batch kinetic studies and rate model

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Pallavi Mitra1, Debasish Sarkar1, Sampa Chakrabarti1, Binay K. Dutta2•
University of Calcutta1, Petroleum Institute2
15 Jun 2011-Chemical Engineering Journal
TL;DR: In this paper, a kinetic model that takes into account the direct reduction, the passivation process and the resultant decline of the active surface area of reaction is proposed, and the model parameters have been estimated by global optimization at each of the pH values.

81 citations

Journal Article•
Comparison of the photocatalytic degradation of polyvinyl chloride and polystyrenewith zinc oxide semiconductor catalyst under tropical sunlight

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Sampa Chakrabarti, Sekhar Bhattacharjee, Devika Sil, Basab Chaudhuri
01 Jan 2011-Chemical Technology: An Indian Journal
TL;DR: In this article, composite films have been prepared by dispersing zinc oxide semiconductor particles in thematrix of polyvinyl chloride (PVC) and polystyrene (PS).
Abstract: Composite films have been prepared by dispersing zinc oxide semiconductor particles in thematrix of Polyvinyl chloride (PVC) and Polystyrene (PS). Photocatalytic degradation of the films has been studied under tropical sunlight in presence of air and water. The degradation of the two polymers has been compared. Time-weight loss data have been collected and in both cases, the degradation was observed to follow pseudo first order kinetics. The filmswere characterized before and after irradiation by SEMand FTIRATR to study the surface morphology and the possible degradation products respectively. Increase in zinc oxide loading increased the rate and extent of degradation. A model has been suggested for the degradation reaction and the experimental data fit very well to the kinetic model.

1 citations