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Dissolution studies on $TiO_{2}$ with organics

Mukherjee, Amitava and Raichur, Ashok M and Modak, Jayant M (2005) Dissolution studies on $TiO_{2}$ with organics. In: Chemosphere, 61 (4). pp. 585-588.

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In this work the effect of organic reducing reagents, namely, ascorbic acid, oxalic acid and L-cysteine on dissolution of commercial $TiO_{2}$ has been investigated. Kinetic studies showed that a maximum of about 45% of $TiO_{2}$ was dissolved by ascorbic acid in 4 h when oxide:acid molar ratio was kept at 1:2. The dissolution of $TiO_{2}$ increased with increase in ascorbic acid and oxalic acid concentration up to 0.15 M in 4h(corresponding to molar ratio of oxide to acid of 1: 3) and further addition did not affect the dissolution. Nearly 45% $TiO_{2}$ dissolution was obtained with ascorbic acid alone while oxalic acid yielded 40% dissolution. When oxalic acid was added along with ascorbic acid in equi-molar concentrations, dissolution of $TiO_{2}$ was enhanced to 60% in2.5 h but when cysteine was added to ascorbic acid the dissolution was about 50% in just 1 h.

Item Type: Journal Article
Publication: Chemosphere
Publisher: Elsevier Science Ltd
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Reductant;Ascorbic acid;Oxalic acid;Cysteine
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Nov 2005
Last Modified: 19 Sep 2010 04:21
URI: http://eprints.iisc.ac.in/id/eprint/4124

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