Dissolution studies on TiO"2 with organics [An article from: Chemosphere]

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Description:
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 4h 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 0.15M 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% in 2.5h but when cysteine was added to ascorbic acid the dissolution was about 50% in just 1h.