Sorption of hydrogen peroxide by titanium (IV) oxide grafted on silica gel surface
- Unicamp, Campinas, SP (Brazil)
Hydrogen peroxide was adsorbed from an aqueous solution by titanium (IV) oxide grafted on a silica gel surface. The maximum sorption capacity, 1.2 molecule nm{sup {minus}2}, was achieved in solution at pH 3. The photoacoustic spectrum of the sorbed species indicated a similar structure for the complex formed between Ti{sup 4+} and H{sub 2}O{sub 2} in aqueous solution (Ti(H{sub 2}O{sub 2}){sub m}{sup 4+}). The adsorbed hydrogen peroxide retained the oxidation capacity for several weeks. Electron spin resonance showed the presence of a free radical on the surface. The observed g values, g{sub 1} = 2,000, g{sub 2} = 2.007, and g{sub 3} = 2.020, were attributed to the {triple_bond} Ti{sup +}O{sub 2}{sup {minus}} radical, formed during the decomposition of adsorbed hydrogen peroxide.
- OSTI ID:
- 94369
- Journal Information:
- Journal of Colloid and Interface Science, Vol. 173, Issue 2; Other Information: PBD: Aug 1995
- Country of Publication:
- United States
- Language:
- English
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