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Published on: May 1, 2012
Subcritical Water-Driven Complete Mineralization of Silane Coupling Agents with Short Perfluoroalkyl Chains
Hisao Hori1, Hiroto Hanashima1, Hisashi Saito1
1Faculty of Science, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan.
Abstract:
The decomposition of CF3CH2CH2Si-(OMe)3 and C4F9CH2CH2Si-(OMe)3typical fluorinated silane coupling agents used for surface modificationwas investigated in subcritical water for potential waste treatment applications. When CF3CH2CH2Si-(OMe)3 was heated in subcritical water with no additive at 350 °C, only a small amount of fluoride (F-) was produced. In contrast, virtually complete mineralization of CF3CH2CH2Si-(OMe)3 was achieved in the presence of KMnO4. Specifically, after treatment with 0.50 mmol of KMnO4 for 6 h, the F- yield reached 100%, and the residual total organic carbon in the reaction solution was reduced to 4% of the initial carbon content of CF3CH2CH2Si-(OMe)3. Furthermore, under the same reaction conditions, quasi-complete mineralization of C4F9CH2CH2Si-(OMe)3 was also attained, with an F- yield of 96% and a remaining TOC ratio of 2%.
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