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|標題:||The heterogeneous photocatalytic degradation, intermediates and mineralization for the aqueous solution of cresols and nitrophenols|
|期刊/報告no：:||Journal of Hazardous Materials, Volume 59, Issue 2-3, Page(s) 251-260.|
|摘要:||This investigation was initiated to study the heterogeneous photocatalytic reactions of cresols and nitrophenols with ultraviolet light/titanium dioxide (UV/TiO2) system. The experimental parts consisted of pH effect, determination of intermediates and mineralization. At pH 7 and a concentration of 0.1 mM, cresols and nitrophenols nearly disappeared after 2.5 h of reaction time. Under various pH levels, the pseudo first order rate constants of Langmuir-Hinshelwood model was found satisfactory. From the results of GC/MS analysis, most intermediate products were hydroxyl derivatives of parent compounds as a result of photocatalyzed hydroxylation, In the mineralization of o-nitrophenol, about 89.6% of the compounds were mineralized in 9 h of reaction time with initial formation of nitrite and nitrate ions, indicating denitration followed by subsequent degradation. (C) 1998 Elsevier Science B.V.|
|Appears in Collections:||環境工程學系所|
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