کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4486989 | 1317008 | 2006 | 8 صفحه PDF | دانلود رایگان |
In this paper, the degradation of phenolic compounds using hydrogen peroxide as oxidizer and the enzyme extract from Serratia marcescens AB 90027 as catalyst was reported. With such an enzyme/H2O2 combination treatment, a high chemical oxygen demand (COD) removal efficiency was achieved, e.g., degradation of hydroquinone exceeded 96%. From UV–visible and IR spectra, the degradation mechanisms were judged as a process of phenyl ring cleavage. HPLC analysis shows that in the degradation p-benzoquinone, maleic acid and oxalic acid were formed as intermediates and that they were ultimately converted to CO2 and H2O. With the enzyme/H2O2 treatment, vanillin, hydroquinone, catechol, o-aminophenol, p-aminophenol, phloroglucinol and p-hydroxybenzaldehyde were readily degraded, whereas the degradation of phenol, salicylic acid, resorcinol, p-cholorophenol and p-nitrophenol were limited. Their degradability was closely related to the properties and positions of their side chain groups. Electron-donating groups, such as –OH, –NH2 and –OCH3 enhanced the degradation, whereas electron-withdrawing groups, such as –NO2, –Cl and –COOH, had a negative effect on the degradation of these compounds in the presence of enzyme/H2O2. Compounds with −OH at ortho and para positions were more readily degraded than those with –OH at meta positions.
Journal: Water Research - Volume 40, Issue 16, September 2006, Pages 3091–3098