Mineralization of Catechol by Fenton and Photo‐Fenton Processes     

Asma M'hemdi  Bechir Dbira  Ridha Abdelhedi  Enric Brillas  Salah Ammar 《洁净——土壤、空气、水》2012,40(8):878-885

Catechol is one of the most abundant phenolic components of olive mill wastewaters. In this article, the mineralization of this compound in synthetic aqueous solutions by the Fenton and photo‐Fenton processes is studied. It has been found that for 1.44 mM catechol, the total organic carbon of solutions is reduced about 94.4% at best after 60 min of Fenton treatment at optimized conditions of pH 3.0, 0.2 mM Fe²⁺, 7.09 mM H₂O₂, and 25°C. A faster and overall mineralization is attained by applying photo‐Fenton with UVA irradiation. o‐Benzoquinone, 1,2,3‐trihydroxybenzene and 1,2,4‐trihydroxybenzene were identified by GC–MS as primary quinonic and polyhydroxylated derivatives. Small amounts of generated carboxylic acids like muconic, maleic, malonic, acetic, oxalic, and formic acids were detected by ion‐exclusion chromatography. The Fe(III) complexes of these acids persist in the medium under Fenton conditions, while their photolysis by UVA light and that of other by‐products account for by the faster degradation and total mineralization achieved in the photo‐Fenton process. A reaction sequence for catechol mineralization by Fenton and photo‐Fenton involving all intermediates detected is proposed.  相似文献   

Assessment of Haloacetic Acids in Drinking Water in Bizerte,Tunisia          下载免费PDF全文

Bechir Hammami  Sihem Ben Hessin  Mohamed Bahri  Mohamed Ridha Driss 《洁净——土壤、空气、水》2014,42(8):1052-1059

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Statistical assessment of changes in extreme maximum temperatures over Saudi Arabia, 1985–2014     

Raggad  Bechir 《Theoretical and Applied Climatology》2018,132(3-4):1217-1235

Theoretical and Applied Climatology - In this study, two statistical approaches were adopted in the analysis of observed maximum temperature data collected from fifteen stations over Saudi Arabia...  相似文献