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Title Treatment of Phenol in Water Using Microwave-assisted Advanced Oxidation Processes
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Publication Date
Date Available
University/Publisher University of Saskatchewan
Abstract Phenol and its compounds are highly toxic even in low concentration, and have become the subject of intense research during the last two decades. Effluents from industries such as oil refining, paper milling, olive oil extraction, wood processing, coal gasification and textiles and resin manufacturing and agro-industrial wastes discharge phenols at levels much higher than the toxic levels set for this compound. Advanced Oxidation Processes (AOPs) such as UV, UV-TiO2, UV-H2O2, O3 and UV-O3 have become popular in recent years as efficient treatment methods for recalcitrant compounds like phenol. The effect of microwave (MW) and combined MW-UV treatment on degradation of phenol was studied in aqueous solution in the presence and absence of TiO2 under controlled temperature conditions. It was found that the efficiency of MW and MW-UV processes for the degradation of phenol was less than 10% after 120 minutes of treatment. However, the efficiencies of MW-TiO2 (hydrothermal) and MW-TiO2 (sol-gel) were slightly more than those of the above processes at 12 to 15% after 120 minutes, which might be due to adsorption of the phenol on the surface of TiO2 particles. It also was observed that MW-UV-TiO2 was superior to any other process studied for the degradation of phenol. At natural pH, the degradation efficiency of MW-UV-TiO2 (HT) on 1500 ppm of phenol in water was 23%, and for MW-UV-TiO2 (SG) it was 20%. Hence, it can be concluded that the catalyst (TiO2) prepared by the hydrothermal (HT) method had better catalytic activity than TiO2 prepared by the sol-gel (SG) method, which might be due to its structural and optical characteristics. Of the two developed reactors which are MW and a combined MW-UV reactor, MW-UV combined with TiO2 could be used for most successful degradation of phenol.
Subjects/Keywords Phenol, Microwave, Dielectric Properties
Contributors Meda, Venkatesh; Dalai, ajay; Lope, Tabil; Tyler, Robert; Baik, Oon-Doo; Soltan, Jafar; chang, won
Language en
Country of Publication ca
Record ID handle:10388/ETD-2014-04-1511
Other Identifiers TC-SSU-2014041511
Repository sask
Date Retrieved
Date Indexed 2018-12-06

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…of phenol degradation. The specific objectives were:  to determine the dielectric properties of phenol-water mixtures over the microwave frequency range of 1 to 5 GHz;  to synthesize (hydrothermal and sol-gel methods) and characterize…

…introduces the subject matter and the overall and specific objectives of the research. The review of literature on phenol properties, sources, toxicity and 5 different treatment methods is presented in Chapter 2. Chapter 3 presents the study on dielectric

properties of phenol- water mixtures, i.e. the effect of phenol concentration, temperatures and microwave frequency, and results and discussion. Chapter 4 presents the synthesis of TiO2 catalyst by two methods, development of combined microwave-UV reactor and…

…on phenol structure, physical and chemical properties, dielectric properties, sources of contamination, environmental problems, toxicity and different methods available for its treatment, is reviewed and presented in this chapter as an understanding…

…Another thermal effect of microwave radiation is the formation of “hot spots”. Hot spots are areas which have higher temperatures than their surroundings because of greater interaction with the microwave field and their poor heat transfer properties. The…

…increased number of OH• radicals and changes in hydrophilic/hydrophobic characteristics were attributed to the non-thermal effects of the microwave radiation (Mishra et al. 2009). 2.8.7 Microwave (MW) theory and the role of dielectric

…that the effect of MW irradiation on reaction kinetics was due to dielectric heating and non-thermal action. Microwave irradiation does not result in changes in the structure of a molecule. It is a non-ionizing radiation causing molecular motion by…

…CHAPTER 4. DEGRADATION OF PHENOL WITH MICROWAVE AND MICROWAVE UV IRRADIATION TREATMENT SYSTEM USING NANO-TiO2 4.1 Abstract…………………………………………………………………………….. 50 4.2 Introduction………………………………………………………………………… 50 4.3 Materials and Methods…

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