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Degradation of Transformer Oil (PCB Compounds) by Microwave Radiation, Ethanol Solvent, Hydrogen Peroxide and Dioxide Titanium for Reducing Environmental Hazards

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Author(s): Reza Tajik | Hasan Asilian | Ali Khavanin | Ahmad Jonidi Jafari | Babak Eshrati | Ardalan Soleimanian | Jaber Ghrehdaghi

Journal: Iranian Journal of Toxicology
ISSN 2008-2967

Volume: 6;
Issue: 19;
Start page: 757;
Date: 2013;
Original page

Keywords: Degradation | Microwave | Pcbs | Tio2.

ABSTRACT
Background: Poly chlorinated biphenyls (PCBs) are a class of chlorinated organicchemicals that do not easily degrade in the environment. This study was conductedto determine the effect of microwave rays, hydrogen peroxide, dioxide titanium andethanol solvent on the degradation of PCBs.Methods: A 900w domestic MW oven with a fixed frequency of 2450 MHZ wasused to provide MW irradiation. Ray powers were used in 540, 720, and 900w. Ahole was made on the top portion of the oven and a Pyrex vessel reactor (250mlvolume) was connected to condensing system with a Pyrex tube connector. ThePCBs were analyzed by GC-ECD.Results: The degradation of total PCBs was 54.62%, 79.71%, and 95.76% interms of their ratio to solvent with transformer oil at 1:1, 2:1, and 3:1, respectively.The degradation of total PCBs was 84.27%, 89.18%, and 96.1% when using 540,720, and 900W microwave radiation, respectively. The degradation of total PCBswas 70.72%, 93.02%, 94.16, 95.23% and 96.1% when not using H2O2/ Tio2 andusing 20% H2O2 and 0.05, 0.1, 0.15, and 0.2g Tio2, respectively.Conclusion: In the present study, the optimum conditions to decompose PCBsefficiently included 50 ml volume of ratio to solvent with transformer oil (3:1),sodium hydroxide solution (0.2N) 1 cc, use of 20% hydrogen peroxide of totalvolume of samples, dioxide titanium (0.2g), and irradiation for 9 minutes. Underthese optimum conditions, efficiency of PCBs decomposition increased.

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