Application of microwave irradiation for the removal of polychlorinated biphenyls from siloxane transformer and hydrocarbon engine oils.
The removal of polychlorinated biphenyls (PCBs) both from siloxane transformer oil and hydrocarbon engine oil was investigated through the application of microwave (MW) irradiation and a reaction system based on polyethyleneglycol (PEG) and potassium hydroxide. The influence of the main reaction parameters (MW irradiation time, molecular weight of PEG, amount of added reactants and temperature) on the dechlorination behavior was studied. Promising performances were reached, allowing about 50% of dechlorination under the best experimental conditions, together time and energy saving compared to conventional heating systems. Moreover, an interesting dechlorination degree (up to 32%) was achieved for siloxane transformer oil when MW irradiation was employed as the unique driving force. To the best of our knowledge, this is the first time in which MW irradiation is tested as the single driving force for the dechlorination of these two types of PCB-contaminated oils.
Dipartimento di Scienze della Terra, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy. Electronic address: claudia.antonetti@unipi.it.
Claudia
C
Antonetti
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy.
Domenico
D
Licursi
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy.
Anna Maria
AM
Raspolli Galletti
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy.
Marco
M
Martinelli
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy.
Filippo
F
Tellini
Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy.
Giorgio
G
Valentini
ARCHA Laboratory S.r.l., Via di Tegulaia 10/A, 56121, Pisa, Italy.
Francesca
F
Gambineri
D054879:Halogenation; D006838:Hydrocarbons / Q000737:chemistry / Q000528:radiation effects; D006878:Hydroxides / Q000737:chemistry; D008872:Microwaves; D008970:Molecular Weight; D009821:Oils / Q000737:chemistry / Q000528:radiation effects*; D011078:Polychlorinated Biphenyls / Q000737:chemistry / Q000528:radiation effects*; D011092:Polyethylene Glycols / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry / Q000528:radiation effects*; D013696:Temperature
D006838:Hydrocarbons; D006878:Hydroxides; D009821:Oils; D017680:Potassium Compounds; D012833:Siloxanes; D011092:Polyethylene Glycols; D011078:Polychlorinated Biphenyls; C029943:potassium hydroxide
Dechlorination; Engine oil; Microwave; PCBs; Transformer oil