Bisphenol A mineralization by integrated ultrasound-UV-iron (II) treatment.
Bisphenol A (BPA), an organic compound largely used in the plastic industry as a monomer for production of epoxy resins and polycarbonate, is an emerging contaminant that is released in the environmentfrom bottles and packaging. BPA degradation (118 micromol L(-1)) under sonochemical conditions was investigated in this study, using a 300 kHz frequency, with a 80 W electrical power. Under these conditions, BPA was eliminated by the ultrasound process (-90 min). However, even after long ultrasound irradiation periods (10 h), more than 50% of chemical oxygen demand (COD) and 80% of total organic carbon (TOC) remained in the solution, indicating that most BPA intermediates are recalcitrant toward ultrasonic action. Accumulation of hydrogen peroxide from *OH and *OOH radical recombination was also observed. To increase the efficiency of BPA treatment, experiments combined ultrasound with Fe2+ (100 micromol L(-1)) and/or UV radiation (254 nm): Ultrasound/UV; Ultrasound/Fe2+; Ultrasound/UV/ Fe2+. Both UV and Fe2+ induced hydrogen peroxide dissociation, leading to additional *OH radicals and complete COD and TOC removal. Thus difficulties in obtaining mineralization of micropollutants like BPA through ultrasonic action alone, can be overcome by the Ultrasound/UV/ Fe2+ combination. Moreover, this technique was found to be the most cost-effective one. So, the integrated ultrasound-UV-iron(ll) process was shown to be of interest for the treatment of wastewaters contaminated with BPA.
Torres
Ricardo A
RA
Laboratoire de Chimie Moléculaire et Environnement, Polytech'Savoie-Université de Savoie, 73376 Le Bourget-du-Lac, France.
Pétrier
Christian
C
Combet
Evelyne
E
Moulet
Florence
F
Pulgarin
Cesar
C
D001559:Benzhydryl Compounds; D002244:Carbon / Q000032:analysis; D052244:Endocrine Disruptors / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis; D010636:Phenols / Q000737:chemistry*; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014876:Water Pollution / Q000517:prevention & control*; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D002244:Carbon; D052244:Endocrine Disruptors; D005296:Ferrous Compounds; D006861:Hydrogen Peroxide; D010636:Phenols; C006780:bisphenol A; D000098826:Bisphenol A Compounds