Degradation of chlordecone and beta-hexachlorocyclohexane by photolysis, (photo-)fenton oxidation and ozonation

作者：Cruz-Gonzalez German; Julcour Carine; Chaumat Helene; Bourdon Valerie; Ramon-Portugal Felipe; Gaspard Sarra; Jauregui-Haza Ulises J.^*; Delmas Henri

来源：Journal of Environmental Science and Health - Part B: Pesticides, Food Contaminants, and Agricultural Wastes , 2018, 53(2): 121-125.

DOI：10.1080/03601234.2017.1388682

• Water treatment
• advanced oxidation process
• UV treatment
• Fenton reaction
• ozonation
• pesticide
• micropollutant
• chlordecone
• HCH

Intensive use of chlorinated pesticides from the 1960s to the 1990s has resulted in a diffuse contamination of soils and surface waters in the banana-producing areas of the French West Indies. The purpose of this research was, for the first time, to examine the degradation of two of these persistent pollutants - chlordecone (CLD) and beta-hexachlorocyclohexane (beta-HCH) in 1mg L-1 synthetic aqueous solutions by means of photolysis, (photo-) Fenton oxidation and ozonation processes. Fenton oxidation is not efficient for CLD and yields less than 15% reduction of beta-HCH concentration in 5h. Conversely, both molecules can be quantitatively converted under UV-Vis irradiation reaching 100% of degradation in 5h, while combination with hydrogen peroxide and ferrous iron does not show any significant improvement except in high wavelength range (>280 nm). Ozonation exhibits comparable but lower degradation rates than UV processes. Preliminary identification of degradation products indicated that hydrochlordecone was formed during photo-Fenton oxidation of CLD, while for beta-HCH the major product peak exhibited C3H3Cl2 as most abundant fragment.

• 出版日期2018