摘要
Polybrominated diphenyl ethers (PBDEs) spread widely in the environment are mainly removed by photochemical and anaerobic microbial degradation. In this paper, the decomposition of 4-bromodiphenyl ether (BDE -3), the PBDEs homologues, is investigated by electron beam irradiation of its ethanol/water solution (reduction system) and acetonitrile/water solution (oxidation system). The radiolytic products were determined by GC coupled with electron capture detector, and the reaction rate constant of esol– in the reduction system was measured at 2.7×1010 L·mol–1·s–1 by pulsed radiolysis. The results show that the BDE-3 concentration affects strongly the decomposition ratio in the alkali solution, and the reduction system has a higher BDE-3 decomposition rate than the oxidation system. This indicates that the BDE-3 was reduced by effectively capturing esol– in radiolytic process.
Polybrominated diphenyl ethers （PBDEs） spread widely in the environment are mainly removed by photochemical and anaerobic microbial degradation. In this paper, the decomposition of 4-bromodiphenyl ether （BDE -3）, the PBDEs homologues, is investigated by electron beam irradiation of its ethanol/water solution （reduction system） and acetonitrile/water solution （oxidation system）. The radiolytic products were determined by GC coupled with electron capture detector, and the reaction rate constant of esol in the reduction system was measured at 2.7× 10^10 L.mol^-1·s^-1 by pulsed radiolysis. The results show that the BDE-3 concentration affects strongly the decomposition ratio in the alkali solution, and the reduction system has a higher BDE-3 decomposition rate than the oxidation system. This indicates that the BDE-3 was reduced by effectively capturing esol^- in radiolytic process.
基金
Supported by National Natural Science Foundation of China (No. 40830744 and 40973073)
National Key Technology R&D Program in the 11th Five-year Plan of China (No. 2008BAC32B03)
Shanghai Leading Academic Discipline Project (No. S30109)
Science and Technology Commission of Shanghai Municipality (No. 09ZR1411300
A.10-0111-07-003)
