Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (5): 295-304 doi: 10.13538/j.1001-8042/nst.23.295-304

• RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICIN • Previous Articles     Next Articles

Radiolytic degradation and mechanism study of electron beam-irradiated solutions of 4-tert-octylphenol

WANG Liang WU Minghong XU Gang * LIN Ning BU Tingting ZHENG Jisan TANG Liang   

  1. Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China
WANG Liang, WU Minghong, XU Gang, LIN Ning, BU Tingting, ZHENG Jisan, TANG Liang. Radiolytic degradation and mechanism study of electron beam-irradiated solutions of 4-tert-octylphenol.Nuclear Science and Techniques, 2012, 23(5): 295-304     doi: 10.13538/j.1001-8042/nst.23.295-304

Abstract:

In this study, we have investigated the degradation and primary radiolytic degradation mechanism of 4-tert-octylphenol (4-t-OP) by using of electron beam (EB) -irradiation. The results show that at an absorbed dose of 10 kGy and an initial concentration of 25 mg·L -1 , the degradation of 4-t-OP in a methanol/water reduction system is higher than in a acetonitrile/water oxidation system by 19.4% and higher than in an acetone/water system by 26.8%, which is due to both of ·OH and e aq - playing an important role in the decomposition of 4-t-OP, although the latter is more effective. The degradation rate of 4-t-OP will decrease with increment of absorbed dose in a methanol/water solution, and increase with decrement of initial concentration at a constant absorbed dose. The degradation efficiency will also decrease with the addition of anions and H 2 O 2 into the solution. A system saturated with N 2 will make an increment in the degradation of 4-t-OP. The pH value of solution has been also found to affect the degradation efficiency, while the degradation is more efficient in alkaline conditions. Finally, the initial products involved in degradation reaction have been determined to be ethylbenzene, styrene, bicyclo[4.2.0]octa-1,3,5-triene, 2,2,4-trimethylpentane and p-tert-butyl-phenol, which may arise from e aq - attack at the position of the alkyl side chain of 4-t-OP molecule. The results have been revealed that EB irradiation is a promising method for degradation of 4-t-OP, and e aq - may be main reactive species to attack at the position of the alkyl side chain of 4-t-OP.

Key words: 4-tert-octylphenol (4-t-OP), Endocrine disruptor, Degradation, Electron beam (EB) irradiation, Mechanism