Photocatalytic Degradation of 17β-estradiol, 17α-ethinylestradiol and Bisphenol A in Different Water Matrices
Photocatalytic degradation of three endocrine disrupting chemicals (EDCs), 17β-estradiol, 17α-ethinylestradiol and bisphenol A catalyzed by TiO2 was studied in different water matrices (Milli-Q water and tap water). The degradation profiles of each EDC followed the pseudo-first-order law. The rate constants for E2, EE2 and BPA were appreciably reduced in tap water compared to those in Milli-Q water, which can be explained by the presence of inorganic species. The major anion HCO3 -in tap water restrained the degradation and 1 mmol/L HCO3 -seemed to be sufficient to scavenge most hydroxyl radicals. Inhibitory effect of Ca2+could be attributed to the aggregation of TiO2 particles. Photocatalysis of the selected EDCs was affected by the initial pH in different ways in Milli-Q water and tap water. The optimum pH was about 7 for the degradation of three selected EDCs in Milli-Q water. However, an obvious retardation was observed with the increase of pH from 3 to 12 in tap water, which was related to the existence of carbonate species. Furthermore, the coexisting humic acid greatly suppressed the photocatalytic degradation of EDCs due to competing for photons, OH-radicals and the adsorption sites. The present study was helpful to raise concern about degrading EDCs in natural waters which contains a lot of inorganic and organic compounds.
LI Si SUN Weiling XU Nan MAI Jiaxing NI Jinren
Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Ene Department of Environmental Engineering, Peking University,The Key Laboratory of Water and Sediment
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
239-247
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）