17β-Estradiol Degradation by TiO2 Photocatalysis as a Means of Reducing Estrogenic Activity Export

@article{citeulike:3992184, abstract = {doi: 10.1021/es011500a The degradation of 17beta-estradiol (E2) in water by TiO2 photocatalysis was investigated; concurrently the estrogenic activity of the treated water was evaluated during the photocatalytic reactions by an estrogen screening assay. As a result, 10-6 M of E2 was totally mineralized to CO2 in 1.0 g L-1 TiO2 suspension under UV irradiation for 3 h. 10epsilon-17beta-Dihydroxy-1,4-estradien-3-one and testosterone-like species were elucidated as intermediate products by GC/MS analysis. The mechanisms of E2 degradation by TiO2 photocatalysis were discussed not only experimentally but also theoretically by calculating the frontier electron densities of the E2 molecule. On the basis of the results obtained, it was concluded that the phenol moiety of the E2 molecule, one of the essential functional groups to interact with the estrogen receptor, should be the starting point of the photocatalytic oxidation of E2. This means that the estrogenic activity should be almost lost concurrently with the initiation of the photocatalytic degradation. Actually, the estrogenic activities of the intermediate products were negligible. TiO2 photocatalysis could be applied to water treatment to effectively remove natural and synthetic estrogens without producing biologically active intermediary products.}, author = {Ohko, Yoshihisa and Iuchi, Ken-Ichiro and Niwa, Chisa and Tatsuma, Tetsu and Nakashima, Tetsuto and Iguchi, Taisen and Kubota, Yoshinobu and Fujishima, Akira}, citeulike-article-id = {3992184}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/es011500a}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/es011500a}, comment = {Interesting way to remove estrogen from water. Possible intervention.}, day = {1}, doi = {10.1021/es011500a}, journal = {Environmental Science \& Technology}, keywords = {environment, estradiol, estrogen-removal, intervention}, month = {October}, number = {19}, pages = {4175--4181}, posted-at = {2009-02-01 21:02:57}, priority = {2}, title = {17β-Estradiol Degradation by TiO2 Photocatalysis as a Means of Reducing Estrogenic Activity}, url = {http://dx.doi.org/10.1021/es011500a}, volume = {36}, year = {2002} }

TY - JOUR ID - citeulike:3992184 L3 - citeulike-article-id:3992184 N2 - doi: 10.1021/es011500a The degradation of 17beta-estradiol (E2) in water by TiO2 photocatalysis was investigated; concurrently the estrogenic activity of the treated water was evaluated during the photocatalytic reactions by an estrogen screening assay. As a result, 10-6 M of E2 was totally mineralized to CO2 in 1.0 g L-1 TiO2 suspension under UV irradiation for 3 h. 10epsilon-17beta-Dihydroxy-1,4-estradien-3-one and testosterone-like species were elucidated as intermediate products by GC/MS analysis. The mechanisms of E2 degradation by TiO2 photocatalysis were discussed not only experimentally but also theoretically by calculating the frontier electron densities of the E2 molecule. On the basis of the results obtained, it was concluded that the phenol moiety of the E2 molecule, one of the essential functional groups to interact with the estrogen receptor, should be the starting point of the photocatalytic oxidation of E2. This means that the estrogenic activity should be almost lost concurrently with the initiation of the photocatalytic degradation. Actually, the estrogenic activities of the intermediate products were negligible. TiO2 photocatalysis could be applied to water treatment to effectively remove natural and synthetic estrogens without producing biologically active intermediary products. IS - 19 JF - Environmental Science & Technology EP - 4181 TI - 17β-Estradiol Degradation by TiO2 Photocatalysis as a Means of Reducing Estrogenic Activity VL - 36 SP - 4175 KW - environment KW - estradiol KW - estrogen-removal KW - intervention N1 - Interesting way to remove estrogen from water. Possible intervention. AU - Ohko, Yoshihisa AU - Iuchi, Ken-Ichiro AU - Niwa, Chisa AU - Tatsuma, Tetsu AU - Nakashima, Tetsuto AU - Iguchi, Taisen AU - Kubota, Yoshinobu AU - Fujishima, Akira PY - 2002/10/01/ UR - http://dx.doi.org/10.1021/es011500a ER -