Photodegradation of bisphenol-A in a batch TiO2 suspension reactor.
In this work, the photocatalytic behaviors of bisphenol-A (BPA), which has been listed as one of endocrine disrupting chemicals, were carried out in a batch TiO(2) suspension reactor. The photodegradation efficiency has been investigated under the controlled process parameters including initial BPA concentration (i.e., 1-50 mg L(-1)), TiO(2) dosage (i.e., 5-600 mg/200 cm(3)), initial pH (i.e., 3-11), and temperature (i.e., 10-70 degrees C). It was found that the optimal conditions in the photoreaction process could be coped with at initial BPA concentration=20 mg L(-1), TiO(2) dosage=0.5 g L(-1) (100mg/200 cm(3)), initial pH=7.0, and temperature=25 degrees C. According to the Langmuir-Hinshelwood model, the results showed that the photodegradation kinetics for the destruction of BPA in water also followed the first-order model well. The apparent first-order reaction constants (k(obs)), thus obtained from the fittings of the model, were in line with the destruction-removal efficiencies of BPA in all the photocatalytic experiments. Based on the intermediate products identified in the study, the possible mechanisms for the photodegradation of BPA in water were also proposed in the present study.
Tsai
Wen-Tien
WT
Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung 912, Taiwan. wttsai@mail.npust.edu.tw
Lee
Mei-Kuei
MK
Su
Ting-Yi
TY
Chang
Yuan-Ming
YM
D001559:Benzhydryl Compounds; D004968:Estrogens, Non-Steroidal / Q000737:chemistry / Q000528:radiation effects; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010636:Phenols / Q000737:chemistry / Q000528:radiation effects*; D010782:Photolysis; D013535:Suspensions; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000528:radiation effects*; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D004968:Estrogens, Non-Steroidal; D010636:Phenols; D013535:Suspensions; D014025:Titanium; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds