Gao Y.,1799 Jimei Road |
Gao Y.,Chinese Institute of Urban Environment |
Zhang X.,1799 Jimei Road |
Zhang X.,University of Chinese Academy of Sciences |
And 3 more authors.
Fresenius Environmental Bulletin | Year: 2010
The photodegradation of nonylphenol (NP) was investigated in ultra-pure water under natural and simulated sunlight separately, and both of them followed pseudofirst-order kinetics. The rate constants and half-lives were 2.25×10-2 h-1 and 30.8 h under solar irradiation, and 1.68×10-2 h-1 and 41.3 h under simulated sunlight, respectively. The effects of initial pH and concentrations of humic acid (HA), NO3 -, Fe(III) and hydrogen peroxide (H 2O2) on photodegradation of NP were also studied separately under simulated sunlight. It was found that NP 8 hremoval increased from 8.5% to about 35% when the pH rose from 4.3 to 9.5. The rate of NP photodegradation was accelerated to different extent in the presence of HA, NO3 -, Fe(III) or H2O2. The maximum NP decay was obtained at the addition of 5 mg/l HA, 50 mg/l NO3 -, 50 mg/l Fe(III) and 147 mmol/l H2O2 at pH 7.3, respectively. These results showed that photolysis was an effective way to abate NP pollution in natural waters with the acceleration effects of these photoactive matters. In addition, the decomposition products were identified by hybrid quadrupole time of flight mass spectrometer (Q-TOF). In the absence of photoactive matters, hydroxy phenylpropanol and allyl phenol were identified as two possible photoproducts of NP and the photodegradation of NP could involve the attack by OH radicals in the presence of the photoactive matters. © by PSP.