Journal
ENVIRONMENTAL RESEARCH
Volume 194, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.110678
Keywords
Photodegradation; 5-methylbenzotriazole; 5-chlorobenzotriazole; Benzotriazole; Humic acid
Funding
- National Natural Science Foundation of China [NSFC 41877359]
- Guangdong Provincial Natural Science Foundation [2020A1515010448]
- Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety [2019B030301008]
Ask authors/readers for more resources
This study investigates the photochemical behavior of 5-TTri and CBT in aqueous solutions under UV radiation, revealing their photolysis rates are influenced by pH, salinity, metal ions, and humic acid. Experimental data suggests tentative photo transformation schemes for both compounds, involving various photoproducts through bond scission and dechlorination processes.
5-methylbenzotriazole (5-TTri) and 5-chlorobenzotriazole (CBT) are two benzotriazole derivatives widely used in various industrial and domestic applications. This paper reports on the photochemical behaviour of 5-TTri and CBT in aqueous solutions under UV radiation at 254 nm and the influences of pH, salinity, metal species and humic acid (HA) on their photo-transformation processes. The photolysis of 5-TTri and CBT under the exposure to UV light were found to follow the first-order reaction kinetic in all cases with half-lives ranging from 7.1 h to 24.3 h for 5-TTri and 5.1 h-20.5 h for CBT in various aqueous solutions containing metal ions and HA. The photolysis rates for both 5-TTri and CBT were strongly dependent on the solution pH value, and decreased with increasing solution pH. Salinity, metal species Cu2+ and Fe3+, and especially HA had inhibitory effects on the photolysis of 5-TTri and CBT under UV light irradiation at 254 nm. We proposed the tentative photo transformation schemes for both 5-TTri and CBT, which involved two photoproducts (4-methylaniline and N, N-diethylaniline- p-toluidine) and three photoproducts (4-chloroaniline, Aniline and 2,6-diethylaniline), respectively, via N-N and N-NH bond scission and dechlorination process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available