期刊
TOXICS
卷 10, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/toxics10040168
关键词
AOP; carbamazepine; reactive species; degradation pathway; toxicity
资金
- Ministry of Research, Innovation and Digitalization of Romania, Nucleu Programme-Project [19 04 03 01]
The photocatalytic degradation of carbamazepine (CBZ) in spiked aqueous solutions using a UV/TiO2 system was investigated. The study determined the optimal conditions for the degradation process and proposed a possible degradation pathway. Toxicity and genotoxicity tests confirmed the suitability of the UV/TiO2 system for treating aqueous systems with CBZ content.
Photocatalytic degradation of carbamazepine (CBZ) from spiked aqueous solutions, via a UV/TiO2 system, was investigated, and the optimum photocatalyst type (P25 Degussa) and dose (500 mg/L), as well as irradiation time (45 min), were established. The degradation process kinetics was studied, and a degradation rate constant of 3.14 x 10(-5) M min(-1) was calculated for CBZ, using the Langmuir-Hinshelwood equation. Experiments performed in the presence of scavengers showed that the main reactive species involved in the degradation process are holes and free hydroxyl radicals; superoxide radicals also play a role in CBZ degradation. Eight transformation products of CBZ were identified, and a possible degradation pathway, consisting of four routes, was proposed. Toxicity and genotoxicity tests were also performed for both untreated and treated CBZ solutions, proving that the use of a UV/TiO2 system represents a suitable treatment approach for aqueous systems with CBZ content.
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