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Degradation of Carbamazepine from Aqueous Solutions via TiO2-Assisted Photo Catalyze.


ABSTRACT: 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 × 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.

SUBMITTER: Constantin MA 

PROVIDER: S-EPMC9032724 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature

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Degradation of Carbamazepine from Aqueous Solutions via TiO<sub>2</sub>-Assisted Photo Catalyze.

Constantin Mirela Alina MA   Chiriac Florentina Laura FL   Gheorghe Stefania S   Constantin Lucian Alexandru LA  

Toxics 20220331 4


Photocatalytic degradation of carbamazepine (CBZ) from spiked aqueous solutions, via a UV/TiO<sub>2</sub> 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 × 10<sup>-5</sup> M min<sup>-1</sup> was calculated for CBZ, using the Langmuir-Hinshelwood equation. Experiments performed in the presence of scavengers sh  ...[more]

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