Journal
MOLECULES
Volume 27, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/molecules27103349
Keywords
benzotriazole UV stabilizers; peracetic acid; advanced oxidation processes; iron ions; cobalt ions
Funding
- National Science Centre Poland [2019/33/B/NZ8/00012]
- Innovation Incubator 4.0 program of the Polish Ministry of Science and Higher Education
- European Union under the European Regional Development Fund
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Benzotriazole UV stabilizers (BUVs) are widely used for their UV absorption properties but have adverse effects on the environment and living organisms. This study explores the chemical oxidation of five UV filters from the benzotriazole group using peracetic acid and metal ions, revealing first order kinetics and oxidation mechanisms of the compounds.
Benzotriazole UV stabilizers (BUVs) have gained popularity, due to their absorption properties in the near UV range (200-400 nm). They are used in the technology for manufacturing plastics, protective coatings, and cosmetics, to protect against the destructive influence of UV radiation. These compounds are highly resistant to biological and chemical degradation. As a result of insufficient treatment by sewage treatment plants, they accumulate in the environment and in the tissues of living organisms. BUVs have adverse effects on living organisms. This work presents the use of peracetic acid in combination with d-electron metal ions (Fe2+, Co2+), for the chemical oxidation of five UV filters from the benzotriazole group: 2-(2-hydroxy-5-methylphenyl)benzotriazole (UV-P), 2-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol (UV-326), 2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol (UV-327), 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol (UV-328), and 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol (UV-329). The oxidation procedure has been optimized based on the design of experiments (DoE) methodology. The oxidation of benzotriazoles follows first order kinetics. The oxidation products of each benzotriazole were investigated, and the oxidation mechanisms of the tested compounds were proposed.
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