Journal
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
Volume 24, Issue -, Pages -Publisher
UNIV FED SAO CARLOS, DEPT ENGENHARIA MATERIALS
DOI: 10.1590/1980-5373-MR-2021-0212
Keywords
Photodegradation; Titanium Dioxide; Zinc Oxide; Paracetamol; Salicylic Acid
Categories
Funding
- National Council for Scientific and Technological Development (CNPq) [303485/2019-1, 152519/2019-0, 305541/2017-0, 302769/2018-8]
- National Institute of Science and Technology (INCT-BioNat) [465637/2014-0]
- State of Sao Paulo Research Foundation (FAPESP) [2016/20549-5, 2019/184455]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001]
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The presence of amino/amide group significantly decreases the efficiency of degradation. Salicylic acid can improve the degradation of paracetamol. The deactivation of excited states may be related to the lower efficiency of photodegradation of amino-based compounds.
Titanium dioxide (TiO2) and zinc oxide (ZnO) are among the most used catalysts in photodegradation. Paracetamol and salicylic acid are widely used as pharmaceutical drugs. We found that paracetamol is less susceptible to photodegradation compared to salicylic acid. From a chemical perspective, this was not expected since paracetamol is more vulnerable to chemical oxidation. Aiming the comprehension of this phenomenon, studies were performed comparing the efficiency of photodegradation of paracetamol versus salicylic acid and acetophenone versus 4-aminoacetophenone. The presence of amino/amide group decreased the efficiency of degradation significantly. It was also found that salicylic acid improved the degradation of paracetamol when both compounds were present in the reaction medium. The lower efficiency of photodegradation of the amino-based compounds seems to be related to the deactivation of the excited states of the TiO2 and ZnO. Theoretical calculations at the TD-PBE0/6-311++G(3df,2p) high level were performed and corroborated our proposal.
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