Kounaris Fuziki Maria Eduarda, Ribas Laura S, Tusset Angelo Marcelo, Brackmann Rodrigo, Dos Santos Onelia A A, Lenzi Giane Gonçalves
Department of Chemical Engineering, State University of Maringá, Maringá, 87020-900, Brazil.
Department of Chemical Engineering, Federal University of Technology-Paraná, Ponta Grossa, 84017-220, Brazil.
Heliyon. 2023 Feb 11;9(2):e13678. doi: 10.1016/j.heliyon.2023.e13678. eCollection 2023 Feb.
The operating parameters of photolytic and photocatalytic reaction processes directly affect the efficiency in the degradation of compounds. In particular, pH is a variable that needs to be considered as it exerts great influence on adsorption, absorption, solubility, among others. This study describes the application of the photolytic process, at different pHs, in the degradation of different pharmaceutical compounds. Photolytic reactions were performed with the following contaminants: acetylsalicylic acid (ASA), ibuprofen (IBP) and paracetamol (PAR). In addition, a comparison was performed using the commercial catalyst P25. The results indicated a great influence of the pH in the kinetic constant of the photodegradation and in the UV absorbance of the species. In particular, the degradation of ASA and PAR were favored with the reduction of pH, while the degradation of IBU and SA were favored by increasing. Also, the chromatograms indicated that pH may affect the by-products formed. In comparison, the photocatalysis process in the presence of P25 proved to be much more effective, but it was not possible to achieve complete mineralization of the compounds.
光解和光催化反应过程的操作参数直接影响化合物降解的效率。特别是，pH值是一个需要考虑的变量，因为它对吸附、吸收、溶解度等有很大影响。本研究描述了在不同pH值下光解过程在不同药物化合物降解中的应用。使用以下污染物进行光解反应：乙酰水杨酸（ASA）、布洛芬（IBP）和对乙酰氨基酚（PAR）。此外，使用商业催化剂P25进行了比较。结果表明pH值对光降解动力学常数和物种的紫外吸光度有很大影响。特别是，ASA和PAR的降解随着pH值的降低而受到促进，而IBU和SA的降解则随着pH值的升高而受到促进。此外，色谱图表明pH值可能会影响所形成的副产物。相比之下，在P25存在下的光催化过程被证明要有效得多，但无法实现化合物的完全矿化。
