Photochemical and photocatalytic degradation of 1-propanol using UV/H2O2: Identification of malonate as byproduct

Autor(es)

Ferreira Santos, Mauro Sergio ^{[1, 2]} ; Cordeiro, Thiago Gomes ^{[3, 1]} ; Cieslarova, Zuzana ^[1] ; Rolf Gutz, Ivano Gebhardt ^[1] ; Garcia, Carlos D. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 - USA

^[3] Clemson Univ, Dept Chem, Clemson, SC 29634 - USA

• Tipo de documento: Artigo Científico
• Fonte: ELECTROPHORESIS; v. 40, n. 18-19, p. 2256-2262, SEP 2019.
• Citações Web of Science: 1

Resumo

1-propanol is a primary alcohol extensively used in the pharmaceutical, chemical, and food industries. It has been also found as a contaminant in the atmosphere and is considered a model compound to mimic the behavior and fate of aliphatic alcohols exposed to environmental conditions. In order to understand that role of relevant variables, this paper presents results obtained with a simple experimental set-up to investigate the reactivity of 1-propanol under mild oxidizing conditions. Coupling this system with CE-(CD)-D-4 allowed the quantification of the carboxylic acids formed. For the described experiments, aqueous solutions of 1-propanol were placed inside a photoreactor and oxidized upon the addition of TiO2 and/or H2O2. According to the described results, the addition of H2O2 (0.1% w/w) was the most significant variable, roughly tripled the amount of carboxylic acids generated and led to the conversion of up to 70% of the initially available 1-propanol (1 mmol/L). More importantly, the reaction yielded the formation (within 10 min) of propionate (50 mu mol/L), acetate (400 mu mol/L), formate (50 mu mol/L), and malonate (200 mu mol/L). The latter is critically important because it represents the first example of the photochemical oxidation of both terminal carbons of the C-3-chain of 1-propanol under mild conditions, and opens new avenues for the production of this important chemical building block. (AU)

• Processo FAPESP: 12/06642-1 - Formação e propriedades de adutos de hidróxi-compostos orgânicos com carbonato em meio aquoso e condições biológicas
• Beneficiário: Claudimir Lucio Do Lago
• Modalidade de apoio: Auxílio à Pesquisa - Regular