Study of influence of substituents in carboxylic acid structure in the electrochemical oxidation of these compounds in nickel and platinum nanoparticles modified boron-doped diamond electrodes

• Grant number: 14/10391-0
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• Effective date (Start): September 01, 2014
• Effective date (End): February 28, 2015
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Nelson Ramos Stradiotto
• Grantee: Graziela Cristina Sedenho
• Supervisor: Richard G. Compton
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Research place: University of Oxford, England
• Associated to the scholarship: 13/09833-5 - Development of electrochemical detector for high performance liquid chromatography based on a modified electrode with metal nanoparticles for carboxylic acids determination in sugar cane vinasse, BP.MS

Abstract

Vinasse is a liquid byproduct of alcohol production industry . The organic matter present in this matrice is mainly constituted of carbohydrates, alcohols, organic acids and sometimes amino acids. In the case of sugar cane vinasse, lactic acid, glycerol, ethanol and acetic acid are the majority of organic components. Among these compounds, the carboxylic acids are important because they are in significant concentrations in the sugar cane vinasse and show industrial importance. Due to the their importance, several methods have been developed for the determination of carboxylic acids, including electrochemical methods.The determination of carboxylic acids can be made by the electrooxidation of these compounds. This reaction of carboxylic acids is called Kolbe reaction or Kolbe electrosyntesis, which consists of the oxidative decarboxylation of a carboxylic acids or carboxylates with the formation of dimers and carbon dioxide. Depending on the experimental conditions, such as anode material, anode potential, pH, solvent, temperature, addittion of electrolytes and molecular structure, the reaction may follow some pathways and generate various products. The main goals of this project are to evaluate the influence of hydroxyl substituents in carboxylic acid structure in the electrochemical oxidation of these compounds and to compare nickel and platinum nanoparticles modified boron-doped diamond electrodes. These studies can help to understand the distinct analytical responses of carboxylic acids with different structures. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SEDENHO, GRAZIELA C.; LEE, PATRICIA T.; TOH, HER SHUANG; SALTER, CHRIS; JOHNSTON, COLIN; STRADIOTTO, NELSON R.; COMPTON, RICHARD G.. Nanoelectrocatalytic Oxidation of Lactic Acid Using Nickel Nanoparticles. Journal of Physical Chemistry C, v. 119, n. 12, p. 6896-6905, MAR 26 2015. (14/10391-0)

SEDENHO, GRAZIELA C.; LEE, PATRICIA T.; TOH, HER SHUANG; SALTER, CHRIS; JOHNSTON, COLIN; STRADIOTTO, NELSON R.; COMPTON, RICHARD G.. The Electro-Oxidation of Lactic Acid at Platinum Microparticles and Polycrystalline Platinum Electrode. International Journal of Electrochemical Science, v. 11, n. 3, p. 2166-2176, MAR 2016. (14/10391-0, 14/23846-5)