Herbicides degradation applied to rice culture by electro-oxidative process

• Grant number: 13/15000-6
• Support Opportunities: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): October 01, 2013
• Effective date (End): April 30, 2017
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal Investigator: Marcos Roberto de Vasconcelos Lanza
• Grantee: Fernanda de Lourdes Souza
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 14/02580-7 - Green electrochemical technologies for the treatment of wastewater polluted with herbicides, BE.EP.PD

Abstract

In this project we propose the application of electro-oxidative processes in the elimination of herbicides used in rice culture. These products are undesirable in water due to its high pollution potential and toxicity, which can lead to cancer development and endocrine desregulation. Among the technologies used for wastewater treatment, most are not efficient in removing these contaminants, and they are expensive, require large areas to implement and difficult to automate. The goal of this research is to assess the improvement of existing materials electrodic, coupled processes such as light irradiation and ultrasound, Fenton reactions and applies them in the oxidation of these contaminants. To achieve this goal, taking into account the excellent properties of the anodes of boron-doped diamond for example i) high conductivity, ii) physical and electrochemically stability and iii) wide electrochemical window, it will be emploied in the electrooxidation of herbicides. Furthermore, will be evaluated new gas diffusion electrode modified with metals like niobium, tantalum and molybdenum, among others, the generation of peroxide and the oxidation efficiency of these contaminants. With this modification is expected to increase peroxide generation, and decrease the potential of the cell. Due to limitations of some processes electrodic, this work will investigate the coupled processes such as ultrasonic irradiation or irradiation of light taking into account the ability to break existing bonds in organic compounds and to generate radicals of the high oxidizing power. Another process that will be studied is the conjugation of the reactions of Fenton, photo-Fenton and electro-Fenton with electrodes prepared earlier to increase efficiency and minimize costs in the oxidation of herbicides.

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)

SOUZA, F. L.; ROCHA, R. S.; FERREIRA, N. G.; RODRIGO, M. A.; LANZA, M. R. V.. Effects of coupling hybrid processes on the treatment of wastewater containing a commercial mixture of diuron and hexazinone herbicides. Electrochimica Acta, v. 328, DEC 20 2019. (14/50945-4, 13/15000-6, 17/10118-0)

VANESSA M. VASCONCELOS; FERNANDA DE L. SOUZA; THAIS T. GUARALDO; FERNANDA L. MIGLIORINI; MAURÍCIO R. BALDAN; NEIDENÊI G. FERREIRA; MARCOS R. DE V. LANZA. OXIDAÇÃO ELETROQUÍMICA DOS CORANTES REATIVOS PRETO 5 E AZUL 19 UTILIZANDO UM ELETRODO DE DIAMANTE DOPADO COM BORO NÃO COMERCIAL. Química Nova, v. 39, n. 9, p. 1051-1058, 2016-11-00. (13/15000-6, 11/15811-9, 14/11861-0)