Electrochemical Degradation of Diuron in Chloride Medium using DSA Based Anodes
نویسندگان
چکیده
Este trabalho apresenta um estudo da degradação do herbicida diuron utilizando os anodos Ti/RuxTi(1-x)O2 e Ti/IrxTi(1-x)O2 (x = 0,3, 0,5 e 0,7). A investigação da degradação foi conduzida na presença e na ausência de cloreto. O estudo da remoção do herbicida em função da densidade de corrente na ausência de cloreto rendeu remoções de 41 e 49% de demanda química de oxigênio (COD) e remoções de 10 e 14% de carbono orgânico total (TOC) a 100 mA cm, respectivamente. Mantendo-se o tempo de eletrólise constante (4 h), a composição do anodo Ti/Ru0,7Ti0,3O2 foi determinada como a mais ativa para remoção do diuron e seu subproduto. O valor de remoção máximo atingido após 4 h foi 58%. A adição de cloreto dobrou a taxa de remoção, e obteve-se 100% de remoção de COD para Ti/Ru0,3Ti0,7O2. A análise por cromatografia líquida de alto rendimento (HPLC) confirmou a remoção total do herbicida em meio de cloreto e indicou a formação de subprodutos de degradação. Os subprodutos gerados são apresentados em função da densidade de corrente aplicada e da composição do anodo. Os anodos baseados em Ir promoveram a oxidação de maneira mais branda e forneceram mais subprodutos em meio aquoso.
منابع مشابه
Improved Mechanical and Electrochemical Properties of Artificial Graphite Anode Using Water-Based Binders in Lithium-Ion Batteries
In recent years, many studies have focused on the active materials of anodes to improve the performance of LIBs, while limited attention has been given to polymer binders, which act as inactive ingredients. However, polymer binders have amazing influence on the electrochemical performance of anodes. Herein, to investigate the binding performance between MCMB artificial graphite and the copper c...
متن کاملElectrochemical Degradation of Chlorpyrifos in Aqueous Solutions Using G/nb2o5 and Nb/nb2o5 Electrodes
Glass/Nb2O5 and Nb/Nb2O5 electrodes were prepared by electrodeposition and used as anodes for electrochemical degradation of chlorpyrifos (CPF) in aqueous solution. Different operating conditions and factors affecting the treatment process including current density, temperature, initial concentration of chlorpyrifos, pH, conductive electrolyte and time of electrolysis were studied and optimized...
متن کاملStudy of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) in chloride medium at boron doped diamond (BDD) and platinum anodes.
For electrochemical oxidation to become applicable in water treatment outside of laboratories, a number of challenges must be elucidated. One is the formation and fate of degradation intermediates of targeted organics. In this study the degradation of the pesticide residue 2,6-dichlorobenzamide, an important groundwater pollutant, was investigated in a chloride rich solution with the purpose of...
متن کاملHalotolerance, ligninase production and herbicide degradation ability of basidiomycetes strains
Fungi have been recently recognized as organisms able to grow in presence of high salt concentration with halophilic and halotolerance properties and their ligninolytic enzyme complex have an unspecific action enabling their use to degradation of a number of xenobiotic compounds. In this work, both the effect of salt and polyols on growth of the basidiomycetes strains, on their ability to produ...
متن کاملElectrochemical performance of lithium ion battery, nano-silicon-based, disordered carbon composite anodes with different microstructures
Nano-silicon-based disordered carbon composites prepared by mechanical milling and pyrolysis have been examined as anodes of a lithium ion cell. Electrochemical measurements show that the charge–discharge capacity of disordered carbon composites incorporating both silicon-polyparaphenylene (Si-PPP) and silicon-polyvinyl chloride (Si-PVC) with differing silicon contents, decreases with increasin...
متن کامل