Mineralization of Organophosphorous Pesticides by Electro-generated Oxidants

Abstract

In this study we have investigated organophosphorous pesticides destruction by oxidizing system, which was synthesized in the polluted aqueous sulfuric acidic solutions by constant current conducting. Bulk electrolyses with lead electrode were performed in an undivided cell under amperestatic conditions to study the oxidative cleavage of commercial pesticides and pure active ingredients. The pesticides were completely destroyed following pseudofirst-order kinetics estimated according to chemical oxygen demand (COD) data and phosphate ions accumulation. The assessment of decay rate constants shows the high mineralization degree. Moreover, the general current efficiency corresponds to high impact of chemical reactions in the bulk along with electrochemical interactions and defines the reasonable treatment process time as 120 min. The decay rate constants obtained by phosphate formation are higher for glyphosate than rate constants estimated by COD. It may be explained by P-C bond breaking and phosphate ions cleavage. For further study of organophosphorous pesticides oxidation pathways in detail by described process, the conditions of electrolysis should be milder

Novel integrated electrodialysis/electro-oxidation process for the efficient degradation of 2,4-dichlorophenoxyacetic acid

“…The research efforts devoted to the development of environmental applications of electrochemical technologies has notably increased within the last decades Feng et al, 2016). For the particular case of pesticide removal, many studies have been conducted in the recent years, looking for operation conditions or combination of processes that helps to attain high degradation efficiencies (Muff et al, 2009;Fontmorin et al, 2012;Kukurina et al, 2014;Souza et al, 2016) in the depletion of these hazardous species.…”

Comparing geometric parameters of a hydrodynamic cavitation process treating pesticide effluent

“…For achieving effective removal of pollutant, ideal treatment method should be qualified/appropriate, should perceive complete mineralization rapidly and should be suitable for small-scale waste applications [13]. Advanced Oxidation Potential (AOP's) are now-a-days preferred methods in dealing with pesticide degradation [1,14].…”

Photocatalytic degradation of an organophosphorus pesticide from agricultural waste by immobilized TiO2 under solar radiation

“…Beside these, removal of phosphorus from pesticidal effluents can be achieved by combined chemical-biological treatment. Also, among novel techniques, advanced oxidation processes (AOPs) have been widely used (Kukurina et al, 2014) Advanced oxidation processes (AOPs) have been widely used for environmental remediation applications. Heterogeneous photocatalysis using a solid photocatalyst under UV irradiation produces highly oxidative species (reactive free radicals) (Rammohan and Nadagouda, 2013).…”

“…For the process using TiO 2 doped with nitrogen, the pesticide has been mineralized at 45 and 75 minutes of treatment, respectively. Kukurina et al (2014) studied the electro-generated oxidizing system for efficient mineralization of toxic OPs, such as glyphosate, malathion, bazudin, chlorophos and methaphos. Aqueous sulfuric acidic polluted solutions have been electrolyzed with lead electrodes in an undivided electrolytic cell.…”