tailieunhanh - Study of some parameters responsible for glyphosate herbicide mineralization by electro-fenton process
Glyphosate (C3H8NO3P) is a highly effective broad-spectrum, post-emergence, nonselective organophosphate herbicide and commonly applied in Viet Nam. The removal of glyphosate in aqueous solution has been investigated by electro - fenton process which is based on the continuous production of ●OH radicals by reaction between Fe2+ catalyst and H2O2 electrochemical generated on cathode. | Vietnam Journal of Science and Technology 55 (4C) (2017) 238-244 STUDY OF SOME PARAMETERS RESPONSIBLE FOR GLYPHOSATE HERBICIDE MINERALIZATION BY ELECTRO - FENTON PROCESS Thanh Son Le1, *, Tuan Duong Luu1, 2, Tuan Linh Doan1, Manh Hai Tran1 1 Insitute of Environmental Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam. 2 Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam * Email: Received: 11 August 2017; Accepted for publication: 16 October 2017 ABSTRACT Glyphosate (C3H8NO3P) is a highly effective broad-spectrum, post-emergence, nonselective organophosphate herbicide and commonly applied in Viet Nam. The removal of glyphosate in aqueous solution has been investigated by electro - fenton process which is based on the continuous production of ●OH radicals by reaction between Fe2+ catalyst and H2O2 electrochemical generated on cathode. The carbon felt (60 cm2) and Pt gauze (45 cm2) were used as cathode and anode of the electro-fenton system, successively. Monitoring the total organic carbon (TOC) during the electrolysis proved that pH, current intensity, electrolysis time and catalyst concentration influenced the glyphosate mineralization efficiency. At the optimal conditions: [Fe2+] = mM; pH = 3; [Na2SO4] = ; I = and the compressed air was bubbled through the solutions, the experiment results showed that % Glyphosate was mineralized to CO2, H2O and inorganic acid after 50 min. Keywords: electro-fenton, glyphosate, felt carbon, mineralization. 1. INTRODUCTION As an agriculture-based country, Vietnam’s demand for pesticides is very high and this demand increased every year according to the agricultural growth. However, their overuse, incorrect use and storage have posed a serious threat to health and aquatic ecosystems in agricultural areas. Moreover, most of storehouses were seriously downgraded, the drainage system at the warehouse was almost poor, so .
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