| Autor: |
Tran MH; Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam., Nguyen HC; Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam., Le TS; Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam., Dang VAD; School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam., Cao TH; Center for Environmental Technology & Sustainable Development (CETASD), Hanoi University of Science (HUS) - Vietnam National University, Hanoi, Vietnam., Le CK; Graduate University of Science & Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam., Dang TD; School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam. |
| Abstrakt: |
An electro-Fenton system, which consists of a Pt gauze anode and a commercial carbon felt cathode, is commonly employed to generate in situ hydrogen peroxide, hydroxyl radical and regenerate ferrous catalyst for glyphosate degradation (a widely used herbicide in Vietnam) in aqueous solution. The absorbance measurements used to determine the glyphosate concentration during the electrolysis proved that glyphosate was degraded by pseudo-first-order kinetic. The influence of pH, current density, catalyst concentration and initial content of the glyphosate on mineralisation efficiency were studied by monitoring the total organic carbon (TOC) and hydrogen peroxide concentration during electrolysis. The results show that the maximal removal percentage of glyphosate was 91.91% with applied current density of 10 mA cm -2 , pH 3, 0.1 mM Fe 2+ , 0.05 M Na 2 SO 4 , and 0.1 mM glyphosate in 40 min. The degrading rate constant of glyphosate degradation was calculated to be k app = 0.063 min -1 . In this 91.91% removal, 81.65% of glyphosate was mineralised and the remainder consists of intermediates produced during the electro-Fenton process. |
