Degradation of glyphosate and AMPA (amino methylphosphonic acid) solutions by thin films of birnessite electrodeposited: A new design of material for remediation processes?
2013
Ndjeri, M. | Pensel, A. | Peulon, S. | Haldys, V. | Desmazières, B. | Chaussé, A.
This paper focuses on the possibility to use birnessite thin films for remediating aqueous solutions containing glyphosate and AMPA, the most found pollutants in environment. Indeed, glyphosate is the pesticide the most used in the world, and AMPA is its main metabolite, more toxic and more persistent than its parent. However, AMPA can also mainly come from the degradation of phosphonic acids present in detergents. We show that birnessite, electrodeposited as thin films onto a cheap transparent semiconductor substrate (SnO2), can significantly degrade and mineralise glyphosate and AMPA. Glyphosate is spontaneously degraded with simultaneous production of AMPA, formaldehyde, phosphate ions, nitrate ions and ammonium ions, without macroscopic modification of birnessite. The last four by-products are also obtained during the degradation of AMPA by birnessite. Various experimental parameters such as temperature, concentration of pollutant, stirring of solution, presence or not of oxygen were studied and a schematic summary of observed evidences was proposed. The good mineralisation yields obtained during glyphosate/birnessite and AMPA/birnessite interactions allow us to envisage a possible application of these thin films for remediation.
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