Fe Based MOF/Silkworm Excrement-Carbon Aerogel Degradation Of Thiamethoxam By The Synergetic Effect Between Ultrasonic/Light And Fenton Reactions

The widespread use of nicotine pesticides in agriculture.However,the abuse of pesticides and the discharge of pesticide wastewater also do harm to the environment.There have been reports of a threat to the survival of bees by the new type of nicotine insecticides.In order to solve these problems,this paper selects pesticide thiamethoxam as the degradation and utilization of agricultural wastes from silkworm excrement preparation comprising iron silkworm aerogel(FCA)and iron copper based aerogels silkworm(FCCA),and by way of in situ composite and MIL-100(Fe)and MIL-100(Fe/Cu)to form a composite material MIL(Fe)/FCAx and MIL(Fe/Cu)/FCCAx,then using Fenton ultrasound and optical Fenton degradation of different concentration of thiamethoxam solution(60 mg/L and 400 mg/L).By scanning electron microscopy(SEM),energy spectrum analysis(EDS),transmission electron microscopy(TEM),X ray diffraction(XRD),X photoelectron spectroscopy(XPS),specific surface area and pore size analysis(ASAP)characterization,analysis of composite MIL(Fe)/FCAx and MIL(Fe/Cu)/FCCAx the morphology,pore structure,element type and content and crystal structure.The aerogel(FCA and FCCA)doping,composite materials in the thiamethoxam solution pH and catalyst MIL(Fe)/FCAx and MIL(Fe/Cu)/FCCAx repetition times determine degradation effect of composite materials on thiamethoxam.The degradation mechanism was analyzed by TOC total carbon analyzer and ESR electron paramagnetic resonance spectrometer,and the degradation mechanism of MIL(Fe)/FCAx and MIL(Fe/Cu)/FCCAx catalysts was evaluated.Finally by LC-MS/MS liquid chromatography mass spectrometry of MIL(Fe)/FCAx and MIL(Fe/Cu)to analyze the degradation process of/FCCAx degradation of thiamethoxam,determining 2 kinds of catalyst degradation and ultrasonic Fenton photo Fenton degradation of thiamethoxam main intermediates and degradation pathway.Two methods of degradation of thiamethoxam completely,the removal rate of TOC can reach above 95%.