Study On Preparation Of Catalytic Particle Electrode And Degradation Of Humic Acid

In this paper,using the activated carbon powder(PAC)as the carrier,the catalytic particles with different catalytic elements were prepared by impregnation roasting method.The catalytic performance of the catalytic particle electrode was evaluated by the degradation of humic acid(HA).The material properties of the catalytic particle electrode was evaluated by scaining electron microscopy(SEM),adsorption desorption curves,X-ray diffraction(XRD)and X-ray photoelectron energy spectrum(XPS).The influence of electrochemical conditions were studied.Finally,the mechanism of the degradation of HA was analyzed.The main conclusions are as follows:Through the screening of single element and double element,the degradation effect of HA and the energy consumption were compared.Finally,the Co element was selected as the catalytically active component of catalyst.When the calcination temperature was 600℃,the calcination time was 2 h and the concentration of immersion solution was 0.10 mol/L,the PAC-Co prepared under these conditions,after electrolysis for 70 min,the removal rate of COD was 91.5%,the energy consumption is 16.2 kW h/kgCOD.The results of SEM showed that the eatalytic elements were uniformly loaded on the surface of PAC,XRD and XPS results showed that the catalytic active component was mainly CoO,pore size distribution and NZ adsorption desorption curve indicated that compared with PAC the adsorption behavior and the pore size distribution of PAC-Co did not change significantly.The results of electrochemical conditions showed that,when the current was 0.30 A,the initial pH value was 7,electrolyte was 0.03 mol/LNa2SO4 solution,HRT was 8 min,the influent COD concentration was 200 mg/L,under these conditions,PAC-Co has a better treatment effect on HA.After electrolysis for 70 min,the removal rate of UV254 and COD was 97.5%and 95.1%.The results of specific surface area,pore size structure and N2 adsorption desorption curves showed that PAC-Co can still maintain good adsorption performance and pore structure after repeated use.The results of UV-Vis spectroscopy,three-dimensional fluorescence spectroscopy,infrared spectroscopy,gas chromatography-mass spectrometry and electron paramagnetic resonance showed that the aromatic ring structure in the HA molecule was destroyed and the aroma was reduced,and saturated alkanes were produced.The catalytic degradation of HA by PAC-Co was mainly accomplished by the oxidation of.OH and the reduction of.H.Under the synergistic effect of direct degradation and indirect degradation,PAC-Co has excellent degradation ability on HA.