Degradation Application Of NiFe₂O₄-CoFe₂O₄/TiO₂/reduced GrapHite Oxide Three-dimensional Electrode Material In Dye Wastewater

In this paper,the problems of difficult recovery and low visible light catalytic activity of nano-TiO₂ catalysts are addressed,the NiFe₂O₄-CoFe₂O₄/TiO₂/reduced graphite oxide three-dimensional particle electrode was prepared,and the simulated printing and dyeing wastewater:Rhodamine B and Malachite Green solution were degraded by photocatalytic oxidation method.Taking the efficiency of degrading simulated printing and dyeing wastewater as an index,the process conditions for preparing three-dimensional particle electrode materials,such as the proportion of Co,the preparation method,and the calcination temperature,were optimized.The results show that when the proportion of Co is 0.2,when the sol-gel method is used,and the calcination temperature is 500?,the prepared particle electrode has better UV photocatalytic performance.SEM results show that the three-dimensional particle electrode has a porous and sparse structure with obvious grain morphology and high dispersion.BET analysis and calculation showed that the specific surface area of the particle electrode was 124.1 m~2/g.Using rhodamine B and malachite green solutions to simulate dye wastewater,the experiments were carried out by controlling parameters such as applied voltage,dosage of particle electrode,initial concentration of organic dye and initial p H value.The results show that:when the applied voltage is 9 V and the dosage of NiFe₂O₄-CoFe₂O₄/TiO₂/reduced graphite oxide three-dimensional particle electrode is 10 g/L,the photocatalytic degradation of Rhodamine B solution with an initial concentration of12 mg/L and p H=3,the complete degradation rate was 99.24%within 120 min when first used,and after 4 cycles,the complete degradation efficiency within 90 min still reached 91.47%.When the applied voltage intensity was 10 V,the dosage of NiFe₂O₄-CoFe₂O₄/TiO₂/reduced graphite oxide three-dimensional particle electrode was 10 g/L,and the photocatalytic degradation of malachite green solution with initial concentration of 10 mg/L and p H=5 was achieved for the first time.The complete degradation rate was 99.72%within 120 min of use,and after 4 cycles,the complete degradation rate was 90.21%within 90 min..