Research Of Benzidine Micro And Nano Fe₃O₄ Material Degradation Activation S₂O₈^2-

The sulfate radical-based advanced oxidation processes could produce SO4·- with strong oxidation. Lots of persistent organic pollutants were degraded by the SR-AOPs, which we chosed to degrade benzidine in this study. Four kinds of nanospheres were prepared to activate S2O82- and characterized. The influence of benzidine degradation and degradation products were investigated. The main contents were shown as the following:1. The conclutons of thermally activated persulfate degradate benzidine experiments showed that:Both Na2S2O8 and K2S2O8 can degradate benzidine well. The degradation efficiency of benzidine was improveed with increasing dosage of sodium persulfate. The dosage of sodium persulfate was added to 5 times at 14mL best. The activation energy of benzidine was 78±0.7 KJ/mol when temperature was below 60℃.60℃ is the best temperature degradation reactions, the efficiency was inhibited with the higher or lower temperature.The initiation efficiency was best when the pH is 6, or the degradation were inhibited. The removal efficiency of benzidine and TOC was above 80%after reacted in 60 mins.2. Four kinds of Fe3O4 were prepared,and characterized by TEM, SEM, XRD and other methods. All the product of preparation are Fe3O4. The TEM and SEM showed that the products were hollow microspheres of 600 nm,180 nm the microspheres, nanospheres of 100 nm and 150 nm～2μm flap.3. The conclutons of Fe3O4 activated persulfate degradate benzidine experiments showed that:The removal efficiency of adding the castalyst was 30% more than not added. A grate impact of the adsorption efficiency were decided by pH. high adsorption efficiency hollow Fe3IO4 in a neutral and extremely acid conditions, while the highest were prepared Fe3O4 ion adsorption efficiency when under alkaline conditions. Fe3O4 dosing showed little effect on efficiency when 10 mg best. The degradation efficiency increases with increasing temperature and improve, but it will inhibit the degradation reaction when the temperature higher than 60℃.It worked best with neutrality and inhibited in acidic expect of he ionic liquid prepared Fe3O4. Fe3O4 can be recycled many times experiments with minimum loss and got degradation efficiency after six cycles as high as 90%. The benzidine degraded into small molecular amides, alcohols, inorganic substances and other easily degradable substances eventually by analysis of UV-vis and FT-IR.