Ferrite Catalytic Ozone Oxidation For The Removal Of Dibutyl Phthalate Compounds In Experimental Study

In this paper, catalysts which were magnetic spinel porous sponge material are preparedby sol-gel using egg white for the catalytic ozonation of water environmental hormonepollutants dibutyl phthalate （DBP）. The surface morphology and structure werecharacterized by BET, VSM, SEM, XRD, FTIR, XPS and other modern testing. Semi-batchexperiments were conducted to investigate the catalytic effect of ozone on degradation ofDBP under different pH value of wastewater, different concentrations of DBP, catalyst dosage,water common ions and other factors with the ozone as a contrast, and the catalystregeneration performance of research are also be discussed, The decomposition of ozone andDBP degradation mechanism involved in the catalytic process were explored by moderntesting methods. Base on what the paper put forward a process of ozone in the catalystsurface adsorption decomposition model and a new catalytic process mechanism.Experimental results showed that, the optimum dosage was0.01g/L of two kinds ofcatalysts in the experiment, and with the dosage of catalysts increased, the removal efficiencydecreased gradually; the best pH for MnFe₂O₄/O₃and NiFe₂O₄/O3are pH=7.7, when pH ishigher than pHPZCof NiFe₂O₄, the effect of the catalyst drops. DBP optimal concentrationwas0.5mg/L, along with DBP concentration increasing, the effect of DBP removal decline,all experiments were consistent with the first-order kinetic equation. Water cations of Na⁺, K⁺,Ag⁺+in experimental concentration does not influence, for the effect of anionic Cl-, SO₄^2-,PO₄^3-, Cl-、SO₄^2-effect on the catalytic experiments are small, but with PO₄^3-,the DBPremoval were decreased by25%and40%within the10min effect or MnFe₂O₄/O₃andNiFe₂O₄/O3.Experimental the relationship of ozone decomposition rate and degradation rate of DBPof NiFe₂O₄in different experimental conditions were analyzed, experimental results showedthat the degradation rate of DBP was linearly related to the average ozone decomposition rate.With the help of tert-butyl alcohol, catalyst before and after the XPS, FTIR and contrastanalysis method, and combining with pH experimental results, a comprehensive analysis ofthe ozone decomposition process in the catalyst surface were studied, when pH=pHPZCofcatalyst, a Five members ring was formed as ozone combined with surface hydroxyl groups,And Ni ion and O^2-in the catalyst of oxidation and reduction process Ni²⁺�'Ni³⁺�'Ni²⁺ to complete the entire process of catalytic decomposition of ozone and a catalyst to heal itself.The experiment shows MnFe₂O₄and NiFe₂O₄two catalyst has the advantages of highefficiency and high magnetic characteristics, good stability, which can be used as a newcatalyst for catalytic ozonation, and has wide application prospect.