Fe - Ni - Al - Mmt Catalytic Hydrogen Peroxide Oxidation Degradation Of Acid Orange Ⅱ Research

Dye wastewater is one of the major industrial wastewater. With the rapid development of the dye industry in recent years, a large quantity of wastewater emission of the dye industry is serious harmful to the ecological balance. The dye wastewater containing dye and related compounds have received increased attention because of toxicity and prevalence. In this paper, a typical azo dye acid orange II is selected as the object of study. Iron (Fe) and nickel (Ni), the transition metals, as the active component of the catalyst; the montmorillonite (MMT) as the supporter. Series of Fe-Ni-Al-MMT catalysts is prepared by ion exchange method. In order to overcome the traditional heterogeneous catalytic wet oxidation technology’s drawback, we choose heterogeneous catalytic wet peroxide oxidation technology to degrade the stimulated wastewater.According to pre-experiment data and X-ray diffraction (XRD), ICPS, BET surface characterization methods, the best catalyst has been filtered mainly in three fields:the active metal content (Fe+Ni)/(Fe+Ni+Al), Fe/Ni ratio and the calcinated temperature. The results show that (Fe+Ni)/(Fe+Ni+Al)=6%, Fe/Ni=4:6and the calcinated temperature is equal to500℃. The catalyst shows high catalytic activity, the color and COD removal of the wastewater is equal to99.8%and72.32%, respectively. According to the characterization results, the pillared MMT d001increases from1.527nm to1.780ran and the SBET increases from42.03m2/g to151.9m2/g. At the same time, the Fe and Ni contents of the pillared MMT increase0.827%and0.0044%.The best Fe-Ni-Al-MMT is selected as a catalyst for CWPO (catalytic wet peroxide oxidation) of simulated acid orange Ⅱ wastewater. The catalyst’s performance in CWPO is analyzed under different operating conditions such as the reaction time, reaction temperature, initial pH and H2O2concentration. Fe-Ni-Al-MMT catalyst was reused under operating conditions (reaction temperature is60℃, pH initial=3.0,[H2O2]0=24mmol/L, Wcat=0.5g/L), the solids shows high stability in the reaction due to strong interaction between the active metal species and the catalyst support(MMT). The apparent kinetics of catalytic wet peroxide oxidation degradation acid orange II is investigated in detail. The apparent reaction order of H2O2is0.17, the apparent reaction order of acid orange Ⅱ is0.73. The apparent activation energy Ea=1.22kJ/mol, it indicates that the Fe-Ni-Al-MMT effectively reduce the activation energy of the catalytic reaction.