Study On The Catalytic Degradation Of Dye Wastewater Using CoFe/MgO-Fenton Process

As an advanced oxidation technology, heterogeneous Fenton system has a good perspective to dispose vast amounts of deep color, toxic, non-biodegradable dyeing wastewater. However, heterogeneous Fenton catalysts have some problems such as high cost, the leakage of effective components, the limited range of pH value, and requiring additional energy. In this article, we prepared a novel, magnetic CoFe/MgO heterogeneous Fenton catalyst used LDHs as single precursors for degrading Orangeâ…¡dyeing wastewater, making the alloy catalyst applied in the field of water treatment for the first time. The main research contents and the results are as follows.First, we studied the effect of the composition and preparation temperature of the catalyst on catalytic degradation of Orangeâ…¡. The results show that the degradation rate gradually increases with the increasing of Co/Fe ratio (x= 0â†'1.5) in the CoxFe1.0/(MgO)3.5 under the same reaction conditions, in addition, the increase of carrier (y=0â†'3.5) in Co1.5Fe1.0/(MgO)y improve the degradation rate; and the efficiency of catalytic degradation increases with the preparation temperature of the catalysts simultaneously. According to experiment results, the degradation rate of Orange II can reach to 98% when use the catalyst with the element ratio of Mg/Co/Fe=3.5/1.5/1.0 and prepared temperature at 950℃.Due to the excellent catalytic degradation performance on Orange II of the Co1.5Fe1.0/(MgO)3.5 catalyst, we further investigate the the influence of reaction conditions on the catalytic properties. The results illustrate that when the catalyst dosage is 0.1 g/L and the concentration of H2O2 is 2.1 mM, the degradation efficiency is obvious better than the traditional homogeneous fenton system in a wide pH (5.4～9.0) value range. Furthermore, the catalyst has a good stability and can be used in a wide range of temperature.In a word, the catalyst mentioned in this article has the advantages such as wide range of pH values, without additional energy, good stability, and high degradation efficiency and easy separation. These advantages make the catalyst has a wide application prospect in the field of wastewater treatment.