Preparation Of Composite Metal Oxides And Applications On Treatment Of Phenol Wastewater

In this paper, the composite transition metal oxide catalysts were synthesized and used to treat the simulative phenol-containing wastewater via the CWPO method. A series of composite metal oxide were prepared by the co-precipitation method on the basis of largely literature consulting. The compositions and morphologies of the obtained products were examined by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and other modern testing techniques. The catalysts with higher catalytic activities from the as-prepared composite metal oxides were selected to treat the phenol wastewater and then the process conditions of the synthesis and the wastewater treatment were optimized by single factor and orthogonal experiments. The optimized process conditions of the synthesis were obtained as follows:Using (NH4)2CO3as coprecipitator agent; the aging time is4h; the calcination temperature is600℃; the calcination time is3h and the ratio of active constituents is1:1:1. The process conditions of wastewater treatment were optimized as follows:1000mg/L for initial phenol concentration of wastewater;0.0375g/L for catalyst addition;35mL/L for20%H2O2addition;50℃and2h as the treatment temperature and time. Four repeated experiments showed that the average degradation rate of COD and volatile phenol are93.77%and98.48%, respectively.