Abstract
The Fe-Co-Ce composite catalysts were prepared by co-precipitation method, and the effect of calcination temperature and calcination time on the performances of the Fe-Co-Ce composite catalysts were investigated. The results indicated that the optimum calcination temperature and calcination time of the Fe-Co-Ce composite catalysts were 450 °C and 7 h, respectively. Using the catalysts which prepared under the optimum calcination conditions catalytic wet oxidation of methyl orange simulated wastewater, after 90 min, the COD, COD removal rate, absorbance, decolorization rate and pH of the methyl orange simulated wastewater were 737.7, 70.5%, 0.348, 95.3%, and 5.31, respectively. According to the analyses of the SEM, FTIR, and TG-DTA curves, the components of the catalysts which prepared under the optimum calcination conditions distributed evenly, and the chemical compositions of the catalysts including C-O, -OH, and H-O-H, showing a good thermal stability.
Highlights
With the rapid development of industry, environmental pollution has become a huge problem for human survival and development
There are a lot of wastewaters discharged from printing and dyeing plants every day, and it is difficult to dispose the organic industrial wastewaters, because they are usually composed of high-concentration of refractory biochemical organic pollutants, ammonia nitrogen compounds, and suspended matters or other pollutants, which cause a serious pollution for the natural water [1]
The calcination temperature and calcination time of the Fe-Co-Ce composite catalysts have a significant impact for the performance of catalytic wet oxidation, so it is necessary to find the optimum calcination conditions of the catalysts before catalytic wet air oxidation of wastewater
Summary
With the rapid development of industry, environmental pollution has become a huge problem for human survival and development. Compared with the conventional treatment method, catalytic wet oxidation is widely used in wastewater treatment due to the advantages of wide application range, quick oxidation rate and less secondary pollution, less energy consumption. The transition metal can effectively improve the catalytic performance of noble metal catalysts, due to the synergistic effect between transition metal and noble metal [7]. The calcination temperature and calcination time of the Fe-Co-Ce composite catalysts have a significant impact for the performance of catalytic wet oxidation, so it is necessary to find the optimum calcination conditions of the catalysts before catalytic wet air oxidation of wastewater. The Fe-Co-Ce composite catalysts were prepared by co-precipitation method, investigating the effect of calcination temperature and calcination time on the performance of catalytic wet air oxidation, and the structure and thermal stability of the catalysts were determined by SEM, FTIR, and TG-DTA
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