脉冲电解法处理刚果红废水的降解及其机理研究
[Abstract]:Dye wastewater has the characteristics of high chromaticity, strong toxicity, great harm, difficult to degrade, and has a serious impact on the environment. How to degrade dye wastewater efficiently and quickly has always been a hot topic in environmental protection. Because of its advantages of low energy consumption, simple operation and no secondary pollution, pulse electrocatalytic oxidation has attracted wide attention in the field of treatment of refractory organic wastewater. In this paper, Congo red dye wastewater was treated by pulse electrocatalytic oxidation. The factors affecting the degradation process, degradation products and degradation mechanism were systematically studied. In this paper, the effect of various factors on decolorization of Congo red was studied by single factor method. The experimental results show that the decolorization rate of Congo red decreases with the increase of initial concentration and pH value, and with the concentration of electrolyte, the peak value of pulse voltage. The increase in frequency and duty cycle increases. Based on the single-factor experimental results, the response surface analysis shows that the peak pulse voltage has the greatest influence on the decolorization rate, and the interaction between the NaCl concentration and the initial pH value is the strongest. By verifying the relationship between TOC removal rate and decolorization rate, it is concluded that with the change of peak pulse voltage or initial concentration of Congo red, the change trend of TOC removal rate and decolorization rate of Congo red remains consistent, but the removal rate of TOC is lower than that of decolorization. By comparing the energy consumption of the system with unit TOC at different peak voltages, it is concluded that when the peak value of pulse voltage is 15 V, the system energy consumption performance ratio is the highest. The degradation pathways of Congo red were obtained by ion chromatography and LC-MS analysis. The degradation pathways of Congo red were as follows: Naphthol naphthoquinone, ketones, carboxylic acid CO2 and H _ 2O, but only a small part of Congo red was completely degraded. Therefore, the removal rate of TOC is low. Then the hydroxyl radical was detected by high performance liquid chromatography, and the decolorization effect was compared under the condition that hydroxyl radical and chlorine ion acted separately, and the pulse electrocatalytic oxidation process was obtained. The main mechanism of electrolysis is the indirect oxidation of chloride ions.
【学位授予单位】:华中科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:X791
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