Preparation Of Multi-component Metal Oxides Supported Activated Carbon And Their Electro-catalytic Oxidation Of Pollutants In Wastewater

With the gradual acceleration of industrialization in China,water pollution is more and more serious,which brings many threats to human health and social sustainable development.Causing serious water pollution is mainly organic pollutants,and most of them are difficult to degrade.With the accumulation of time,the impact of organic pollutants become more and more serious.Thus,how to effectively remove the organic pollutants in water is a significant to water resources protection and Reasonable use.Electro-catalytic oxidation technology is one of the effective methods for the treatment of hard-degrading pollutants in water.Three-dimensional electrode electrochemical technology as a kind of electro-catalytic technologies,has high current efficiency,high treatment effects.It has been widespread concerned in the field of water treatment.In this thesis,the column-type activated carbon(AC)was used as the carrier to support the Sn-series composite oxide.The morphology and structure of the prepared particle electrode were characterized by SEM,EDS,XRD,XPS and BET.The electro-catalytic properties of different supported particle electrodes were investigated by treating the simulated wastewater.The results show that the particle electrode with Sn-Mn-Ce has the best loading,and the results of simulated wastewater treatment are the best,too.The effects of different supported particle electrodes,electrolyte concentration,loading voltage and initial pH on treating simulating wastewater were also investigated.The experiment results show that the prepared multi-component Sn-Mn-Ce/AC particle electrode has the best electrochemical degradation performance.The COD removal for phenol simulating wastewater is 76.0%when the tank voltage was 12.0V,the initial pH was 6.6,and the electrolyte concentration was 2.0g/L,And the p-NP removal for p-nitrophenol simulating wastewater is more than 95.0%when the tank voltage was 15.0V,the initial pH was 5.0,and the electrolyte concentration was 2.0g/L,respectively.The UV-vis scanning analysis explored the process of simulating wastewater degradation.The results show that with the help of multi-component catalytic activity,the open-loop reaction of phenol and p-nitrophenol is promoted and the degradation rate of organic matter is accelerated.Finally,the Sn-Mn-Ce/AC was used as the particle electrode for treating some industrial wastewater.When the three-dimensional electrode electrochemical treatment was used to pretreatment the coking wastewater,the COD decrease from 39800.Omg/L to 13862.5mg/L and the BOD5/COD increase from 0.092 to 0.237,the possibility of biological treatment of subsequent wastewater is improved.When the method was used as deep treatment to the nitrobenzene chemical wastewater.The last COD of the nitrobenzene chemical wastewater decrease to 39.1mg/L,the COD result also reachs the national level A standard.When the engine cleaning wastewater and electroplating wastewater were also treated by the three-dimensional electrode electrochemical method,the COD removal of both are more than 75%,and the treatment effect is obvious.Thus,the three-dimensional electrode electrochemical treatment can be used as a pretreatment to improve biodegradability or a deep degradation of biodegradable organic matters in the original wastewater treatment.