Preparation Of Titanium-based Metal Oxide Anodes And Their Research On The Treatment Of Organic Wastewater

As the most rare strategy resource,water resource has become a serious problem waiting to be solved in 21 st century.With the rapid industrial development and people's daily life,water pollutant condition goes from bad to worse.Freshwater resources which can be used by human beings are very few and it almost belongs to nonrenewable resources.Industrial areas like steel,petroleum,printing and dying,textile and so on are all bringing us wastewater all the time.According to C hina's wastewater discharge standard in various industries,the complex composition and content fluctuation of the wastewater have brought great challenges to the water treatment process,so many new technologies and new methods of water treatment have emerged.At present,more and more attention has been paid to DSA anod ic electrochemical oxidation methods.However,due to the limitation of their stability and electrocatalytic oxidation performance,DSA anodes have some disadvantages such as short life,low catalytic activity,and low efficiency.Therefore,the purpose of our research is to find a long life electrode with good catalytic performance.In this thesis,the manganese and cerium oxides were used to modify the tin-antimony anode.The main results are as follows:?1?The MnO₂ was doped into the tin-antimony oxide coating by pulse electrodeposition to affect the crystallization of tin.The physical properties of the as-prepared electrodes were characterized by SEM and XRD.The results show that the surface of the modified electrode is covered with a uniform coating,and the formation of tin and manganese oxides as well as the close combination greatly improve the anti-corrosion ability of the electrode.In electrical performance,the oxygen evolution potential of the as-prepared electrode was 2.30 V and the electrode life under accelerated test conditions was about 41 h.When the as-prepared electrode was used for the degradation of phenol containing wastewater,the removal rate of COD could reach more than 80% after 6 h,which indicated that the electrode's performance was greatly improved.?2?The cerium oxide was doped to improve the porous structure of electrode,increase the active area and the catalytic activity of the electrode.The physical properties of the as-prepared electrodes were characterized by SEM and XRD.It was found that the surface of the as-prepared electrode which is much different from that of the MnO₂ doped electrode has very fine crystal particles and no obvious cracks.Also,the bonding between electrode and coating is firm.The electrical performance test showed that the oxygen evolution potential of the as-prepared electrode was 2.48 V and the electrode life under accelerated test conditions was about 39 h.When the as-prepared electrode was used for the degradation of phenol containing wastewater,the removal rate of COD could reach more than 50% after 2 h,which indicated that the electrode's performance was greatly improved.?3?When the as-prepared electrode was used in the actual degradation process,the hydroxyl radical masking experiment proved that the catalytic oxidation process of electrode follow the oxidation mechanism of free radicals.The optimal operating conditions of the as-prepared electrode were achieved by identifying various influencing factors.The test of amplified electrode proved that the as-prepared electrode is efficient for the degradation of organic compounds.