The Study On Catalytic Performance Of Titanium Matrix Composite Oxide Electrode Materials

Dimensionally stable anode is popular with demestic and international worksbecause of good catalytic activity . DSA was used to degrate waste water for mangyeaars . But it has been unable to widely used because that the efficiency is not highyand the economy is not worhwhile.The difficulties in treating waste water mainly liesin the two“time”problems: one is the time of treating waste water, namely how toimprove the efficiency of the anode; another one is the lifespan of anode ,namely howto improve the stability of the anode.Electrode material is the key factors for the“time”problems.In this thesis, we aim at adding fluorine element to active layer by sol-gelmethod and improving the electrochemical catalytic activity and service life ofcomposite electrode. At the same time , we investigate different mono-valence cationsof different fluoride would influence the electrochemical catalytic activity and servicelife of composite electrode. In addition, this paper also studied the ability of titaniummatrix composite oxide electrode degrading phenolic resin plant wastewater.The experimental contents are as follows:（1） This article investigates F-Sb co-doped SnO₂films as an anode material ontitanium（Ti） substrate by Sol-gel method with different mono-valence fluoride （LiF,NaF, KF, NH₄F ）. X-ray diffraction （XRD） and scanning electron microscope （SEM）are used to study structures and composition of the anode surface and that fluoridedoping do not change the SnO₂’ rutile structure. Through the cyclic voltammetrymeasurements and Tafel’curve electrochemical test, Ti/SnO₂-Sb-F compositeelectrode doping with KF has higher anode oxygen evolution potential and theexchange current density than other anodes .（2） Investigating F-Sb co-doped SnO₂films as an anode material on titanium（Ti）substrate for degradation of methyl orange has been conducted. Change of spectrumof methyl orange solution as time shows that Ti/SnO₂-Sb-F composite electrode coulddegrade methyl orange, among them and the catalytic performances of Ti/SnO₂-Sb-Fcomposite electrode doped NH₄F or KF were better than other Ti/SnO₂-Sb-F composite electrode.（3） By orthogonal experiment, 93% degradation rate of methyl orange solutionhas been obtained by optimizing the preparation conditions of Ti/SnO₂-Sb-Fcomposite electrode coping with KF and electrolytic conditions: with 9 coatings, 773K of calcining temperature, Sn:Sb:F （molar ratio） =9:1:0.5.The electrolyte solutionwas given of containing 50mg/L methyl orange, 110mg/L Fe（III） additive at pH=1.0and for 75 min of electrolyting time.X-ray diffraction （XRD） and X -rayphotoelectron spectroscopy （XPS） are used to study structures and composition of theanode surface. It show that the host of the composite materials of SnO₂is rutilestructure. Sb, F, K was succeed into SnO₂lattice.（4） This paper also use composite electrode to treat phenolic resin factory wastewater. and electrolytic conditions:Voltage=10V, pH=7.0, C_Na2SO4=150mg L.