| This thesis focused on the preparation of rare earth La, Ce, Nd doping titanium-modified SnSb compound coating electrodes and investigation on its characteristics. Taking simulation of phenol wastewater as final aim, the optimization of degradation processes was examined.Taking COD removal rate of phenol wastewater and the oxygen-evolution potential as indiction, the main facter which influence electrode's performance, the temperature of thermal treatment, the heat treatment methods and rare earth content, were studied in detail. The optimal preparation technological parameter of three kinds of rare earth doping titanium-modified SnSb compound coating electrode as follow:①Thel heat oxidation temperature and the doping amount of La doping titanium-modified SnSb compound coating electrode were 550℃and 100:10:2.5(molar ratio), respectively.②The heat oxidation temperature, the heat treatment method and the doping amount of Ce doping titanium-modified SnSb compound coating electrode were 500℃and 100:10:2.5(molar ratio) and heat treatment method II, respectively.③The heat oxidation temperature and the doping amount of Nd doping titanium-modified SnSb compound coating electrode were 650℃and 100:10:1.5 and the second heat treatment method, respectively.The micrograph, crystal structure and the element composition of surface layers were analyzed with the help of SEM, EDX and XRD. The result indicated:①The electrode surface became more smooth, denser and the lattice and nanometer coating after rare earth doping.②Comparing with the blank electrode, the intensities of the diffraction peak were increaser and the peak shape was wider. This show that the formation of SnO2 crystals were complete and the number of SnO2 crystals were more and the SnO2 crystals were small.③The oxygen-evolution potential of the rare earth La, Ce, Nd doping titanium-modified SnSb compound coating electrodes were higher than that of the blank electrodes.The degeneration craft and the degeneration dynamics of stimulant phenol wastewater were studied. The result showed that when take rare earth Ce the doping titanium-modified SnSb compound coating electrode as an anode and the pure Ti board as a negative pole, the phenol initial density was 100mg/L, electrode interval was 1cm, electrolytic concentration of Na2SO4 was 0.25mol/L, the current density was 25mA/cm2 and the electrolysis time was 150min, the best degeneration result was obtained. The degeneration process of the simulation phenol wastewater followed the first-level dynamic equation. The total reaction kinetics equation was At=A0exp(-1.5t×10-2C-0.61D-0.22M0.77J1.30).
|
PDF Full Text Request