Preparation Of Electrocatalytic Electrode And Its Application On The Treatment Of Refractory Organic Wastewater

In the electrochemical method for water treatment, the study and exploitation of new electrode materials has become a very hot subject. Especially, the anode materials related with electrocatalytic characters are being put more attention than else. This paper focused on the preparation and characters of Ti/Sb-SnO₂ electrode doped with Nd, La or Y. Then the relationship between the electrocatalytic ability and the electrodes structure was investigated.Taking decolorization rate of Reactive Brilliant Red X-3B and electrode stability as indiction, the main factors which influence electrode's performance, heat oxidation temperature and rare earths (REs) content, were studied in detail and the optimal preparation conditions were obtained: â‘  the heat oxidation temperature for Ti/Sb-SnO₂ doped with Nd was 550°C, the doping content of Nd was Sn:Nd= 100:1.0. â‘¡the heat oxidation temperature for Ti/Sb-SnO₂ doped with La was 450°C, the doping content of La was Sn:La= 100:0.7. â‘¢the heat oxidation temperature for Ti/Sb-SnO₂ doped with Y was 500℃, the doping content of Y was Sn:Y= 100:0.8.The crystal structure, the micrographs, element analyses, the chemical environment of elements on the electrodes surface and the deoxidation potential of the electrodes were analyzed with the help of XRD, SEM, EDX, XPS, potentio-dynamic polarization measurement. Results illustrated that â‘ Compared to Ti/Sb-SnO₂ electrode, the appearanaces of Ti/Sb-SnO₂ electrode doped with Nd, La or Y were changed obviously. The roughness is smaller, the gaps are narrower and the crystal particles are less.â‘¡The content of Nd, La or Y in electrode is more than the content in the dipping liquid for Res has the tendency of enrichment to electrode surface. â‘¢There are no characteristic peaks in the XRD, the Coats are equal and well coverd. Compared to Ti/Sb-SnO₂ electrode, the characteristic peaks of SnO₂ crystality are weaker but wider after doped. â‘£The binding energy of Nd, La, Y strongest peaks are 980.70eV, 836.42eV, 156.42eV relatively. According to XPS handbook, Nd, La, Y are being as Nd³⁺ , La³⁺ ,Y³⁺composite oxides. ⑤The deoxidation potentials of Ti/Sb-SnO₂ electrode doped with Nd, La, Y are 2.24 V, 2.10 V, 2.06 V, higher than The deoxidation potentials of Ti/Sb-SnO₂ electrode, 1.53V.â‘¥The life of Ti/Sb-SnO₂ electrode doped with Nd, La, Y is longer.The influence factors, degradation kinetics were studied in the paper. The results showed that current density, electrolyte concentration, electrode distance and whisk style influence the removal effections. The degradation of Reactive Brilliant Red X-3B keep to the first kinetics equation, the total reaction kinetics equation is...