Reaserch On The Electrode Process Of Degradation Phenol On Re/SnO₂ Electrode By Electrochemical Methode

It is diffult to degrade the organic pollutant because of lacking effective methods. This problem is a difficuty in water treatment domain and it is effecting the environment that human live in. Human regard the technology of electrochemical oxidation as one of the most important technologies more and more, because of its excellent degeneration capability to organic pollutant.But the reaserch on the reaction mechanism of pollutant degeneration is not enough.It limits the electrocatalysis oxidation technology development. In this paper, experimental study of the influences of rare earth doping on the characteristics of SnO2 catalytic electrodes was carried out . The reaction mechanism of phenol degeneration has been analysised with the method of cyclic voltammetry,polarization curve,situ AC impedance measurements. The main research content is as follows:This experiment used the electrochemical means to reaserch the different rare earth doping on SnO2 electrode.The result showed the rare earth doping content had a best value: Dy:Sn, 1:200,Nd:Sn, 1:200,Eu:Sn, 1:50,Gd:Sn, 1:50. Reaserch had confirmed beforehand research conclusion of the laboratory by the electrochemical angle. The rare earth doping on SnO2 electrode was studied with the methodes of cyclic voltammetry,the polarization curve method and situ AC impedance measurements. Meanwhile the electrocatalysis performance of electrode tested by the methode of electrochemistry accord to the capability to degrade phenol of electrode: Nd-SnO2 electrode〉Dy-SnO2 electrode〉Gd-SnO2 electrode〉Eu-SnO2 electrode〉SnO2 electrode.The results of cyclic voltammetry and Tafel showed phenol degeneration on rare earch doping on SnO2 electrode were controlled by proliferation, D0=1.07×10-4cm2/s, and reaction on the surface of electrode was irreversible. The reaction accorded to the first level dynamic equation, k=0.0212s-1. The result showed·OH was important in phenol degeneration and analysis the reaction mechanism of phenol degeneration. Firstly phenol adsorbed on electrode surface, then turned to hydroquinone and catechol, hydroquinone and catechol were oxidated to benzoquinones, and benzoquinones was oxidated to simple orgnic...