Preparation And Electro-catalytic Performance Studies Of Ti/SnO₂-Sb₂O₅Electrodes By Sol-gel Method

Having paid more and more attention on the environmental pollutions especially waterpollution for recent years, people, organizations and governments all over the world havestrengthened the management of water pollution in the environment. Among plenty of watertreatment technologies, the electro-catalytic process has aroused wide attention and hadgreat numbers of promising applications.Sol-gel method was applied for preparing Ti/SnO₂-Sb₂O₅electrodes throughdip-coating. The effects of different experimental conditions on the properties of theTi/SnO₂-Sb₂O₅electrodes, which mainly included structure, morphology, stabilityand electro-catalytic performance, were investigated with some characterizingmethods such as XRD, SEM, EDS, electrochemical measurements, phenoldecomposition test, accelerated life test and so on. It was determined that theoptimum is Sb doping percentage11%, relative viscosity1.47in the sol, coating number30, sintering temperature600℃and calcining time2h, and that the electrode acceleratedservice life reaches up to20h, and100mL100mg/L phenol solution is decomposedcompletely after3.5h processing.Based on the optimal process for the preparation of Ti/SnO₂-Sb₂O₅electrodes, dopantmodifications were investigated to further improve the stability and catalytic performance ofelectrodes. Analyzing rare earth elements La and Ce doping effects, it was found that theoptimum efficiency is accelerated service life35h and phenol degradation time3h when Ladopant per centum is3%; the performance of electrodes is the best with Ce dopant percentum2%, and the accelerated service life is39h. However, doping Ce restrains phenoldegradation efficiency. Studying transition metal elements Mn and Ni dopants indicated thatthe optimum condition of Mn dopant ratio is4%with the accelerated service life29.6h andphenol degradation time2.5h, and that the first-rank condition of Ni dopant ratio is4%withaccelerated service life60.3h and degradation time2h.Summarizing the above preparation procedures, the stability and electrochemicalcatalysis of Ti/SnO₂-Sb₂O₅electrodes were the best with dopant ratio4%of Ni level.