Studies On Photo-electro-chemical Catalytic Decolorizing Degradation Of Dye Wastewater

Photocatalytically active thin TiO₂ films were produced by thermal oxidation of titanium metal. The best conditions which was Heating rate 15℃/min;The final temperature 600℃;hold time 2 hours,was come to by Orthogonal test.Data show that effect of thin TiO₂ films was Impacted by Heating rate,the final temperature and hold time.in the same time,the final temperature has the greatest impact.The hold time has the minimal impact.in addition,thin TiO₂ films was Characterizated by XRD,SEM and AFM methods.Photoelecreocatalytic degradation of methyl red in the single compartment and double compartment photoreactor was studied comparatively.In this comparative experimentation,TiO₂ thin film electrodes were prepared as the anode and High purity graphite as the cathode.The effect of initial pH and Ultraviolet brightnesson and preaerationthe and different target on the degradative efficiency of the single compartment and double compartment photoreactor were investigated.The experimental results indicated that degradative efficiency of methyl red in double compartment is about 15%Higher than single compartment photoreactor,the initial pH of solution both Have a significant effect on the degradative efficiency of the single compartment and double compartment photoreactor.The best initial pH is 3.At the same time,cumulative quantity of peroxide in double compartment is also 43.3%higher than single compartment,invalid consumption of peroxide in the anode of single compartment is an important reason thatUsing Ion-exchange membrane substitute Agar salt bridge to improve Original photoelectrocatalytic reactor.The efficiercy of reactor was increased because H⁺ produced in its anode can enter cathode through Ion-exchange membrane.The diversification of pH in reator was detected in experiment and compare with Salt bridge reactor.At the same time,the efficiercy of methyl red in three type of reactors in the tsame conditions.was compared.The effect of initial pH and cathode potential and experimental conditions on the degradative efficiency of the Cation-exchange membranes reactor were investigated.The experimental results indicated that the magnitude of changes of pH in Cation-exchange membrane reactor was significantly less than Salt bridge reactor because of the H⁺ transportation of Cation-exchange membrane to cathode,and the efficiercy of Cation-exchange membrane reactor was higher than the other two reactors.Aiming Cation-exchange membrane reactor,the efficiercy in Photoelectrocatalytic conditions was higher than photocatalytic or electrocatalysis conditions.In addition,the best condition of degradating methyl red was pH=3 and Ec=-0.6V in Cation-exchange membrane reactor.