Preparation of Ce-TiO2-RGO catalyst and its application in the treatment of printing and dyeing wastewater
Ce-TiO2-RGO composite photocatalyst was prepared by sol-gel method and ultrasonic treatment.The effect of Ce doping mass fraction on the degradation of textile printing and dyeing wastewater was studied.The catalysts were characterized by XRD,SEM,TEM,UV-vis and PL.The results showed that,Ce-TiO2 particles uniformly adsorbed on the GO surface,and the particle diameter of Ce-TiO2 was approximately 25-110 nm.After Ce doping,the absorption band edge of TiO2-RGO composite photocatalyst was redshifted and the band gap was reduced.With the increase of Ce doping mass fraction,the PL intensity of Ce-TiO2-RGO composite photocatalyst first decreased and then slightly increased,and the emission peak intensity of 6％Ce-TiO2-RGO composite photocatalyst was the lowest at 410 nm and 470 nm.Taking textile printing and dyeing wastewater as the research object of degradation,the COD removal rate of 6％Ce-TiO2-RGO reached the maximum of 82.21％at 180 min,and the COD value after degradation was 88.95 mg/L which was in line with the wastewater discharge standard.On the other hand,at 180 min,the degradation rate for textile printing and dyeing wastewater by 6％Ce-TiO2-RGO also reached the maximum(99.21％).Therefore,the Ce-TiO2-RGO composite photocatalyst showed great application potential in the treatment of textile dyeing wastewater.
sol-gel methodtextile printing and dyeing wastewaterCe-TiO2-RGOphotocatalysisspectral performance
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