Abstract:

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.

Key words: sol-gel method, textile printing and dyeing wastewater, Ce-TiO₂-RGO, photocatalysis, spectral performance