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The Er_2O_3/TiO_2 complex photocatalyst was prepared with tetra-n-butyl titanate [Ti(OC_4H_9)_4] and Er_2O_3 by sol-gel method in alcohol -HNO_3 liquor and characterized by XRD. The influential factors on photocatalytic activity of Er_2O_3/TiO_2, such as the content of Er_2O_3, the calcined time and temperature etc. were discussed. The pH value, concentration of acid red B and reaction time were studied for photocatalytic degradation of acid red B. The results show that Er_2O_3/TiO_2 annealed at 450 ℃ for about 3 h has the highest photocatalytic activity and the degradation rate of acid red B with 10～20 mg·dm -3 to 96% under 30 W 365 nm irradiation for 3 h light. The photocatalytic degradation of acid red B with Er_2O_3/TiO_2 is the first order reaction.
The Er_2O_3 / TiO_2 complex photocatalyst was prepared with tetra-n-butyl titanate [Ti (OC_4H_9) _4] and Er_2O_3 by sol- gel method in alcohol-HNO_3 liquor and characterized by XRD. The influential factors on photocatalytic activity of Er_2O_3 / TiO_2, such as the content of Er 2 O 3, the calcined time and temperature etc. were discussed. The pH value, concentration of acid red B and reaction time were studied for photocatalytic degradation of acid red B. The results show that Er 2 O 3 / TiO 2 annealed at 450 ° C. for about 3 h has the highest photocatalytic activity and the degradation rate of acid red B with 10 ~ 20 mg · dm -3 to 96% under 30 W 365 nm irradiation for 3 h light. The photocatalytic degradation of acid red B with Er 2 O 3 / TiO_2 is the first order reaction.