Nitrogen, sulfur and vanadium co-doped TiO2 photocatalysis with high visible light activities were synthesized through
sol-gel process. Uniform design, quadratic multinomial stepwise regression
analysis and programming solver were performed for co-doped TiO2 catalyst
preparation optimization. The N, S and V co-doping narrowed band gap energy of
TiO2 photocatalysis to the range of 2.65 to 2.93 eV. The photocatalytic
degradation rate of reactive blue by optimal co-doped TiO2 catalyst was 90.40%
in 3 h under visible light irradiation (λ ≥ 400 nm).
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