Research on photocatalytic activity of the titanium dioxide doped with transition metal ions in dyestuff wastewater

The titanium dioxide(TiO₂) doped with Fe³⁺ or Cu²⁺ was prepared by sol-gel method. Their photocatalytic activities for photodegradation of mordant blue wastewater were investigated under the natural light irradiation condition. The results showed that photocatalytic activity of TiO₂ doped with Fe³⁺ or Cu²⁺ was better than pure TiO₂, and the TiO₂ doped with Fe³⁺ was the best. The efficiency of photocatalytic degradation reached the optimum value when doping ratio of Fe³⁺ was 0.1% and its dosage was 0.5g/L, the degradation rate reached 93.5%. When doping ratio of Cu²⁺ was 3% and its dosage was 0.6g/L, the degradation rate reached 83.6%.