无机盐对TiO_2催化降解活性染料的影响

Influences of inorganic salt on photocatalytic degradation of reactive dyes with TiO_2

制备了可见光响应型纳米TiO2光催化剂,研究在无机盐存在下,TiO2对均三嗪型活性染料的光催化降解机制。结果表明,氯化钠对TiO2光催化降解活性染料既有促进作用又有抑制作用,其取决于氯化钠的浓度;硫酸钠对TiO2的光催化性能只有抑制作用,且随硫酸钠浓度的增大而增加;无机盐对X型活性染料活性艳蓝X-BR的光催化脱色没有影响,但适量的无机盐能促进K型活性艳蓝K-GR的降解。不同pH值条件下,无机盐对活性染料光催化脱色的影响不同,在酸性条件下无影响,中性和碱性条件下影响较明显,脱色率由大到小依次为:酸性>碱性>中性。

Visible light activated TiO2 photocatalyst is synthesized, and photocatalytic degradation of triazine reactive dyes with prepared TiO2 under the presence of inorganic salts is investigated. The results show that NaCI has both positive and negative effect on photocatalytic degradation of the reactive dyes, which is dependent on NaCI concentration. NazSO4 has only negative effect on photocatalytic degradation of the reactive dyes, and the effect is enhanced with the increase of Na2SO＂ cencentra tion. Inorganic salts have no effect on photocatalytic decolorization of X-type Reactive Brilliant Blue X-BR, whereas small a- mount of inorganic salts can enhance the photocatalytic degradation of K-type Reactive Brilliant Blue K-GR. Influence of inorganic salts on photocatalytic decolorization of reactive dyes differs with different pH values, none effect in acidic solution and obvious effect in neutral and alkaline solution with ranking of color removal acidic 〉 alkaline 〉 neutral.