纳米TiO_2催化染料活性艳红X-3B光降解

Studies on the Photocatalytic Degradation of Reactive Brilliant Red X-3B in Water by Nanometer Titanium Dioxide

研究了纳米级二氧化钛对活性艳红X-3B的多相光催化降解行为。对影响活性艳红X-3B溶液的光催化降解的各种条件(如溶液的pH值、光强、催化剂用量以及溶液的初始浓度等)进行了考察。结果表明,X-3B溶液在强酸性和强碱性介质中降解速度更快,降解率随着紫外光强度的增强而加快,随着X-3B初始浓度的增大而减慢;催化剂的最佳用量在1.5g/L左右,H2O2的使用量也有一个最佳浓度,约在20mmol左右,高于该值X-3B的去除率反而降低,而不是以前文献所报道的使用量越多效果越好。以上各种条件下X-3B的光催化降解均符合一级反应动力学方程。

The photocatalytic degradation behavior of aqueous reactive brilliant red X-3B by nanometer TiO2 was studied. The operating parameters, i.e. pH of the solution, photocatalyst content, and initial dye concentration on the photocatalytic process were examined. The experimental results showed that the degradation rate of X-3B was more quickly in strong acid and basic media, and the reaction rate was increased with increasing UV light intensity and decreased with increasing the initial X-3B concentration. The optimum dosage of catalyst TiO2 was about 1.5g/L. The dosage of oxidant H2O2 had also an optimum concentration with the value about 20mmol/L, the degradation rate of X-3B would decrease when H2O2 concentration over 20mmol/L. Kinetics analysis indicated that the degradation of X-3B could be approximated as first-order kinetics.