光催化降解活性染料K-GL的动力学及其盐效应

以分散态纳米TiO2为光催化剂，在鼓泡流化床光催化反应器中对活性翠兰K-GL染料溶液进行光催化降解实验研究。通过改变光催化剂投入量、染料溶液的初始浓度和Na2SO4与NaCl的掺加，探讨了影响光催化降解K-GL的因素，运用Langrmuir-Hinshelwood动力学方程对染料降解动力学规律进行了研究。结果表明，TiO2光催化降解活性翠兰K-GL的反应遵循准一级反应动力学方程，且表观反应速率表常数随活性翠兰溶液初始浓度的升高而降低；反应的催化剂最佳投入量为0.122g/L；光催化体系中的Na2SO4对于染料K-GL的降解表现出明显的促进作用，在较低浓度下，Na2SO4的最佳添加量为0.104mol/g，且随着其浓度的升高，表观反应速率常数随之增大；而掺加不同浓度的NaCl对光催化降解K-GL有抑止作用。

Investigation into salt effect and kinetics of photocatalytic degradation of reactive dye K-GL

Nanometer TiO2 dispersed in water was used as photocatalyst in a self-designed bubbling fluidized bed photocatalytic reactor （BFBPR）. Photocatalytic degradation kinetics of reactive turquoise blue K-GL in BFBPR was investigated by considering the dosage of photocatalyst，initial dye concentration，ionic strength of NaCl and Na2SO4. Furthermore，the Langrmuir-Hinshelwood kinetics equation was used to describe the photocatalytic degradation kinetics of dye K-GL. The photocatalytic degradation of reactive turquoise blue K-GL reaction followed a pseudo-first order kinetics equation，and the apparent reaction rate coefficient decreased with increasing initial dye concentration. The optimal catalyst amount was 0.122g/L. Addition of Na2SO4 promoted photocatalysis of K-GL at lower dye concentrations with the optimal addition of 0.104mol/g. In addition，the apparent reaction rate coefficient increased with increasing addition of Na2SO4，while the photocatalysis was inhibited with increasing addition of NaCl.