关键词:

TiO₂纳米管, 腐殖酸, 光催化, 臭氧化, 动力学

Abstract:

Titanium dioxide nanotubes (TNTs) were prepared and used as catalysts for degradation of humic acid by titanium dioxide nanotubes/UV/O₃.With a view of kinetics, the effect of calcination temperature and the synergistic effect of photocatalysis and ozonation were analyzed.The influences of reaction temperature, original pH value, dosage of TNTs and dosage of ozone on the reaction kinetics were also investigated, and the reaction kinetics model was established.The result showed that photocatalysis and ozonation had a good synergistic effect and the best reaction temperature of TNTs was 400℃.The TOC removal of humic acid followed zero-order kinetics.In the model, the best reaction kinetics k was obtained under the condition with original pH value of 7.35, TNTs dosage of 0.806 g·L^-1 and ozone dosage of 0.49 g·h^-1.It was 0.8095 mg·L^-1·min^-1 when the reaction temperature was 25℃ while 0.8231 mg·L^-1·min^-1 at 30℃.The theoretical predictions were in good agreement with the experimental data.

Key words:

TiO₂纳米管, 腐殖酸, 光催化, 臭氧化, 动力学