Preparation of N-TiO2 photocatalyst and its degradation of organic pollutants under blue LED light.

Nitrogen-doped titanium dioxide (N-TiO₂) photocatalyst was synthesized by mechanochemical, hydrolysis precipitation and sol-gel method respectively. With the application of Methylene blue (MB) and tetraccycline hydrochloride (TTC) as the target pollutants, N-TiO₂-H synthesized by hydrolysis precipitation method has high photocatalysis activity under blue LED irradiation, uniform particle distribution and no agglomeration. Therefore, N-TiO₂-H was selected to study the effects of calcination temperature, catalyst dosage, pH and initial concentration of organic pollutants by photocatalysis. The results showed that N-TiO₂-H calcined at 400 X. had the best photocatalytic activity under blue LED light irradiation. Under the dosage of 0.5 g/L N-TiO₂-H, the photocatalytic degradation of MB with initial concentration of 5 mg/L, pH=7, MB removal was 89.7% after 2 h, and the photocatalytic degradation of TTC with initial concentration of 50 mg/L, pH=5, TTC removal was 75.2% after 1.5 h. [ABSTRACT FROM AUTHOR]