Study on the photocatalytic degradation of ammonia nitrogen in aquaculture wastewater by Sn4+-doped nano-TiO_2 under UV irradiation

摘要

The Sn~(4+)-doped nano-TiO_2 particles with various amounts of dopant Sn~(4+) irons was prepared by sol-gel method using tetrabutyl titanate(TEOT) as one of the primary raw materials at different calcination temperatures (400-700?C). The products were characterized by XRD and SEM, which revealed that the crystal structure of Sn~(4+)-doped nano-TiO_2 changes from anatase to rutile with the calcination temperature increasing, and the nanoparticles diameter was around 10-30 nm. The photocatalytic degradation of ammonia nitrogen in aquaculture wastewater was investigated by using Sn~(4+)-doped nano-TiO_2 under UV irradiation. The experimental results can be stated as follows: when the ratio of dopant Sn~(4+) was 3% wt, the calcination temperature of Sn~(4+)-doped nano-TiO_2 was 500 ?C, the dosage of Sn~(4+)-doped nano-TiO_2 was 0.8 g/L, respectively, if the reaction time may last 4h, the removal rate of ammonia-N was expected to reach 87.13%.