Study On Preparation And Performance Of Multipie Antimonide-Based Compound Photocatalysts

In this paper, multiple antimonide based compound photocatalysts were synthesized via microwave-hydrothermal and hydrothermal method. The relationship between the composition, structure and performance of the photocatalysts was investigated through a variety of characterization methods. The concrete contents were given as follow:With (CH3COO2)2Sr and Sb2O5 as raw materials, Sr2Sb207 and Sr1.36Sb2O6 photocatalysts were prepared by hydrothermal method. The optimum conditions of preparation determined by photocatalytic activity evaluation were with [OH"]=2 mol·L-at 150 ℃ for 24 h and with pH=5 at 100 ℃ for 24 h for Sr2Sb207 and Sri.36Sb206 respectively. After 30 min of UV-light irradiation, the degradation ratio of tetracycline hydrochloride was 99.7% for Sr2Sb2O7 photocatalyst that prepared under the optimal condition, while that for Sr1.36Sb2O6 photocatalyst was 80.7% after 180 min of UV-light irradiating. The main reason for the difference of photocatalytic performance between these two photocatalysts was the distortion degree of SbO6 octahedron. Dipole moment existed in distorted SbO6 octahedron could induce the local electric field, which helped to separate the photogenerated electron-hole, thus the photocatalytic performance was improved.With Sb2O3 and Bi(NO3)3·5H2O as raw materials, BiSbO4 were prepared by microwave-hydrothemal and hydrothemal methods. Then the optimum conditions of preparation determined by photocatalytic activity evaluation were with pH=5 at 220 ℃ for 90 min and with pH=1 at 250 ℃ for 24 h for BiSbO4 prepared by the microwave-hydrothemal method and hydrothemal method respectively. BiSbO4 show excellent photocatalytic activity under UV light. BiSbO4 photocatalyst prepared via a hydrothermal method showed higher photocatalytic activity than that prepared via microwave-hydrothermal method. The main reasons for the differences of photocatalytic performance between BiSbO4 photocatalysts prepared by different methods were the degree of crystallinity and lattice distortion. For BiSbO4 photocatalyst that prepared under the optimal condition via a hydrothermal method, after 90 min of UV-light irradiation, the degradation ratio of MO was 99.8%, after 60 min of UV-light irradiation, the degradation ratio of tetracycline hydrochloride could reached to 100%.Nanocrystalline Bio.76Sb1.24S3 photocatalyst was prepared via moicrowave-hydrothemal method, using thioacetamide as sulfur source, Bi(NO3)3·5H2O and Sb2O5 as metal precursors. Bio.76Sb1.24S3 was prepared with pH=5 at 200 ℃ for 60 min showed the highest photocatalytic activity, after 60 min of visible light irradiation, the degradation ratio of MO was 99.3%, after 150 min of visible light irradiation, the degradation ratio of 4-Phenylazophenol was 86.2%.