{001}TiO_(2)的除氨抗菌性能研究

Preparation of{001}TiO_(2) and its ammonia removal and antimicrobial properties

采用溶胶-凝胶法在低温条件下制备出{001}TiO_(2)光催化剂,分别以大肠杆菌和氨气为目标污染物,考察所制备催化剂的抗菌除氨性能,为其在养殖应用上提供一定的理论依据。结果表明:所制备催化剂是由5 nm左右的小颗粒堆积而成,含有40.1%的高活性{001}面,这种{001}面与催化剂自身的{101}面形成异质结构,加速了光生载流子分离,展现出优异的催化性能。{001}TiO_(2)在太阳光和紫外光下对氨气降解率分别为32.7%、61.3%,分别是TiO_(2)的3.08倍、2.21倍,在日光灯下{001}TiO_(2)对大肠杆菌的抑菌圈为32.1 mm,远高于TiO_(2)。

The{001}TiO_(2)photocatalyst was prepared by sol-gel method at low temperature.The antibacterial and ammonia removal properties of the prepared catalyst were investigated by taking Escherichia coli and ammonia as the target pollutants respectively,providing a theoretical basis for its application.The results showed that the catalyst was made up of small particles at about 5nm and contained 40.1%highly active{001}surface which formed a heterostructure with the{101}surface of the catalyst itself,accelerated the separation of photocarriers and showed excellent catalytic performance.The degradation rates of{001}TiO_(2)to ammonia under sunlight and ultraviolet light were 32.7 and 61.3%,respectively,which were 3.08 and 2.21 times of TiO_(2).The inhibition zone of{001}TiO_(2)to Escherichia coli under fluorescent light was 32.1mm,much higher than that of TiO_(2).