氟铌酸银光催化剂的制备与表征及抗菌性能研究

Synthesis,Characterization and Antibacterial Activity of Silver Fluoroniobate Photocatalyst

采用固相反应法制备可见光催化剂AgNb_(2)O_(5)F,利用XRD测试物相组成,使用SEM和EDS分别对样品的形貌和元素组分进行了分析。AgNb_(2)O_(5)F半导体的能带宽度为2.68eV,对可见光具有较好的吸收能力。研究表明,在可见光的照射下,在120 min内,AgNb_(2)O_(5)F对罗丹明B的光降解率可达90%,反应动力学常数为0.021 min^(-1);AgNb_(2)O_(5)F对革兰氏阴性大肠杆菌和金黄色葡萄球菌的抗菌率分别可达96.0%和94.8%;无光照的情况下,AgNb_(2)O_(5)F对于革兰氏阴性大肠杆菌和金黄色葡萄球菌均具有一定的抗菌效果,抗菌率分别可达60.4%和78.2%。

AgNb_(2)O_(5)F visible light photocatalyst powder was synthesized by using the conventional solid-state reaction method.Phase composition of the samples was analyzed with XRD,while morphology and elemental composition were examined by using SEM and EDS.AgNb_(2)O_(5)F has a bandgap of 2.68 eV,thus having strong visible light absorption.With the irradiation of visible light,the AgNb_(2)O_(5)F photocatalyst exhibited Rhodamine B degradation rate of 90%in 120 min,corresponding to a kinetic constant of 0.021 min^(-1),while the antibacterial rates of AgNb_(2)O_(5)F against Gram negative Escherichia coli and Staphylococcus aureus were 96.0%and 94.8%,respectively.Meanwhile,without light irradiation,the AgNb_(2)O_(5)F still demonstrated certain antibacterial activities to Escherichia coli and Staphylococcus aureus,with antibacterial rates to be 60.4%and 78.2%,respectively.