摘要
采用化学共沉淀法制备了镧掺杂铁酸铋纳米粒子(Bi1-xLaxFeO3,x=0~0.40),研究了掺杂浓度对产物的物相结构、形貌、光学吸收性质、吸附和光催化性能的影响.结果表明:随着掺杂浓度的增加,Bi1-xLaxFeO3的晶体结构由六方晶系转变为正交晶系,催化剂的粒径逐渐减小,吸收带边缓慢红移;在可见光下,Bi1-xLaxFeO3光催化降解罗丹明B(RhB)的性能优于纯BiFeO3,Bi0.65La0.35FeO3的光催化活性最佳,在重复使用5次时,RhB的降解率仍高于85%;抑菌圈实验显示,Bi0.65La0.35FeO3在可见光下对大肠杆菌具有抑菌活性;借助捕获实验证实了光催化过程中的主要活性氧物种是·OH,·O2^-和h^+.综上,Bi0.65La0.35FeO3有望应用于光催化降解有机染料废水和光催化抑菌中.
La-doped bismuth ferrite nanoparticles ( Bi 1- x La x FeO 3 , x =0~0.40) were prepared by chemical co-precipitation method, and effects of the dopant concentration on the phase structure, morphology, optical absorption, adsorption and photocatalytic performance of the obtained products were investigated. The results showed that with the increase of the La doping concentration, the rhombohedral to orthorhombic phase transformation in bismuth ferrite occurred, the size of the catalysts decreased and the absorption edge had a slowly red shift. Compared with BiFeO 3 , Bi 1- x La x FeO 3 showed an improved photocatalytic performance for degradation of Rhodamine B (RhB) under visible light irradiation. Bi 0.65 La 0.35 FeO 3 had the best photocatalytic activity and the degradation rate of RhB was higher than 85% as the catalyst was used at the fifth cycle. Moreover, Bi 0.65 La 0.35 FeO 3 exhibited an antibacterial activity against E. coli as exposed to visible light. A scavenger experiment revealed the major reactive species in the photocatalytic process were ·OH,·O2^- and h^+. In summary, Bi 0.65 La 0.35 FeO 3 might be a promising material for photocatalytic degradation of organic dye in waste water and bacterial inhibition.
作者
梁天华
赵巧云
胡静慧
方悦
赵玉玲
吕天喜
宫培军
LIANG Tianhua;ZHAO Qiaoyun;HU Jinghui;FANG Yue;ZHAO Yuling;L Tianxi;GONG Peijun(Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China;Preschool Teacher Education College of Lishui University, Lishui 323400, China)
出处
《浙江师范大学学报（自然科学版）》
CAS
2019年第3期294-301,共8页
Journal of Zhejiang Normal University:Natural Sciences
基金
浙江省公益技术应用研究计划项目(2016C31014)
浙江师范大学“先进催化材料”教育部重点实验室和“固体表面反应化学”浙江省重点实验室开放课题基金
国家级大学生创新创业训练计划(201810345040)
关键词
铁酸铋
掺杂
化学共沉淀
光催化
抑菌活性
bismuth ferrite
doping
chemical co-precipitation
photocatalysis
antibacterial activity
