Fe掺杂Bi_(2)MoO_(6)的制备及其可见光催化活化PMS降解橙黄Ⅱ的研究  

Preparation and photocatalytic properties of Fe-doped Bi_(2)MoO_(6) catalyst for the degradation of OrangeⅡunder visible LED light

作　　者：钟欣 吴文霆 揭浩南 陈丹燕 唐望烨 阮韬 ZHONG Xin;WU Wen-ting;JIE Hao-nan;CHEN Dan-yan;TANG Wang-ye;RUAN Tao(Real State College,Beijing Normal University,Zhuhai 519000,Guangdong,China;College of Education for the Future,Beijing Normal Unisity at Zhuhai,Zhuhai 51900,Guangdong,China;Center for Territorial Spatial Planning and Real Estate Studies,Beijing Normal University at Zhuhai,Zhuhai 51900,Guangdong,China)

机构地区：[1]北京师范大学珠海分校不动产学院,广东珠海519000 [2]北京师范大学珠海校区未来教育学院,广东珠海519000 [3]北京师范大学珠海校区国土空间规划与不动产研究中心,广东珠海519000

出　　处：《安全与环境学报》2021年第5期2224-2232,共9页Journal of Safety and Environment

基　　金：广东省大学生创新创业项目(S202013177014);广东省普通高校青年创新人才基金项目(201912017QX);广东省普通高校特色创新项目(2020KTSCX177);北京师范大学珠海分校环境科学与工程专业虚拟仿真实验教学项目(201832);北京师范大学珠海分校教师科研促进计划项目(201850001);广东省“十三五”规划高校青年教师高等教育课题(19GYB060)。

摘　　要：采用一锅水热合成法制备Fe掺杂Bi_(2)MoO_(6)光催化剂,对Bi_(2)MoO_(6)的主体结构进行修饰和调整。在可见光LED照射下,利用合成的Fe-Bi_(2)MoO_(6)催化剂活化过一硫酸盐(PMS,peroxymonosulfate,oxone)对偶氮染料橙黄Ⅱ进行光催化降解。采用X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线能谱(XPS)和紫外-可见漫反射光谱(UV-Vis)对催化剂的形貌微观结构和化学价态进行表征,并应用在光催化活化PMS降解橙黄Ⅱ的过程中。结果表明,催化剂投加量为0.4 g/L,PMS投加量为0.4mmoL/L,初始pH值接近中性条件下,Fe-Bi_(2)MoO_(6)材料对橙黄Ⅱ的去除率可以达到100%。经过Fe掺杂后,Fe取代一部分的Bi3+,致使主体晶格出现畸变,不仅有利于光生电子和空穴的产生、分离和转移,还增强了Bi_(2)MoO_(6)的光催化活性。Fe-Bi_(2)MoO_(6)光催化剂经重复使用5次后对橙黄Ⅱ的降解率仍然可以达到89.1%以上,具有优秀的光催化稳定性能。活性自由基的出现在光催化降解过程中起到主要作用,由此展示出一种潜在的光催化降解机制,且Fe掺杂Bi_(2)MoO_(6)比单纯Bi_(2)MoO_(6)具有更好的光催化降解稳定性。A series of Fe-Bi_(2)MoO_(6) materials were successfully prepared through a one-step hydro-thermal method by employed iron elements into the structure of Bi_(2)MoO_(6) lattice,to modify and adjust the surface structure of hoist Bi_(2)MoO_(6).The series of catalysts were applied in the activation of peroxymonosulfate(PMS,oxone)for the degradation of OrangeⅡunder visible LED light irradiation.The catalysts were fully characterized by different technologies,such as X-Ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-Ray photoelectron spectroscopy(XPS),and UV-Vis spectrophotometer methods.The sulfate radical-based photocatalytic degradation of OrangeⅡunder visible LED light irradiation was carefully investigated under various experimental conditions,including catalyst dosage,PMS concentration,initial pH,and different iron loading.The results reveal that the degradation efficiency of OrangeⅡis 100%when the catalyst dosage is 0.4 g/L and the PMS concentration is 0.4 mmol/L under natural pH.The results show that the catalytic performance of irondoped Bi_(2)MoO_(6) is better than that of pure Bi_(2)MoO_(6) material.By the introduction of the iron element into the structure of Bi_(2)MoO_(6) material,iron could be a substitution for Bi3+in the crystal lattice of Bi_(2)MoO_(6),leading to the formation of the oxygen defects in the structure.The oxygen defects could act as the reactive sites in the photocatalytic reaction,facilitating the formation of photogenerated holes and electrons which showed higher catalytic activity than that of pure Bi_(2)MoO_(6) material.Moreover,the photocatalytic degradation efficiency of OrangeⅡcould still reach higher than 89.1%after Fe-Bi_(2)MoO_(6) was recycled five times.Sulfate radicals and hydroxyl radicals were found to be the reactive species generated in the sulfate-radicals-based photocatalytic process.Based on the above results,the possible degradation mechanism of OrangeⅡwas discussed in the sulfate-radicalsbased photocatalytic pr

关 键 词：环境工程学 Fe-Bi_(2)MoO_(6) 光催化剂 可见光 橙黄Ⅱ 

分 类 号：X703.1[环境科学与工程—环境工程]