改进溶液燃烧法制备Fe3+掺杂Bi24O31Cl10及其光催化性能的研究

采用改进溶液燃烧法,以硝酸铋、柠檬酸、氯化铵和硝酸铁为原材料制备Fe-Bi24O31Cl10光催化物质,并通过在可见光下降解RhB评价Fe^3+掺杂对其光催化性能的影响。采用XRD,XPS,UV-vis,SEM,HTEM,FT-IR等表征手段研究了不同Fe^3+掺杂量对Bi24O31Cl10的物相、元素价态、光吸收性能、微观形貌以及颗粒分布、晶面间距、化学结构组成等的影响。结果表明:掺杂Fe^3+未改变Bi24O31Cl10的物相,片状形貌,但其片状大小明显变小且厚度变薄,光吸收性能增强,光生电子-空穴复合率下降,与纯Bi24O31Cl10相比,Fe^3+掺杂能显著提高Bi24O31Cl10的光催化活性,当Fe^3+掺杂量为0.5%(摩尔分数)时,对Bi24O31Cl10的光催化性能促进最高,在可见光下光照50 min,对RhB的脱色率可达75%,较纯Bi24O31Cl10提高了44%。

Preparation of Fe3+ doped Bi24O31Cl10 by modified solution combustion method and its photocatalytic properties

Fe-Bi24O31Cl10 photocatalytic materials were prepared by modified solution combustion method using bismuth nitrate,citric acid,ammonium chloride and ferric nitrate as raw materials.The influence of Fe 3+doping on its photocatalytic performance was evaluated by degrading rhodamine B in visible light.XRD,XPS,UV-vis,SEM,HTEM and FT-IR were used to study the effects of different Fe 3+doping amount on the phase,elemental valence,optical absorption performance,microscopic morphology and particle distribution,crystal surface spacing and chemical structure composition of Bi24O31Cl10.The results show that doped Fe 3+does not change the phase and morphology of Bi24O31Cl10,but its sheet size is obviously smaller,its thickness is thinner,its optical absorption property is enhanced,and the photoelectron hole recombination ratio is decreased.Compared with pure Bi24O31Cl10,Fe^3+doping can significantly improve the photocatalytic activity of Bi24O31Cl10.The photocatalytic activity of Bi24O31Cl10 is the highest when the doping amount of Fe^3+is 0.5%(mole fraction),and the decolorization rate of RhB is 75%when exposed to visible light for 50 min,which is 44%higher than that of pure Bi24O31Cl10.