生物质模板法制备Bi掺杂ZnO及其太阳光催化性能

Biotemplate Synthesis of Bismuth-doped ZnO Sunlight Catalyst and Its Photocatalytic Property under Sunlight

采用生物质模板法,以脱脂棉为模板、Zn(OAC)_(2)·2H_(2)O为锌源、Bi(NO_(3))_(3)·5H_(2)O为铋源、乙醇-水为溶剂,在不同的浸泡时间、焙烧温度、焙烧时间和掺杂摩尔分数下通过浸渍-热转化制备了一系列Bi_(2)O_(3)/ZnO催化剂。使用扫描电子显微镜、热重分析、X-射线衍射等技术表征了产物形貌和结构。以亚甲基蓝作为模板反应,太阳光为光源,考察了Bi_(2)O_(3)/ZnO系列材料的光催化活性。结果表明,在浸泡2 h、焙烧温度为600℃、焙烧时间为2 h的条件下制得的Bi掺杂量为Zn摩尔分数1.0%的Bi_(2)O_(3)/ZnO催化剂,在太阳光照射390 min时对亚甲基蓝的降解效果最佳,降解率高达95.21%。与纯ZnO相比,降解率提高了16.77%。Bi_(2)O_(3)/ZnO具有良好的稳定性和可循环使用性,在光降解偶氮染料方面具有潜在的应用价值。

Using biological template,a series of Bi_(2)O_(3)/ZnO composites with different Bi doping amount were prepared by using Zn(OAC)_(2)·2H_(2)O and Bi(NO_(3))_(3)·5H_(2)O as raw materials,cotton fiber as template,ethanol-water as solvent via impregnation-thermal conversion under different immersion time,calcination temperature,calcination time and Bi contents in mole percent.The samples were characterized by scanning electron microscopy(SEM),thermal gravimetric analyzer(TGA),X-ray diffraction(XRD),and its photocatalytic degradation of methylene blue was investigated under sunlight.The results showed that 1.0%Bi_(2)O_(3)/ZnO could be produced under the optimum fabrication condition of immersion time 2 h,calcination temperature 600℃,and calcination time 2 h,and its best degradation rate of methylene blue could be as high as 95.21%under sunlight irradiation of 390 min.Compared with pure ZnO,the degradation rate is increased by 16.77%.Bi_(2)O_(3)/ZnO catalyst has good stability and recyclability,and has potential application value in photo degradation of azo dyes.