摘要
采用低温液相氧化还原法制备了Ag掺杂MnO_2。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、比表面积(BET)、X射线能谱(EDS)和傅里叶变换红外光谱(FT-IR)对制备的样品进行了表征分析。以Ag掺杂MnO_2为催化剂,在室温、常压、无光照条件下对甲醛气体进行了催化降解实验。结果表明:Ag掺杂有效提高了MnO_2的催化活性和对甲醛降解效果,当Ag掺杂量为5%(wt,质量分数,下同)时,催化活性最高。20g Ag掺杂量为5%的Ag-MnO_2对初始浓度为20mg/m~3的甲醛气体催化降解4h时,有效降解率达99.65%。
Ag-doped MnO_2catalysts were fabricated using the method of low-temperature liquid phase redox.The prepared samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),brunauer emmett teller(BET),X-ray energy dispersive spectroscopy(EDS)and fourier transform infrared spectroscopy(FT-IR).The catalytic degradation of formaldehyde was conducted under normal temperature and pressure as well as without illumination.The results indicated that the appropriate amount of Ag doping significantly increased the catalytic activity,and Ag-doped MnO_(2 )with 5%doping amount of Ag showed the highest catalytic activity.The effective degradation efficiency reached 99.65%,while formaldehyde with initial concentration of 20mg/m~(3 )was degraded by 20g of 5Ag-MnO_2for 4h.
引文
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