【摘要】 探索低温液相法合成掺Fe的Fe∶ZnO,Fe∶Zn摩尔比为0.01~0.03,通过调整氢氧化钠的量来控制氧化锌的微观形貌,利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能谱仪(EDS)、紫外-可见光谱(UV-vis)、荧光光谱(PL)对所合成的材料进行表征,采用紫外照射测试样品对甲基橙的光催化降解率。结果表明:在80℃水溶液环境下低温合成及随后干燥,成功制备出了掺杂不同Fe含量的Fe∶ZnO纳米片,所获得的样品均为纤锌矿结构,结晶度高。随着Fe掺杂量的增加,样品的紫外-可见吸收光谱红移,在可见光区吸收增大,带隙减小;适量的Fe掺杂可以降低样品光生电子与空穴的复合率,提高样品光催化性能。掺杂Fe量为1.5%的Fe∶ZnO的样品光催化降解甲基橙的效率最高,紫外光照反应5h后对甲基橙的光催化降解率相对于纯的ZnO提高了43.8%。更多还原

【Abstract】 Preparation and photocatalytic activity of Fe-doped ZnO with Fe/Zn molar ratio of 0.01~0.03by low-temperature solution method were investigated.The micro-morphology of the Fe-doped ZnO samples was adjusted through the addition of NaOH solution.Using X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),X-ray energy spectrometer(EDS),ultraviolet and visible(UV-vis)spectrophotometer,and photoluminescence(PL)spectroscopy,the structure, morphology and optical properties of Fe doped ZnO samples were characterized.And their photocatalytic activity towards degradation of methyl orange(MO)under ultraviolet irradiation were tested.The results show that Fe-doped ZnO nanosheets with different contents of Fe can be successfully synthesized at 80℃in aqueous solution and then well crystallized with hexagonal wurtzite structure after drying.With the increase of Fe doping in the samples,a red shift in UV-vis spectra can be detected and the band gap is narrower than the theoretical value.Furthermore,an appropriate Fe concentration of Fe-doped ZnO decreases the recombination rate of free charge carriers,thus enhances their photocatalytic activity.The Fe∶ZnO sample with 1.5at% Fe exhibits the best photocatalytic activity towards degradation of MO,and its degradation rate is improved by 43.8% over pure ZnO when irradiated under UV lamp during 5hours.更多还原