【摘要】 为提高ZnO的光催化性和稳定性,扩展对光的吸收范围,以乙二胺四乙酸（H4EDTA）为配体形成配位前驱体,通过低温热分解配位前驱体法制备了Gd³⁺掺杂ZnO复合物Zn1-xGdxO₂（x=0～0. 1）纳米颗粒。采用X射线粉末衍射（XRD）、红外光谱法（FT-IR）、扫描电子显微镜（SEM）、荧光光谱法（FL）、紫外可见漫反射光谱法（UV-Vis DRS）、交流阻抗（EIS）以及动态光电流响应（i-t）等多种手段研究掺杂比例对氧化锌物相、表面形貌、光学性以及光电响应性等的影响。结果表明,Gd³⁺掺杂摩尔分数低于3%时,产物为单相纤锌矿ZnO,提高掺杂比例（> 3%）不仅使ZnO晶格萎缩,同时还出现少量Gd₂O₃第二相,且晶粒随掺杂摩尔分数的增加而降低。Gd³⁺掺杂使ZnO能带结构发生改变,其价带、导带和带隙等各值都随着掺杂摩尔分数的增加而降低。I-t结果表明,适量掺杂可提高ZnO的光电响应能力,其中掺杂摩尔分数1%所得ZnO的光电流密度最大（10 m A/m²）。甲基橙（MO）的光降解结果显示,Gd³⁺掺杂能提高ZnO的催光化性,其中1%掺杂对ZnO的催化性提高最大。最后还对ZnO的催化选择性和耐酸碱性进行了简单研究。更多还原

【Abstract】 In order to improve photocatalytic activity and acid-resistant alkalinity of ZnO and expand the absorption range of light,nanosized ZnO particles doped with Gd³⁺（ Zn1-xGdxO₂（ x = 0 ～ 0. 1）） were synthesized by thermal decomposition of the coordinated precursor,in which ethylenediamine tetraacetic acid（ H₄EDTA） is the ligand. Effects of the doping amount of Gd³⁺on the structure,phase,morphology,optical properties and photo-electrical behaviors of ZnO were studied by X-ray diffraction（ XRD） spectrometry,ultraviolet-visible diffuse reflection spectroscopy（ UV-Vis DRS）, Fourier transform infrared（ FT-IR）spectroscopy, flurescence spectroscopy（ FL）, scanning electron microscopy（ SEM）, electrochemical impedance spectroscopy（ EIS）,dynamic photoelectrical current curve（ i-t）,etc. XRD results show that when the amount of Gd³⁺is below 3%,there is a single phase of ZnO with hexagonal wurtzite structure. With the increase of Gd³⁺doping（ > 3%）,a little bit of second phase of Gd₂O₃ shows up and the grain size of ZnO is reduced. From i-t results,Gd³⁺doping amount of 1% exhibits the biggest current density of 10 m A/m². With the increase of Gd³⁺doping,the band structure of ZnO is changed,the value of conduction band（ CB）,valence band（ VB） and band-gap value（ Eg） of ZnO are all reduced. At the same time,photo-degradation results of methyl orange（ MO） reveal that Gd³⁺doping can enhance the photocatalytic activity of ZnO,and the suitable amount is 1%. The catalytic selectivity and acid-resistant alkalinity of ZnO and Gd-doped ZnO were also studied simply.更多还原