Ni掺杂Bi_(12)TiO_(20)纳米纤维的电纺制备及其光催化性能

Study on Preparation by Electrospinning Technology and Photocatalytic Activity of Ni-doped Bi_(12)TiO_(20) Nanofibers

以硝酸铋、钛酸四丁酯、硝酸镍、无水乙醇、N,N-二甲基甲酰胺和聚乙烯吡咯烷酮K90(PVP K90)为原料,采用静电纺丝法制备出间隙型Ni掺杂Bi_(12)TiO_(20)纳米纤维,并采用XRD、EDS、SEM和UV-Vis等测试手段对制备产物的物相、微观形貌及吸光性质进行了表征;以甲基橙(MO)为目标污染物,研究了制备产物在模拟日光照射下的光催化性能;基于密度泛函理论(DFT)对Ni的掺杂位置进行了模拟。结果表明:Ni以间隙原子的形式掺杂到Bi_(12)TiO_(20)的晶格中,Ni掺杂使材料的吸收光谱红移,提高了其可见光的利用率。在模拟日光照射下,以优选的Ni与Bi_(12)TiO_(20)的物质的量的比为1∶40的Ni掺杂Bi_(12)TiO_(20)纳米纤维为光催化剂降解MO溶液60 min,降解率达到98.07%,高出Bi_(12)TiO_(20)纳米纤维的降解率24.03%。

The interstitial Ni-doped Bi（12）TiO（20） nanofibers were synthesized by electrospinning method,in which Bi（NO3）3·5H2O,Ni（NO3）2·6 H2O,Ti（C4H9O）4,DMF,C2H5OH and PVP（K90）were used as raw materials.The prepared nanofibers were characterized by XRD,EDS,SEM andUV-Vis.The photocatalytic activity of the productswas investigated by the degradation of methyl orange（MO）.The doping sites of Ni were simulated on the basis of the density functional theory（DFT）.The results showed that Ni doped into the lattice interstitial site of Bi（12）TiO（20）,leading to absorption spectroscopy shifts to visible light area and then enhancing Ni-doped Bi（12）TiO（20） photocatalytic activityin range of the visible light.Usingthe Ni-doped Bi（12）TiO（20） nanofibers with 1∶40 molar ratio of Ni to Bi（12）TiO（20） as the photocatalyst,the degradation rate of MO reached 98.07% under the simulated light irradiation for 60 min and increased 24.03%than that of Bi（12）TiO（20） nanofibers.