Qi Wei, Yang Yang, Du Jifu, Yang Jun, Guo Limin, Zhao Long
Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China.
J Colloid Interface Sci. 2021 Dec;603:594-603. doi: 10.1016/j.jcis.2021.06.109. Epub 2021 Jun 22.
Photodegradation has attracted much attention in wastewater treatment owing to its nontoxicity, high efficiency, and mild reaction conditions. Recently, Zr/Ag co-doped titanium dioxide (TiO) nanoparticles have been synthesized and showed high photocatalytic activity for dye, but these nanoparticles tend to aggregate together, leading to reduced catalytic sites, which is disadvantageous for their practical application. Therefore, Zr/Ag-co-doped TiO nanofibers were prepared using an electrospinning method. For comparison, TiO nanofibers and Zr-doped TiO nanofibers were also fabricated. The synthesized catalysts were characterized by X-ray diffraction, UV-visible absorption spectroscopy, diffuse reflectance spectroscopy, scanning electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, zeta potentials, photoluminescence, and electrochemical impedance spectroscopy. Compared with TiO nanofibers and Zr-doped TiO, Zr/Ag co-doped TiO nanofibers have significantly enhanced photocatalytic activity for Congo red owing to the synergetic effects of Zr, Ag, and Ti. The photodegradation of Congo red followed a pseudo-first-order kinetic model. The optimal Zr/Ag-co-doped TiO nanofibers with 2 wt% Ag and a mass ratio of ZrO to TiO of 1:9 exhibits the best photocatalytic activity and the corresponding kinetic constant of 0.0405 min is 12 times higher than that of TiO nanofibers. This work will provide data and a technology base for the synthesis of future materials with high photocatalytic activity.
光降解因其无毒、高效和反应条件温和而在废水处理中备受关注。最近，合成了Zr/Ag共掺杂的二氧化钛（TiO₂）纳米颗粒，其对染料表现出高光催化活性，但这些纳米颗粒容易聚集在一起，导致催化位点减少，不利于其实际应用。因此，采用静电纺丝法制备了Zr/Ag共掺杂的TiO₂纳米纤维。为了进行比较，还制备了TiO₂纳米纤维和Zr掺杂的TiO₂纳米纤维。通过X射线衍射、紫外可见吸收光谱、漫反射光谱、扫描电子显微镜、衰减全反射傅里叶变换红外光谱、zeta电位、光致发光和电化学阻抗谱对合成的催化剂进行了表征。与TiO₂纳米纤维和Zr掺杂的TiO₂相比，由于Zr、Ag和Ti的协同效应，Zr/Ag共掺杂的TiO₂纳米纤维对刚果红的光催化活性显著增强。刚果红的光降解遵循准一级动力学模型。含2 wt% Ag且ZrO₂与TiO₂质量比为1:9的最佳Zr/Ag共掺杂TiO₂纳米纤维表现出最佳的光催化活性，其相应的动力学常数为0.0405 min⁻¹，比TiO₂纳米纤维高12倍。这项工作将为未来高光催化活性材料的合成提供数据和技术基础。
