Luan Jingfei, Zhuang Yan
School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
Materials (Basel). 2018 Feb 18;11(2):303. doi: 10.3390/ma11020303.
A novel photocatalyst ZnBiErO₄ was firstly synthesized by solid-state reaction method and its structural and photocatalytic properties were analyzed by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-Vis diffuse reflectance. The results demonstrated that ZnBiErO₄ crystallized with tetragonal crystal structure with space group I41/A. The lattice parameters for ZnBiErO₄ were proved to be a = b = 10.255738 Å and c = 9.938888 Å. The band gap of ZnBiErO₄ was estimated to be about 1.69 eV. Compared with nitrogen doped TiO₂, ZnBiErO₄ showed excellent photocatalytic activities for degrading methyl blue during visible light irradiation. The photocatalytic degradation of methyl blue with ZnBiErO₄ or N-doped TiO₂ as catalyst followed the first-order reaction kinetics. Moreover, the apparent first-order rate constant of ZnBiErO₄ or N-doped TiO₂ was 0.01607 min or 0.00435 min. The reduction of total organic carbon, formation of inorganic products, such as SO₄ and NO₃ and the evolution of CO₂ revealed the continuous mineralization of methyl blue during the photocatalytic process. ZnBiErO₄ photocatalyst had great potential to purify textile industry wastewater.
首次通过固相反应法合成了一种新型光催化剂ZnBiErO₄，并通过扫描电子显微镜、X射线衍射、X射线光电子能谱和紫外-可见漫反射对其结构和光催化性能进行了分析。结果表明，ZnBiErO₄以四方晶系结晶，空间群为I41/A。ZnBiErO₄的晶格参数经证实为a = b = 10.255738 Å，c = 9.938888 Å。ZnBiErO₄的带隙估计约为1.69 eV。与氮掺杂TiO₂相比，ZnBiErO₄在可见光照射下对降解亚甲基蓝表现出优异的光催化活性。以ZnBiErO₄或氮掺杂TiO₂为催化剂对亚甲基蓝进行光催化降解遵循一级反应动力学。此外，ZnBiErO₄或氮掺杂TiO₂的表观一级速率常数分别为0.01607 min⁻¹或0.00435 min⁻¹。总有机碳的减少、无机产物如SO₄²⁻和NO₃⁻的形成以及CO₂的释放揭示了光催化过程中亚甲基蓝的持续矿化。ZnBiErO₄光催化剂在净化纺织工业废水方面具有巨大潜力。
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