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首页> 外文期刊>Applied Surface Science >Evaluation of bimetal doped TiO2 in dye fragmentation and its comparison to mono-metal doped and bare catalysts
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Evaluation of bimetal doped TiO2 in dye fragmentation and its comparison to mono-metal doped and bare catalysts

机译：染料碎裂中双金属掺杂的TiO2的评估及其与单金属掺杂和裸露催化剂的比较

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There are instances that bimetal doped semiconductor materials impart superior photocatalytic activity than bare and mono-metal doping. In this study, visible light responsive mono- (Cu/TiO2 and Ni/TiO2) and bi-metal doped (Cu-Ni/TiO2) TiO2 photocatalysts with wide band gap energy were synthesized via co-precipitation method with an equal mass ratio of Cu and Ni. The catalyst characterization was performed using Diffuse Reflectance UV-visible (DR-UV-vis) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, X-ray Diffraction (XRD), zeta-potential and Transmission Electron Microscopy (TEM) analyzes. The charge balancing effect of Cu and Ni caused a notable reduction in the optical band gap of TiO2 to 2.91 eV with Cu-Ni/TiO2. The synthesis method increased the anatase phase significantly along with the crystallite size. Cu-Ni/TiO2 displayed a lesser destabilization tendency, and the absolute value of zeta-potentials increased much at pH > pH(zpc) resulted from the higher oxygen vacancies. The activity of Ni/TiO2, Cu/TiO2, and Cu-Ni/TiO2 was tested for the degradation dynamics and kinetics of Eriochrome Cyanine Red (ECR), an anionic dye. Cu doping exhibited a better dye decomposition because of the low recombination rate of electron/hole pair as a full 3d sub-level of Cu is energetically more favorable than a full 4s sub-level of Ni. The mechanism of dye decomposition releasing inorganic ions is also proposed and validated from the mass spectra. (C) 2016 Elsevier B.V. All rights reserved.
机译：在某些情况下，双金属掺杂的半导体材料比裸金属和单金属掺杂具有更高的光催化活性。本研究通过共沉淀法合成了具有宽带隙能的可见光响应型单（Cu / TiO2和Ni / TiO2）和双金属掺杂的（Cu-Ni / TiO2）TiO2光催化剂。铜和镍。使用漫反射紫外可见（DR-UV-vis）光谱，傅立叶变换红外（FTIR）光谱，X射线衍射（XRD），ζ电位和透射电子显微镜（TEM）分析进行催化剂表征。 Cu和Ni的电荷平衡效应使Cu-Ni / TiO2将TiO2的光学带隙显着减小到2.91eV。合成方法与晶体尺寸一起显着增加了锐钛矿相。 Cu-Ni / TiO2表现出较小的去稳定趋势，并且由于较高的氧空位，在pH> pH（zpc）时，ζ电位的绝对值增加了很多。测试了Ni / TiO2，Cu / TiO2和Cu-Ni / TiO2的活性对阴离子染料Eriochrome Cyanine Red（ECR）的降解动力学和动力学。由于电子/空穴对的低重组率，Cu掺杂表现出更好的染料分解，因为从能量上讲，Cu的完整3d亚能级比Ni的完整4s亚能级更有利。还提出了染料分解释放无机离子的机理，并通过质谱进行了验证。 （C）2016 Elsevier B.V.保留所有权利。

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