<br>NiO 纳米颗粒增强 TiO2 结构性能的作用及其在光降解和析氢中的应用,ACS Omega

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NiO 纳米颗粒增强 TiO2 结构性能的作用及其在光降解和析氢中的应用
ACS Omega ( IF 3.7 ) Pub Date : 2021-11-03 , DOI: 10.1021/acsomega.1c03693
Mohammed A Mannaa ₁ , Khaled F Qasim ₂ , Fares T Alshorifi _{3,

4} , Salah M El-Bahy ₅ , Reda S Salama ₆

Affiliation

以十六烷基三甲基溴化铵为模板，通过表面活性剂辅助溶胶-凝胶法制备了不同 NiO 负载量（3-20.0 wt%）的纯介孔 TiO ₂纳米粒子和改性介孔 TiO 2 纳米粒子。使用N ₂吸附-脱附分析、能量色散光谱、扫描电子显微镜、透射电子显微镜、X射线衍射、X射线光电子能谱、紫外-可见光谱、傅里叶变换红外光谱检查了不同样品的光学和结构性质。光谱学和光致发光（PL）光谱学。 X射线衍射结果证实Ni ²⁺插入到TiO ₂晶格中，并且添加NiO后晶粒尺寸显着减小。漫反射光谱吸收边出现明显红移，添加NiO后可见光区出现新的吸收带，表明表面缺陷和氧空位的形成。当NiO含量增加时，TiO ₂的光学带隙急剧减小。使用 PL 光谱检查表面缺陷和氧空位的增加。研究了合成样品在可见光下光降解亮绿（BG）和苯酚以及产生氢气的光催化性能。 10% NiO/TiO ₂表现出最高的光催化效率。由于NiO/TiO ₂界面上p-n结的形成，光催化活性得到提高，有效促进了光生电子/空穴对的分离，从而增强了其光降解活性。根据光催化活性结果，NiO含量被认为是影响BG和苯酚光降解以及H ₂析出的最重要因素之一。此外，我们还讨论了 BG 和苯酚的光降解、矿化（总有机碳）和光催化反应动力学的机制。

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Role of NiO Nanoparticles in Enhancing Structure Properties of TiO2 and Its Applications in Photodegradation and Hydrogen Evolution

Pure and modified mesoporous TiO₂ nanoparticles with different loadings of NiO (3–20.0 wt %) were prepared through the surfactant-assisted sol–gel approach with the use of cetyltrimethylammonium bromide as a template. The optical and structural properties of different samples were examined using N₂ adsorption–desorption analysis, energy-dispersive spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV–vis spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence (PL) spectroscopy. X-ray diffraction results confirmed the insertion of Ni²⁺ into the lattice of TiO₂, and the crystallite size reduced remarkably after the addition of NiO. The diffuse reflectance spectroscopy spectra displayed obvious red shift in the absorption edges, and new absorption bands appeared in the visible region when NiO was added, which indicates the formation of surface defects and oxygen vacancies. The optical band gap of TiO₂ reduced sharply when the contents of NiO were increased. The increase in the surface defects as well as oxygen vacancies were examined using PL spectroscopy. The photocatalytic performance of the as-synthesized samples was investigated over photodegradation of brilliant green (BG) and phenol and hydrogen generation under visible light. 10% NiO/TiO₂ exhibited the highest photocatalytic efficiency. The photocatalytic activity was improved due to the creation of a p–n junction at the interface of NiO/TiO₂, which efficiently promotes the separation of photogenerated electron/hole pairs and consequently enhances its photodegradation activity. According to the photocatalytic activity results, NiO contents were considered one of the most important factors affecting the photodegradation of BG and phenol and H₂ evolution. Also, we discussed the mechanism of photodegradation, mineralization (total organic carbon), and photocatalytic reaction kinetics of BG and phenol.

更新日期：2021-11-16

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