Althabaiti Shaeel Ahmed, Khan Zaheer, Narasimharao Katabathini, Bawaked Salem Mohamed, Al-Sheheri Soad Zahir, Mokhtar Mohamed, Malik Maqsood Ahmad
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi-110025, India.
Nanomaterials (Basel). 2023 Jul 15;13(14):2076. doi: 10.3390/nano13142076.
An Ag-modified TiO nanomaterial was prepared by a one-pot synthesis method using tetra butyl titanate, silver nitrate, and sodium hydroxide in water at 473 K for 3 h. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to determine the structure and morphology of the synthesized Ag-modified TiO nanomaterial. The diffuse reflectance UV-visible and photoluminescence spectroscopy results revealed that metallic Ag nanoparticles decreased the optical band gap and photoluminescence intensity of the TiO. In addition, the Raman peak intensity and absorbance were increased after Ag modification onto TiO. The photocatalytic efficiency of the synthesized samples was tested for decomposition of aqueous hydrazine solution under visible light irradiation. The photocatalytic efficiency of Ag-modified TiO nanomaterials was higher than that of bare TiO and Ag metal NPs due to the synergistic effect between the Ag metal and TiO structures. In addition, the surface plasmon resonance (SPR) electron transfer from Ag metal particles to the conduction band of TiO is responsible for superior activity of TiO-Ag catalyst. The Ag-modified TiO nanomaterials offered a 100% H selectivity within 30 min of reaction time and an apparent rate constant of 0.018 min with an activation energy of 34.4 kJ/mol under visible light radiation.
采用一锅合成法，以钛酸四丁酯、硝酸银和氢氧化钠为原料，在473 K的水中反应3 h，制备了一种银修饰的TiO纳米材料。利用X射线衍射、扫描电子显微镜和透射电子显微镜确定了合成的银修饰TiO纳米材料的结构和形貌。漫反射紫外可见光谱和光致发光光谱结果表明，金属Ag纳米颗粒降低了TiO的光学带隙和光致发光强度。此外，在TiO上修饰Ag后，拉曼峰强度和吸光度增加。在可见光照射下，测试了合成样品对水合肼溶液分解的光催化效率。由于Ag金属与TiO结构之间的协同效应，Ag修饰的TiO纳米材料的光催化效率高于纯TiO和Ag金属纳米颗粒。此外，从Ag金属颗粒到TiO导带的表面等离子体共振（SPR）电子转移是TiO-Ag催化剂具有优异活性的原因。在可见光辐射下，Ag修饰的TiO纳米材料在30分钟的反应时间内提供了100%的H选择性，表观速率常数为0.018 min，活化能为34.4 kJ/mol。
