Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt.
Nanoscience Laboratory for Environmental and Bio-medical Applications (NLEBA), Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt.
Environ Sci Pollut Res Int. 2021 Jun;28(23):29665-29680. doi: 10.1007/s11356-021-12680-9. Epub 2021 Feb 10.
The pyrolysis of melamine was an effective one-pot method for preparing a nanostructured multifunctional photocatalytic based on core/shell g-CN@TiO heterojunction. Various techniques entirely characterized these materials: X-ray diffraction (XRD) proved to enhance the as-prepared materials' crystallinity through the variation of dislocation, strain, and crystallite size with TiO loading. The stacked layered/sheet-like with a smooth surface of the as-prepared samples have been shown via scanning electron microscopy (SEM). Diffuse reflectance spectroscopy (DRS) showed an apparent decrease in the energy bandgap for these nanocomposites with TiO loading. All the prepared materials were subjected to visible photocatalytic applications under the same conditions. The dye model (Methylene Blue, MB), and antibiotic model (Amoxicillin, AMO), was photodegraded using the as-prepared nanocomposites under visible light irradiation. In the recombination reduction among TiO and g-CN interfaces, g-CN has been effectively utilized as a matrix. Our findings proved that g-CN@TiO photocatalysts exhibited superior photocatalytic performance. CNT-5 of 2.58 eV bandgap had a higher activity of 99.7 in 50 min for MB and 100% in 20 min for AMO than the other represented photocatalysts in this work. The migration of photogenerated electrons from a g-CN to TiO via heterojunction among them as g-CN (1 0 1) removes the electrons accumulated on (1 0 1) of TiO, improve the photodegradation efficiency. Therefore, the increase in photocatalytic reaction rates, recycling, and the sample's photostability can be considered the result of successful interactions among the TiO and g-CN systems. The suggested photodegradation mechanism of MB and AMO was discussed in detail and compared with previously reported work. Therefore, the photodegradation rate of MB and AMO via CNT-5 composite is 6 and 3 times, respectively, higher than that of g-CN under simulated solar irradiation. This research creates a new perspective on the production of nanocomposite materials in the area of treatment of pharmaceutical and dye contaminants.
三聚氰胺的热解是一种有效的一锅法，用于制备基于核/壳 g-CN@TiO 异质结的纳米结构多功能光催化剂。各种技术完全表征了这些材料：X 射线衍射 (XRD) 通过变化位错、应变和晶粒尺寸与 TiO 负载证明了提高了所制备材料的结晶度。通过扫描电子显微镜 (SEM) 显示，所制备样品的堆叠层状/片状具有光滑的表面。漫反射光谱 (DRS) 表明，随着 TiO 负载的增加，这些纳米复合材料的能带隙明显减小。所有制备的材料都在相同条件下进行了可见光光催化应用。在可见光照射下，用所制备的纳米复合材料降解了染料模型（亚甲蓝，MB）和抗生素模型（阿莫西林，AMO）。在 TiO 和 g-CN 界面之间的复合还原中，g-CN 被有效地用作基质。我们的研究结果证明，g-CN@TiO 光催化剂表现出优异的光催化性能。与这项工作中代表的其他光催化剂相比，具有 2.58 eV 带隙的 CNT-5 对 MB 的活性更高，在 50 分钟内达到 99.7%，对 AMO 的活性在 20 分钟内达到 100%。光生电子从 g-CN 到 TiO 的迁移通过它们之间的异质结，即 g-CN(101)去除了在 TiO(101)上积累的电子，提高了光降解效率。因此，可以认为光催化反应速率的提高、回收和样品的光稳定性是 TiO 和 g-CN 系统之间成功相互作用的结果。详细讨论了 MB 和 AMO 的光降解机理，并与以前的报道工作进行了比较。因此，在模拟太阳光照射下，通过 CNT-5 复合材料光降解 MB 和 AMO 的速率分别比 g-CN 高 6 倍和 3 倍。这项研究为制药和染料污染物处理领域的纳米复合材料的生产开辟了新的视角。
