Post Graduate and Research Department of Physics, The American College, Madurai, 625002, Tamil Nadu, India; School of Physics, Madurai Kamaraj University, Madurai, 625021, Tamil Nadu, India.
Post Graduate and Research Department of Physics, The American College, Madurai, 625002, Tamil Nadu, India.
Environ Res. 2021 Aug;199:111369. doi: 10.1016/j.envres.2021.111369. Epub 2021 May 24.
Herein, we report the synthesis and characterizations of Vanadium pentoxide (VO) nanorods/graphene oxide (GO) nanocomposite as efficient direct solar light driven photocatalyst for the enhanced degradation of victoria blue (VB) dye. The nanocomposite was synthesized by sonochemical process and characterized using several analytical methods in order to study the structural, morphological, compositional, optical and photocatalytic properties. The X-ray diffraction studies confirmed the orthorhombic structure of VO while the morphological examinations revealed the growth of VO nanorods and 2D GO sheets. Interestingly, the UV studies ratify that the bandgap of the nanocomposite was reduced compared to pure GO and VO. Interestingly, the interaction of the VO nanorods with the graphene oxide substrate and its effect on the electronic properties of the combined system, have been examined by means of theoretical calculations, based on the so called Geometry, Frequency, Noncovalent, eXtended Tight Binding (GFN-xTB) method. Studying the photocatalytic behavior of nanocomposite, we observe an almost complete degradation (97.95%) of Victoria Blue (VB) dye under direct sunlight illumination within just 90 min. The outstanding nanocomposite photocatalytic efficiency was due to the excellent transfer of interfacial charge and the suppressed recombination of charge-carrier. The kinetics of the degradation process was also analyzed by calculating the rate constant and half-life time. Finally, a possible mechanism has also been discussed for the degradation process of VB dye using nanocomposite under direct sunlight irradiation.
在此，我们报告了五氧化二钒（VO）纳米棒/氧化石墨烯（GO）纳米复合材料的合成与表征，该复合材料作为高效的直接太阳光驱动光催化剂，可增强维多利亚蓝（VB）染料的降解。该纳米复合材料通过超声化学法合成，并通过多种分析方法进行了表征，以研究其结构、形态、组成、光学和光催化性能。X 射线衍射研究证实了 VO 的正交结构，而形态研究则揭示了 VO 纳米棒和 2D GO 片的生长。有趣的是，紫外研究证实，与纯 GO 和 VO 相比，纳米复合材料的带隙减小。有趣的是，通过基于所谓的几何形状、频率、非共价、扩展紧束缚（GFN-xTB）方法的理论计算，研究了 VO 纳米棒与氧化石墨烯基底的相互作用及其对组合系统电子性质的影响。研究纳米复合材料的光催化行为时，我们观察到在直接阳光照射下，维多利亚蓝（VB）染料几乎完全降解（97.95%），仅需 90 分钟。纳米复合材料出色的光催化效率归因于界面电荷的优异转移和载流子复合的抑制。还通过计算速率常数和半衰期来分析降解过程的动力学。最后，还讨论了在直接阳光照射下使用纳米复合材料降解 VB 染料的可能机制。
