Shahid Wajeehah, Idrees Faryal, Zou Ji-Jun, Choi Jeong Ryeol, Pan Lun
Department of Physics, The University of Lahore, Lahore 54000, Pakistan.
Department of Physics, University of the Punjab, Lahore 54590, Pakistan.
Nanomaterials (Basel). 2024 Dec 27;15(1):28. doi: 10.3390/nano15010028.
This study focuses on achieving high photocatalytic activity using MoS/TiO heterostructures (MOT). To this end, MoS and TiO were synthesized by employing hydrothermal synthesis techniques, and then MoS/TiO heterostructures were synthesized by using 1:1, 1:2, 1:3, and 1:4 ratios of MoS and TiO, respectively. While the structural and electronic changes for the 1:2 and 1:3 ratios were relatively minor, significant modifications in bandgaps and morphology were observed for the 1:1 and 1:4 ratios. Thus, this study presents a comparative analysis of the photocatalytic performance of the 1:1 (MOT11) and 1:4 (MOT14) heterostructures. The formation of these heterostructures was confirmed through Energy-Dispersive X-ray Spectroscopy (EDX) and Fourier Transform Infrared Spectroscopy (FTIR) analysis. Notably, the bandgaps of MOT11 and MOT14 were red-shifted to 1.66-1.25 eV and 1.01-1.68 eV, respectively, indicating improved visible-light absorption capabilities. The photocatalytic activity of MOT11 and MOT14 was evaluated through the degradation of Rhodamine B (RhB) under simulated solar irradiation. MOT11 demonstrated a high degradation efficiency of 98.9% within 60 min, while MOT14 achieved 98.21% degradation after 90 min of irradiation. The significance of this study lies in its demonstration that a facile synthesis route and a small proportion of MoS in the heterostructure can achieve excellent photocatalytic degradation performance under solar light. After MS-analysis, S-Scheme has been suggested, which has also been complimented by the scavenger tests. Additionally, the improved photocatalytic properties of MOT11 and MOT14 suggest their potential for future applications in hydrogen generation and water splitting, offering a pathway towards sustainable and clean energy production.
本研究着重于利用MoS/TiO异质结构（MOT）实现高光催化活性。为此，采用水热合成技术合成了MoS和TiO，然后分别以MoS与TiO的比例为1:1、1:2、1:3和1:4合成了MoS/TiO异质结构。虽然1:2和1:3比例的结构和电子变化相对较小，但1:1和1:4比例的带隙和形态有显著改变。因此，本研究对1:1（MOT11）和1:4（MOT14）异质结构的光催化性能进行了对比分析。通过能量色散X射线光谱（EDX）和傅里叶变换红外光谱（FTIR）分析证实了这些异质结构的形成。值得注意的是，MOT11和MOT14的带隙分别红移至1.66 - 1.25 eV和1.01 - 1.68 eV，表明可见光吸收能力有所提高。通过在模拟太阳辐射下降解罗丹明B（RhB）来评估MOT11和MOT14的光催化活性。MOT11在60分钟内展现出98.9%的高降解效率，而MOT14在照射90分钟后降解率达到98.21%。本研究的意义在于证明了一种简便的合成路线以及异质结构中少量的MoS能够在太阳光下实现优异的光催化降解性能。经过质谱分析后，提出了S型机制，清除剂测试也证实了这一点。此外，MOT11和MOT14改善的光催化性能表明它们在未来制氢和水分解应用中的潜力，为可持续清洁能源生产提供了一条途径。
