Department of Chemistry, Christ University, Hosur Road, Bengaluru 560029, Karnataka, India.
Department of Chemistry, Christ University, Hosur Road, Bengaluru 560029, Karnataka, India.
J Photochem Photobiol B. 2018 Oct;187:25-34. doi: 10.1016/j.jphotobiol.2018.07.022. Epub 2018 Aug 2.
The effect of surfactant and dopant on the properties of zinc oxide nanoparticles were studied by preparing polyethylene glycol (PEG) capped ZnO and tungsten doped PEG capped ZnO nanoparticles via the electrochemical method. These nanoparticles were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Ultraviolet Diffuse Reflection Spectroscopy (UV-DRS), Scanning Electron Microscopy (SEM) and Electron Dispersive Analysis of X Rays (EDAX). The photocatalytic degradation of malachite green dye using these nanoparticles was studied under visible light. The effects of various reaction parameters like dye concentration, catalyst concentration, pH and time were studied to optimize the photodegradation reaction. Reusability of these nanoparticles was studied and no significant change was observed in the degradation efficiency of PEG capped ZnO till the fourth cycle, while there was a gradual decrease in the degradation efficiency of tungsten doped PEG capped ZnO. Langmuir- Hinshelwood kinetic model well describes the photodegradation capacity and the degradation of malachite green follows pseudo-first order kinetics.Photocatalytic studies reveal that PEG capping increases the degradation properties of ZnO while tungsten doping decreases the extent of PEG capping and has a detrimental effect on the degradation properties of ZnO. The prepared nanoparticles exhibit significant antibacterial properties against gram-positive Bacillus cereus and gram-negative Escherichia coli bacterial strains by agar well diffusion method.
通过电化学方法制备了聚乙二醇（PEG）封端的 ZnO 和掺钨的 PEG 封端的 ZnO 纳米粒子，研究了表面活性剂和掺杂剂对氧化锌纳米粒子性能的影响。这些纳米粒子采用 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外漫反射光谱（UV-DRS）、扫描电子显微镜（SEM）和 X 射线能谱（EDAX）进行了表征。研究了这些纳米粒子在可见光下对孔雀石绿染料的光催化降解。研究了各种反应参数（如染料浓度、催化剂浓度、pH 值和时间）的影响，以优化光降解反应。研究了这些纳米粒子的可重复使用性，PEG 封端的 ZnO 纳米粒子在第四循环之前，其降解效率没有明显变化，而掺钨的 PEG 封端的 ZnO 纳米粒子的降解效率则逐渐降低。Langmuir-Hinshelwood 动力学模型很好地描述了光降解能力，孔雀石绿的降解遵循准一级动力学。光催化研究表明，PEG 封端增加了 ZnO 的降解性能，而钨掺杂则降低了 PEG 封端的程度，对 ZnO 的降解性能产生了不利影响。通过琼脂孔扩散法，所制备的纳米粒子对革兰氏阳性菌蜡状芽孢杆菌和革兰氏阴性菌大肠杆菌表现出显著的抗菌性能。
