PDF(Pubmed)
Abstract：
Titanium dioxide (TiO2) nanoparticles were prepared through Rosmarinus-officinalis leaf extracts at 90 and 200°C. In this research, the degradations of methylene blues by using TiO2 nanoparticles Sun light radiations were studied. The synthesized materials were characterized using XRDs, UV-Vis, PL, SEM, TEM, EDS and XPS. The results displayed that bio-synthesis temperatures intrude the shapes and sizes of TiO2 nanoparticles. For TiO2-90, micrographs show separable crystalline with irregular morphologies and agglomerate cubic particles. For the other TiO2-200 sample, SEM and TEM micro-imaging shows crumbly agglomerated cubic structures. The XRD shows that the intense peaks observed at angles of 25.37°, 37.19°, 47.81° and 53.89° confirming a highly crystalline oriented as (004), (200), and (105) planes respectively. The optical properties of TiO2 nanoparticles synthesized were conveyed by PL and UV-Vis. The energy band gap calculated was 3.0 eV for both samples; that indicates heating temperature didn\'t influence the band gap of the samples. The elemental composition Ti and O2 is shown by EDS and XPS. Photo-catalytic experiments discovered that TiO2-90 nanoparticles were well-organized in photo-degradations of MB, likened to TiO2-200. The great activities of TiO2-90 were because of better physicochemical characteristics associated with TiO2-200 effectively degrading MB under photo-light. Photo-degradations of dye under sunlight as plentifully obtainable energy sources by TiO2, synthesized by simpler techniques, can be hopeful to grow an eco-friendly and economical process.
摘要：
通过迷迭香叶提取物在90和200°C下制备二氧化钛（TiO2）纳米颗粒。在这项研究中,研究了使用TiO2纳米粒子太阳光辐射对亚甲基蓝的降解。使用XRD对合成的材料进行了表征，UV-Vis,PL,SEM,TEM,EDS和XPS。结果表明，生物合成温度会影响TiO2纳米颗粒的形状和尺寸。对于TiO2-90，显微照片显示可分离的晶体具有不规则的形态和团聚的立方颗粒。对于其他TiO2-200样品，SEM和TEM显微成像显示碎裂团聚的立方结构。XRD表明，在25.37°的角度观察到强烈的峰，37.19°,47.81°和53.89°确认高度结晶取向为（004），(200),和（105）平面分别。通过PL和UV-Vis传达了合成的TiO2纳米粒子的光学性质。对于两个样品计算的能带隙为3.0eV;这表明加热温度不影响样品的带隙。元素组成Ti和O2由EDS和XPS示出。光催化实验发现，TiO2-90纳米粒子在MB的光降解中组织良好，比作TiO2-200。TiO2-90的巨大活性是由于与TiO2-200相关的更好的物理化学特性在光下有效降解MB。通过更简单的技术合成的TiO2可在阳光下对染料进行光降解，作为可充分获得的能源，有希望发展一个生态友好和经济的过程。
