Li Huijuan, Yao Yeting, Yang Xiaoyan, Zhou Xusheng, Lei Ran, He Sufang
Key Laboratory of State Forestry and Grassland Administration On Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China (Southwest Forestry University), Kunming, 650224, People's Republic of China.
Research Center for Analysis and Measurement, Kunming University of Science and Technology, 650093, Kunming, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Sep;29(45):68293-68305. doi: 10.1007/s11356-022-20638-8. Epub 2022 May 10.
Composites of titanium (IV) oxide combined with montmorillonite (MMT) with various TiO/MMT were prepared for photocatalysis application. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance UV-visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). The main influential factors such as the TiO/MMT dose, calcined temperature, and pH value of the solution were studied. The main intermediates of phenol degradation were determined by high performance liquid chromatography (HPLC). The results showed that the average size of TiO nanoparticles was decreased from 22.51 to 10.66 nm through the immobilization on MMT. The components in the interlayer domain were replaced by titanium pillars, and the pillaring reaction proceeded in the interlayer domain, the basic skeleton of MMT was unchanged, and TiO was dispersed on the surface of the MMT. When the initial concentration of phenol is 10 mg/L, the phenol solution pH is 6, and the UV light irradiation time is 240 min; the phenol degradation rate of 30%TiO/MMT composite is 89.8%, which is better than MMT (11.5%) and pure TiO (58.8%). It shows that TiO loaded on MMT improves its photocatalytic activity. The phenol reaction process detected by HPLC showed that it had undergone through hydroquinone and benzoquinone, and finally converted into maleic acid and carbon dioxide and small molecules. The possible photocatalysis mechanism is presented.
制备了不同TiO₂/蒙脱石（MMT）比例的二氧化钛（IV）与蒙脱石（MMT）的复合材料用于光催化应用。通过X射线衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、漫反射紫外-可见光谱和X射线光电子能谱（XPS）对制备的样品进行了表征。研究了TiO₂/MMT用量、煅烧温度和溶液pH值等主要影响因素。通过高效液相色谱（HPLC）测定了苯酚降解的主要中间产物。结果表明，通过负载在MMT上，TiO₂纳米颗粒的平均尺寸从22.51 nm减小到10.66 nm。层间域中的成分被钛柱取代，柱撑反应在层间域中进行，MMT的基本骨架未变，TiO₂分散在MMT表面。当苯酚初始浓度为10 mg/L、苯酚溶液pH值为6且紫外光照射时间为240 min时，30%TiO₂/MMT复合材料的苯酚降解率为89.8%，优于MMT（11.5%）和纯TiO₂（58.8%）。这表明负载在MMT上的TiO₂提高了其光催化活性。HPLC检测的苯酚反应过程表明，它经历了对苯二酚和苯醌，最终转化为马来酸、二氧化碳和小分子。提出了可能的光催化机理。
