Hydrogeochemistry Department, Desert Research Center, Cairo, Egypt.
Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
Environ Sci Pollut Res Int. 2023 Jun;30(26):69514-69532. doi: 10.1007/s11356-023-27090-2. Epub 2023 May 4.
The present work focuses on the photocatalytic degradation of methylene blue (MB) on erbium ion (Er) doped TiO under visible light. Pure TiO nanoparticles and erbium (Er) doped TiO nanocomposite (Er/TiO) NCs were synthesized using the sol-gel method. The synthesized (Er/TiO) NCs were characterized using Fourier transform infrared spectroscopy (FTIR), high resolution scanning electron microscopy (HR-SEM), elementary dispersive X-ray (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectra (XPS), specific surface area (BET), zeta potential, and particle size. Different parameters were used to study their efficiency for the photoreactor (PR) and the synthesized catalyst. These parameters include pH of the feed solution, the rate of flow, the presence of an oxidizing agent (aeration pump), different ratios of nanoparticles, the amount of catalyst, and the concentrations of pollutants. An example of an organic contaminant was the dye methylene blue (MB). The result achieved using the synthesized nanoparticles (I) under ultraviolet light pure TiO was found to have degraded by 85%. For (Er/TiO) NCs under visible light, dye removal increased with pH to a maximum of 77% degradation at pH 5. Furthermore, photocatalytic efficiency improves to 80% at 40 rpm (3 l/h) low motor speed. The degradation efficiency decreased to 70% when the MB concentration was increased from 5 to 30 mg/L. When oxygen content was increased using an air pump, and deterioration reached 85% under visible light, it improved performance.
本工作重点研究了铒离子（Er）掺杂 TiO 在可见光下光催化降解亚甲基蓝（MB）。采用溶胶-凝胶法合成了纯 TiO 纳米粒子和铒（Er）掺杂 TiO 纳米复合材料（Er/TiO）NCs。用傅里叶变换红外光谱（FTIR）、高分辨率扫描电子显微镜（HR-SEM）、元素分散 X 射线（EDX）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）、比表面积（BET）、Zeta 电位和粒径对合成的（Er/TiO）NCs 进行了表征。使用不同的参数来研究它们对光反应器（PR）和合成催化剂的效率。这些参数包括进料溶液的 pH 值、流速、氧化剂（曝气泵）的存在、纳米粒子的不同比例、催化剂的用量以及污染物的浓度。有机污染物的一个例子是染料亚甲基蓝（MB）。在纯 TiO 下使用合成纳米粒子（I）在紫外光下的结果发现，降解率达到 85%。对于可见光下的（Er/TiO）NCs，随着 pH 值的增加，染料去除率增加到最大 77%，在 pH 值为 5 时降解率最高。此外，在低电机速度 40rpm（3l/h）时，光催化效率提高到 80%。当 MB 浓度从 5mg/L 增加到 30mg/L 时，降解效率下降到 70%。当使用气泵增加氧气含量时，在可见光下恶化达到 85%时，性能得到提高。
