Department of Chemistry, Faculty of Science, Islamic Azad University, Rasht Branch, Rasht, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Dec;77(5):1108-14. doi: 10.1016/j.saa.2010.09.006. Epub 2010 Sep 17.
A novel photocatalytic material was synthesized by dispersion of AgBr in nanoAlMCM-41 material. The AgBr/nanoAlMCM-41 sample shows strong absorption in the visible region because of the plasmon resonance of Ag nanoparticles in AgBr/nanoAlMCM-41. The catalysts were characterized using XRD (X-ray diffraction), UV-visible diffused reflectance spectra (UV-vis DRS) and scanning electron microscopy (SEM). The photocatalytic activity and stability of the synthesized catalysts were evaluated for methylene blue (MB) degradation in aqueous solution in the presence of 200 W tungsten filament Philips lamp. Several parameters were examined, catalyst amount, pH and initial concentration of MB, AgBr loading. The effect of dosage of photocatalyst was studied in the range 0.05-1.00 g/L. It was seen that 0.1 g/L of photocatalyst is an optimum value for the dosage of photocatalyst. The support size was obtained about 9-100 nm. In the same way, the average size of AgBr nanoparticles was about 10nm before visible radiation. After visible radiation the average size of AgBr nanoparticles was about 25 nm.
通过将 AgBr 分散在纳米 AlMCM-41 材料中合成了一种新型光催化材料。AgBr/nanoAlMCM-41 样品由于 AgBr/nanoAlMCM-41 中 Ag 纳米粒子的等离子体共振，在可见区域显示出强吸收。使用 X 射线衍射 (XRD)、紫外-可见漫反射光谱 (UV-vis DRS) 和扫描电子显微镜 (SEM) 对催化剂进行了表征。在 200 W 钨丝飞利浦灯存在下，在水溶液中用亚甲基蓝 (MB) 降解评价了合成催化剂的光催化活性和稳定性。考察了几种参数，包括催化剂用量、pH 值和 MB 的初始浓度、AgBr 负载量。研究了光催化剂用量在 0.05-1.00 g/L 范围内的影响。可见，光催化剂用量为 0.1 g/L 是最佳值。载体尺寸约为 9-100nm。同样，在可见光辐射之前，AgBr 纳米粒子的平均尺寸约为 10nm。在可见光辐射后，AgBr 纳米粒子的平均尺寸约为 25nm。
