Institute of Nano Science and Nano Technology, University of Kashan, P. O. Box 87317-51167, Kashan, Islamic Republic of Iran.
Chemistry Department, College of Science, University of Raparin, Rania, Kurdistan Region, Iraq.
Ultrason Sonochem. 2019 Nov;58:104686. doi: 10.1016/j.ultsonch.2019.104686. Epub 2019 Jul 13.
Solar photocatalytic process has been shown to be an energy effective and eco-friendly degradation of unwanted pollutants present in the industrial wastewater. The present study introduces the preparation and characterization of novel holmium vanadate (HoVO nanostructures that fully used in the photodegradation efficiency of anionic and cationic organic pollutants. HoVO synthesized via a sonochemical-assisted route and triethylenetetramine (TETA) was used as a capping and precipitation agent. The experiments were carried out under a probe as sonication source, and its power was adjusted in 30 W (9 kHz), 50 W (15 kHz) and 80 W (24 kHz) for different samples. The obtained nanostructures were characterized by surface analytical and spectral techniques includes XRD, FT-IR, SEM, TEM and UV-visible spectra measurements. The HR-SEM images reveal that HoVO exists as a spindle-shape with spherical morphology together. HR-TEM images reveal that prepared catalyst has a spherical structure with uniform particle size. The results outline 67.6% elimination of methyl violet dye within 90 min under UV light in the presence of the optimal nano-sized formulation of 24.5 nm size. The prepared photocatalyst possesses high stability and reusability without appreciable loss of catalytic activity up to three runs.
太阳能光催化过程已被证明是一种有效且环保的方法，可以降解工业废水中存在的不需要的污染物。本研究介绍了新型钬钒酸盐（HoVO）纳米结构的制备和表征，该纳米结构可充分用于阴离子和阳离子有机污染物的光降解效率。HoVO 通过超声辅助路线和三亚乙基四胺（TETA）合成，用作封端和沉淀剂。实验在探针作为超声源下进行，其功率分别调整为 30 W（9 kHz）、50 W（15 kHz）和 80 W（24 kHz），用于不同的样品。通过表面分析和光谱技术对所得纳米结构进行了表征，包括 XRD、FT-IR、SEM、TEM 和 UV-可见光谱测量。高分辨率-SEM 图像显示，HoVO 呈纺锤形和球形形态存在。高分辨率-TEM 图像显示，所制备的催化剂具有球形结构，粒径均匀。结果表明，在最佳纳米尺寸为 24.5 nm 的条件下，在 UV 光下 90 分钟内，甲基紫染料的去除率达到 67.6%。所制备的光催化剂具有高稳定性和可重复使用性，在三次运行中没有明显的催化活性损失。
