Department of Chemistry, Qom Branch, Islamic Azad University, Qom, Iran.
Comb Chem High Throughput Screen. 2022;25(5):883-894. doi: 10.2174/1386207324666210301090123.
This research proposes the application of a novel photocatalyst including CoO@SiO@TiO-Ag nanocomposite with highly photocatalytic stability and core-shell structure for the removal of toxic methyl violet from aqueous solution.
The removal of toxic dyes and organic contaminants from water is an outstanding research area among the scientists. Methyl violet is a toxic cationic pollutant that has a disruptive influence on humans. In this research, with an aim to remove methyl violet from the wastewater, we developed a new photocatalyst including CoO@SiO@TiO-Ag nanocomposite as an ecofriendly and low-cost nanostructure with high photocatalytic activity in order to reduce the risks of this pollutant from aqueous media.
The CoO@SiO@TiO-Ag nanostructure was prepared via hydrothermal and sol-gel methods and the structure elucidation of the prepared photocatalyst was analyzed by different spectroscopy techniques, including XRD, FT-IR, FE-SEM, TEM, VSM and EDX.
Photodegradation of methyl violet in the presence of different structures showed that CoO@SiO@TiO-Ag possesses superior photocatalytic activity (about 98% decomposed after 40 min) compared to the previous shells and pure CoO NPs. Loadings of SiO@TiO-Ag nanocomposite over the CoO surface led to the reduction in the bandgap energy of visible light and improvement in the photocatalytic activity of Methyl Violet dye f o r the aqueous phase decomposition.
The remarkable benefits of this nanocomposite are high photocatalytic efficiency in the degradation of methyl violet (almost 100 % within 1 h), easy magnetic separation, low cost, and high chemical stability. The collected results demonstrated that the rate of degradation increased by increasing the irradiation time, while the rate of degradation decreased with increasing dye concentration.
本研究提出了一种新型光催化剂的应用，该催化剂包括 CoO@SiO@TiO-Ag 纳米复合材料，具有高的光催化稳定性和核壳结构，可用于从水溶液中去除有毒的甲基紫。
从水中去除有毒染料和有机污染物是科学家们的一个突出研究领域。甲基紫是一种有毒的阳离子污染物，对人类有破坏作用。在这项研究中，我们开发了一种新的光催化剂，包括 CoO@SiO@TiO-Ag 纳米复合材料，作为一种环保且低成本的纳米结构，具有高的光催化活性，以降低这种污染物从水介质中释放的风险。
CoO@SiO@TiO-Ag 纳米结构是通过水热和溶胶-凝胶法制备的，所制备的光催化剂的结构通过不同的光谱技术进行了分析，包括 XRD、FT-IR、FE-SEM、TEM、VSM 和 EDX。
不同结构的甲基紫光降解表明，CoO@SiO@TiO-Ag 具有比以前的壳层和纯 CoO NPs 更高的光催化活性（40 分钟后约 98%分解）。在 CoO 表面负载 SiO@TiO-Ag 纳米复合材料导致可见光带隙能量降低，提高了 CoO@SiO@TiO-Ag 对甲基紫染料在水相分解中的光催化活性。
该纳米复合材料的显著优点是在降解甲基紫方面具有高的光催化效率（在 1 小时内几乎达到 100%），易于磁分离，成本低，化学稳定性高。收集到的结果表明，降解速率随着照射时间的增加而增加，而降解速率随着染料浓度的增加而降低。
