Nanobiotechnology Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Tamil Nadu, India.
Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia.
Chemosphere. 2022 Sep;303(Pt 3):135177. doi: 10.1016/j.chemosphere.2022.135177. Epub 2022 May 28.
The present work highlights the preparation of double Z-scheme ZnCoO/MnO/FeS nanocomposite (NCs) and investigated its photocatalytic activity against methyl orange (MO) dye degradation under visible light. An array of techniques was carried out to characterize the nanoparticles (NPs) in order to evaluate their morphological, structural, optical, and photocatalytic properties using FE-SEM, TEM, XRD, N adsorption and desorption studies, PL, UV-visible spectrophotometer, XPS, Raman, and UV-vis DRS analysis. The degradation efficiency of NCs was tested along with different parameter studies such as different pH, NCs concentration, dye concentration, reusability and structural stability. The NCs exhibited complete photodegradation of MO dye under visible light within 80 min at pH 4. The structural and compositional stability of the prepared NCs over 6 consecutive cycles was tested via XRD and XPS analysis. The results of active species trapping experiments showed that O• and OH• are responsible for the degradation of MO dye. The TOC analysis showed 95% of mineralization by the prepared NCs. The MO dye degradation pathway was determined using GC-MS/MS analysis and drafted all the intermediates involved. End product toxicity via seed germination and intermediate toxicity study using ECOSAR software results in less toxicity of end product compared to parent compound. Finally, the genotoxicity of the prepared NCs was evaluated using Allium cepa and showed its no causes of cytotoxicity & genotoxicity by the prepared NCs. ZnCoO/MnO/FeS NCs exhibited its high photocatalytic activity and the toxicity studies confirms that there is no cause of any environmental impact.
本工作重点制备了双 Z 型 ZnCoO/MnO/FeS 纳米复合材料（NCs），并研究了其在可见光下对甲基橙（MO）染料降解的光催化活性。采用一系列技术对纳米颗粒（NPs）进行了表征，以评估其形貌、结构、光学和光催化性能，使用 FE-SEM、TEM、XRD、N 吸附和脱附研究、PL、UV-可见分光光度计、XPS、拉曼和 UV-vis DRS 分析。测试了 NCs 的降解效率，并进行了不同参数研究，如不同的 pH 值、NCs 浓度、染料浓度、可重复使用性和结构稳定性。NCs 在 pH 值为 4 下在可见光下 80 分钟内完全降解 MO 染料。通过 XRD 和 XPS 分析测试了制备的 NCs 在 6 个连续循环中的结构和组成稳定性。活性物种捕获实验的结果表明，O•和 OH•是降解 MO 染料的原因。TOC 分析表明，制备的 NCs 可将 95%的 MO 染料矿化为无机物。通过 GC-MS/MS 分析确定了 MO 染料的降解途径，并绘制了所有涉及的中间体。通过种子发芽和 ECOSAR 软件进行的中间产物毒性研究，与母体化合物相比，最终产物的毒性较低。最后，使用 Allium cepa 评估了制备的 NCs 的遗传毒性，结果表明 NCs 没有引起细胞毒性和遗传毒性。ZnCoO/MnO/FeS NCs 表现出高的光催化活性，毒性研究证实没有任何环境影响的原因。
