Mohamed Rania A, Ghazali Niveen M, Kassem L M, Elgazzar Elsayed, Mostafa Wageha A
Department of Biology, Deanship of Educational Services, Qassim University P. O. Box: 5888 Unaizah 56219 Qassim Saudi Arabia
Parasitology Department, Faculty of Veterinary Medicine, Zagazig University P. O. Box 44519 Zagazig 44516 Egypt
RSC Adv. 2022 Oct 12;12(45):29048-29062. doi: 10.1039/d2ra04823j. eCollection 2022 Oct 11.
Researchers worldwide have been looking forward to using novel ways to purify fresh water containing pollutants and disease vectors. In the current work, nanoparticles were introduced as a promising technique for cleaning water and saving human health and living organisms. The nanocomposites, MnCoO and MnCoO/CNTs, were fabricated by a cost-effective co-precipitation method. Phase and molecular structures were investigated by XRD and Raman spectroscopy. The samples exhibited polycrystalline nature of binary phase and weak crystallinity. The elemental composition was recorded by EDX spectra, revealing the purity of the nanoparticles. The surface morphology and particle distribution were described using SEM and TEM micrographs, indicating that MnCoO/CNTs are nanoflakes with a large surface area. The optical parameters include , , , , which were identified from % and % measurements, suggesting that MnCoO has a direct band gap that reduced with the CNT support. The photocatalytic activity of MnCoO/CNTs was examined for the degradation of methyl orange dye with an efficiency of ∼90.97% over 0.6 g L within 50 min under UV irradiation. In the larvicidal activity, the micrograph images revealed the impact of the nanoflake particles on the 4th instar larvae, where the enzymatic activity of esterases acetylcholinesterase, α- and β-carboxylesterase, and transaminases drastically decreased with the MnCoO/CNT ratio.
世界各地的研究人员一直期待着使用新方法来净化含有污染物和病媒的淡水。在当前的工作中，纳米颗粒被作为一种有前景的水净化技术引入，以保障人类健康和生物生存。通过具有成本效益的共沉淀法制备了纳米复合材料MnCoO和MnCoO/CNTs。通过X射线衍射（XRD）和拉曼光谱研究了相结构和分子结构。样品呈现出二元相的多晶性质且结晶度较弱。通过能量散射X射线光谱（EDX）记录元素组成，揭示了纳米颗粒的纯度。使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像描述了表面形态和颗粒分布，表明MnCoO/CNTs是具有大表面积的纳米薄片。光学参数包括 ， ， ， ，这些参数是从 %和 %测量中确定的，这表明MnCoO具有直接带隙，且随着碳纳米管（CNT）的负载而减小。在紫外光照射下，研究了MnCoO/CNTs对甲基橙染料的光催化降解活性，在50分钟内，0.6 g/L的MnCoO/CNTs对甲基橙染料的降解效率约为90.97%。在杀幼虫活性方面，显微图像揭示了纳米薄片颗粒对四龄幼虫的影响，其中酯酶、乙酰胆碱酯酶、α-和β-羧酸酯酶以及转氨酶的酶活性随着MnCoO/CNT比例的增加而急剧下降。
