Synthesis of MnCoO/CNT nanoflakes for the photocatalytic degradation of methyl orange dye and the evaluation of their activity against Culex pipiens larvae in the purification of fresh water
Rania Ali El Hadi Mohameda b✉, Niveen M. Ghazalic, Lamyaa M. Kassemd, Elsayed Elgazzare, Wageha A. Mostafaf
- aDepartment of Biology, Deanship of Educational Services, Qassim University, P. O. Box: 5888, Unaizah 56219, Qassim, Saudi Arabia
- bParasitology Department, Faculty of Veterinary Medicine, Zagazig University, P. O. Box 44519, Zagazig 44516, Egypt
- cDepartment of Pharmaceutical Chemistry and Pharmacognozy, Unaizah College of Pharmacy, Qassim University, P. O. Box: 5888, Unaizah 51911, Qassim, Saudi Arabia
- dDepartment of Pharmacy Practice, Unaizah College of Pharmacy, Qassim University, P. O. Box: 5888, Unaizah 51911, Qassim, Saudi Arabia
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Abstract
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 α, Eg, n, k, which were identified from T% and R% 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−1 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.