|
1
|
Effect of synthesis parameters on the structural, morphological characteristics, and photocatalytic activity of La2O3 nanoparticles. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
|
2
|
Ahmed HE, Iqbal Y, Aziz MH, Atif M, Batool Z, Hanif A, Yaqub N, Farooq WA, Ahmad S, Fatehmulla A, Ahmad H. Green Synthesis of CeO 2 Nanoparticles from the Abelmoschus esculentus Extract: Evaluation of Antioxidant, Anticancer, Antibacterial, and Wound-Healing Activities. Molecules 2021; 26:4659. [PMID: 34361812 PMCID: PMC8347483 DOI: 10.3390/molecules26154659] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/18/2021] [Accepted: 07/26/2021] [Indexed: 11/17/2022] Open
Abstract
Metal oxide nanoparticles synthesized by the biological method represent the most recent research in nanotechnology. This study reports the rapid and ecofriendly approach for the synthesis of CeO2 nanoparticles mediated using the Abelmoschus esculentus extract. The medicinal plant extract acts as both a reducing and stabilizing agent. The characterization of CeO2 NPs was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis), and Fourier transform infrared spectroscopy (FTIR). The in vitro cytotoxicity of green synthesized CeO2 was assessed against cervical cancerous cells (HeLa). The exposure of CeO2 to HeLa cells at 10-125 µg/mL caused a loss in cellular viability against cervical cancerous cells in a dose-dependent manner. The antibacterial activity of the CeO2 was assessed against S. aureus and K. pneumonia. A significant improvement in wound-healing progression was observed when cerium oxide nanoparticles were incorporated into the chitosan hydrogel membrane as a wound dressing.
Collapse
Affiliation(s)
- Hafiz Ejaz Ahmed
- Institute of Physics: The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan; (H.E.A.); (Z.B.)
| | - Yasir Iqbal
- Department of Physics, COMSATS University Islamabad, Lahore 54000, Pakistan;
| | | | - Muhammad Atif
- Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.A.); (N.Y.); (W.A.F.); (A.F.)
| | - Zahida Batool
- Institute of Physics: The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan; (H.E.A.); (Z.B.)
| | - Atif Hanif
- Botany and Microbiology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Nafeesah Yaqub
- Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.A.); (N.Y.); (W.A.F.); (A.F.)
| | - W. A. Farooq
- Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.A.); (N.Y.); (W.A.F.); (A.F.)
| | - Shafiq Ahmad
- Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;
| | - Amanullah Fatehmulla
- Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.A.); (N.Y.); (W.A.F.); (A.F.)
| | - Hijaz Ahmad
- Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39, 00186 Roma, Italy;
| |
Collapse
|
|
3
|
Mahvelati-Shamsabadi T, Goharshadi EK. Photostability and visible-light-driven photoactivity enhancement of hierarchical ZnS nanoparticles: The role of embedment of stable defect sites on the catalyst surface with the assistant of ultrasonic waves. ULTRASONICS SONOCHEMISTRY 2017; 34:78-89. [PMID: 27773305 DOI: 10.1016/j.ultsonch.2016.05.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 05/12/2016] [Accepted: 05/12/2016] [Indexed: 05/09/2023]
Abstract
Zinc sulfide is a UV-active photocatalyst and it undergoes photocorrosion under light irradiation. In this work, the defect sites on ZnS nanoparticles (NPs) surfaces were induced with the help of powerful ultrasonic waves. The defect sites caused (1) suppression of photocorrosion in a large extent under UV light irradiation and (2) enhancement of visible light photo activity. The photocorrosion inhibition was induced by raising valence band (VB) position through the formation of interstitial zinc and sulfur vacancy states in the ZnS band structure and weakening of oxidative capacity of hole. The enhancement of visible light photocatalytic activity may be related to the generation of more defect energy states in the ZnS band gap. Under visible light irradiation, the electron was excited from the ZnS VB to the interstitial sulfur and zinc vacancy states before injecting into the conduction band of ZnS. Therefore, we modified the band gap of ZnS so that it acts as a visible light active photocatalyst. ZnS NPs were prepared using two different classical and ultrasound methods. The prepared ZnS using ultrasound method, exhibited more outstanding photocatalytic activity for degrading reactive black 5 (RB5) under UV and sunlight irradiation in comparison with the classical method. Details of the degradation mechanism under UV light were investigated. This work provides new insights to understanding the photocorrosion stability and visible light activity of bare ZnS photocatalyst.
Collapse
Affiliation(s)
| | - E K Goharshadi
- Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91779, Iran; Center of Nano Research, Ferdowsi University of Mashhad, Mashhad 91779, Iran.
| |
Collapse
|