Articles
  • Physical properties and antioxidant activity of ZnO nanoparticles synthesized by Moringa oleifera leaf extract at different pH values

  • Iwan Sugihartonoa,*, Ridha Octa Alhuriyyah Azzahraa, Nurfina Yudasarib, Esmar Budia, Riser Fahdirana, Widyaningrum Indrasaria, Tan Swee Tiamc, Rahmat Setiawan Moharb, Isnaenib, Djoko Triyonod, Fera Kurniadewie and Agus Setyo Budia

  • aProgram Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jalan Rawamangun Muka no. 01, Jakarta Timur, 13220, Indonesia.
    bNational Research and Innovation Agency, KST BJ Habibie, South Tangerang, 15314 Indonesia
    cSchool of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan 43900, Malaysia
    dDepartemen Fisika, FMIPA, Universitas Indonesia, Kampus Baru UI, Depok, 16424, Indonesia
    eProgram Studi Kimia, FMIPA, Universitas Negeri Jakarta, Jalan Rawamangun Muka no. 01, Jakarta Timur, 13220, Indonesia.

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have demonstrated green synthesis of ZnO nanoparticles using Moringa oleifera leaves (Mor-ZnO NPs) extract by co-precipitation method under 450oC for 2 hours with different pH-5, pH-7, and pH-8. The physical properties (i.e. structural, morphology, and absorbance) have been analyzed using X-ray diffraction (XRD) measurement, scanning electron microscopy (SEM), and ultraviolet-visible (UV-Vis) spectrophotometer. Furthermore, to investigate the functional group and antioxidant activity we performed Fourier transform infra-red (FTIR) analysis and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Structurally, all samples possess polycrystalline hexagonal wurtzite structure. Morphologically, the pH values affect the morphology of Mor-ZnO NPs. Optically, the Mor-ZnO NPs with pH-8 have strong absorption in the range of short ultraviolet (200-280 nm). We predict that the basic pH value on green synthesize of Mor-ZnO NPs tune the near band edge absorption (NBA), which relates to the recombination of the free excitons. Whereas, based on the FTIR spectra analysis, the Zn-O stretching can be identified at 442.67 cm-1, 458.67 cm-1, and 442.67 cm-1 for Mor-ZnO NPs with the pH-5, pH-7, and pH-8, respectively. According to DPPH assay, the Mor-ZnO NPs with pH-8 at 200 mg/ml has higher inhibition rate (67.7%). Hence, we believed that the Mor-ZnO NPs are potential antioxidants.


Keywords: Green-synthesis, Mor-ZnO NPs, pH, Physical properties, Antioxidants.

This Article

  • 2024; 25(4): 557-562

    Published on Aug 31, 2024

  • 10.36410/jcpr.2024.25.4.557
  • Received on Apr 8, 2024
  • Revised on Jun 14, 2024
  • Accepted on Jun 14, 2024

Correspondence to

  • Iwan Sugihartono

  • Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jalan Rawamangun Muka no. 01, Jakarta Timur, 13220, Indonesia.
    Tel : +62-021-4890856 Fax: +62-021-4890856

  • E-mail: iwan-sugihartono@unj.ac.id