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Synthesis, characterization, thermal, and antibacterial activity studies on MgO powders

  • Original Paper: Sol-gel and hybrid materials for biological and health (medical) applications
  • Published:
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Abstract

In this study, MgO particles were synthesized via sol–gel technique and calcined at 600 °C for 2 h with heating rates of 2, 5, 10, and 20 °C/min, respectively, for the first time. Comprehensive characterizations were performed by TGA-DTA, XRD, SEM, Raman spectroscopy, BET analysis, photoluminescence techniques. The kinetic parameters were determined by employing four popular model-free methods: Flynn–Wall–Ozawa (FWO), Kissinger–Akahira–Sonuse (KAS), Starink, and Tang methods. MgO powders had a high crystalline structure regardless of different heating rates based on XRD results. Surface morphologies and surface areas of MgO powders did not change with heating rates. Surface morphologies of MgO powders were found to be nearly spherical with some rounded shape and exhibiting faceted edges in some regions. The specific surface area of MgO powders was found to be 5.9179, 5.6883, 3.6617, and 4.1942 m2/g with increasing heating rate, respectively. According to Raman analysis, MgO particles produced at 2 °C/min possessed higher surface defects like oxygen vacancies. The PL emission signals for MgO particles were observed at ~500 nm consisting of broad peaks, which might be attributed to oxygen defects on the surface of particles. The antibacterial performances of MgO particles were carried out against gram-negative E. coli and gram-positive B. subtilis by means of the agar disc diffusion method. MgO particles produced at a heating rate of 2 °C/min possessed the biggest inhibition zone against gram-positive B. subtilis. Having better antibacterial performances for MgO particles produced at 2 °C/min heating rate might be attributed to surface oxygen vacancies and surface area, which led to the generation of more reactive oxygen species (ROS).

Highlights

  • MgO powders were fabricated by the sol–gel process with different heating rates.

  • The effect of the heating rate on structure, morphology, and antibacterial activity was investigated.

  • Non-isothermal and thermodynamic parameters of MgO powders were studied.

  • MgO sample prepared at 2 °C/min heating rate exhibited the best antibacterial performance.

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Acknowledgements

The authors are indebted to Marmara University and Katip Çelebi University for infrastructural support.

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Authors and Affiliations

  1. Faculty of Engineering, Department of Metallurgical and Materials Engineering, Marmara University, Kadikoy, 34722, Istanbul, Turkey

    Selim Demirci, Mehmet Masum Tünçay & Arif Nihat Güllüoğlu

  2. Faculty of Engineering, Department of Chemical Engineering, Marmara University, Kadikoy, 34722, Istanbul, Turkey

    Bercem Kiran Yildirim

  3. Faculty of Engineering, Department of Materials Science and Engineering, Izmir Katip Celebi University, Çiğli, 35620, Izmir, Turkey

    Nusret Kaya

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  1. Selim Demirci
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Demirci, S., Yildirim, B.K., Tünçay, M.M. et al. Synthesis, characterization, thermal, and antibacterial activity studies on MgO powders. J Sol-Gel Sci Technol 99, 576–588 (2021). https://doi.org/10.1007/s10971-021-05609-8

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  • DOI: https://doi.org/10.1007/s10971-021-05609-8

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