Reaction Kinetics, Mechanisms and Catalysis

, Volume 128, Issue 2, pp 1127–1139 | Cite as

Efficient catalytic photodegradation of methylene blue from medical lab wastewater using MgO nanoparticles synthesized by direct precipitation method

  • Bakhtyar K. AzizEmail author
  • Mozart A. H. Karim


Methylene blue is the main component of several stains such as Wright–Giemsa and Leishman stain that are used in histology and hematology laboratories. 97.8% of methylene blue from medical laboratory wastewater were photodegraded with the aid of MgO nanoparticles as photocatalysts and direct solar irradiation as a renewable source. The rate of photodegradation was 0.0184 min−1. The direct precipitation method was used as a simple and low cost method to synthesize MgO nanoparticles in the size range of 2.5–11.3 nm as estimated from X–ray diffraction peaks. The optical band gap energy was reduced to 4.25 eV. The photoluminescence spectra of MgO nanoparticles show four bands corresponding to F and F+ oxygen vacancy defects. The effects of the operational parameters (MgO dose, initial pH, irradiation source energy, initial concentration of the dye and temperature) were evaluated on the efficiency and rate of the photodegradation. The efficiency of the synthesized MgO nanoparticles was compared with TiO2 and ZnO nanoparticles as well.


MgO nanoparticles Catalytic photodegradation Medical lab wastewater Blood film 


Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.

Supplementary material

11144_2019_1677_MOESM1_ESM.docx (336 kb)
Supplementary material 1 (DOCX 336 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.College of Medical and Applied SciencesCharmo UniversityChamchamalIraq
  2. 2.Chemistry Department, College of ScienceUniversity of SulamaniSulaimaniIraq

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