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The Performance of Tio2 /Nay-Zeolite Nanocomposite in Photocatalytic Degradation of Microcystin-Lr From Aqueous Solutions: Optimization by Response Surface Methodology (Rsm) Publisher



Ebrahimi A1 ; Jafari N1 ; Ebrahimpour K1 ; Nikoonahad A2 ; Mohammadi A3 ; Fanaei F4 ; Abdolahnejad A3
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Department of Environmental Health Engineering, Faculty of Health, Ilam University of Medical Sciences, Ilam, Iran
  3. 3. Department of Public Health, Maragheh University of Medical Sciences, Maragheh, Iran
  4. 4. Department of Environmental Health Engineering, Faculty of Health, Iran University of Medical Sciences, Tehran, Iran

Source: Environmental Health Engineering and Management Published:2020


Abstract

Background: Microcystin (MC) is a hepatotoxic and carcinogenic toxin that is generated by cyanotoxins which can have adverse effects on the human health. Therefore, it is very important to remove it from the environment. This study was performed to investigate the efficiency of titanium dioxide (TiO2 )/ NaY-zeolite (T/N-Z) nanocomposite for removal of MC-LR under ultraviolet light. Methods: In the present study, T/N-Z nanocomposite was synthesized using the hydrothermal method. Specification of the photocatalysts was determined by the field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) spectra. The response surface methodology (RSM) was used to survey the effects of operating variables such as pH, contact time, and catalyst dose on the removal of MC-LR. The MC-LR concentration was measured by high-performance liquid chromatography (HPLC). Results: It was revealed that the increase of contact time and catalyst dose had a positive effect on enhancing the removal efficiency of MC-LR, but pH had a negative effect. Finally, the maximum MCLR removal efficiency was 97.63%, which occurred at pH = 5, contact time = 120 min, and catalyst dose = 1.2 g/L. Conclusion: In general, T/N-Z composite in aqueous solutions under the UV light can easily decompose MC-LR and it can also be proposed as an efficient composite for removal of MC-LR from contaminated water. © 2020 The Author(s). Published by Kerman University of Medical Sciences.
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