Photocatalytic Removal of Malachite Green Dye from Aqueous Solutions Using Halloysite–TiO2 Nanocomposite

Authors

  • Zazouli, Mohammad Ali Professor, Department of Environmental Health Engineering, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  • Babanejad, Esmaeil Assistant Professor, Department of Environmental Health Engineering, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  • Amiri-Hosseini, Soheila MSc Student in Environmental Health Engineering, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  • Gholami-Borujeni, Fathollah Associate Professor, Department of Environmental Health Engineering, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
Abstract:

 Background and purpose: Malachite green is one of the most widely used dyes in various industries, aquaculture, and fungicides. The residues have adverse effects on environmental and human health and should be removed from the effluent before discharging to the environment. The purpose of this study was to investigate the efficiency of photocatalytic process using halloysite-titanium dioxide nanocomposite in the removal of malachite green from aqueous solutions and the effect of various parameters on the process efficiency. Materials and methods: This experimental study was performed on a laboratory scale in a discontinuous system. In this process, a 15 W (UV-C) lamp of 26 mm diameter and length of 45 cm and a nanocomposite (halloysite-titanium dioxide) were used. The influence of contact time, nanocomposite dose, dye concentration, and pH of the reaction on the removal efficiency was investigated. The properties of the synthesized nanocomposite were determined by sol-gel method using XRD and SEM techniques. The concentration of malachite green was measured using a UV-VIS spectrophotometer at 619 nm. Results: The best photocatalytic dye removal efficiency (91.29%) was seen at 3 mg/l dye concentration, pH= 10, contact time= 90 min, and nanocomposite dose= 0.1 g/l. Conclusion: This study showed that photocatalytic process using nanocomposite (halloysite-titanium dioxide) is efficient in decomposing and removing malachite green.  

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Journal title

volume 31  issue 199

pages  107- 120

publication date 2021-08

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