Photodegradation of olive mill effluent with hydrogel-coated Fe3O4 magnetite composite


SPONZA D. T., Oztekin R.

DESALINATION AND WATER TREATMENT, vol.57, no.6, pp.2489-2502, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 57 Issue: 6
  • Publication Date: 2016
  • Doi Number: 10.1080/19443994.2015.1033473
  • Journal Name: DESALINATION AND WATER TREATMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2489-2502
  • Keywords: Total aromatic amines, Hydrogel-coated Fe3O4 magnetite composite, H2O2, Magnetic separation process, Olive mill effluent wastewater, Photocatalytic degradation, Polyphenols, Sunlight, Ultraviolet, HEAVY-METAL IONS, REMOVAL, WATER
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this study, hydrogel-coated Fe3O4 magnetite composite was used for the photocatalytic degradation of pollutant parameters [polyphenols, chemical oxygen demand (COD) components, total aromatic amines (TAAs) ] from the olive mill effluent wastewater at different pH (4.0-7.0-9.0) conditions, at temperatures (21, 30, and 40 degrees C), at different H2O2 concentrations (50, 100, 200, and 1,000mg/l), at different retention times (15, 30, 45, and 60 min), and increasing hydrogel-coated Fe3O4 magnetite composite concentrations under 100W ultraviolet (UV) and 29W sunlights. The maximum CODtotal, polyphenols, and TAAs yields were 96%, at between 88 and 94%, and at between 83 and 94%, respectively, at 3g/l of hydrogel-coated Fe(3)O(4)magnetite nano composite concentration, at 100W UV light irradiation, at pH 4.0, after 60min retention time, respectively. At the lowest molar ratio of 1/5 in the iron(II) chloride tetrahydrate and iron(III) chloride hexahydrate to hydrogel the highest photodegradation obtained at 30 degrees C. When the molar ratio of the iron(II) chloride tetrahydrate and iron(III) chloride hexahydrate to hydrogel was 1/3 to the maximum photodegradation reached at 40 degrees C. At the higher molar ratio of 1/2, the best photodegradation yields were obtained at 40 degrees C. The maximum CODtotal, polyphenols, and TAAs yields were obtained at acidic pH, and at 50mg/l H2O2 concentration. The Fe3O4 nanoparticles exhibited high catalytic recyclability under magnetic conditions resulting in significant decrease in treatment costs.