Fenton-like processes and adsorption using iron oxide-pillared clay with magnetic properties for organic compound mitigation

Environ Sci Pollut Res Int. 2015 Jan;22(2):870-81. doi: 10.1007/s11356-014-2973-x. Epub 2014 May 10.

Abstract

In this work, a new step was added to the classic route of iron-pillared clay obtention, resulting in a material with both magnetic and oxidative properties. The saturation of the material surface intercalated with trinuclear acetate-hydroxo iron (III) nitrate in glacial acetic acid atmosphere before heat treatment promoted magnetic phase formation (FePMAG). The material was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms, scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), and X-ray photoelectron spectroscopy (XPS). FePMAG showed an increase of 0.57 nm in basal spacing which contributed to the specific surface area increase from 39.1 to 139.2 m(2)/g. The iron phase identified by XRD and XPS was maghemite, with a little presence of hematite formed by the trinuclear acetate-hydroxo iron (III) nitrate decomposition during heat treatment. In the adsorption tests, FePMAG displayed a good capacity for organic dye methylene blue (MB) removal, reaching 41 % at 150 min. Under photo-Fenton conditions, the material showed an excellent MB oxidation capacity, completely removing the color of the solution within 90 min. Identification of the oxidation products with lower molecular (m/z = 160, 220, and 369) mass was performed by electrospray ionization mass spectroscopy (ESI-MS).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Aluminum Silicates / chemistry*
  • Clay
  • Coloring Agents / chemistry
  • Coloring Agents / isolation & purification
  • Ferric Compounds / chemistry*
  • Organic Chemicals / chemistry*
  • Organic Chemicals / isolation & purification
  • Oxidation-Reduction
  • Photochemical Processes
  • Wastewater / chemistry
  • Water Pollutants, Chemical / chemistry*
  • Water Pollutants, Chemical / isolation & purification
  • Water Purification / methods*

Substances

  • Aluminum Silicates
  • Coloring Agents
  • Ferric Compounds
  • Organic Chemicals
  • Waste Water
  • Water Pollutants, Chemical
  • ferric oxide
  • Clay