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This article in JEQ

  1. Vol. 28 No. 1, p. 115-120
     
    Received: Dec 29, 1997


    * Corresponding author(s): egonzale@ualm.es
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doi:10.2134/jeq1999.00472425002800010013x

Removal of Aromatic Amines from Water by Montmorillonite-(Cerium or Zirconium) Phosphate Crosslinked Compounds

  1. E. González-Pradas *,
  2. M. Villafranca-Sánchez,
  3. F. Del Rey-Bueno,
  4. A. García-Rodríguez and
  5. M. D. Ureña-Amate
  1. Dep. of Inorganic Chemistry, Univ. of Almería, la Cañada San Urbano s/n, 04120 Almería, Spain.
    Dep. of Inorganic Chemistry, University of Granada, Campus Fuentenueva, Avda. Severo Ochoa, s/n, 18071, Granada, Spain.

Abstract

Abstract

To evaluate the potential use of two montmorillonite-(Ce or Zr) phosphate crosslinked compounds in removing organic pollutants such as aniline, p-toluidine, and p-acetylaniline from water, adsorption experiments were performed under conditions of varied temperature (288 and 308 K). Adsorption on the montmorillonite-Ce-phosphate compound was best described by a hyperbolic (H-type) isotherm, whereas for the montmoriilonite-Zr-phosphate compound, S-type isotherms were obtained for p-toluidine and aniline and L-type for p-acetylaniline. Amines adsorption increases with increasing temperature on the cerium crosslinked material, while for the zirconium-crosslinked compound, adsorption decreases as temperature increases from 288 to 308 K, possibly due to a mainly physical process. Fourier-transform infrared (FTIR) spectroscopy indicated that at the pH generated by the adsorbents, the protonated species of these amines plays an important role in the adsorption process. X-ray diffraction analysis showed that the aromatic amines are intercalated into the adsorbents. For any given amine, the cerium-montmorillonite adsorbent shows a higher capacity of adsorption compared with zirconium-montmorillonite adsorbent, so it might be reasonably used in removing aromatic amines from water.

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