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

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.

^* Corresponding author (egonzale{at}ualm.es).

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.