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Removal of Aromatic Amines from Water by Montmorillonite‐(Cerium or Zirconium) Phosphate Crosslinked Compounds
Author(s) -
GonzálezPradas E.,
VillafrancaSánchez M.,
Del ReyBueno F.,
GarcíaRodríguez A.,
UreñaAmate M. D.
Publication year - 1999
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1999.00472425002800010013x
Subject(s) - montmorillonite , adsorption , aniline , zirconium , chemistry , inorganic chemistry , cerium , phosphate , fourier transform infrared spectroscopy , nuclear chemistry , amine gas treating , organic chemistry , chemical engineering , engineering
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.