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Alumina (Al2O3) and its elaborated composite, Hexadecyl Tri Methyl Ammonium Bromide/Al2O3 (HDTMA/Al2O3), were used as adsorbents for removal of ortho-nitrophenol (ONP) from aqueous solution. The adsorbents were characterized by means of FTIR, B.E.T, XRD, and TEM analysis. Adsorption experiments were conducted in a batch system as a function of ONP concentration (4×10−4M), contact time and temperature...