عنوان المقالة: Adsorption of 4-Chlorophenol from Aqueous Solution onto Iraqi Bauxite and Surfactant–modified Iraqi Bauxite: Equilibrium, Kinetic, and Thermodynamic Studies
MUNA A. AL-KAZRAGI , DHAFIR T.A. AL-HEETIMI1 and TAKIALDIN A. HIMDAN
Abstract
Natural Bauxite (BXT) mineral clay was modified with a cationic surfactant (hexadecy
ltrimethy lammonium bromide (BXT-HDTMA)) and characterized with different techniques: FTIR
spectroscopy, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The
modified and natural bauxite (BXT) were used as adsorbents for the adsorption of
4-Chlorophenol (4-CP) from aqueous solutions. The adsorption study was carried out at different
conditions and parameters: contact time, pH value, adsorbent dosage and ionic strength. The
adsorption kinetic (described by a pseudo-first order and a pseudo-second order), equilibrium
experimental data (analyzed by Langmuir, Freundlich and Temkin isotherm models) and
thermodynamic parameters (change in standard free energy) (ΔG°), standard enthalpy (ΔH°),
and standard entropy (ΔS°)) were investigated and determined. Beside the advantages and
properties of BXT-HDTMA (effective and low-cost adsorbent), the adsorption study revealed that
the modification of natural bauxite (BXT) with hexadecy ltrimethy lammonium bromide has enhanced
its adsorption capacity (eight to ten times greater comparison with the natural Bauxite).
Publication Date
8/5/2017
Publisher
ORIENTAL JOURNAL OF CHEMISTRY
Volume No
33
Issue No
6
ISSN/ISBN
0970-020 X
DOI
http://dx.doi.org/10.13005/ojc/330634
Pages
2983-2991
Keywords
Adsorption, 4-Chlorophenol, Mineral clay, Natural Bauxite, Cationic surfactant
منى عبد الرسول الخزرجي | muna al kazragi | 4572