Muna A. Al-Kazragi, Dhafir T.A. Al-Heetimi, Omar S.A. Al-Khazrajy
Abstract
Sorption is a key factor in removal of organic and inorganic contaminants from their aqueous solutions.
In this study, we investigated the removal of Xylenol Orange tetrasodium salt (XOTS) from its
aqueous solution by Bauxite (BXT) and cationic surfactant hexadecyltrimethyl ammonium bromide
modified Bauxite (BXT-HDTMA) in batch experiments. The BXT and BXT-HDTMA were characterized
using FTIR, and SEM techniques. Adsorption studies were performed at various parameters i.e.
temperature, contact time, adsorbent weight, and pH. The modified BXT showed better maximum
removal efficiency (98.6% at pH = 9.03) compared to natural Bauxite (75% at pH 2.27), suggesting that
BXT-HDTMA is an excellent adsorbent for the removal of XOTS from water. The equilibrium data of
XOTS adsorption on BXT and BXT-HDTMA surfaces were best fitted with the Freundlich isotherm
model. The pseudo-second-order model provided very good fitting for the dye on the two surfaces.
The error function, the sum of the absolute errors (SAE), was calculated to identify the best isotherm
in this study. The thermodynamic parameters like ΔHº, ΔSº and ΔGº were also calculated. The adsorbent
dosage weight and pH were found the most factors influencing the removal process
Publication Date
12/4/2019
Publisher
Desalination and Water Treatment
Volume No
Issue No
DOI
10.5004/dwt.2019.23609
Pages
1-9
Keywords
Anionic dye; Cationic surfactant; Iraqi Bauxite mineral clay; Thermodynamic parameters
منى عبد الرسول الخزرجي | muna al kazragi | 4376