TY - JOUR
T1 - Preparation, characterization and application of a CTAB-modified nanoclay for the adsorption of an herbicide from aqueous solutions
T2 - Kinetic and equilibrium studies
AU - Shirzad-Siboni, Mehdi
AU - Khataee, Alireza
AU - Hassani, Aydin
AU - Karaca, Semra
N1 - Publisher Copyright:
© 2014 Académie des sciences
PY - 2015/2/1
Y1 - 2015/2/1
N2 - In this study, surfactant-modified pillared montmorillonites (MMT) were prepared using cetyltrimethylammonium bromide (CTAB) by the intercalation method and used as adsorbent to remove bentazon from aqueous solutions. The main compositions of MMT and CTAB/MMT were characterized by Fourier transform–infrared spectroscopy (FT–IR), X-ray diffraction (XRD), scanning electron micrography (SEM) and energy dispersive X-ray (EDX) spectroscopy. The removal efficiency of bentazon was studied as a function of adsorbent dosage, pH, initial bentazon concentration and ionic strength (sodium carbonate, sodium bicarbonate, sodium sulfate and sodium chloride). The removal efficiency of bentazon by CTAB/MMT was more than that of MMT in similar conditions. By increasing adsorbent dosage and initial bentazon concentration, the removal efficiency was increased and declined, respectively. The results showed that the maximum adsorption of organo-modified montmorillonite was obtained at pH 3. The maximum adsorption capacity was estimated to be 500 mg/g at pH 3 and room temperature. The study of the adsorption kinetic model revealed that the pseudo-second order model was the best applicable one to describe the adsorption of bentazon onto CTAB/MMT. Adsorption data were analyzed by both Langmuir and Freundlich adsorption isotherms and the results showed that it was better described by the Langmuir model. The adsorption capacities of the samples were found to increase with Na2CO3 anion saturation, while they decreased in the presence of NaHCO3, Na2SO4 and NaCl.
AB - In this study, surfactant-modified pillared montmorillonites (MMT) were prepared using cetyltrimethylammonium bromide (CTAB) by the intercalation method and used as adsorbent to remove bentazon from aqueous solutions. The main compositions of MMT and CTAB/MMT were characterized by Fourier transform–infrared spectroscopy (FT–IR), X-ray diffraction (XRD), scanning electron micrography (SEM) and energy dispersive X-ray (EDX) spectroscopy. The removal efficiency of bentazon was studied as a function of adsorbent dosage, pH, initial bentazon concentration and ionic strength (sodium carbonate, sodium bicarbonate, sodium sulfate and sodium chloride). The removal efficiency of bentazon by CTAB/MMT was more than that of MMT in similar conditions. By increasing adsorbent dosage and initial bentazon concentration, the removal efficiency was increased and declined, respectively. The results showed that the maximum adsorption of organo-modified montmorillonite was obtained at pH 3. The maximum adsorption capacity was estimated to be 500 mg/g at pH 3 and room temperature. The study of the adsorption kinetic model revealed that the pseudo-second order model was the best applicable one to describe the adsorption of bentazon onto CTAB/MMT. Adsorption data were analyzed by both Langmuir and Freundlich adsorption isotherms and the results showed that it was better described by the Langmuir model. The adsorption capacities of the samples were found to increase with Na2CO3 anion saturation, while they decreased in the presence of NaHCO3, Na2SO4 and NaCl.
KW - Adsorption
KW - Bentazon
KW - Kinetic models
KW - Nanoclay
KW - Surfactant-modified MMT
UR - http://www.scopus.com/inward/record.url?scp=84922473854&partnerID=8YFLogxK
U2 - 10.1016/j.crci.2014.06.004
DO - 10.1016/j.crci.2014.06.004
M3 - Article
AN - SCOPUS:84922473854
SN - 1631-0748
VL - 18
SP - 204
EP - 214
JO - Comptes Rendus Chimie
JF - Comptes Rendus Chimie
IS - 2
ER -