Acid Green 1 removal from wastewater by layered double hydroxides

被引：0
作者：
El Hassan Elkhattabi
Mohamed Lakraimi
Moha Berraho
Ahmed Legrouri
Radouan Hammal
Layla El Gaini
机构：
[1] Cadi Ayyad University,Faculté des Sciences Semlalia
[2] Cadi Ayyad University,Ecole Normale Supérieure
[3] International University of Grand-Bassam,Faculté des Sciences
[4] Al Akhawayn University,undefined
[5] Chouaib Doukkali University,undefined
来源：
Applied Water Science | 2018年 / 8卷
关键词：
Layered double hydroxides; Acid Green 1; Dye; Adsorption; Anion exchange;
D O I：
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中图分类号：
学科分类号：
摘要：
The paper presents the removal of Acid Green 1 (AG1) from aqueous solutions by [Zn–Al–Cl]-layered double hydroxides (LDHs). The LDH was prepared by coprecipitation at constant pH. The affinity of this material for AG1 was studied as a function of contact time, pH of the solution, LDH dose and AG1/LDH mass ratio. It was found that 32 h are enough to reach the equilibrium with a maximum retention at pH 8 for an LDH dose of 100 mg and with an AG1/LDH mass ratio higher than 2. The adsorption isotherm is of L-type, as described by the Langmuir model. The results demonstrate that AG1 retention on LDHs occurs by adsorption on external surface when AG1/LDH mass ratio is equal or lower than 2 and by both adsorption and interlayer ion exchange for ratios higher than 2. A mechanism for the AG1 removal has been confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric–differential thermal analyses and scanning electron microscopy.
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