Acid Green 1 removal from wastewater by layered double hydroxides

Applied Water Science

Mohamed Lakraimi¹  El Hassan Elkhattabi²  Layla El Gaini²  Moha Berraho²  Radouan Hammal³  Ahmed Legrouri⁴ 

[1] Ecole Normale Supérieure, Cadi Ayyad University;Faculté des Sciences Semlalia, Cadi Ayyad University;Faculté des Sciences, Chouaib Doukkali University;International University of Grand-Bassam;

关键词: Layered double hydroxides;    Acid Green 1;    Dye;    Adsorption;    Anion exchange;   

DOI  :  10.1007/s13201-018-0658-1

来源: DOAJ

【 摘 要 】

Abstract 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.

【 授权许可】

Unknown