title: Effective intercalation of sodium dodecylsulfate (SDS) into hydrocalumite: Mechanism discussion via near-infrared and mid-infrared investigations.
abstract: The intercalation of an anionic surfactant, sodium dodecylsulfate (SDS), into hydrocalumite (CaAl-LDH-Cl) was investigated in this study. To understand the intercalation behavior, X-ray diffraction (XRD), mid-infrared spectroscopy (MIR), near-infrared spectroscopy (NIR) and scanning electron microscopy (SEM) were undertaken. The near-infrared spectra indicated a special spectral range from 6000 to 5600 cm(-1)and prominent bands of CaAl-LDH-Cl intercalated with SDS around 8388 cm(-1). This band was assigned to the second overtone of the first fundamental of CH stretching vibrations of SDS, and it could be used to determinate the result of CaAl-LDH-Cl modified by SDS. Moreover, the results revealed that different adsorption behaviors were observed at different (high and low) concentrations of SDS. When the SDS concentration was around 0.2 mol L(-1), anion exchange intercalation occurred and the interlayer distance expanded to about 3.25 nm. When SDS concentration was 0.005 mol L(-1), the surface adsorption of DS(-) was the major anion exchange event.
authors.affiliation: Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, PR China. Electronic address: bihe0723@163.com.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, PR China.
authors.forename: Tianqi
authors.initials: T
authors.lastname: Wang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
authors.forename: Guangren
authors.initials: G
authors.lastname: Qian
authors.affiliation: Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, PR China.
authors.forename: Daishe
authors.initials: D
authors.lastname: Wu
authors.affiliation: Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
keywords: Hydrocalumite; Intercalation; Mid-infrared spectroscopy (MIR); Near-infrared spectroscopy (NIR); Sodium dodecylsulfate (SDS)