title: Near-infrared and mid-infrared investigations of Na-dodecylbenzenesulfate intercalated into hydrocalumite chloride (CaAl-LDH-Cl).
abstract: Hydrocalumite (CaAl-LDH-Cl) belongs to layered double hydroxides (LDHs). The intercalation of Na-dodecylbenzenesulfate (SDBS) into CaAl-LDH-Cl has been investigated by X-ray diffraction (XRD), mid-infrared (MIR) spectroscopy and near-infrared (NIR) spectroscopy. The mid-infrared spectra indicated that SDBS could be intercalated into CaAl-LDH-Cl, with the same lattice structure to that of CaAl-LDH-Cl, and the interlayer distance of resultant product was expanded to 2.78 nm as confirmed by XRD. The near-infrared spectra (9200-4000 cm(-1)) showed that a special spectral range from 6200 to 5600 cm(-1) and prominent bands of CaAl-LDH-Cl intercalated with SDBS around 8300 cm(-1). This band was assigned to the second overtone of the first fundamental of C-H stretching vibrations of SDBS, and can be used to determinate the result of CaAl-LDH-Cl modified by anionic surfactants. The bands of water stretching vibrations and -OH groups shifted to higher wavenumbers when CaAl-LDH-Cl was intercalated by SDBS, and their intensity of MIR and NIR spectra became lower in intensity.
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.forename: Guangren
authors.initials: G
authors.lastname: Qian
authors.forename: Hongfei
authors.initials: H
authors.lastname: Cheng
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Huisheng
authors.initials: H
authors.lastname: Shi
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D019265:Spectroscopy, Near-Infrared; D014961:X-Ray Diffraction
chemical_list: D001557:Benzenesulfonates; D006878:Hydroxides; C001114:dodecylbenzenesulfonic acid