title: Removal of methyl orange from aqueous solutions through adsorption by calcium aluminate hydrates.
abstract: Methyl orange (MO) is a kind of anionic dye and widely used in industry. In this study, tricalcium aluminate hydrates (Ca-Al-LDHs) are used as an adsorbent to remove methyl orange (MO) from aqueous solutions. The resulting products were studied by X-ray diffraction (XRD), infrared spectroscopy (MIR), thermal analysis (TG-DTA) and scanning electron microscope (SEM). The XRD results indicated that the MO molecules were successfully intercalated into the tricalcium aluminate hydrates, with the basal spacing of Ca-Al-LDH expanding to 2.48 nm. The MIR spectrum for CaAl-MO-LDH shows obvious bands assigned to the N=N, N=H stretching vibrations and S=O, SO3(-) group respectively, which are considered as marks to assess MO(-) ion intercalation into the interlayers of LDH. The overall morphology of CaAl-MO-LDH displayed a "honey-comb" like structure, with the adjacent layers expanded.
authors.affiliation: Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, China; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
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, China.
authors.forename: Tianqi
authors.initials: T
authors.lastname: Wang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China. Electronic address: grqian@shu.edu.cn.
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, 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: Adsorption; Hydrates; Intercalation; Methyl orange (MO); Tricalcium aluminate (C(3)A)