期刊
CHEMICAL ENGINEERING JOURNAL
卷 307, 期 -, 页码 476-486出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.08.117
关键词
Mg/Al layered double hydroxides; Glycerin; Methyl orange; Interaction mechanism
资金
- NSFC [91326202, 21577032, 21225730, 21375148]
- Fundamental Research Funds for the Central Universities [JB2015001, JB2016166]
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection
- Priority Academic Program Development of Jiangsu Higher Education Institutions
The uncalcined glycerol-modified nanocrystallined Mg/AI layered double hydroxides (named as G-LDH) and calcined G-LDH (named as G-LDO) with molar ratio of Mg:Al = 3:1 were successfully synthesized using an easy and green hydrothermal method, and were characterized by scanning electron microscopy, transmission electron microscopy, N-2 Brunauer-Emmett-Teller surface area measurement, Fourier transformed infrared (FT-IR) spectroscopy and X-ray diffraction (XRD). The as-synthesized G-LDH and G-LDO were applied as adsorbents to remove methyl orange (MO) from aqueous solutions at different experimental conditions, and the results showed that the interaction of MO with G-LDH and G-LDO were strongly pH-dependent and ionic strength-independent. Kinetic study indicated the MO adsorption on G-LDH and G-LDO were well simulated by pseudo-second-order model. The MO adsorption on G-LDH and G-LDO were well simulated by Langmuir model, and the maximum adsorption capacity of G-LDO (q(max) = 1062.3 mg/g) was much higher than that of G-LDH (q(max) = 443.5 mg/g) at pH = 4.5. The thermodynamic parameters calculated from temperature-dependent isotherms indicated that the adsorption was spontaneous and exothermal process. The FT-IR and XRD analysis further evidenced that the interaction of MO with G-LDH was mainly dominated by electrostatic interaction, ion exchange, hydrogen bonding and surface complexation, whereas the uptake of MO to G-LDO was mainly attributed to electrostatic interaction and surface complexation. These results suggested that the G-LDO was a promising material for the efficient removal of organic pollutants in real environmental pollution cleanup. (C) 2016 Elsevier B.V. All rights reserved.
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