Enhanced removal of methyl orange on calcined glycerol-modified nanocrystallined Mg/Al layered double hydroxides
| Autor: | Wen Yao, Jian Wang, Njud S. Alharbi, Ahmed Alsaedi, Xiangke Wang, Shujun Yu, Songsheng Lu, Tasawar Hayat, Yuejie Ai, Yidong Zou |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Ion exchange General Chemical Engineering Inorganic chemistry Layered double hydroxides Ionic bonding Langmuir adsorption model Environmental pollution 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound symbols.namesake Adsorption chemistry engineering Methyl orange symbols Environmental Chemistry 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 307:476-486 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.08.117 |
| Popis: | The uncalcined glycerol-modified nanocrystallined Mg/Al 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, N2 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 (qmax = 1062.3 mg/g) was much higher than that of G-LDH (qmax = 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. |
| Databáze: | OpenAIRE |
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