Adsorption of phenol from aqueous solutions by organomontmorillonite
| Autor: | Zuliang Chen, Jin Su, Hong-fu Lin, Qingping Wang, Zheng-miao Xie |
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| Rok vydání: | 2011 |
| Předmět: |
Langmuir
Aqueous solution Mechanical Engineering General Chemical Engineering Analytical chemistry Langmuir adsorption model Infrared spectroscopy General Chemistry symbols.namesake chemistry.chemical_compound Reaction rate constant Adsorption chemistry Bromide symbols General Materials Science Fourier transform infrared spectroscopy Water Science and Technology |
| Zdroj: | Desalination. 269:163-169 |
| ISSN: | 0011-9164 |
| DOI: | 10.1016/j.desal.2010.10.056 |
| Popis: | Na–montmorillonite was modified via an ion-exchange reaction with octadecyl dihydroxy ethyl methylammonium bromide (ODEM). The modified material (Na–Mt) was characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and Scanning electron microscopy (SEM). The basal spacing of the modified Na–Mt was 2.47 nm and the IR spectra of modified Na–Mt showed CH2 vibrations. The adsorption of phenol by modified Na–Mt from aqueous solution was indicative of a pseudo-second-order model which was used to calculate the corresponding rate constants (2.07 g/mg min−1 at 308 K), and the Langmuir isotherms fitted the adsorption best, giving the highest adsorption capacity (384.61 mg/g at 308 K). The calculated thermodynamic parameters suggested that the adsorption of phenol onto modified Na–Mt was physisorptive, spontaneous and exothermic in nature. |
| Databáze: | OpenAIRE |
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