کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
150633 | 456454 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Treatment of 2,4,5-trichlorophenol by MgAl–SDBS organo-layered double hydroxides: Kinetic and equilibrium studies Treatment of 2,4,5-trichlorophenol by MgAl–SDBS organo-layered double hydroxides: Kinetic and equilibrium studies](/preview/png/150633.png)
Clay-based adsorbents were synthesized by incorporating anionic surfactants sodium dodecylbenzenesulfonate (SDBS), into calcined magnesium aluminum layered double hydroxide (MgAl–C) via ion exchange. The sample has been characterized by powder X-ray diffraction, FT-IR spectroscopy and B.E.T measurement. The result shows that SDBS adsorption on the calcined phase is enhanced by reconstruction of a matrix hydrotalcite intercalated by the dodecylbenzenesulfonate with basal spacing of 30 Å, which is larger than that of MgAl–CO3. The product which is an organophilic layered double hydroxide or organo-LDH (MgAl–SDBS) was examined for their ability to adsorb organic pollutant. The adsorption of 2,4,5-trichlorophenol (TCP) from aqueous solutions by MgAl–SDBS hydrotalcite was investigated in a batch mode. The influence of solution pH, initial TCP concentration and temperature has been tested in kinetic runs. The results showed that the kinetic adsorption could be described by a pseudo-second order model very well. The equilibrium isotherm for TCP uptake was fitted to the Langmuir model with correlation coefficient R2 of 0.998 at low concentrations and 0.992 for all concentrations. Its maximum adsorption amount is 240.5 mg/g from this model, while the real amount is 160 mg/g at 298 K and pH 4. The negative value of ΔG° and the positive value of ΔH° indicate the spontaneous and endothermic nature of the process.
► Removal of chlorophenols from water and wastewaters using low cost adsorbents.
► Development of kinetic models.
► Testing of isotherms.
► Evaluation of thermodynamic parameters.
Journal: Chemical Engineering Journal - Volume 173, Issue 1, 1 September 2011, Pages 36–41