Adsorption property of alizarin red S by NiFe2O4/polyaniline magnetic composite
| Autor: | Yao-dong Liang, Qian-qian zhu, Yu-hang Zhang, Yong Jun He |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Process Chemistry and Technology Composite number Langmuir adsorption model 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pollution Endothermic process 0104 chemical sciences symbols.namesake chemistry.chemical_compound Adsorption chemistry Polymerization Chemical engineering Ionic strength Mass transfer Polyaniline symbols Chemical Engineering (miscellaneous) 0210 nano-technology Waste Management and Disposal |
| Zdroj: | Journal of Environmental Chemical Engineering. 6:416-425 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2017.12.022 |
| Popis: | NiFe2O4/polyaniline (PANI) magnetic composite was prepared by in situ chemical oxidative polymerization of aniline in the presence of NiFe2O4 particles, where the NiFe2O4 particles were synthesized by a facile hydrothermal method. The magnetic composite was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area method and vibrating sample magnetometer (VSM) techniques. The adsorption characteristics of the NiFe2O4/PANI composite were assessed by using alizarin red S (ARS) as an adsorbate. The adsorption process was investigated as the function of ionic strength, temperature, solution pH, adsorbent dosage, contact time and initial ARS concentration. The equilibrium adsorption data fitted well to the Langmuir model and the maximum adsorption capacity was found to be 186 mg g−1 at 303 K. The remarkable adsorption capacity of ARS onto NiFe2O4/PANI was attributed to stronger π-π interaction and weak electrostatic attraction between ARS and NiFe2O4/PANI. Kinetic studies indicated that ARS adsorption followed the pseudo-second-order kinetic model. The whole adsorption process was jointly controlled by external mass transfer and intraparticle diffusion. Thermodynamic parameters (ΔG°, ΔH° and ΔS°) revealed that the adsorption of ARS on the NiFe2O4/PANI composite was a spontaneous and endothermic process. Magnetic NiFe2O4/PANI with adsorbed ARS could be regenerated using basic ethanol solution and was separable from liquid media using a magnetic field. |
| Databáze: | OpenAIRE |
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