Amino and thiol modified magnetic multi-walled carbon nanotubes for the simultaneous removal of lead, zinc, and phenol from aqueous solutions
| Autor: | Chuantong Li, Zongshu Zou, Fengman Shen, Li Shujun, Xingang Hou, Jiang Lili, Haitao Yu, Xiayan Yao |
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| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Metal ions in aqueous solution Inorganic chemistry General Physics and Astronomy Infrared spectroscopy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry Carbon nanotube Zinc 010501 environmental sciences 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surfaces Coatings and Films law.invention chemistry.chemical_compound Adsorption chemistry X-ray photoelectron spectroscopy law Phenol 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Applied Surface Science. 369:398-413 |
| ISSN: | 0169-4332 |
| Popis: | The novel functionalization of multi-walled carbon nanotubes (MWCNTs) was synthesized by reacting trimethoxysilylpropanethiol (MPTs), hydrazine, ammonium ferrous sulfate, and ammonium ferric sulfate in sequence as efficient ways to introduce Fe 3 O 4 , amino and thiol groups onto the nanotubes sidewalls. The magnetic MWCNTs composite material (N 2 H 4 –SH–Fe 3 O 4 /o-MWCNTs) was characterized by transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, thermo-gravimetric analysis, x-ray photoelectron spectroscopy, Fourier transformation infrared spectroscopy and magnetization curve. The results revealed that MPTs and hydrazine were coated on the surface of N 2 H 4 –SH–Fe 3 O 4 /o-MWCNTs. A series of batch adsorption experiments were conducted to study the experimental conditions, such as pH, contact time, initial concentrations and temperatures, which affected the adsorption process. The adsorption experiment results showed that the maximum equilibrium adsorption capacity of N 2 H 4 –SH–Fe 3 O 4 /o-MWCNTs for lead, zinc and phenol was 195.81 mg/g, 169.89 mg/g and 38.97 mg/g at pH 6, respectively. The adsorption isotherm was better fitted by the Freundlich model, and the adsorption kinetics was consistent with pseudo-second order kinetics model. Furthermore, thermodynamic data showed that the adsorption process was spontaneous and exothermic. These results indicated that N 2 H 4 –SH–Fe 3 O 4 /o-MWCNTs may be promising surface modified materials for removing heavy metal ions and phenol from aqueous solutions. |
| Databáze: | OpenAIRE |
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