期刊
KOREAN JOURNAL OF CHEMICAL ENGINEERING
卷 32, 期 9, 页码 1889-1895出版社
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-014-0395-6
关键词
Polyaniline/Multiwalled Carbon Nanotube; Hexavalent Chromium; Adsorption; Desorption
资金
- National Science Foundation of China [21107065]
- Natural Science Basic Research Plan in Shaanxi Province [2012JQ2003]
- Innovation Program of Scientific Research Group of Shaanxi Province, Xi'an [2014KCT-15]
- State Key Laboratory Program of Pollution Control and Resources Reuse, Nanjing China [PCRRF11012]
Polyaniline/multiwalled carbon nanotube (PANI-MWCNT) was prepared by bounding polyaniline on the surface of oxidized multiwalled carbon nanotube. The structure and surface properties of synthesized composites were characterized by Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM), and its adsorption capability for aqueous Cr(VI) was also studied. Characterized results showed that polyaniline was successfully anchored on the surface of MWCNT. From adsorption experiments the maximum adsorption amount of Cr(VI) onto PANI-MWCNTs was 28.25, 31.75 and 36.76 mg center dot g(aEuro'1) at 15, 25 and 35 A degrees C. Thermodynamic parameters showed that the Cr(VI) adsorption process was endothermic, spontaneous and feasible. Cr(VI) adsorption followed pseudo-second-order kinetics. Cr(VI) adsorption on the adsorbent decreases with increasing solution pH. The presence of anions in solution almost has no effect on Cr(VI) adsorption, indicating good selectivity. XPS analysis confirms that electrostatic interaction, reduction and chelation contribute to enhanced Cr(VI) removal. Cr(VI) loaded absorbent can be readily desorbed in 0.1 mol center dot L-aEuro'1 of NaOH solution, and the desorption rate was 84.12%.
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