Citation: WANG Jia-Hong, YIN Xiao-Long, JI Yan-Fen. Cr(Ⅵ) Adsorption on Polyethyleneimine Modified Graphite Oxide[J]. Chinese Journal of Inorganic Chemistry, ;2015, (6): 1185-1193. doi: 10.11862/CJIC.2015.160 shu

Cr(Ⅵ) Adsorption on Polyethyleneimine Modified Graphite Oxide

1.
1 College of Resource and Environment, Shannxi University of Science & Technology, Xi'an 710021, China;
2.
2 State Key Laboratory of Pollution Control and Resource Reuse, and School of the Environment, Nanjing University, Nanjing 210093, China

Corresponding author: WANG Jia-Hong,
Received Date: 29 December 2014
Available Online: 13 April 2015
Fund Project: 国家自然科学基金(No.21107065) (No.21107065)污染控制与资源化国家重点实验室(南京大学)开放课题(No.PCRRF11012)资助项目。 (南京大学)开放课题(No.PCRRF11012)

Polyethyleneimine modified graphite oxide (PEI-GO) were prepared by grafting polyethyleneimine (PEI) on the surface of graphite after oxidation and esterification. The structure and surface properties of synthesized composites were characterized by Fourier-transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscope (TEM), Rraman spectroscopy (RS) and X-ray photoelectron spectroscopy (XPS) analysis, and its adsorption and desorption capability for aqueous Cr(Ⅵ) was also conducted. Characterization results indicated that polyethyleneimine has been successfully grafted on the surface of graphite oxide, and the content of the amino groups of PEI-GOis 4.36 mmol·g^-1. PEI-GOexhibits high adsorption capacity for aqueous Cr(Ⅵ). Adsorption isotherm of Cr(Ⅵ) onto PEI-GO could be described better by Freundlich model than Langmuir model. The pseudo-second-order kinetics followed the adsorption data very well. Adsorption amount of Cr(Ⅵ) onto PEI-GOdecreased with increasing pH. The presence of anions in solution resulted in the suppressed Cr(Ⅵ) adsorption, and the effect of different anions was in the order of PO₄^3- > SO₄^2- > NO₃^- > Cl^-. XPSanalysis indicates that adsorption coupled chemical reduction mechanism contributes to enhanced Cr(Ⅵ) adsorption on PEI-GO. After four successive desorption-regeneration cycles, PEI-GO still possesses high adsorption capacity for Cr(Ⅵ), which indicates that the adsorbent has good regeneration capability and can be used repeatedly.
- polyethyleneimine;modified graphite oxide;hexavalent chromium;adsorption;desorption
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