Graphene oxide (GO) was chemically modified with poly(ethylene imine) (PEI) to improve its colloidal stability and was investigated as a potential adsorbent for the removal of methyl orange (MO). The synthesis of PEI-GO was verified with a Fourier transform infrared spectrometer and thermogravimetric analysis. A series of adsorption experiments were carried out to investigate the adsorption capacity of PEI-GO. Adsorption kinetics and thermodynamics studies were performed, and the thermodynamic parameters were calculated. The results showed that PEI could improve the colloidal stability of GO in aqueous solution, and the obtained PEI-GO showed a macroscopically homogeneous dispersion after more than three months. After standing for 90 days, the Brunauer–Emmett–Teller specific surface area of GO decreased from 353 to 214 m2 · g−1, while that of PEI-GO remained almost unchanged (from 432 to 413 m2 · g−1). The PEI-GO exhibited significantly faster kinetic and higher adsorption capacity for MO than GO. Moreover, PEI-GO had a good adsorption capacity in the acidic range, and the highest adsorption of MO occurred at pH = 6.0. The adsorption of MO on PEI-GO was an endothermic, spontaneous and physisorption process.
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Research Article|
July 03 2014
Poly(ethylene imine)-modified graphene oxide with improved colloidal stability and its adsorption of methyl orange Available to Purchase
Hongxi Liu;
Hongxi Liu
1Department of Light chemical engineering, Guangdong Polytechnic, Foshan, 528041, China
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Ting Wu;
Ting Wu
1Department of Light chemical engineering, Guangdong Polytechnic, Foshan, 528041, China
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Zhimin Wu;
Zhimin Wu
1Department of Light chemical engineering, Guangdong Polytechnic, Foshan, 528041, China
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Yong Zhang;
2Guangzhou Panyu Polytechnic, Guangzhou, 511483, China
E-mail: [email protected]
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Keqin Xuan;
Keqin Xuan
3Guangdong Polytechnic, Foshan, 528041, China
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Jinglin Zhang;
Jinglin Zhang
4Department of Chemistry, Jinan University, Guangzhou, 510632, China
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Shaozao Tan
Shaozao Tan
4Department of Chemistry, Jinan University, Guangzhou, 510632, China
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Water Sci Technol (2014) 70 (5): 851–857.
Article history
Received:
February 19 2014
Accepted:
June 23 2014
Citation
Hongxi Liu, Ting Wu, Zhimin Wu, Yong Zhang, Keqin Xuan, Jinglin Zhang, Shaozao Tan; Poly(ethylene imine)-modified graphene oxide with improved colloidal stability and its adsorption of methyl orange. Water Sci Technol 1 September 2014; 70 (5): 851–857. doi: https://doi.org/10.2166/wst.2014.300
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