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Acta Phys. -Chim. Sin.  2012, Vol. 28 Issue (05): 1269-1274    DOI: 10.3866/PKU.WHXB201202242
PHYSICAL CHEMISTRY OF MATERIALS     
Electrochemical Indirect Measurement for the Study of Glutathione Adsorption on Multiwalled Carbon Nanotubes and Activated Carbon
TANG Jing, ZENG Qiao, CHEN Zhen-Dong, HUANG Xiang-Qian
Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China
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Abstract  Because of the chemical reaction between Cr(VI) ions and glutathione, the peak reduction current of Cr(VI) ions decreases while adding glutathione (GSH) into a K2Cr2O7/H2SO4 solution. Thus the concentration of GSH can be detected indirectly by differential pulse voltammetry (DPV) analysis. This electrochemical indirect method was used to study the adsorption of GSH on multi-walled carbon nanotubes (MWCNTs) and activated carbon (AC), and can be used to determine the equilibrium relationship between GSH adsorption and its concentration. Unlike the result obtained from the active carbon, GSH adsorption on MWCNTs agrees better with that predicted by the Freundlich equation compared to that predicted by the Langmuir equation. The morphologies of MWCNTs and activated carbon were observed with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The abundance of aggregated pores in MWCNTs is beneficial for the diffusion and adsorption of small GSH molecules, suggesting that MWCNTs could be developed as an adsorbent for small molecular substances.

Key wordsElectrochemical indirect measurement      Glutathione      MWCNTs      Activated carbon      Adsorption mechanism     
Received: 28 November 2011      Published: 24 February 2012
MSC2000:  O643  
  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (21073038, 21173048).

Corresponding Authors: TANG Jing     E-mail: jingtang@fzu.edu.cn
Cite this article:

TANG Jing, ZENG Qiao, CHEN Zhen-Dong, HUANG Xiang-Qian. Electrochemical Indirect Measurement for the Study of Glutathione Adsorption on Multiwalled Carbon Nanotubes and Activated Carbon. Acta Phys. -Chim. Sin., 2012, 28(05): 1269-1274.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201202242     OR     http://www.whxb.pku.edu.cn/Y2012/V28/I05/1269

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