Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (05): 1269-1274.doi: 10.3866/PKU.WHXB201202242


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   

  1. 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
  • Received:2011-11-28 Revised:2012-02-08 Published:2012-04-26
  • Contact: TANG Jing
  • Supported by:

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

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 words: Electrochemical indirect measurement, Glutathione, MWCNTs, Activated carbon, Adsorption mechanism