Electrocatalytic determination of free glycerol in biodiesel at nano nickel modified graphite electrode

International Journal of Nano Dimension

مقاله 11، دوره 3، شماره 3، خرداد 2013، صفحه 241-247   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.7508/ijnd.2012.03.010

نویسندگان

R. M. A. Tehrani^{* 1}؛ M.R. Allahgholi Ghasri¹؛ F. Bakhtiarzadeh¹؛ N. Tafreshi¹؛ S. Ab Ghani²

¹Department of Chemistry, Shahre Rey Branch, Islamic Azad University, 18155-144, Tehran, Iran.

²Pusat Pengajian Sains Kimia, Universiti Sains Malaysia, 11800 USM, Pulau Pinang, Malaysia.

چکیده

For the first time this study reported the success of using nanocrystalline hexagonal close-packed (hcp) nickel (Ni) modified composite graphite (CG) electrode (hcp-nano Ni/CG) for the electrocatalytic oxidation of glycerol in alkaline medium (0.1 M KOH). The hcp-nano Ni/CG electrode had an improve response and specificity on the electrocatalytic oxidation of glycerol over the bare CG. The electrocatalysis was the result of the formation of NiOOH during the oxidation process. The process was influenced by scan rate and concentration of glycerol. A linear relationship of concentration with current was obtained over concentration range of 0.5 – 12.0 mM glycerol with limit of detection (S/N = 3) at 0.033 mM glycerol. The hcp nano Ni modified CG electrode was applied for direct determination of free glycerol in biodiesel samples. As a glycerol sensor the hcp nano Ni modified CG is quite stable.  

کلیدواژه‌ها

Biodiesel؛ Electrocatalytic oxidation؛ Glycerol؛ Hexagonal close-packed؛ Nickel nanocrystals