Abstract
α-PW 12O 40 3− (PW 12) supported on the surface of silica gel derivatized by 3-aminopropyl(triethoxy)silane (devoted briefly as SiNH 3PW 12) was synthesized and used as bulk modifier to fabricate a renewable three-dimensional chemically modified electrode. The electrochemical behavior of the modified electrode was characterized by cyclic voltammetry. There is an ionic bonding character between PW 12 and the surface amino groups of modified silica, which greatly improves the stability of SiNH 3PW 12-modified carbon paste electrode due to insolubility of silica gel in water. The SiNH 3PW 12 bulk-modified carbon paste electrode not only maintains the electrochemical activity of PW 12, but also exhibits remarkable advantages of renewability, as well as simple preparation and inexpensive material. The modified electrode offers an excellent and stable electrocatalytic response for the reduction of IO 3 − and hydrogen peroxide. The SiNH 3PW 12-CPE is successfully applied as an electrochemical detector to monitor IO 3 − in flow injection analysis (FIA). The catalytic peak current was found to be linear with the IO 3 − concentration in the range 5 × 10 −6 to 1 × 10 −3 mol L −1. The detection limit of the proposed method was found to be 3.1 × 10 −6 mol L −1 for IO 3 − determination.
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