标题：Fabrication of Nano-Porous Hydroxyapatite Modified Electrode and Its Application for Determination of p-Chlorophenol
作者：Lin Chu;Xiaoli Zhang
作者机构：[Chu, L] School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;[ Zhang] X., School of Chemistry and Chemical Engineer 更多
来源：Journal of nanoscience and nanotechnology
关键词：Nano-Porous Hydroxyapatite Modified Electrode;P-Chlorophenol;Electrochemical Determination;Semi-Derivative Technique
摘要：Nano-porous hydroxyapatite (HAp) modified electrode was fabricated by simply electrodepositing HAp onto the glassy carbon electrode (GCE) from the electrolytes solution containing Ca(NO_3)_2 · 4H_2O and NH_4H_2PO_4, the resulting electrode (nano-HAp/GCE) was characterized with scanning electron microscopy (SEM). The electrochemical behavior of p-chlorophenol (p-CP) at nano-HAp/GCE was studied by cyclic voltammetry. The electrode displayed selective and enhanced electroanalytical response towards p-CP, obviously because p-CP is accumulated at the electrode. For the greater sensitivity, a semi-derivative technique was adopted to obtain the current signal. The results indicated that the nano-HAp/GCE exhibits substantial enhancement in electrochemical sensitivity for p-CP due to its large surface area and particular adsorbability. After accumulation of 4 min for p-CP on nano-HAp/GCE, the peak height was linearly related to the concentration of p-CP in the range of 1.0 × 10~(-8) to 1.0 × 10~(-7) mol L~(-1). The detection limit was 4.0 × 10~(-9) mol L~(-1) at 3σ level. Based on this, the modified electrode was successfully applied in water samples with low cost and high sensitivity.