Nitrogen-Doped Porous Carbon Derived from Metal鈥揙rganic Gel for Electrochemical Analysis of Heavy-Metal Ion

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• 作者：Lin Cui ; Jie Wu ; Huangxian Ju
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 24, 2014
• 年：2014
• 卷：6
• 期：18
• 页码：16210-16216
• 全文大小：395K
• ISSN：1944-8252

文摘

A nitrogen-doped porous carbon material (N@MOG-C) was prepared by simple pyrolysis of polypyrrole-doped Al-based metal鈥搊rganic gel (PPy@MOG) at 800 掳C. The N@MOG-C possessed a uniform three-dimensional (3-D) interconnected mesoporous structure with a high surface area of 1542.6 m² g^鈥? and a large pore volume of 0.76 cm³ g^鈥?. By using an ionic liquid (IL) to immobilize N@MOG-C on electrode surface, the N@MOG-C was further used for sensitive detection of heavy metal ion. The doping of nitrogen-endowed N@MOG-C with faster electron transfer kinetics than other carbon materials such as MOG-C, multiwalled carbon nanotubes, and graphene. The N@MOG-C-modified electrode showed a high effective area, because of the porous structure. Under optimized conditions, the N@MOG-C-based sensor could detect Cd ions present in concentrations of 0.025鈥? 渭M, with a detection limit of 2.2 nM. The mesoporous structure, fast electron transfer ability, and simple and green synthesis of N@MOG-C made it a promising electrode material for practical applications in heavy-metal-ion sensing.

Keywords:

metal鈭抩rganic frameworks; nitrogen-doped porous carbon material; chemically modified electrode; electrochemical sensor; heavy metal ion; cadmium ion