Potassium-doped graphene for simultaneous determination of nitrite and sulfite in polluted water
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| Title: | Potassium-doped graphene for simultaneous determination of nitrite and sulfite in polluted water |
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| Authors: | Li, Xiao-Rong1, Liu, Jing1, Kong, Fen-Ying1, Liu, Xin-Chun2 xcliu@gucas.ac.cn, Xu, Jing-Juan1 xujj@nju.edu.cn, Chen, Hong-Yuan1 |
| Source: | Electrochemistry Communications. Jul2012, Vol. 20, p109-112. 4p. |
| Subjects: | Potassium compounds, Semiconductor doping, Water pollution, Carbon electrodes, Graphene, Electric properties of metals, Nitrites |
| Abstract: | Abstract: Potassium (K) doping plays a critical role in adjusting the electronic properties of carbon materials. In this work, K-doped graphene, as a new electrode material, was used to modify glassy carbon electrode (GCE) for the simultaneous determination of nitrite (NO2 −) and sulfite (SO3 2−) under neutral conditions. The advantages of K-doped graphene/GCE are illustrated from comparison with the graphene/GCE, K-doped multi-walled carbon nanotubes (MWNTs)/GCE, MWNTs/GCE, graphite/GCE and bare/GCE for electrocatalytic and sensing applications. It exhibited a linear response over the concentration range from 0.5μM to 3.9mM, with a detection limit of 0.2μM (S/N=3) for NO2 − and a corresponding linear range of 2.5μM to 10.3mM, with a detection limit of 1.0μM (S/N=3) for SO3 2−. The proposed sensor could be successfully applied in the simultaneous detection of residual NO2 − and SO3 2− in polluted water accurately and precisely. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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