Determination of Iodide via Direct Fluorescence Quenching at Nitrogen-Doped Carbon Quantum Dot Fluorophores
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- 作者：Haimin Zhang ; Yibing Li ; Xiaolu Liu ; Porun Liu ; Yun Wang ; Taicheng An ; Huagui Yang ; Dengwei Jing ; Huijun Zhao
- 刊名：Environmental Science & Technology Letters
- 出版年：2014
- 出版时间：January 14, 2014
- 年：2014
- 卷：1
- 期：1
- 页码：87-91
- 全文大小：345K
文摘
The development of analytical methods for rapidly, sensitively, and selectively detecting iodide (I鈥?/sup>) in aqueous media is critically important because I鈥?/sup> is closely related to human health because of a number of diseases caused by the deficiency and radioactivity of I鈥?/sup>. In this work, we describe N-doped carbon quantum dots as the fluorophores for the direct determination of I鈥?/sup> fluorescence, achieving a detection limit of 10 渭M with an analytical linear range up to 2.0 mM. The experimental results also demonstrate that the N-doped carbon quantum dot fluorophores possess high selectivity for I鈥?/sup> detection. The presence of nitrogen functional groups results in a positively charged carbon quantum dot surface, which is advantageous for the detection of I鈥?/sup> fluorescence because of the strong electrostatic interaction between carbon quantum dots and I鈥?/sup>. This work demonstrates the possibility of developing carbon quantum dot fluorophore-based fluorescence methods for the determination of other anions.