Ultrasensitive photoelectrochemical determination of chromium(VI) in water samples by ion-imprinted/formate anion-incorporated graphitic carbon nitride nanostructured hybrid
Ultrasensitive photoelectrochemical determination of chromium(VI) in water samples by ion-imprinted/formate anion-incorporated graphitic carbon nitride nanostructured hybrid
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DOI：
10.1016/j.jhazmat.2016.03.046
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发表时间：
2016-07-15
影响因子：
13.6
通讯作者：
Gong, Jingming
中科院分区：
文献类型：
--
作者：
Fang, Tian;Yang, Xiaomin;Gong, Jingming
提出了一种在可见光照射下快速、高灵敏地测定水样中痕量铬的光电化学方法。在这里，一种独特的纳米结构的甲酸盐负离子掺杂的石墨化碳氮化物(F-g-C3N4)被巧妙地与铬(VI)离子印迹聚合物(IIP)作为光活性电极(记为IIP@F-g-C3N4)集成在一起。与g-C3N4相比，F-g-C3N4纳米杂化材料表现出增强的电荷分离和显著改善的PEC响应。新设计的IIP@F-g-C3N4 PEC传感器对六价铬具有很高的灵敏度和选择性，因为它能有效地对六价铬进行光生电子还原。本法线性范围为0.01ppb~100.00 ppb，检出限为0.006 ppb(S/氮=3)。通过将铬(III)氧化成铬(VI)，并将总铬测定为铬(VI)，我们的方法可用于测定水溶液中的铬(VI)、铬(III)和总铬含量。在实际应用中，该方法成本低、灵敏度高，已成功用于环境水样中铬的形态测定。(C)2016爱思唯尔B.V.保留所有权利。
A rapid and highly sensitive photoelectrochemical (PEC) method has been proposed for the determination of trace amounts of chromium in water samples under visible-light irradiation. Here, a unique nanostructured hybrid of formate anion incorporated graphitic carbon nitride (F-g-C3N4) is smartly integrated with a Cr(VI) ion-imprinted polymer (IIP) as a photoactive electrode (denoted as IIP@F-g-C3N4). The nanohybrid of F-g-C3N4 exhibits an enhanced charge separation with substantially improved PEC responses versus g-C3N4. The newly designed IIP@F-g-C3N4 PEC sensor exhibits high sensitivity and selectivity for the determination of Cr(VI) because it offers efficient photogenerated electron reduction toward Cr(VI). The PEC analysis is highly linear over Cr(VI) concentrations ranging from 0.01 to 100.00 ppb with a detection limit of 0.006 ppb (S/N= 3). Our approach can be used to detect Cr(VI), Cr(III) and the total chromium level in aqueous solution through oxidation of Cr(III) to Cr(VI) and the determination of the total chromium as Cr(VI). In practical applications, this low-cost and sensitive assay has been successfully applied for speciation determination of chromium in environmental water samples. (C) 2016 Elsevier B.V. All rights reserved.