Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions
Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions
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DOI：
10.1038/s41598-020-70678-8
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发表时间：
2020-08-12
影响因子：
4.6
通讯作者：
Soliman, Moataz
中科院分区：
文献类型：
--
作者：
Ebrahim, Shaker;Shokry, Azza;Soliman, Moataz
有毒六价铬(Cr(VI))的选择性测定因其对健康和环境的巨大负面影响而具有十分重要的意义。近年来，铬(VI)荧光传感器的高灵敏度、快速性和高性价比得到了发展。基于掺杂聚苯胺(PANI)、2-丙烯酰胺基-2-甲基丙磺酸(AMPSA)包覆的银纳米粒子(NPs)和氧化石墨烯(GO)量子点(QD)的原位反应，制备了一种高选择性的铬离子荧光纳米复合材料(NC)，该复合材料在348 nm处有一个发射峰，线性范围为0.01~0.05 mg/L，检测下限为0.0065 mg/L(类似于6mU/L)。与其他常见金属离子相比，PANI/Ag(AMPSA)GO量子点对铬(VI)具有较高的选择性。值得注意的是，PANI/Ag(AMPSA)GO量子点NC可用于区分溶液中的铬(VI)和铬(III)。还证实了实际地表水中铬(VI)的灵敏测定，回收率在95.3-99.2%之间。这种纳米材料将成为一类新的荧光材料，可能适合于实际应用。
Selective determination of toxic hexavalent chromium (Cr(VI)) is a stringent important due to its huge negative impact on the health and environment. Recently, the high sensitivity, rapidness, and cost-effectiveness of the fluorescent sensors for Cr(VI) have been developed. A fluorescent nanocomposite (NC) has been synthesized based on doped polyaniline (PANI), 2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped Ag nanoparticles (NPs) and graphene oxide (GO) quantum dots (QDs) via in situ reaction for highly selective sensing of Cr(VI) ions based on the luminescent quenching in the range from 0.01 to 7.5 mg/L. This NC showed an emission peak at 348 nm with a linear range from 0.01 to 0.05 mg/L and the low limit of detection (LOD) was 0.0065 mg/L (similar to 6 mu g/L). PANI/Ag (AMPSA) GO QDs NC displayed high selectivity for Cr(VI) over other common metal ions. Notably, the PANI/Ag (AMPSA) GO QDs NC can be used for distinguishing Cr(VI) and Cr(III) in solutions. The sensitive determination of Cr(VI) in real surface water samples was also confirmed and demonstrated recoveries in the range 95.3-99.2%. This NC will emerge as a new class of fluorescence materials that could be suitable for practical applications.