聚苯胺/银纳米粒子/氧化石墨烯纳米复合材料荧光传感器用于识别六价铬离子。

Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions.

机构信息

Department of Materials Science, Institute of Graduate Studies and Research, Alexandria University, P.O. Box 832, Alexandria, Egypt.

Department of Environmental Studies, Institute of Graduate Studies and Research, Alexandria University, P.O. Box 832, Alexandria, Egypt.

出版信息

Sci Rep. 2020 Aug 12;10(1):13617. doi: 10.1038/s41598-020-70678-8.

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 (~ 6 µg/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.

选择测定有毒的六价铬（Cr(VI)）是非常重要的，因为它对健康和环境有巨大的负面影响。最近，发展了具有高灵敏度、快速和成本效益的荧光传感器用于 Cr(VI)。基于掺杂聚苯胺（PANI）、2-丙烯酰胺基-2-甲基丙磺酸（AMPSA）封端的银纳米粒子（NPs）和氧化石墨烯量子点（GO QDs），通过原位反应合成了一种荧光纳米复合材料（NC），用于基于发光猝灭的 Cr(VI)离子的高选择性传感，范围从 0.01 到 7.5 mg/L。该 NC 在 348 nm 处显示出发射峰，线性范围为 0.01 到 0.05 mg/L，检测限（LOD）低至 0.0065 mg/L（~6 μg/L）。PANI/Ag（AMPSA）GO QDs NC 对 Cr(VI)具有高选择性，优于其他常见金属离子。值得注意的是，PANI/Ag（AMPSA）GO QDs NC 可用于区分溶液中的 Cr(VI)和 Cr(III)。还证实了实际地表水样品中 Cr(VI)的灵敏测定，并表现出 95.3-99.2%的回收率。这种 NC 将成为一类新的荧光材料，可适用于实际应用。