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首页> 外文期刊>RSC Advances >An ultrasonic-assisted synthesis of leather-derived luminescent graphene quantum dots: catalytic reduction and switch on-off probe for nitro-explosives
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An ultrasonic-assisted synthesis of leather-derived luminescent graphene quantum dots: catalytic reduction and switch on-off probe for nitro-explosives

机译：超声波辅助合成皮革衍生的发光石墨烯量子点：催化还原和硝基炸药接通探针

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摘要

The current research effort demonstrates the ultrasonic-assisted synthesis of highly fluorescent graphene quantum dots (GQDs) of similar to 5 nm diameter. First, acid pyrolysis with ultrasonic hydrothermal co-cutting breaks down the coarse graphite into nanometric graphene sheets (GS) and graphene oxide sheets (GOS) with oxygen-rich functionalities. These functionalities were then used to break GOS into graphene oxide nanofibers (GONFs) and graphene oxide quantum dots (GOQDs). Finally, upon reduction, GOQDs lose oxygen linkages to produce fluorescent GQDs (quantum yield up to 27%). The as-developed GQDs were characterized with detailed optical and spectral studies through UV, PL, FTIR, TEM, AFM, XPS, XRD and other techniques. Notably, the synthesized GQDs were catalytically active to serve as a ratiometric fluorescence switch on-off probe for the reduction of toxic nitrophenols. Moreover, the GQDs detected nitrophenol derivatives at lower concentrations than previously reported analytical values. During the real sample analysis of spiked industrial water and exposed soil samples, a high selectivity and sensitivity of the applied method was achieved with a recovery of 99.7% to 101.3% at spiked concentrations of 400 nM to 100 nM, respectively. The detection limit of the photoluminescent probe for paranitrophenol was as low as 10 pM.
机译：目前的研究工作证明了类似于5nm直径的高荧光石墨烯量子点（GQD）的超声波辅助合成。首先，用超声波水热切割的酸热解，用富氧官能团将粗石墨（GS）和石墨烯片（GOS）分开。然后使用这些官能团将GOS分成石墨烯氧化物纳米纤维（GONF）和石墨烯氧化物量子点（GOQDS）中。最后，在减少后，GOQDS丧失氧连以产生荧光GQD（量子产率高达27％）。通过UV，PL，FTIR，TEM，AFM，XPS，XRD和其他技术，表明性GQDS的特征在于详细的光学和光谱研究。值得注意的是，合成的GQDS催化活性以用作比率荧光开关接通探针，用于减少有毒硝基苯酚。此外，GQDS在较低浓度下检测硝基苯酚衍生物，而不是先前报告的分析值。在尖刺工业用水和暴露的土壤样品的真实样品分析期间，实现了应用方法的高选择性和灵敏度，分别以400nm至100nm的尖刺浓度的回收率恢复为99.7％至101.3％。普硝基苯酚的光致发光探针的检测极限低至10μm。

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  • 来源
    《RSC Advances》 |2020年第39期|共7页
  • 作者

    Kanwal Shamsa; Jahan Shanaz; Mansoor Farukh;

  • 作者单位

    Khwaja Fareed Univ Engn &

    Informat Technol Dept Chem Rahim Yar Khan Pakistan;

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

    Khwaja Fareed Univ Engn &

    Informat Technol Dept Chem Rahim Yar Khan Pakistan;

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  • 正文语种 eng
  • 中图分类 化学;
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