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首页> 外文期刊>RSC Advances >Pyrene nanoparticles as a novel FRET probe for detection of rhodamine 6G: spectroscopic ruler for textile effluent
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Pyrene nanoparticles as a novel FRET probe for detection of rhodamine 6G: spectroscopic ruler for textile effluent

机译：nanoparticles纳米粒子作为新型FRET探针检测罗丹明6G：纺织废水的光谱尺

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摘要

An aqueous suspension of pyrene nanoparticles (PyNPs) stabilized by sodium lauryl sulfate exhibit red shifted aggregation induced enhanced emission (AIEE) in the spectral region where Rhodamine 6G (R6G) absorbs strongly. Dynamic light scattering results of the aqueous suspension show a narrow particle size distribution with an average size of 38 nm and the zeta potential of -22 mV predicted a high degree of stability and surface charge modification of the nanoparticles. The negative zeta potential allowed cationic R6G to adsorb on the oppositely charged surface of the nanoparticles and both the molecules bind within the close distance required for efficient fluorescence resonance energy transfer (FRET) to take place from PyNPs to R6G. Systematic FRET experiments performed by measuring quenching of fluorescence of PyNPs with successive addition of R6G solution exploited the use of the PyNPs as a novel probe first time for the detection and estimation of R6G from textile effluents with a Limit of Detection (LOD) equal to 8.905 x 10(-6) mol L-1 by fluorimetric measurements. The quenching results obtained at different constant temperatures were found to fit the well-known Stern-Volmer relation and were used further to estimate photokinetic and thermodynamic parameters such as quenching rate constant, enthalpy change (Delta H), Gibbs free energy change (Delta G) and entropy change (Delta S). The mechanism of binding and quenching of fluorescence of PyNPs by R6G is proposed based on the thermodynamic parameter, the energy transfer efficiency, critical energy transfer distance (R-0) and distance of approach between donor-acceptor molecules (r). The fluorescence quenching results are used further to develop analytical methods for estimation of R6G from industrial textile effluents.
机译：由月桂基硫酸钠稳定的pyr纳米颗粒（PyNPs）的水悬浮液在若丹明6G（R6G）吸收强烈的光谱区域显示出红移聚集诱导的增强发射（AIEE）。水性悬浮液的动态光散射结果显示出窄的粒径分布，平均粒径为38 nm，ζ电位为-22 mV，预示了纳米颗粒的高度稳定性和表面电荷改性。负Zeta电位使阳离子R6G吸附在纳米粒子带相反电荷的表面上，并且两个分子都在有效的荧光共振能量转移（FRET）从PyNP到R6G发生所需的近距离内结合。通过连续添加R6G溶液来测量PyNPs的荧光猝灭进行的系统性FRET实验首次利用PyNPs作为一种新型探针从纺织品废水中检测和评估R6G，其检出限（LOD）等于8.905通过荧光测量得到10 x（-6）mol L-1。发现在不同的恒定温度下获得的猝灭结果符合众所周知的斯特恩-沃尔默关系，并被用于进一步估算光动力学和热力学参数，例如猝灭速率常数，焓变（ΔH），吉布斯自由能变化（ΔG）。 ）和熵变化（ΔS）。基于热力学参数，能量传递效率，临界能量传递距离（R-0）和供体-受体分子之间的接近距离（r），提出了R6G与PyNPs结合并猝灭荧光的机理。荧光猝灭结果进一步用于开发分析方法，以估算工业纺织品废水中的R6G。

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