Abstract The red-emission carbon dots (RCDs) were facile synthesized by the solvothermal method to construct a visual and ratiometric fluorescent probe towards Al3+ in combined with quercetin (QCT). With the increasing concentration of Al3+ (cAl3+), the red fluorescence (605 nm) of the RCDs–QCT system under 360 nm excitation was stable, and meanwhile a green fluorescence (506 nm) appeared and gradually enhanced because of the continuous formation of QCT–Al3+ complex. The red fluorescence served as the reference signal and the green as the reporter, and then a visual and ratiometric fluorescent probe towards Al3+ was established based on the variation of the ratio of fluorescence intensities at 506 and 605 nm (I506/I605) and the change of fluorescence color from red to yellow green. On account of the linear relationship between the I506/I605 value and cAl3+, the detection range and limit of detection were determined to be 0–35 μM and 90 nM, respectively. The above Al3+ probe not only exhibited the high selectivity, sensitivity and anti-interface ability, but also realized the quantitative determination of Al3+ in ultrapure and tap samples with satisfactory results, reflecting its great application potential for practical fluorescent determination of Al3+ in various aqueous environments.

中文翻译：

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通过红色发射碳点-槲皮素系统目视和比例荧光测定 Al3+

摘要 通过溶剂热法合成了红光碳点（RCDs），构建了一种针对Al3+结合槲皮素（QCT）的视觉和比例荧光探针。随着Al3+（cAl3+）浓度的增加，RCDs-QCT体系在360 nm激发下的红色荧光（605 nm）稳定，同时由于QCT的不断形成，出现绿色荧光（506 nm）并逐渐增强–Al3+ 复合物。以红色荧光为参比信号，绿色为报告信号，然后根据 506 和 605 nm 处荧光强度比值（I506/I605）的变化和变化，建立了对 Al3+ 的视觉和比例荧光探针。荧光颜色从红色到黄绿色。由于 I506/I605 值与 cAl3+ 之间的线性关系，检测范围和检测限分别确定为 0-35 μM 和 90 nM。上述Al3+探针不仅表现出较高的选择性、灵敏度和抗界面能力，而且实现了超纯样品和轻敲样品中Al3+的定量测定，结果令人满意，体现了其在各种水环境中实际荧光测定Al3+的巨大应用潜力.