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首页> 外文期刊>Journal of Hazardous Materials >Determination of Hg~(2+) and Cu~(2+) ions by dual-emissive Ag/Au nanocluster/ carbon dots nanohybrids: Switching the selectivity by pH adjustment
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Determination of Hg~(2+) and Cu~(2+) ions by dual-emissive Ag/Au nanocluster/ carbon dots nanohybrids: Switching the selectivity by pH adjustment

机译：双发射Ag / Au纳米团簇/碳点纳米杂化物测定Hg〜（2+）和Cu〜（2+）离子：通过调节pH来切换选择性

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摘要

An innovative dual-emissive ratiometric nanohybrid probe comprised of red-emitting a (Ag/Au)@insulin nanoclusters (NCs) and blue-emitting carbon dots (CDs) was designed for sensitive and selective ratiometric determination of Hg2+ and Cu2+ ions. The fluorescence intensity of CDs (lambda(ex) = 340 nm; lambda(ex) = 420 nm) was unaffected in the presence of the metal ions tested, whereas the red emitting NCs (lambda(ex) = 340 nm; lambda(ex) = 640 nm) was strongly quenched by both Cu2+ and Hg2+ ions. Interestingly, the selectivity of the probe toward these two ions was simply switched by controlling the pH of probe solution without using any chelating agent. The probe selectively responded to Hg2+ ions at acidic condition (pH = 4.0), Cu2+ ions at basic condition (pH = 10.0), and He2+-Cu2+ mixtures at pHs within this range. The respective detection limitsfor determination of Cu2+ and Hg2+ ions at their specific pH conditions were estimated as 5 nM and 7 nM, over linear ranges of 20-600 nM and 20-2000 nM, respectively. The fabricated ratiometric probe also showed distinguished fluorescence color changes to visual detection of these ions. Finally, the probe was successfully applied to determination of Hg2+ and Cu2+ ions in tap and mineral water samples.
机译：设计了一种创新的双发射比例纳米混合探针，该探针由红色发光的（Ag / Au）@胰岛素纳米簇（NCs）和蓝色发光的碳点（CD）组成，用于灵敏和选择性的比例测定Hg2 +和Cu2 +离子。 CDs（λ（ex）= 340 nm；λ（ex）= 420 nm）的荧光强度在测试的金属离子存在下不受影响，而红色发射NCs（lambda（ex）= 340 nm; lambda（ex） ）= 640 nm）被Cu2 +和Hg2 +离子强烈淬灭。有趣的是，仅通过控制探针溶液的pH即可切换探针对这两个离子的选择性，而无需使用任何螯合剂。探针在酸性条件下（pH = 4.0）对Hg2 +离子有选择性，在碱性条件下（pH = 10.0）对Cu2 +离子有选择性，在此范围内的pH值下对He2 + -Cu2 +混合物有选择性。分别在20-600 nM和20-2000 nM的线性范围内，用于测定Cu2 +和Hg2 +离子在其特定pH条件下的检测限分别估计为5 nM和7 nM。所制造的比率式探针还显示出显着的荧光颜色变化，以可视方式检测这些离子。最终，该探针成功地用于自来水和矿泉水样品中Hg2 +和Cu2 +离子的测定。

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