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首页> 外文期刊>RSC Advances >Simple, selective detection and efficient removal of toxic lead and silver metal ions using Acid Red 94
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Simple, selective detection and efficient removal of toxic lead and silver metal ions using Acid Red 94

机译：使用酸性红94可以简单，选择性地检测并有效去除有毒的铅和银金属离子

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Toward the goal of detecting toxic elements and removing them from drinking water, we report herein the utilization of Acid Red 94 (AR94) in sensing the hazardous metal ions in water. Among the various examined metal ions (Ag ~(+) , Pb ~(2+) , K ~(+) , Mn ~(2+) , Zn ~(2+) , La ~(3+) , Hg ~(2+) , Ca ~(2+) , Cd ~(2+) , Co ~(2+) , and Ni ~(2+) ), the UV-visible absorption spectra showed high selectivity and sensitivity for toxic silver and lead metal ions in an aqueous solution. The observed absorption spectral changes and the rapid color changes confirm complex formation between AR94 and both Ag ~(+) and Pb ~(2+) metal ions. The emission measurements showed the significant fluorescence quenching of the singlet excited state of AR94 in the presence of Ag ~(+) and Pb ~(2+) metal ions suggesting the formation of an irradiative dye–metal complex under the prevailing experimental conditions. In order to remove the accumulated complexes of AR94 with silver metal ions, safe and harmless mesoporous titanium dioxide was utilized efficiently in removing the complexes with adsorption capacities of 91% at 30 minutes. These findings suggest a simple, fast and efficient method for both detecting silver in water, and removing the formed AR94–metal complexes in water. In addition, AR94 is shown to be a good sensor for the presence of Ag and Pb nanoparticles, NPs, in aqueous solution. The absorption and emission spectra of AR94 showed significant changes that may be rationalized by the strong electromagnetic coupling induced by NPs plasmonic effects. These findings render AR94 a sensitive and selective sensor and a visual indicator for the qualitative and quantitative detection of silver ions, lead ions and their nanoparticles.
机译：为了检测有毒元素并将其从饮用水中去除，我们在此报告了酸性红94（AR94）在感测水中有害金属离子中的应用。在各种检测到的金属离子中（Ag〜（+），Pb〜（2 +），K〜（+），Mn〜（2 +），Zn〜（2 +），La〜（3 +），Hg〜（ 2 +），Ca〜（2 +），Cd〜（2 +），Co〜（2+）和Ni〜（2+）），紫外可见吸收光谱显示对有毒银和铅具有高选择性和敏感性水溶液中的金属离子。观察到的吸收光谱变化和快速的颜色变化证实了AR94与Ag〜（+）和Pb〜（2+）金属离子之间形成了络合物。发射测量结果表明，在存在Ag〜（+）和Pb〜（2+）金属离子的情况下，AR94的单线态激发态发生了明显的荧光猝灭，表明在主要的实验条件下形成了辐射染料-金属配合物。为了去除AR94与银金属离子的复合物，有效安全地使用了无害的介孔二氧化钛，在30分钟时去除了91％的吸附量。这些发现提出了一种简单，快速，有效的方法，既可以检测水中的银，也可以去除水中形成的AR94-金属络合物。此外，AR94被证明是水溶液中存在Ag和Pb纳米粒子NPs的良好传感器。 AR94的吸收和发射光谱显示出明显的变化，这可以通过NPs等离子体激元效应引起的强电磁耦合来合理化。这些发现使AR94成为灵敏，选择性的传感器和可视指示器，用于定性和定量检测银离子，铅离子及其纳米颗粒。

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