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A novel AgNPs-based colorimetric sensor for rapid detection of Cu2+ or Mn2+ via pH control

机译：一种新型基于AgNPs的比色传感器，可通过pH控制快速检测Cu2 +或Mn2 +

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摘要

In this study, we propose a new silver nanoparticles (AgNPs)-based colorimetric sensor for rapid detection of Cu2+ or Mn2+ at pH 1.9 or 12.0, respectively. At pH 1.9, the AgNPs stabilized with sodium pyrophosphate (Na4P2O7) and hydroxypropylmethylcellulose (HPMC) gradually become smaller in the presence of Cu2+ resulting in a color change of the solution from yellow to colorless. At pH 12.0, however, the AgNPs aggregate immediately in the presence of Mn2+, which induces a color change of the solution from yellow to brown. The incubation time between the detection system and metal ion (Cu2+ or Mn2+) is fixed at 10 min. This mechanism is confirmed using UV-vis spectroscopy, Transmission electron microscopy (TEM), Dynamic light scattering (DLS) and Fourier-Transform Infrared Spectrometry (FT-IR). At the optimized experimental conditions, the selectivity of our AgNPs-based detection system is excellent for Cu2+ or Mn2+ compared with other metal ions. The limit of detections (LODs) of Cu2+ and Mn2+ by the naked eye are respectively 0.05 and 0.5 mu M, and those by UV-vis spectroscopy are respectively 2.0 and 20 nM. The above LODs are all lower than the corresponding national drinking water standards (16 mu M of Cu2+ and 1.8 mu M of Mn2+). The applicability of our AgNPs-based colorimetric sensor is also validated by detection of Cu2+ and Mn2+ in tap water and lake water. Therefore, these results reinforce that our AgNPs-based colorimetric sensor is applicable to rapid colorimetric detection of Cu2+ and Mn2+ in complicated real water samples with excellent selectivity and high sensitivity.
机译：在这项研究中，我们提出了一种新的基于银纳米颗粒（AgNPs）的比色传感器，分别用于快速检测pH 1.9或12.0时的Cu2 +或Mn2 +。在pH 1.9时，在有Cu2 +的情况下，用焦磷酸钠（Na4P2O7）和羟丙基甲基纤维素（HPMC）稳定的AgNPs逐渐变小，导致溶液的颜色从黄色变为无色。但是，在pH 12.0时，AgNP在Mn2 +存在时立即聚集，从而引起溶液颜色从黄色变为棕色。检测系统与金属离子（Cu2 +或Mn2 +）之间的孵育时间固定为10分钟。使用紫外可见光谱，透射电子显微镜（TEM），动态光散射（DLS）和傅里叶变换红外光谱（FT-IR）证实了这一机理。在优化的实验条件下，与其他金属离子相比，我们基于AgNPs的检测系统对Cu2 +或Mn2 +的选择性非常好。肉眼对Cu2 +和Mn2 +的检出限（LOD）分别为0.05和0.5μM，而紫外-可见光谱法分别为2.0和20 nM。以上检测限均低于相应的国家饮用水标准（16μM的Cu2 +和1.8μM的Mn2 +）。通过检测自来水和湖水中的Cu2 +和Mn2 +，也验证了基于AgNPs的比色传感器的适用性。因此，这些结果进一步证明了我们基于AgNPs的比色传感器可用于复杂比色真实水样中Cu2 +和Mn2 +的快速比色检测，具有出色的选择性和高灵敏度。

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