Cation-exchange strategy for a colorimetric paper sensor: Belt-like ZnSe nanoframes toward visual determination of heavy metal ions
Cation-exchange strategy for a colorimetric paper sensor: Belt-like ZnSe nanoframes toward visual determination of heavy metal ions
复制标题
比色纸传感器的阳离子交换策略：带状 ZnSe 纳米框架用于重金属离子的视觉测定
DOI：
10.1016/j.snb.2020.128013
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发表时间：
2020-06-01
影响因子：
8.4
通讯作者：
Guo, Zheng
中科院分区：
文献类型：
--
作者：
Dong, Ren-E;Kang, Ping;Guo, Zheng
基于阳离子交换原理，研制了一种用于重金属离子视觉检测的比色纸传感器。以ZnSe中心点0.5N（2）H（4）杂化纳米带为前驱体，采用水热法制备了带状ZnSe纳米框架显色剂。随着N2 H4配体的分解和释放，前驱体的规则带状纳米结构演变成由大量ZnSe纳米晶体组成的带状纳米框架。受硫族化合物的阳离子交换特性的启发，将所制备的带状ZnSe纳米框架用于重金属离子的比色纸传感器。由于组成变化引起的颜色变化，该比色纸在室温下成功地应用于检测Ag、Cu ~（2+）和Hg ~（2+）。根据颜色变化及其强度，可以单独识别Ag+ Cu 2+和Hg 2+等重金属离子，并确定其浓度。特别是对于Cu 2+，其目视检测浓度可低至1 ppm。更重要的是，所制备的比色纸传感器显示出优异的抗各种典型阳离子和阴离子的干扰性能。考虑到其成本低、实用性强，可用于实际应用。
A colorimetric paper sensor based on a cation-exchange strategy has been developed for the visual determination of heavy metal ions. Belt-like ZnSe nanoframes as colorimetric reagents were prepared from ZnSe center dot 0.5N(2)H(4) hybrid nanobelts as precursors via a hydrothermal method. With the decomposition and release of N2H4 ligands, the regular belt-like nanostructures of the precursors evolved into belt-like nanoframes, which consisted of numerous ZnSe nanocrystals. Inspired by the cation-exchange characteristic of chalcogenides, the as-prepared belt-like ZnSe nanoframes were employed to fabricate a colorimetric paper sensor for the detection of heavy metal ions. Owing to the color change arising from a composition change, the colorimetric paper was successfully applied to detect Ag Cu2+, and Hg2+ at room temperature. Depending on the color change and its intensity, heavy metal ions of Ag+ Cu2+, and Hg2+ can be individually identified and their concentrations can be determined. Particularly for Cu2+, its visually detected concentration can be down to 1 ppm. More importantly, the fabricated colorimetric paper sensor displays excellent anti-interference properties from various typical cations and anions. Considering its low cost and practicality, expectedly it can be used for practical application.