A Simple Device Based on Smart Hollow Microgels for Facile Detection of Trace Lead(II) Ions
A Simple Device Based on Smart Hollow Microgels for Facile Detection of Trace Lead(II) Ions
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一种基于智能中空微凝胶的简单装置，可轻松检测痕量铅（II）离子
DOI：
10.1002/cphc.201800138
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发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
Chu Liang-Yin
中科院分区：
文献类型：
--
作者：
Wang Yuan;Liu Zhuang;Peng Han-Yu;He Fan;Zhang Lei;Faraj Yousef;Wang Wei;Ju Xiao-Jie;Xie Rui;Chu Liang-Yin
开发了一种简单的装置，该装置配备有固定有离子可识别智能中空微凝胶的无纺布过滤介质，用于轻松检测痕量铅（II）离子（Pb 2+）。离子识别智能微凝胶由聚（N-异丙基丙烯酰胺-co-苯并-18-冠-6-丙烯酰胺）（PNB）制成，其中18-冠-6基团作为Pb 2+的传感器，N-异丙基丙烯酰胺基团作为致动器。PNB中空微凝胶在识别水溶液中的Pb 2+时，由于带电荷的18-冠-6/Pb2+络合基团之间的静电排斥作用和微凝胶亲水性的增强，可以从收缩状态等温转变为溶胀状态。由于PNB微凝胶的中空结构，其表现出显著的等温溶胀比。因此，通过无纺布过滤介质的溶液的通量显著降低，因为在识别Pb 2+时用于液体流动的空间显著减少。Pb 2+的浓度可以通过简单，容易地测量溶液流量的变化，使用所提出的设备，这是没有外部电源或光谱测量操作定量检测。本研究提出的策略为水环境中痕量Pb 2+的简便检测提供了一种很有前途的方法。
A simple device, which is equipped with a non‐woven fabric filter medium immobilized with ion‐recognizable smart hollow microgels, is developed for facile detection of trace lead(II) ions (Pb2+). The ion‐recognizable smart microgels are made of poly(N‐isopropylacrylamide‐co‐benzo‐18‐crown‐6‐acrylamide) (PNB), in which the 18‐crown‐6 groups act as the sensors of Pb2+and theN‐isopropylacrylamide groups act as the actuators. The PNB hollow microgels can isothermally change from a shrunk state to a swollen state in response to recognizing Pb2+in the aqueous environment due to the electrostatic repulsion among the charged 18‐crown‐6/Pb2+complex groups and the enhancement of hydrophilicity of the microgels. Due to the hollow structures, the PNB microgels show remarkable isothermal swelling ratio. Thus, the flux of solution pass through the non‐woven fabric filter medium decreases significantly because of the remarkable reduction in the space for liquid flowing upon recognizing Pb2+. The Pb2+concentration can be detected quantitatively by simply and easily measuring the change of solution flux using the proposed device, which is operated without external power supply or spectroscopic measurements. The strategy proposed in this study provides a promising method for facile detection of trace Pb2+in aqueous environments.