An anchored self-plasticizing polymer film lead ion-selective electrode based on multi-walled carbon nanotubes
A technology of multi-walled carbon nanotubes and polymer films, which is applied in the direction of material analysis, instruments, and measuring devices through electromagnetic means, can solve the problems of low detection limit, etc., and achieve low detection limit, good physical and mechanical properties, large The effect of potential stability
Active Publication Date: 2022-02-11
EAST CHINA UNIV OF SCI & TECH
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Thus, the surfactant-free MWCNT-based monolithic lead ion-selective electrode has a 4.0×10 -10 mol L -1 low detection limit
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[0024] 1. Reagents
[0025]Methyl methacrylate (MMA), butyl acrylate (BA), 2-nitrophenyl octyl ether (NPOE), lead ionophore IV, tetrahydrofuran (THF) were purchased from Sigma-Aldrich (Switzerland). Sodium [3,5-bis(trifluoromethyl)phenyl]borate (NaTFPB) was purchased from Dojindo Laboratories (Japan). Multi-walled carbon nanotubes (MWCNTs, with a purity greater than 97%, a diameter of 10-20 nm, and a length of more than 5-15 μm) were purchased from Shenzhen Nanotechnology Co., Ltd., China, without further purification and modification. Ethyl acetate, dichloromethane, 1,4-dioxane, and 2,2'-azobisisobutyronitrile (AIBN) were purchased from Titan Company (China) in analytical reagent grade and dried before use. Lead nitrate and other salts were purchased from Sigma-Aldrich. The aqueous solution was prepared by dissolving appropriate salts in fresh deionized water (deionized water, resistance 18.25 MΩ·em, Millipore, USA).
[0026] 2. Polymer Preparation
[0027] According to t...
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Abstract
The invention provides a lead ion-selective electrode based on multi-walled carbon nanotubes of solidified self-plasticizing polymer film, which is characterized in that the electrode is made of copolymer methyl methacrylate-butyl acrylate without plasticizer Ester is the membrane matrix, with multi-walled carbon nanotubes as the intermediate ion-electron conducting layer. The electrode exhibits high bulk capacitance and double-layer capacitance, and exhibits great potential stability due to the introduction of the MWCNT conducting layer. Furthermore, the MWCNT-based plasticizer-free immobilized lead ion-selective electrode showed no obvious potential shift when exposed to oxygen and carbon dioxide. The electric potential water layer test has confirmed that there is no water film between the ion selective membrane and the electronic conductor, and the fixed-type lead ion selective electrode used for the detection of lead(II) of the present invention has achieved comparable performance to most advanced methods.
Description
technical field [0001] The invention relates to the technical field of sub-ppb detection, in particular to a multi-walled carbon nanotube-based plasticizer-free fixed lead ion selective electrode with a sub-ppb detection limit. Background technique [0002] Potentiometric methods based on ion-selective electrodes (ISEs) have broad application prospects in many fields such as medical diagnosis and environmental monitoring. The detection limit of most conventional liquid-junction electrodes based on plasticized PVC membranes is in the micromolar range, mainly due to dialysis of the main ion in the inner filling solution. One solution is to add complexing agents (such as ethylenediaminetetraacetic acid or nitrilotriacetic acid), interfering ions (tetraethylammonium nitrate) or ion exchange resins (DowexC-350) to the inner filling solution to precisely control the activity of the main ion. For example, the detection limit of a liquid-junction lead ion-selective electrode conta...
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IPC IPC(8): G01N27/333
CPCG01N27/3335
Inventor 刘玥伶王平燕蕊高营营黄浩博
Owner EAST CHINA UNIV OF SCI & TECH