Nitrate ion electrode with polynitroaniline as sensitive membrane and preparation method thereof
A polynitroaniline and nitrate ion technology, applied in the field of electrochemical detection, can solve problems affecting water quality, ecological system hazards, water eutrophication, etc., and achieve the effect of simple and easy production method and low cost
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preparation example Construction
[0026] Take polynitroaniline as the preparation method of the nitrate ion electrode of sensitive film, it is characterized in that its step is as follows:
[0027] 1) Dissolving one of o-nitroaniline or m-nitroaniline in 0.5 to 1.0 N hydrochloric acid solution to prepare a solution with a concentration of 0.5 to 1.0 moles, and stirring until completely dissolved to obtain a nitroaniline solution.
[0028] Aniline compounds grafted with nitrate ions are used as the precursor of the ion-sensitive membrane, and the nitrate ions should be located at the ortho or meta position of the amino group. In the prepared solution, the molar concentration of the aniline compound is preferably equal to that of hydrochloric acid.
[0029] 2) Adjust the CHI760D electrochemical workstation, the parameters are: cyclic voltammetry, scanning voltage 0-1.6V, sensitivity 10 - 3 A: With the carbon substrate to be plated as the working electrode, the platinum electrode as the auxiliary electrode, and...
Embodiment 1
[0033] 1) The copper wire with a length of 3 cm was ultrasonically cleaned in acetone solution to remove surface oil, then ultrasonically cleaned in 1M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried;
[0034] 2) Weigh 0.75g of polyacrylonitrile in 5g of dimethylformamide (DMF), heat the solution to 100°C and stir until dissolved to obtain a solution with a concentration of 15% (wt);
[0035] 3) Turn the copper wire upside down, dip in the polyacrylonitrile solution, raise the temperature to 700°C in a muffle furnace under the protection of nitrogen and keep the temperature constant for 2 hours to obtain a carbon film-coated copper wire;
[0036] 4) Weigh 1.281g of o-nitroaniline and dissolve it in 20mL of 1M hydrochloric acid to obtain a 0.5M o-nitroaniline solution; use cyclic voltammetry on the surface of the copper wire coated with carbon film by CHI760D electrochemical workstation A layer of polynitroaniline is electro...
Embodiment 2
[0039] 1) The nickel wire with a length of 3 cm was ultrasonically cleaned in acetone solution to remove surface oil, then ultrasonically cleaned in 1M dilute hydrochloric acid to remove oxides, and then dried by ultrasonic cleaning with deionized water;
[0040] 2) Weigh 0.75g of polyacrylonitrile in 5g of dimethyl sulfoxide (DMSO), heat the solution to 70°C and stir until dissolved to obtain a solution with a concentration of 15% (wt);
[0041] 3) Turn the nickel wire upside down, dip in the polyacrylonitrile solution, raise the temperature to 700°C in a muffle furnace under the protection of nitrogen and keep the temperature constant for 2 hours to obtain a carbon film-coated nickel wire;
[0042] 4) Weigh 1.281g of o-nitroaniline and dissolve it in 20mL of 1M hydrochloric acid to obtain a 0.5M o-nitroaniline solution; use cyclic voltammetry on the surface of nickel wire coated with carbon film by CHI760D electrochemical workstation A layer of polynitroaniline is electropla...
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