A sensor device for detecting phenolic compounds in water and a preparation method thereof
A sensing device and electrochemical technology, applied in the field of phenolic compound testing devices and their preparation, can solve problems such as inability to detect at the same time, and achieve the effects of being beneficial to detection, enhancing electrochemical activity, and having a simple and easy preparation method
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Embodiment 1
[0050] (1) Prepare 0.2g / L polyaniline nanotubes for uniform ultrasonic dispersion in absolute ethanol, and simultaneously prepare 0.2g / L graphene oxide solution for uniform ultrasonic dispersion in water.
[0051] (2) Mix the polyaniline nanotube dispersion and the graphene dispersion prepared in step (1) with different mass ratios (PANI:GO=1:2) and stir overnight (12h), and wash with ethanol after centrifugation Several times, low-temperature freeze-drying, prepared graphene-coated polyaniline nanotubes.
[0052] (3) The graphene-coated polyaniline nanotubes obtained in step (2) are placed in water with a dispersion of a certain mass concentration (0.2g / L); 5 μL was drip-coated on the surface of the glassy carbon electrode, and then dried with high-purity N2 (99.999%) to obtain PANI-GO / GCE for use.
[0053] (4) Use the above-mentioned modified electrode as the working electrode, Ag / AgCl as the reference electrode, and platinum wire as the counter electrode; 0.1M PBS (pH=7.0)...
Embodiment 2
[0056] (1) Prepare 0.2g / L polyaniline nanotubes for uniform ultrasonic dispersion in absolute ethanol, and simultaneously prepare 0.2g / L graphene oxide solution for uniform ultrasonic dispersion in water.
[0057] (2) Mix the polyaniline nanotube dispersion and the graphene dispersion prepared in step (1) with different mass ratios (PANI:GO=1:5) and stir overnight (12h), and wash with ethanol after centrifugation Several times, low-temperature freeze-drying, prepared graphene-coated polyaniline nanotubes.
[0058] (3) The graphene-coated polyaniline nanotubes obtained in step (2) are placed in water with a dispersion of a certain mass concentration (0.2g / L); 5 μL was drip-coated on the surface of the glassy carbon electrode, and then dried with high-purity N2 (99.999%) to obtain PANI-GO / GCE for use.
[0059] (4) Use the above-mentioned modified electrode as the working electrode, Ag / AgCl as the reference electrode, and platinum wire as the counter electrode; 0.1M PBS (pH=7.0)...
Embodiment 3
[0068](1) The glassy carbon electrode was sequentially polished and polished with 1.0, 0.3, and 0.05 μm alumina powder, ultrasonically cleaned in ethanol and ultrapure water for 2 minutes, and then dried under high-purity nitrogen. The pretreated electrode was used for bare Electrode test as a control;
[0069] (2) Use bare electrode as working electrode, Ag / AgCl as reference electrode, platinum wire as counter electrode; 0.1M PBS (pH=7.0) as buffer solution, add 2×10 -5 mol / L bisphenol A standard solution, connected to the electrochemical workstation, connected to the computer (such as Figure 9 shown); using stripping voltammetry, record the stripping voltammogram of bisphenol A within the voltage range of 0-1.0V.
[0070] (3) Use bare electrode as working electrode, Ag / AgCl as reference electrode, and platinum wire as counter electrode; 0.1M PBS (pH=7.0) as buffer solution, add bisphenol A and phenol standard solution of different concentrations, connect Electrochemical w...
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