Preparation method and detection method of electrochemical sensor for detecting chloride ions
A detection method and electrochemical technology, applied in the field of analysis and detection, can solve the problems of narrow electrode linear range and low sensitivity, and achieve the effect of simple preparation method and good selectivity.
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Embodiment 1
[0032] The steps of a preparation method of an electrochemical sensor for detecting chloride ions are:
[0033] 1) Preparation of 3D-GN
[0034] Graphene oxide (GO) was ultrasonically dispersed in deionized water to form a 3.5mg / mL precursor solution, 30mL was added to a 50mL reactor, and hydrothermally reacted at 120°C for 6h. After the reaction, the prepared three-dimensional Graphene hydrogel is pre-frozen in a -80°C ultra-low temperature refrigerator for 2 hours, and then dried in a freeze dryer for 12 hours to obtain a three-dimensional graphene airgel 3D-GN with a three-dimensional porous structure;
[0035] 2) Preparation of working electrode
[0036] Take 1.5 mg of freeze-dried 3D-GN, mix with 18.5 mg of graphite powder and 8 μL of liquid paraffin, put it in an agate mortar and grind it, fill it into a polytetrafluoroethylene electrode tube with an inner diameter of 3 mm and compact it, and weigh The paper was polished to a smooth surface to prepare a three-dimension...
Embodiment 2
[0038] The steps of a preparation method of an electrochemical sensor for detecting chloride ions are:
[0039] 1) Preparation of 3D-GN
[0040] Ultrasonic disperse graphene oxide (GO) in deionized water to form a 5mg / mL precursor solution, take 40mL and add it to a 50mL reactor, and conduct a hydrothermal reaction at 150°C for 8 hours. After the reaction, wash the prepared three-dimensional graphite with deionized water Graphene hydrogel was pre-frozen in a -80°C ultra-low temperature refrigerator for 7 hours, and then dried in a freeze dryer for 18 hours to obtain a three-dimensional graphene airgel 3D-GN with a three-dimensional porous structure;
[0041] 2) Preparation of working electrode
[0042] Take 1.5 mg of freeze-dried 3D-GN, mix with 18.5 mg of graphite powder and 8 μL of liquid paraffin, put it in an agate mortar and grind it, fill it into a polytetrafluoroethylene electrode tube with an inner diameter of 3 mm and compact it, and weigh The paper was polished to ...
Embodiment 3
[0044] The steps of a preparation method of an electrochemical sensor for detecting chloride ions are:
[0045] 1) Preparation of 3D-GN
[0046]Ultrasonic disperse graphene oxide (GO) in deionized water to form a 2mg / mL precursor solution, take 10mL and add it to a 50mL reaction kettle, and conduct a hydrothermal reaction at 180°C for 12h. After the reaction, wash the prepared three-dimensional graphite with deionized water Graphene hydrogel was pre-frozen in a -80°C ultra-low temperature refrigerator for 12 hours, and then dried in a freeze dryer for 24 hours to obtain a three-dimensional graphene airgel 3D-GN with a three-dimensional porous structure;
[0047] 2) Preparation of working electrode
[0048] Take 1.5 mg of freeze-dried 3D-GN, mix with 18.5 mg of graphite powder and 8 μL of liquid paraffin, put it in an agate mortar and grind it, fill it into a polytetrafluoroethylene electrode tube with an inner diameter of 3 mm and compact it, and weigh The paper was polished...
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