Preparation method of electrochemical sensor and method for determining phenolic compounds in water body
A phenolic compound and electrochemical technology, applied in the field of rapid detection, can solve the problems of complex preparation method, single detection of one type of phenolic substances, etc., and achieve the effects of simple preparation method, simple preparation method and low cost
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Embodiment 1
[0042] Embodiment 1: the preparation of pencil graphite electrode and the establishment of electrochemical analysis method
[0043] Construction of electrochemical sensor: cetyltrimethylammonium bromide solution was prepared by the following process: cetyltrimethylammonium bromide (CTAB) was added to 0.1mol / L sulfuric acid solution to obtain the concentration It is 0.045mol / L cetyltrimethylammonium bromide solution.
[0044] The single-walled carbon nanotubes were ultrasonically dispersed in the hexadecyltrimethylammonium bromide solution, and sonicated for 20 min to obtain a 0.1 mg / mL single-walled carbon nanotube suspension.
[0045] Then immerse the graphite pencil electrode to be modified into the suspension of single-walled carbon nanotubes, the immersion length: 15mm, perform electrochemical polymerization by cyclic voltammetry, the potential scanning range is -0.8V~1.2V, and the scanning rate is 100mV / s. Cycle through 20 laps, dry, and set aside.
[0046] Establishmen...
Embodiment 2
[0051] Example 2: Comparison of the effects of different types of electrodes on the determination of phenolic substances
[0052] Using bare pencil graphite electrode, bare glassy carbon electrode and modified pencil graphite electrode as working electrode, Ag / AgCl electrode as reference electrode, and platinum wire electrode as counter electrode, the electrochemical analysis method established above was used to detect 50 μmol / L of phenol solution. The result is as figure 1 as shown, figure 1 Among them, a represents the bare glassy carbon electrode; b represents the bare graphite pencil electrode; c represents the graphite pencil electrode modified with carbon nanotubes.
[0053] The modified pencil graphite electrode has the highest detection sensitivity for phenol.
Embodiment 3
[0054] Embodiment 3: the impact of water body pH on the detection of phenolic compounds
[0055] The influence of different pH on the electrochemical performance of detecting phenolic compounds was investigated, and the four conditions of pH=5.3, 6.2, 7.2, and 8.2 were investigated respectively. 50μmol / L phenol solution was prepared with different pH buffer solutions as the solution to be tested. The result obtained is as figure 2 shown. from figure 2 It can be seen that the sensitivity of testing phenolic compounds is the highest under the condition of pH=7.2, so pH=7.2 is selected as the best test pH.
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