Preparation method of layered rare earth hydroxide composite membrane modified electrode and application of layered rare earth hydroxide composite membrane modified electrode in detection of benzenediol substances
A rare earth hydroxide and modified electrode technology, which is applied in the field of functional materials and electroanalytical chemical detection, can solve the problems affecting the application of electrochemical sensors, etc., and achieve the effects of improving capture and electrocatalysis capabilities, simple preparation methods, and low detection limits
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Embodiment 1
[0027] (1) Preprocessing of GCE
[0028] The GCE was sequentially polished with a slurry made of 0.05 μm alumina powder and suede until the surface was smooth and mirror-like, washed with ultrapure water and ethanol in sequence, and N 2 Blow dry to obtain pretreated GCE;
[0029] (2) Preparation of LRH / GCE
[0030] A certain amount of rare earth yttrium nitrate is dissolved in de-ultrapure water and is mixed with the rare earth yttrium nitrate solution that concentration is 0.01mol / L; The GCE after pretreatment in the step (1) is used as working electrode, and counter electrode, reference electrode To form a three-electrode system, insert it into the rare earth yttrium nitrate solution, set the electrodeposition temperature to 25°C, the deposition voltage to -1.00V, and the electrodeposition time to 90s. The layered rare earth hydroxide modified electrode was obtained by electrodeposition. Pure water, ethanol washing, N 2 Blow dry, denoted as LRH / GCE;
[0031] (3) Preparat...
Embodiment 2
[0034] (1) Preprocessing of GCE
[0035] Prepared according to the method and conditions in step (1) in Example 1;
[0036] (2) Preparation of LRH / GCE
[0037] A certain amount of rare earth yttrium nitrate is dissolved in de-ultrapure water and is mixed with the rare earth yttrium nitrate solution that concentration is 0.05mol / L; The GCE after pretreatment in step (1) is used as working electrode, and counter electrode, reference electrode To form a three-electrode system, insert it into the rare earth yttrium nitrate solution, set the electrodeposition temperature to 25°C, the deposition voltage to -1.00V, and the electrodeposition time to 90s. The layered rare earth hydroxide modified electrode was obtained by electrodeposition. Pure water, ethanol washing, N 2 Blow dry, denoted as LRH / GCE;
[0038] (3) Preparation of AuNPs / LRH / GCE
[0039] Prepare according to the method and conditions in step (3) in Example 1.
Embodiment 3
[0041] (1) Preprocessing of GCE
[0042] Prepared according to the method and conditions in step (1) in Example 1;
[0043] (2) Preparation of LRH / GCE
[0044] Prepared according to the method and conditions in step (2) in Example 1;
[0045] (3) Preparation of AuNPs / LRH / GCE
[0046] A certain amount of HAuCl 4 Dissolved in ultrapure water to prepare HAuCl with a concentration of 0.005mol / L 4 solution; the LRH / GCE prepared in step (2) is used as a working electrode, forms a three-electrode system with a counter electrode and a reference electrode, and inserts HAuCl 4 In the solution, set the electrodeposition temperature to 25°C, the deposition voltage to -0.20V, and the electrodeposition time to 60s. Electrodeposited to obtain a gold nanoparticle / layered rare earth hydroxide composite film modified electrode, followed by ultrapure water, Washed with ethanol, N 2 Blow-dried, recorded as AuNPs / LRH / GCE.
[0047] figure 1 It is the SEM image of the layered rare earth hydr...
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