A composite material modified glassy carbon electrode for detecting lead ions and its preparation method
A composite material and glassy carbon electrode technology, applied in the field of electroanalytical chemistry, to achieve good current response, good stability, good stability and anti-interference ability
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Embodiment 1
[0035] The method for preparing a composite material modified glassy carbon electrode for detecting lead ions in this embodiment comprises the following steps:
[0036] Step 1: Amination of core-shell Fe 3 o 4 / TiO 2 preparation of
[0037] 10mg of core-shell nano-Fe 3 o 4 / TiO 2 Disperse in a mixture of 25 mL of absolute ethanol and 5 mL of water for 30 min, then add 0.3 mL of 28% ammonia water and 30 μL of (3-aminopropyl) triethoxysilane and stir for 24 h, and wash the product with absolute ethanol 5 times, and then dried at 60°C for 2h.
[0038] Step 2: Preparation of carboxylated nitrogen-doped graphene / gold nanoparticles
[0039] Ultrasonic dispersion of 40 mg of carboxylated nitrogen-doped graphene in 40 mL of water, adjusting the pH of the solution to 10 with ammonia water, then adding 6 mL of nano-gold solution, refluxed with nitrogen at 100 ° C for 10 h, and the product was washed with absolute ethanol and water to Neutral, then dry at 60°C for 4h.
[0040] S...
Embodiment 2
[0050] The preparation method of the composite material modified glassy carbon electrode for detecting lead ions of the present embodiment, according to the following steps:
[0051] Step 1: Amination of core-shell Fe 3 o 4 / TiO 2 preparation of
[0052] The difference from Example 1 is: the product was washed 5 times with absolute ethanol, and then dried at 40° C. for 6 hours;
[0053] Step 2: Preparation of carboxylated nitrogen-doped graphene / gold nanoparticles
[0054] Ultrasonic dispersion of 100 mg of carboxylated nitrogen-doped graphene in 200 mL of water, adjusting the pH of the solution to 11 with ammonia water, and then adding 15 mL of nano-gold solution, refluxed nitrogen at 110 ° C for 24 h, and washed the product with absolute ethanol and water to Neutral, then dry at 50°C for 6h.
[0055] Step 3: Fe 3 o 4 / TiO 2 / NG / Au composites
[0056] Weigh the carboxylated nitrogen-doped graphene / nanogold 150mg in step 2 and add 1-ethyl-3-(3-dimethylaminopropyl) car...
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