Ag<+>-SiO2 material for detecting formaldehyde, preparation method and detection method
A formaldehyde and microsphere technology, applied in the field of environmental detection, can solve the problems of many interfering substances, short working life and high price, and achieve the effects of rich raw material sources, wide linear range and enhanced conductivity
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Embodiment 1
[0032] First, at room temperature, 1.0 mL of tetraethyl orthosilicate (99%), 30 mL of absolute ethanol, 2.5 mL of ultrapure water and 1.0 mL of ammonia water (26%) were sequentially added and stirred for 4 hours. Then the reaction solution was centrifuged and washed three times with ethanol and water respectively, and was fixed to 8 mL of water to obtain SiO 2 microsphere suspension. Next, take 2.5 mL of SiO 2 Microsphere suspension and 1 mL of AgNO 3 (0.25mol L -1 ) solution was reacted for 3 hours, centrifuged and washed three times with water and dispersed into 25mL of water to obtain Ag + -SiO 2 microsphere suspension. Then, the glassy carbon electrode was polished with AlO suspensions of different particle sizes, dried with nitrogen, and 10 μL of Ag + -SiO 2 The suspension was drip-coated on the surface of the cleaned glassy carbon electrode, and after drying, the weakly bonded Ag was rinsed with water. + -SiO 2 Particles, to get Ag + -SiO 2 Modified glassy car...
Embodiment 2
[0034] First, at room temperature, 4.0 mL of tetraethyl orthosilicate (99%), 110 mL of absolute ethanol, 9 mL of ultrapure water and 3.6 mL of ammonia water (26%) were sequentially added and stirred for 6 hours. Then the reaction solution was centrifuged and washed three times with ethanol and water respectively, and was fixed to 30 mL of water to obtain SiO 2 microsphere suspension. Next, take 10 mL of SiO 2 Microsphere suspension and 4 mL of AgNO 3 (1.0mol L -1 ) solution was reacted for 9 hours, centrifuged and washed three times with water and dispersed into 100mL of water to obtain Ag + -SiO 2 microsphere suspension. Then, the glassy carbon electrode was polished with Al2O3 suspensions of different particle sizes, dried with nitrogen, and 30 μL of Ag + -SiO 2 The suspension was drip-coated on the surface of the cleaned glassy carbon electrode, and after drying, the weakly bonded Ag was rinsed with water. + -SiO 2 Particles, to get Ag + -SiO 2 Modified glassy ca...
Embodiment 3
[0036] First, at room temperature, 2.0 mL of tetraethyl orthosilicate (99%), 55 mL of absolute ethanol, 4.5 mL of ultrapure water and 1.8 mL of ammonia water (26%) were sequentially added and stirred for 5 hours. Then the reaction solution was centrifuged and washed three times with ethanol and water respectively, and was fixed to 15 mL of water to obtain SiO 2 microsphere suspension. Next, take 5 mL of SiO 2 Microsphere suspension and 2 mL of AgNO 3 (0.5mol L -1 ) solution was reacted for 6 hours, centrifuged and washed three times with water and dispersed into 50mL of water to obtain Ag + -SiO 2 microsphere suspension. Then, the glassy carbon electrode was polished with Al2O3 suspensions of different particle sizes, dried with nitrogen, and 20 μL of Ag + -SiO 2 The suspension was drip-coated on the surface of the cleaned glassy carbon electrode, and after drying, the weakly bonded Ag was rinsed with water. + -SiO 2 Particles, to get Ag + -SiO 2 Modified glassy car...
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