Preparation method of electrochemical sensor based on loofah sponge biomass charcoal composite material and preparation method of composite material
A technology of composite materials and biochar, applied in the direction of material electrochemical variables, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of limiting the commercial application of electrochemical sensors, easily producing environmental pollutants, and complicated preparation processes. To achieve the effect of broadening the source of precursors, low price, and simple carbonization process
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Embodiment 1
[0033] Pre-carbonized loofah: First soak the loofah alternately with deionized water and ethanol, ultrasonically wash to remove dirt and impurities on the surface, and then place it in a 100°C drying oven to dry. Then place the dried loofah in a porcelain boat, move it into a high-temperature tube furnace, feed it with argon, heat it up to 400°C at a constant rate of 5°C / min for calcination, keep it warm for 1 hour, then cool it down to room temperature naturally, and crush it , obtain loofah powder, stand-by;
[0034] Potassium hydroxide activated loofah powder: Weigh the loofah powder and potassium hydroxide powder prepared in the pre-carbonized loofah step and mix them according to the mass ratio of 1:1, add 20mL of deionized water for ultrasonic dispersion, and dry at 100°C Dry in the box until the solution evaporates; move it into a high-temperature tube furnace for activation, pass in argon, and heat up to 600°C at a constant rate of 5°C / min for calcination for 1 hour. A...
Embodiment 2
[0038] Pre-carbonized loofah: First soak the loofah alternately with deionized water and ethanol, ultrasonically wash to remove dirt and impurities on the surface, and then place it in a 100°C drying oven to dry. Then place the dried loofah in a porcelain boat, move it into a high-temperature tube furnace, feed it with argon, heat it up to 500°C at a constant rate of 5°C / min for calcination, keep it warm for 2 hours, then cool it naturally to room temperature, and crush it , obtain loofah powder, stand-by;
[0039] Potassium hydroxide activated loofah powder: Weigh the loofah powder and potassium hydroxide powder prepared in the pre-carbonized loofah step and mix them according to the mass ratio of 1:2, add 20mL deionized water for ultrasonic dispersion, and dry at 100°C Dry in the box until the solution evaporates; move it into a high-temperature tube furnace for activation, pass in argon, and heat up to 700°C at a constant rate of 5°C / min for calcination for 2 hours. After c...
Embodiment 3
[0043] Pre-carbonized loofah: First soak the loofah alternately with deionized water and ethanol, ultrasonically wash to remove dirt and impurities on the surface, and then place it in a 100°C drying oven to dry. Then place the dried loofah in a porcelain boat, move it into a high-temperature tube furnace, feed it with argon, heat it up to 600°C at a constant rate of 5°C / min for calcination, keep it warm for 3 hours, then cool it naturally to room temperature, and crush it , obtain loofah powder, stand-by;
[0044] Potassium hydroxide activated loofah powder: Weigh the loofah powder obtained in the pre-carbonized loofah step and mix with potassium hydroxide powder according to the mass ratio of 1:3, add 20mL of deionized water for ultrasonic dispersion, and then dry at 100°C Dry in the box until the solution evaporates; move it into a high-temperature tube furnace for activation, pass in argon, and heat up to 800°C at a constant rate of 5°C / min for calcination for 3 hours. Aft...
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