A preparation method of straw-based activated carbon supercapacitor electrode material for enhancing energy storage efficiency by acid mine wastewater
An acid mine wastewater and supercapacitor technology, applied in the field of electrochemistry, can solve the problem of unsatisfactory performance optimization effect of straw-based activated carbon, and achieve the effects of high-value utilization, high specific capacitance and pollution reduction.
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Embodiment 1
[0028] The present embodiment prepares activated carbon according to the following steps:
[0029] (1) Dry the collected straw at 80°C for 5 hours, pulverize it through a 40-mesh sieve, and obtain straw particles for use;
[0030] (2) Soak the straw particles in acid mine wastewater with a pH of 2.6, sonicate for 2 hours, soak at room temperature for 8 hours, and then put them into an oven to dry at 90°C to obtain the treated straw particles;
[0031] (3) Put 6g of the treated straw particles in a high-temperature tube furnace, under the protection of inert gas nitrogen, heat up to 500°C at a heating rate of 5°C / min, carbonize at a constant temperature for 1h, then stop heating, and continue under the protection of nitrogen Cool to room temperature, take out and grind into powder to obtain carbonized powder;
[0032] (4) Mix 3g of carbonized material powder with 6g of solid powder KOH, then add 200mL of deionized water, ultrasonically disperse uniformly, and then heat in a wa...
Embodiment 2
[0042] The present embodiment prepares activated carbon according to the following steps:
[0043] (1) Dry the collected straw at 80°C for 5 hours, pulverize it through a 40-mesh sieve, and obtain straw particles for use;
[0044] (2) Take 200 mL of an acid mine wastewater with an initial pH of 2.6 and place it in a beaker and adjust its pH to 4.0; soak the straw particles in the acid mine wastewater with a pH of 4.0, ultrasonicate for 2 hours, and then soak at room temperature for 8 hours, and then Put it in an oven to dry at 90°C to obtain the treated straw particles;
[0045] (3) Put 6g of the treated straw particles in a high-temperature tube furnace, under the protection of inert gas nitrogen, heat up to 550 °C at a heating rate of 5 °C / min, carbonize at a constant temperature for 1 h, then stop heating, and continue under the protection of nitrogen Cool to room temperature, take out and grind into powder to obtain carbonized powder;
[0046] (4) Mix 3g of carbonized ma...
Embodiment 3
[0053] The present embodiment prepares activated carbon according to the following steps:
[0054] (1) Dry the collected straw at 80°C for 5 hours, pulverize it through a 40-mesh sieve, and obtain straw particles for use;
[0055] (2) Take 200 mL of an acid mine wastewater with a pH value of 6.0 and put it in a beaker, soak the straw particles in the acid mine wastewater, sonicate for 2 hours, soak it at room temperature for 8 hours, and then put it in an oven to dry at 90 °C to obtain Treated straw particles;
[0056] (3) Put 6g of the treated straw particles in a high-temperature tube furnace, under the protection of inert gas nitrogen, heat up to 600°C at a heating rate of 5°C / min, carbonize at a constant temperature for 1h, then stop heating, and continue under the protection of nitrogen Cool to room temperature, take out and grind into powder to obtain carbonized powder;
[0057] (4) Mix 3g of carbonized material powder with 12g of solid powder KOH, then add 200mL of de...
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Abstract
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