Preparation method and application of water hyacinth-magnesium oxide composite biochar
A technology of magnesium oxide and water hyacinth, applied in chemical instruments and methods, water pollutants, biofuels, etc., can solve the problems of low adsorption capacity, and achieve the effects of low cost of materials, increased yield, and realization of resource utilization value.
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Embodiment 1
[0021] (1) Take freshly picked water hyacinth, wash it with clean water, dry it in an oven at 80°C for 16 hours, and pass it through a 0.1mm sieve after crushing to obtain fine water hyacinth powder; similarly, dry the magnesium oxide in an oven at 80°C for 16 hours, Pass through a 0.1mm sieve to obtain magnesium oxide fine powder; fully mix the water hyacinth fine powder and magnesium oxide fine powder according to the mass ratio of 19:1, so that the magnesium oxide content is 5% of the mixed material.
[0022] (2) with step (1) gained mixed homogeneous raw material, in logical N 2 Under anaerobic conditions, the temperature was raised to 500°C at a rate of 8°C / min, thermally cracked for 2 hours, and naturally cooled to room temperature to obtain water hyacinth-magnesia composite biochar A.
[0023] (3) Take 100mL of wastewater with Pb and Cd concentrations of 150 and 50mg / L respectively, adjust the pH value to 5.0, add 0.2g of the water hyacinth-magnesia composite biochar A,...
Embodiment 2
[0026] (1) Take freshly picked water hyacinth, wash it with clean water, dry it in an oven at 90°C for 10 hours, and pass it through a 0.3mm sieve after crushing to obtain fine water hyacinth powder; similarly, dry the magnesium oxide in an oven at 90°C for 10 hours, Pass through a 0.3mm sieve to obtain magnesium oxide fine powder; fully mix the water hyacinth fine powder and magnesium oxide fine powder according to the mass ratio of 9:1, so that the magnesium oxide content is 10% of the mixed material.
[0027] (2) with step (1) gained mixed homogeneous raw material, in logical N 2 Under anaerobic conditions, the temperature was raised to 400°C at a rate of 3°C / min, thermally cracked for 4 hours, and naturally cooled to room temperature to obtain water hyacinth-magnesia composite biochar B.
[0028] (3) Take 100mL of waste water with Pb and Cd concentrations of 150 and 50mg / L respectively, adjust the pH value to 7.0, add 0.2g of the water hyacinth-magnesia composite biochar B...
Embodiment 3
[0031] (1) Take freshly picked water hyacinth, wash it with water, dry it in an oven at 90°C for 12 hours, and pass it through a 0.1mm sieve after crushing to obtain fine water hyacinth powder; similarly, dry the magnesium oxide in an oven at 90°C for 12 hours, Pass through a 0.1mm sieve to obtain magnesium oxide fine powder; fully mix water hyacinth fine powder and magnesium oxide fine powder according to the mass ratio of 4:1, so that the content of magnesium oxide is 20% of the mixed material.
[0032] (2) with step (1) gained mixed homogeneous raw material, in logical N 2 Under anaerobic conditions, the temperature was raised to 500°C at a rate of 5°C / min, thermally cracked for 3 hours, and cooled to room temperature naturally to obtain water hyacinth-magnesia composite biochar C.
[0033] (3) Take 100mL of waste water with Pb and Cd concentrations of 200 and 50mg / L respectively, adjust the pH value to 6.0, add 0.2g of the water hyacinth-magnesia composite biochar C, and o...
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