Preparation method of nano magnesium oxide doped composite biochar
A nano-magnesium oxide and biochar technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of poor adsorption efficiency of heavy metal ions, achieve excellent removal effects, use a wide range of pH, and prepare methods simple effect
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Embodiment 1
[0024] (1) Take 5 g of carboxymethyl cellulose and 1 g of magnesium chloride and mix them evenly, then dissolve them in 500 mL of aqueous solution, and use mechanical stirring to stir the solution evenly.
[0025] (2) After mechanically stirring the mixed solution in step (1) for 4 hours, use a water bath to heat up to 85 °C to evaporate the water. When the remaining amount of the solution is 200 mL, use a syringe to inject the solution at a rate of 5 mL / min The speed is added dropwise to the ethanol solution, wherein the ethanol solution is stirred by magnetic force, and the droplets dropped into the ethanol solution will quickly form fluffy hollow spherical particles.
[0026] (3) After the fluffy particles in step (2) were collected and dried, they were pyrolyzed at 500 °C for 2 hours in a tube furnace under nitrogen protection at a heating rate of 10 °C / min to prepare biochar with a porous structure , washed twice with water and dried for later use.
Embodiment 2
[0028] (1) Take 20 g of carboxymethyl cellulose and 1 g of magnesium chloride and mix them evenly, then dissolve them in 2000 mL of aqueous solution, and use mechanical stirring to stir the solution evenly.
[0029] (2) After mechanically stirring the mixed solution in step (1) for 5 hours, use a water bath to heat up to 85 °C to evaporate the water. When the remaining amount of the solution is 300 mL, use a syringe to inject the solution at a rate of 5 mL / min The speed is added dropwise to the ethanol solution, wherein the ethanol solution is stirred by magnetic force, and the droplets dropped into the ethanol solution will quickly form fluffy hollow spherical particles.
[0030] (3) After the fluffy particles in step (2) were collected and dried, they were pyrolyzed at 400 °C for 2 hours in a tube furnace under nitrogen protection at a heating rate of 10 °C / min to prepare biochar with a porous structure , washed twice with water and dried for later use.
Embodiment 3
[0032] Test the adsorption effect of the composite material on the actual copper-containing industrial wastewater: the industrial wastewater containing copper ions was obtained from the electroplating factory, and the wastewater contained a large amount of Na + , Cl - , SO 4 2- Plasma, use sodium hydroxide to adjust the solution to pH = 8, filter out the precipitate in the wastewater, and test the copper ion concentration of the preliminary treated wastewater by flame atomic absorption method to be about 80 mg / L. Weigh 0.1 g of the composite biochar prepared in Example 1 and put it in an Erlenmeyer flask, then add 50 mL of preliminarily treated wastewater, stir it magnetically for 30 minutes, take the supernatant to detect the remaining amount of copper ions, and find that the removal rate reaches 99.9% %above. It is proved that the biochar composite material can remove copper ions from complex industrial wastewater.
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