Preparation method for petal-like magnesium aluminum hydrotalcite used for phosphorous removal by adsorption
A magnesium-aluminum hydrotalcite and petal-shaped technology, which is applied in the field of preparation of petal-like magnesium-aluminum hydrotalcite, can solve problems such as large specific surface area and hydrotalcite agglomeration, and achieve large specific surface area, balanced molecular structure, and adjustable surface charge density. tune effect
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Embodiment 1
[0023] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.17mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.66mol / l, and aluminum chloride hexahydrate with a concentration of 0.34mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a speed of 30 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 65°C with a stirring speed of 400rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 65°C for 18 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it. The prepared hydrotalcite material was obtained, and the product was calcined in a muffle furnace at 500° C. for 3 hours for use.
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Embodiment 2
[0028] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.18mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.92mol / l, and aluminum chloride hexahydrate with a concentration of 0.34mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a rate of 20 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 60°C with a stirring speed of 380rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 60°C for 20 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it to obtain For the prepared hydrotalcite material, the product was calcined in a muffle furnace at 450°C for 5 hours for later use.
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Embodiment 3
[0031] Prepare magnesium aluminum hydrotalcite material by titration method: configure 300ml of sodium carbonate solution with a concentration of 0.17mol / l; take 150mL of magnesium nitrate hexahydrate with a concentration of 0.66mol / l, and aluminum chloride hexahydrate with a concentration of 0.36mol / l 150mL, after mixing the two solutions, titrate into the sodium carbonate solution at a speed of 40 drops / min for reaction, the reaction is carried out in a constant temperature water bath at 75°C at a stirring speed of 420rmp, and the pH value is maintained by sodium hydroxide during the process In 8-9, a white precipitate will be found during the reaction. After the titration is completed, let it stand in an oven at 80°C for 16 hours, then wash the reaction product with distilled water until it is neutral, dry it in an oven at 80°C, and grind it to obtain For the prepared hydrotalcite material, the product was calcined in a muffle furnace at 460°C for 5 hours for later use.
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