Preparation method of porous calcium alginate gel spheres for treating heavy metal sewage
A calcium alginate gel ball and sewage treatment technology, applied in the field of preparation of polymer porous materials, can solve the problems of large pore size uniformity, small specific surface area, affecting the adsorption effect of heavy metal ions, etc., and achieve the effect of improving the adsorption effect
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[0043] Example 1
[0044] 20g of deionized water and 0.2g of sodium alginate were added to a 100ml beaker and placed on a stirrer to stir for 6 hours to prepare a 1% sodium alginate solution.
[0045] Add 0.05 g of 2% polystyrene microsphere emulsion to the above sodium alginate solution to form a mixed solution with a particle size of about 600 nm, and place the mixed solution on a stirrer and stir for 6 hours.
[0046] The above-mentioned homogeneous mixed solution was added dropwise to 0.2M calcium chloride solution with a dropper, and the formed gel ball was washed with deionized water three times and then placed in a low-temperature refrigerator for 12 hours.
[0047] The frozen samples were put into a vacuum freeze dryer for vacuum freeze-drying for 48 hours. After the completion, the porous calcium alginate gel balls were obtained. The obtained sample is denoted as 2#.
Example Embodiment
[0048] Example 2
[0049] Add 0.1g of 2% polystyrene microsphere emulsion to the 1% sodium alginate solution prepared in Example 1 to form a mixed solution with a particle size of about 600nm, and place the mixed solution on a stirrer to stir 6h.
[0050] The above-mentioned homogeneous mixed solution was added dropwise to 0.2M calcium chloride solution with a dropper, and the formed gel ball was washed with deionized water three times and then placed in a low-temperature refrigerator for 12 hours.
[0051] The frozen samples were put into a vacuum freeze dryer for vacuum freeze-drying for 48 hours. After the completion, the porous calcium alginate gel balls were obtained. The sample obtained is designated as 3#.
Example Embodiment
[0052] Example 3
[0053] To the 1% sodium alginate solution prepared in Example 1, 0.5g of 2% polystyrene microsphere emulsion was added to form a mixed solution with a particle size of about 600nm, and the mixed solution was placed on a stirrer and stirred for 6 hours .
[0054] The above-mentioned homogeneous mixed solution was added dropwise to 0.2M calcium chloride solution with a dropper, and the formed gel ball was washed with deionized water three times and then placed in a low-temperature refrigerator for 12 hours.
[0055] The frozen samples were put into a vacuum freeze dryer for vacuum freeze-drying for 48 hours. After the completion, the porous calcium alginate gel balls were obtained. The sample obtained is designated as 4#.
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