Calcium bentonite -AA- (AA-Na) composite cadmium ion adsorbent
A calcium-based bentonite and adsorbent technology, which is applied in the direction of adsorbing water/sewage treatment, water/sludge/sewage treatment, and other chemical processes to achieve the effects of good adsorption performance, low swelling and low cost
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Embodiment 1
[0032] The first step, the preparation of purified calcium-based bentonite
[0033] Calcium-based bentonite slag and tap water are added in a mass ratio of 1:7, stirred for 30min, left to stand for 24h, the lower layer of sand is discarded, then stirred for 15min, and then tap water is added to form a mass ratio of calcium-based bentonite slag:water= 1:10 feed solution, continue to stir for 20 minutes, then let it settle for 5 hours, take out the supernatant for the next preparation of the feed solution, take out the upper layer of fine soil from the sediment, discard the lower layer of sandy soil, and put the fine soil into 110 ℃ in an oven until the quality of the refined soil remains unchanged, then crushed and passed through a 200-mesh sieve to obtain purified calcium-based bentonite.
[0034] figure 1 In order to purify the XRD pattern of bentonite, calculate d through the characteristic peak of the pattern (001） , so as to determine the type of bentonite as calcium-based...
Embodiment 2
[0042] The first step, the preparation of purified calcium-based bentonite
[0043] With the first step of embodiment 1;
[0044] The second step, solution polymerization
[0045] First, measure 4ml of acrylic acid solution with a volume fraction of 50% (the mass of pure acrylic acid is 2g), neutralize with 7.4441g of sodium hydroxide solution with a mass fraction of 5.97%, and prepare an acrylic acid solution with a neutralization degree of 40%; then , add 8g of purified calcium-based bentonite and the above partially neutralized acrylic acid solution (11.4441g) into the reactor and rinse with 6ml of deionized water, stir well at room temperature; add 0.25g of cross-linking agent N,N- Methylenebisacrylamide was stirred at room temperature for 1 h; finally, 0.08 g of initiator potassium persulfate was added, stirred at room temperature for 5 min, then heated to 80°C, and continued to stir for 3 h to obtain a wet solid phase product.
[0046] The third step is to dry the obta...
Embodiment 3
[0050] The first step, the preparation of purified calcium-based bentonite
[0051] With the first step of embodiment 1;
[0052] The second step, solution polymerization
[0053] First, measure 4ml of acrylic acid solution with a volume fraction of 50% (the mass of pure acrylic acid is 2g), neutralize with 7.3331g of sodium hydroxide solution with a mass fraction of 4.54%, and prepare an acrylic acid solution with a neutralization degree of 30%; then , add 8g of purified calcium-based bentonite and the partially neutralized acrylic acid solution (11.3331g) in the reactor and rinse with 6ml of deionized water, stir well at room temperature; add 0.25g of crosslinking agent N,N- Methylenebisacrylamide was stirred at room temperature for 1 h; finally, 0.08 g of initiator potassium persulfate was added, stirred at room temperature for 5 min, then heated to 80°C, and continued to stir for 3 h to obtain a wet solid phase product.
[0054] The third step is to dry the obtained comp...
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Abstract
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