Preparation method of composite hydrogel, composite hydrogel and application of composite hydrogel
A composite hydrogel and waste water technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve problems such as inability to be repeatedly used for a long time, low reuse rate of adsorbent materials, and insufficient mechanical strength , to achieve good application prospects, easy solid-liquid separation, and high adsorption efficiency
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[0031] The invention provides a kind of preparation method of composite hydrogel, comprises the following steps:
[0032] A: Preparation of amidoximated polyacrylonitrile: dissolving polyacrylonitrile in an organic solvent for amidoxime modification treatment to obtain amidoximated polyacrylonitrile;
[0033] B: washing the amidoximated polyacrylonitrile obtained in step A with water, and drying;
[0034] C: Mix sodium alginate and amidoximated polyacrylonitrile prepared in step B, add water, stir evenly with a stirrer, drop into calcium chloride solution, and let stand for 8-20 hours to obtain composite water gel;
[0035] D: After washing the composite hydrogel obtained in step C with water, freeze-drying.
[0036] In the preparation method of the composite hydrogel provided by the present invention, as a preferred solution, in step C, the mass ratio of the amidoximated polyacrylonitrile and the sodium alginate mixed is 1:1.
[0037] The preparation method of the composit...
Embodiment 1
[0041] The present embodiment provides the preparation method of composite hydrogel, and concrete steps are:
[0042] (1) Preparation of amidoximated polyacrylonitrile (PAO): 5.0 g of polyacrylonitrile was mixed with 12 g of hydroxylamine hydrochloride, 50 mL of deionized water and 50 mL of methanol. The pH of the suspension was adjusted to neutral with 1.0 mol / L Na2CO3, and after reacting at 70°C for 2 hours, the product was obtained by centrifugation, washed several times with deionized water, dried and sieved.
[0043] (2) Mix 800mg of sodium alginate and 800mg of amidoximated polyacrylonitrile in 30mL of deionized water, stir with a magnetic stirrer for 30min, then drip into 120mL of calcium chloride solution with a syringe, the calcium chloride solution Obtained by dissolving 2.64g of anhydrous calcium chloride. The formed hydrogel was kept overnight in calcium chloride solution, washed several times with water, and freeze-dried.
Embodiment 2
[0044] The present invention also provides embodiment 2-embodiment 9, using the prepared composite hydrogel to adsorb uranium in uranium-containing wastewater, specifically, adding a certain proportion of adsorbent to uranium-containing wastewater, at a certain temperature Under the shock adsorption for a certain period of time, then measure the concentration of uranium in the waste water, calculate and analyze its adsorption rate, please refer to Example 2-Example 9:
[0045] Example 2
[0046] Take 50 mL of uranium solution with an initial concentration of 0.5 mg / L, adjust the pH value of the uranium solution to 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, and 9.00 in triplicate, and add 5.00 mg of lyophilized compound The hydrogel was oscillated and adsorbed in a constant temperature culture shaker with a rotational speed of 180 rpm at 30° C., and the time was counted from the time when the adsorbent was added to the solution, and the oscillating adsorption was 24 minutes.
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