Antibacterial photocatalyst composite hydrogel for removing heavy metals
A composite hydrogel and photocatalyst technology, applied in the direction of alkali metal compounds, alkali metal oxides/hydroxides, water pollutants, etc., can solve structural damage, decreased adsorption capacity, poor comprehensive performance of hydrogel water treatment, etc. problem, to achieve the effect of capturing sensitivity
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Embodiment 1
[0024] A cyclodextrin-based photocatalyst composite hydrogel is a composite hydrogel with a three-dimensional network structure, containing a large amount of amino groups that chelate heavy metal ions, carboxylates, and nanometer titanium dioxide with photocatalyst function, and its preparation method is as follows:
[0025] a. Preparation of polyamino-modified cyclodextrin containing double bonds: Disperse 6 parts of α-cyclodextrin into 12 parts of water, and then slowly add 8 parts of 13% potassium hydroxide aqueous solution to it until the system is transparent to obtain solution I ; Add 10 parts of p-toluenesulfonyl chloride and 15 parts of acetonitrile to the reactor, add solution I dropwise to it, 0.5h dripping is completed, continue the reaction at room temperature for 4h, end the reaction and suction filtration, the filtrate is placed in the refrigerator Overnight, a large amount of white precipitate is precipitated, and a white solid is obtained by suction filtration. The...
Embodiment 2
[0028] A cyclodextrin-based photocatalyst composite hydrogel is a composite hydrogel with a three-dimensional network structure, containing a large amount of amino groups that chelate heavy metal ions, carboxylates, and nanometer titanium dioxide with photocatalyst function, and its preparation method is as follows:
[0029] a. Preparation of polyamino-modified cyclodextrin containing double bonds: Disperse 5 parts of γ-cyclodextrin into 12 parts of water, and then slowly add 8 parts of 10% sodium hydroxide aqueous solution to it until the system is transparent to obtain solution I ; Add 15 parts of p-toluenesulfonyl chloride and 18 parts of acetonitrile to the reactor, add solution I dropwise to it, after 1h dripping, continue the reaction at room temperature for 5h, end the reaction and filter with suction, and place the filtrate in the refrigerator Overnight, a large amount of white precipitate was precipitated, and a white solid was obtained by suction filtration. The white so...
Embodiment 3
[0032] A cyclodextrin-based photocatalyst composite hydrogel is a composite hydrogel with a three-dimensional network structure, containing a large amount of amino groups that chelate heavy metal ions, carboxylates, and nanometer titanium dioxide with photocatalyst function, and its preparation method is as follows:
[0033] a. Preparation of polyamino-modified cyclodextrin containing double bonds: Disperse 7 parts of β-cyclodextrin into 13 parts of water, and then slowly add 7 parts of 14% sodium hydroxide aqueous solution to it until the system is transparent to obtain solution I ; Add 9 parts of p-toluenesulfonyl chloride and 20 parts of acetonitrile to the reactor, add solution I dropwise to it, after 0.6h dripping, continue the reaction at room temperature for 4.5h, end the reaction and filter with suction, and place the filtrate Overnight in the refrigerator, a large amount of white precipitate precipitated, suction filtration to obtain a white solid, dissolve the white soli...
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