Modified chitosan crosslinked resin for defluorination in water and method of preparing the same
A chitosan cross-linking and chitosan technology, applied in the field of resin, can solve the problems of the application of fluorine removal in unutilized water, passivation of aluminum plate electrodes, high power consumption, etc., and achieves stable fluoride removal effect, simple regeneration, low cost effect
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Embodiment 1
[0024] Embodiment 1: the preparation of resin
[0025] Mix 1g of chitosan and 25ml of acetic acid to prepare chitosan acetate sol, add 75ml of liquid paraffin and 3.7ml of 0.2mol / L ferric chloride solution to the above reaction system and stir at a stirring speed of 160-220r / min , then add 1.5ml glutaraldehyde solution, raise the temperature to 40°C, react for 1h, adjust the pH value to 9-10 with dilute lye, then raise the temperature to 60-70°C for 4h, cool and filter with suction. Wash with petroleum ether, acetone, and ethanol three times in sequence, and finally wash with water until neutral, vacuum filter, and dry to obtain 1.72 g of iron-modified chitosan cross-linked resin.
Embodiment 2
[0026] Embodiment 2: Adopting chitosan cross-linked resin to treat fluorine-containing water
[0027] The chitosan cross-linked resin was the product of Example 1, the test environment temperature was 25°C, the pH of the fluorine-containing water was 6.8, and the fluorine-containing water was prepared by itself with a concentration of 2.0 mg / L.
[0028] Get the iron-modified chitosan cross-linked resin 0.5g prepared in Example 1 and mix it with 50ml fluorine-containing water for 12h, then filter, and measure the fluoride ion content in the filtrate to be 0.186mg / L. The analysis results show that the removal rate of chitosan cross-linked resin to fluoride ion can reach more than 80%.
Embodiment 3
[0029] Example 3: Regeneration of chitosan cross-linked resin and its effect of removing fluoride in water
[0030] Get the chitosan cross-linked resin after adsorption in embodiment 2 to regenerate with different concentrations of ammonia, and then use for defluorination, the results are as follows: figure 1 Shown: use 0.2mol / L ammonia water to regenerate the resin, the effect is the best.
[0031] Get the above-mentioned adsorbed 0.2mol / L ammonia regeneration resin, regenerate twice continuously with 0.2mol / L ammonia, and then use it for defluorination. The removal rate of fluoride can still reach more than 80%, and the fluoride content in the filtrate is measured as : 0.187mg / L and 0.187mg / L.
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