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

Inactive Publication Date: 2009-12-09
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the treatment process of the two, the pH value of the water quality is high, and the electrocoagulation method also has problems such as passivation of the aluminum plate electrode and large power consumption.
The use of chitosan cross-linked resin to treat wastewater is mainly used for the removal of heavy metal ions in wastewater, and there is no application of using it to remove fluoride in water

Method used

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  • Modified chitosan crosslinked resin for defluorination in water and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

A modified chitosan cross-linked resin for removing fluorine in the water is provided, in particular a ferric-modified chitosan cross-linked resin. The resin is prepared from chitosan with a high deacetylation degree higher than or equal to 95% as the raw material and ferric chloride as the modifier. The resin is used for removing the fluorine in the water with stable effect at a removal rate of more than 80%, and has the advantages of fracture prevention, simple regeneration and low cost. The resin can be used for treatment of industrial fluorine-containing water and high- fluorine drinking water as well.

Description

technical field [0001] The invention relates to a resin, in particular to a modified chitosan cross-linked resin used for removing fluorine in water and a preparation method thereof. Background technique [0002] my country's high-fluoride disease areas spread across 27 provinces, municipalities, and autonomous regions, especially in Northwest and North China. About 77 million people in the country drink groundwater with a fluoride content of more than 1mg / L, and nearly 5 million of them drink water containing The amount of fluorine exceeds 5.0mg / L. According to statistics in 2002, there were 1,117 counties and 117,389 villages affected by drinking-water fluorosis nationwide, with a threatened population of about 82.74 million. There are currently 22.14 million dental fluorosis patients and 1.36 million bone fluorosis patients. [0003] Fluoride-containing water includes fluoride-containing groundwater and fluoride-containing industrial sewage. Fluorine-containing groundwat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28
Inventor 李华孔令冬时伟宇程芳琴杨凤玲
Owner SHANXI UNIV
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