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

A technology of chitosan cross-linking and chitosan, which is applied in the field of resin, can solve the problems of unutilized water defluorination application, aluminum plate electrode passivation, and large power consumption, and achieve stable defluorination effect, simple regeneration, low cost effect

Inactive Publication Date: 2008-08-27
SHANXI UNIV
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  • 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

Method used

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

Examples

Experimental program
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Example Embodiment

[0024] Example 1: Preparation of resin

[0025] Take 1g of chitosan and 25ml of acetic acid respectively and mix to prepare chitosan acetic acid sol. Add 75ml of liquid paraffin and 3.7ml of 0.2mol / L ferric chloride solution to the above reaction system and stir at the stirring speed of 160~220r / min , Then add 1.5ml glutaraldehyde solution, heat up to 40℃, react for 1h, adjust the pH value to 9-10 with dilute lye, then heat up to 60~70℃ and react for 4h, cool and filter with suction. Washed with petroleum ether, acetone, and ethanol for 3 times, finally washed with water to neutrality, vacuum filtered and dried to obtain 1.72 g of iron-modified chitosan crosslinked resin.

Example Embodiment

[0026] Example 2: Treatment of fluorine-containing water with chitosan cross-linked resin

[0027] The chitosan cross-linked resin adopts the product of Example 1, the test environment temperature is 25°C, the pH of the fluorine-containing water is 6.8, and the fluorine-containing water is selected by self-preparation, and the concentration is 2.0 mg / L.

[0028] Take 0.5 g of the iron-modified chitosan cross-linked resin prepared in Example 1 and mix it with 50 ml of fluorine-containing water for 12 hours, then filter, and determine the fluoride ion content in the filtrate to be 0.186 mg / L. The analysis results show that the removal rate of fluoride ion by chitosan cross-linked resin can reach more than 80%.

Example Embodiment

[0029] Example 3: Regeneration of chitosan cross-linked resin and its fluoride removal effect in water

[0030] The adsorbed chitosan cross-linked resin in Example 2 was regenerated with ammonia water of different concentrations, and then used for fluorine removal. The result is shown in Figure 1: 0.2mol / L ammonia water was used to regenerate the resin with the best effect.

[0031] Take the above-mentioned adsorbed 0.2mol / L ammonia water regeneration resin, regenerate it twice in succession with 0.2mol / L ammonia water, and then use it to remove fluoride. The fluoride ion removal rate can still reach more than 80%. The fluoride ion content in the filtrate is determined to be :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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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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