Fluorine-removing lanthanum-supported fiber adsorbent and synthesis method thereof

An adsorbent and fiber technology, applied in the field of lanthanum-loaded defluorinated fiber adsorbent and its synthesis, and fiber adsorbent, can solve the problems of cumbersome process, etc., and achieve the effects of short preparation route, mild reaction conditions and sufficient supply

Inactive Publication Date: 2012-12-12
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method involves multi-step reaction, and the process is relatively loaded down with trivial details

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Fiber sorbent synthesis: at 130-140 o Under C, the commercial acrylic fiber is reacted with triethylenetetramine to prepare cross-linked fiber; the gained cross-linked fiber is added in the hydroxylamine hydrochloride solution containing sodium carbonate, at 90-100 o Keep constant temperature reaction under 1 hour under ℃, make amidoxime fiber after the fiber after reaction is washed with water, dry; Amidoxime fiber is joined in the lanthanum nitrate aqueous solution of 1 mmol / L, the add-on of control amidoxime fiber is 2 g / L lanthanum nitrate aqueous solution, after shaking at room temperature for 24 hours, take out the fiber at 60 o C and dried to constant weight, the lanthanum-loaded fiber adsorbent for fluoride removal was obtained. The lanthanum loading of the fiber adsorbent was measured to be 0.02 g / g fiber.

[0013] Application of fiber adsorbent: Weigh 0.5 g of the fiber and place it in 100 mL of 5 mg / L fluoride ion solution. After 24 hours of adsorption on a...

Embodiment 2

[0019] Synthesis of fiber adsorbent: the concentration of lanthanum nitrate aqueous solution is increased to 10 mmol / L, and other conditions are the same as in Example 1. The lanthanum loading of the fiber adsorbent was measured to be 0.07 g / g fiber.

[0020] Application of fiber adsorbent: Weigh 0.1 g of the fiber and place it in 100 mL of 5 mg / L fluoride ion solution. After 24 hours of adsorption on a shaking table, the residual concentration of fluoride ion in the test solution is 0.30 mg / L.

Embodiment 3

[0022] Fiber adsorbent synthesis: the concentration of lanthanum nitrate aqueous solution is adjusted to 5 mmol / L, the addition of amidoxime fiber is increased to 5 g / L lanthanum nitrate aqueous solution, and other conditions are the same as in Example 1. The lanthanum loading of the fiber adsorbent was measured to be 0.03 g / g fiber.

[0023] Application of fiber adsorbent: Prepare a series of 100 mL fluorine-containing water with a fluoride ion concentration of 5 mg / L, and adjust the pH value of the solution within the range of 4-10 with dilute HCl or dilute NaOH. Take 0.1 g of the fiber adsorbent and place it in the above-mentioned fluorine-containing water, shake and adsorb at room temperature for 24 hours, separate the supernatant to measure the fluoride ion concentration and calculate the fluorine removal rate. The results are shown in Table 1. It can be seen that the concentration of fluoride ions in the purified water meets the national "Drinking Water Hygienic Standard...

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Abstract

The invention discloses a fluorine-removing lanthanum-supported fiber adsorbent and a synthesis method thereof, belonging to the field of polymer materials. The fiber adsorbent comprises an active component and a matrix fiber, wherein the matrix fiber is an amidoxime fiber prepared through polyamine crosslinking reaction and amidoxime modification reaction of an acrylic fiber; and the active component is element lanthanum supported on the matrix fiber through in-situ reaction. The fiber adsorbent can be used for adsorbing and removing fluorine pollutants in water. Compared with the conventional fluorine-removing adsorbents, the novel fiber adsorbent disclosed by the invention has the characteristics that the adsorption speed is high, the adsorption capacity is as high as 34mg / g, the range of applicable pH value is as wide as 4-8 and the fiber adsorbent can be applied in various forms such as fiber bundles, non-woven fabrics and fabrics and can further meet the requirement of actual water treatment. The synthesis method has the advantages of available raw materials, simple process, mild reaction conditions and the like.

Description

technical field [0001] The invention relates to a fiber adsorbent, in particular to a lanthanum-loaded fiber adsorbent for defluoridation and a synthesis method thereof, belonging to the field of polymer materials. Background technique [0002] Fluorine is one of the essential trace elements for the human body, and fluorine in drinking water is a double-edged sword for human health. Drinking water with a fluoride ion concentration of 0.5-1.0 mg / L can strengthen bones and teeth and reduce the incidence of dental caries. However, once the concentration of fluoride ions in the water exceeds the standard, long-term drinking of high-fluoride water will cause bone brittleness, tooth stains, ligament calcification, joint stiffness and even paralysis, and severe cases will lose the ability to work. Therefore, my country's "Drinking Water Hygienic Standards" (GB 5749-2006) stipulates that the concentration of fluoride ions in drinking water should not exceed 1.0 mg / L. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/14
Inventor 赵亮王静唐思远韩洛利
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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