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Preparation method and application of iron modified chitosan hydroxyapatite composite ultrafiltration membrane

A technology of chitosan hydroxyapatite and ultrafiltration membrane is applied in the field of water treatment, which can solve the problems of dental fluorosis and nerve damage, and achieve the effects of ensuring drinking water safety, increasing spatial structure, and increasing adsorption sites.

Pending Publication Date: 2021-11-12
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fluorine is an essential trace element for the human body, long-term intake of excessive fluoride can cause damage to dental fluorosis, skeletal fluorosis and nerve damage

Method used

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  • Preparation method and application of iron modified chitosan hydroxyapatite composite ultrafiltration membrane
  • Preparation method and application of iron modified chitosan hydroxyapatite composite ultrafiltration membrane
  • Preparation method and application of iron modified chitosan hydroxyapatite composite ultrafiltration membrane

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preparation example Construction

[0022] The preparation method of iron-modified chitosan hydroxyapatite composite ultrafiltration membrane comprises the following steps:

[0023] S1, dissolving chitosan (CS) in volume concentration is 3% acetic acid (CH 3 COOH) solution to prepare chitosan gel with a mass volume concentration of 6% to 20%, and ferrous chloride tetrahydrate (FeCl 2 .4H 2 O) and ferric chloride hexahydrate (FeCl 3 .6H 2 O) adding volume concentration is that in the acetic acid solution of 3%, dissolving is mixed with 6~12% ferrous chloride tetrahydrate (FeCl) that total mass volume concentration is 2 .4H 2 O) and ferric chloride hexahydrate (FeCl 3 .6H 2 O) acetic acid mixed solution, then add ferrous chloride tetrahydrate (FeCl) in the chitosan gel 2 .4H 2 O) and ferric chloride hexahydrate (FeCl 3 .6H 2 O) the acetic acid mixed solution obtains iron-doped modified chitosan solution. Ferrous chloride tetrahydrate (FeCl 2 .4H 2 O) and ferric chloride hexahydrate (FeCl 3 .6H 2 (2)...

Embodiment 1

[0029] Take by weighing 4.5g chitosan (CS) and be dissolved in 75mL volume concentration and be mixed with orange-yellow chitosan gel in 3% acetic acid solution, take by weighing 0.5g ferrous chloride tetrahydrate and 1.0g ferric trichloride hexahydrate Dissolve in 25mL acetic acid solution with a volume concentration of 3%, and prepare the acetic acid mixed solution of ferrous chloride tetrahydrate and ferric chloride hexahydrate, and then mix the acetic acid of ferrous chloride tetrahydrate and ferric chloride hexahydrate The solution is slowly added to the chitosan gel, and added while stirring to make it evenly mixed to obtain an iron-doped modified chitosan solution.

[0030] 0.45gCa(NO 3 ) 2 .4H 2 O and 0.15gKH 2 PO 4 Add to 50mL acetic acid (volume concentration is 3%) in the solution, stir to make it dissolve, blend with the above-mentioned obtained iron-doped modified chitosan solution, stir to make it fully mix, and mix with sodium hydroxide (NaOH) The pH of the...

Embodiment 2

[0033] Take by weighing 9.0g chitosan (CS) and be dissolved in 75mL volume concentration and be mixed with orange-yellow chitosan gel in 3% acetic acid solution, take by weighing 0.75g ferrous chloride tetrahydrate and 1.5g ferric chloride hexahydrate Dissolve in 25mL acetic acid solution with a volume concentration of 3%, and prepare the acetic acid mixed solution of ferrous chloride tetrahydrate and ferric chloride hexahydrate, and then mix the acetic acid of ferrous chloride tetrahydrate and ferric chloride hexahydrate The solution is slowly added to the chitosan gel, and added while stirring to make it evenly mixed to obtain an iron-doped modified chitosan solution.

[0034] 0.9gCa(NO 3 ) 2 .4H 2 O and 0.3gKH 2 PO 4 Add to 50mL acetic acid (volume concentration is 3%) in the solution, stir to make it dissolve, blend with the above-mentioned obtained iron-doped modified chitosan solution, stir to make it fully mix, and mix with sodium hydroxide (NaOH) The pH of the sol...

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Abstract

The invention discloses a preparation method and application of an iron modified chitosan hydroxyapatite composite ultrafiltration membrane. The preparation method comprises the steps of modifying chitosan hydroxyapatite by iron to obtain a novel water quality purification material with good adsorption performance on arsenic and fluoride, and blending the novel water quality purification material with a membrane casting solution taking PVDF as a matrix to obtain the iron modified chitosan hydroxyapatite composite ultrafiltration membrane. The metal cations Fe < 2 + > and Fe < 3 + > interact with oxygen elements on As (III) and As (V) oxides to form a compound which is insoluble in water or poor in water solubility so as to remove arsenic in water. Hydroxyapatite is introduced into the modified chitosan, so that the adsorption capacity to fluoride is realized. The obtained composite ultrafiltration membrane is used for purification treatment for removing arsenic, fluoride, microorganisms, silt, viruses and other indexes in underground water. Toxic indexes such as arsenic and fluoride in water can be effectively removed, suspended solids in the water body can be intercepted, the drinking water safety of human beings is guaranteed, and the prominent problem of serious shortage of water resources is solved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method and application of an iron-modified chitosan hydroxyapatite composite ultrafiltration membrane. Background technique [0002] Fluoride in groundwater mainly comes from the dissolution and release of fluorine-containing rocks in the natural environment and the discharge of industrial wastewater. The release of fluoride in the natural environment is affected by climate conditions, geological topography and runoff conditions. The concentration of fluoride in industrial wastewater The source mainly comes from the discharge of wastewater from electroplating, steel plants, coal-fired power stations, etc. Although fluorine is an essential trace element for the human body, long-term intake of excessive fluoride can cause dental fluorosis, skeletal fluorosis, and nerve damage. [0003] Arsenic pollution in water sources is mainly caused by natural emissions a...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D61/14B01D71/02B01D71/08C02F1/44C02F101/10C02F101/14
CPCB01D61/145B01D71/08B01D71/02B01D67/0011B01D67/0013B01D67/003C02F1/444C02F2101/103C02F2101/14C02F2303/04C02F2303/22
Inventor 李剑李科褡武晓张凯舟任露露姚勇靳进波
Owner GUIZHOU MATERIAL IND TECH INSTITUE