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Anionic dye desalting ceramic composite membrane preparation method

An anionic dye, ceramic composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex preparation and low removal rate, and achieve simple process, good permeability, operation easy effect

Active Publication Date: 2015-08-26
NANJING UNIV OF TECH
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of low removal rate of divalent ions by traditional nanofiltration membranes and complicated preparation of traditional composite ultrafiltration membranes in the process of dye desalination, and provide a method for preparing ceramic composite membranes for anionic dye desalination, The preparation process is simple, and it can effectively remove monovalent and divalent inorganic salts while retaining dyes

Method used

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  • Anionic dye desalting ceramic composite membrane preparation method
  • Anionic dye desalting ceramic composite membrane preparation method
  • Anionic dye desalting ceramic composite membrane preparation method

Examples

Experimental program
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Embodiment 1

[0028] Step 1: Membrane tube pretreatment. Wash the tubular ceramic ultrafiltration membrane (titanium oxide single-tube membrane, its PEG molecular weight cut-off is 1800, and the pore size is 2.2nm), remove the impurities on the surface of the membrane and in the pores, and then dry it;

[0029] Step 2: Preparation of silane coupling agent solution. Dissolve (3-mercaptopropyl)trimethoxysilane in ethanol at a concentration of 0.05mol / L, add acetic acid as a hydrolysis catalyst, adjust the pH to 3.5, and mix and stir at room temperature;

[0030] Step 3: silanization reaction. Soak the pretreated tubular ceramic ultrafiltration membrane in the stirred reaction solution, take it out after reacting in a constant temperature oscillator at 35°C for 10 hours, and put it in an oven at 110°C to dry for 3 hours after cleaning;

[0031] Step 4: mercapto oxidation reaction. Soak the tubular ceramic ultrafiltration membrane in 4% hydrogen peroxide, oxidize it for 6 hours, take it out,...

Embodiment 2

[0038] Step 1: Membrane tube pretreatment. Wash the tubular ceramic ultrafiltration membrane (titanium oxide single-tube membrane, its PEG molecular weight cut-off is 2200, and the pore size is 2.4nm), remove the impurities on the surface of the membrane and in the pores, and then dry it;

[0039] Step 2: Preparation of silane coupling agent solution. Dissolve 2-mercaptoethyltriethoxysilane in ethanol at a concentration of 0.08mol / L, add hydrochloric acid as a hydrolysis catalyst, adjust the pH value to 4, and mix and stir at room temperature;

[0040] Step 3: silanization reaction. Soak the pretreated tubular ceramic ultrafiltration membrane in the stirred reaction solution, react in a constant temperature oscillator at 45°C for 10 hours, take it out, clean it and put it in an oven at 120°C to dry for 2 hours;

[0041] Step 4: mercapto oxidation reaction. Soak the tubular ceramic ultrafiltration membrane in 3% hydrogen peroxide, oxidize it for 9 hours, take it out, wash an...

Embodiment 3

[0046] Step 1: Membrane tube pretreatment. Wash the tubular ceramic ultrafiltration membrane (zirconia single-tube membrane, its PEG molecular weight cut-off is 1900, and the pore size is 2.3nm), and then dry it after removing impurities on the surface of the membrane and in the pores;

[0047] Step 2: Preparation of silane coupling agent solution. Dissolve (3-mercaptopropyl)trimethoxysilane in ethanol at a concentration of 0.06mol / L, add acetic acid as a hydrolysis catalyst, adjust the pH to 5, and mix and stir at room temperature;

[0048] Step 3: silanization reaction. Soak the pretreated tubular ceramic ultrafiltration membrane in the stirred reaction solution, react in a constant temperature oscillator at 60°C for 8 hours, take it out, and put it in an oven at 130°C to dry for 1 hour after cleaning;

[0049] Step 4: mercapto oxidation reaction. Soak the tubular ceramic ultrafiltration membrane in 3% hydrogen peroxide, oxidize it for 8 hours, take it out, wash and dry i...

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Abstract

The invention relates to anionic dye desalting ceramic composite membrane preparation method. The specific steps are as follows: first, a pretreated ceramic ultrafiltration membrane is soaked in a silane coupling agent alcohol solution for silanization reaction, so that the membrane surface is covalently bonded with sulfhydryl group, the sulfhydryl group is oxidized by hydrogen peroxide so as to obtain a modified ceramic ultrafiltration membrane with sulfonic group on the surface. The preparation method adopts one-step grafting method, and is less in consumables, and easy to operate. The preparation method aims at the shortcoming that dye entrapment efficiency of a conventional ultrafiltration membrane is not high, improves the dye especially anionic dye entrapment rate by charge modification of ceramic ultrafiltration membranes with the pore size in 2-4 nm, but also can ensure higher monovalent and bivalent inorganic salt transmittance, so that the ceramic composite ultrafiltration membrane can be applied to dye desalting.

Description

technical field [0001] The invention relates to a preparation method of a ceramic composite membrane used for anionic dye desalination, and belongs to the field of separation membrane preparation technology and application. Background technique [0002] my country is the largest producer and consumer of dyestuffs in the world. Most domestic dyestuff manufacturers use traditional production techniques to produce dyestuffs. The dyestuff products contain high salt content and cannot meet the needs of the market in terms of variety, quality, output, and technology. . Moreover, the energy consumption in the production process is high, and a large amount of high-color, high-COD saline wastewater will be discharged, which seriously pollutes the environment. Therefore, efficient purification of dyes and removal of salt in dyes is a major problem that plagues the product quality of the dye industry, and it is also a research direction that people focus on. As a clean production proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00
Inventor 景文珩丁丹丹邢卫红徐南平
Owner NANJING UNIV OF TECH
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