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Ceramic composite nanofiltration membrane for dye removal and preparation method thereof

A ceramic composite and nanofiltration membrane technology, applied in the field of membrane separation, can solve the problem that composite nanofiltration membrane cannot achieve efficient separation of dyes and inorganic salts, and achieves good retention effect, good solvent resistance, and improved stability.

Active Publication Date: 2020-09-18
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN105289336A discloses a method for preparing a nanofiltration separation layer by co-deposition of catechol and polyethyleneimine on the surface of an organic membrane; however, the composite nanofiltration membrane prepared by this method cannot achieve efficient separation of dyes and inorganic salts in dye wastewater

Method used

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  • Ceramic composite nanofiltration membrane for dye removal and preparation method thereof
  • Ceramic composite nanofiltration membrane for dye removal and preparation method thereof
  • Ceramic composite nanofiltration membrane for dye removal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] First, ZrO with an average pore size of 3 nm 2 The membrane was soaked in deionized water and pre-wetted for 3 h, then removed and wiped dry. Next, prepare a 50 mM trihydroxymethane solution with a pH of 8.5 at room temperature, add 2 mg / mL dopamine (DA) and 2 mg / mL polyethyleneimine with a molecular weight of 600 Da to the trihydroxymethane solution, well mixed. Soak the pre-wetted ceramic membrane in the mixed solution, shake it for 6 hours, take it out, wash and dry it; then soak it in a 0.01 M titanium tetrafluoride solution with a pH of 3 at 50 °C for 0.5 hours, take it out, wash it and dry it; then soak it In a trihydroxymethane solution (50 mM, pH 8.5) containing 2 mg / mL gallic acid for 20 min, the resulting membrane was taken out and dried to obtain a ceramic composite nanofiltration membrane.

Embodiment 2

[0052] First, SiO with an average pore size of 20 nm 2 The membrane was soaked in deionized water and pre-wetted for 3 h, then removed and wiped dry. Then configure a 50 mM trimethylol solution with a pH of 8.5 at room temperature, add 2 mg / mL of tannic acid and 2 mg / mL of polyethyleneimine with a molecular weight of 600 Da to the trimethylol solution, and mix uniform. Soak the pre-wetted ceramic membrane in the mixed solution, shake it for 6 h, take it out, wash and dry it; then soak it in 0.07 M titanium tetrafluoride solution with pH 4 at 20 °C for 1 h, take it out, wash it and dry it; then After immersing in a trihydroxymethane solution (50 mM, pH 8.5) containing 2 mg / mL gallic acid for 120 min, the obtained membrane was taken out and dried. The above is a preparation process, and the process is cyclically operated 10 times to obtain a ceramic composite nanofiltration membrane.

Embodiment 3

[0054] First, SiO with an average pore size of 5 nm 2 The membrane was soaked in deionized water and pre-wetted for 3 h, then removed and wiped dry. Next, a 50 mM trimethylol methane solution with a pH of 8.5 was prepared at room temperature, and 2 mg / mL of catechol and 2 mg / mL of polyethyleneimine with a molecular weight of 600 Da were added to the trimethylol methane solution, well mixed. Soak the pre-wetted ceramic membrane in the mixed solution, shake it for 6 h, take it out, wash and dry; then soak it in 0.04 M titanium tetrafluoride solution with pH 5 at 70 ℃ for 3 h, take it out, wash and dry; then After immersing in a trihydroxymethane solution (50 mM, pH 8.5) containing 2 mg / mL gallic acid for 5 min, the obtained membrane was taken out and dried. The above is a preparation process, and the process is cyclically operated 4 times to obtain a ceramic composite nanofiltration membrane.

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Abstract

The invention relates to a preparation method of a ceramic composite nanofiltration membrane for dye removal, and belongs to the field of membrane separation. A tubular or flaky ceramic substrate is used as a carrier, a dopamine compound and polyethyleneimine form a co-deposition layer on the surface of the carrier, TiO2 is loaded on the co-deposition layer, and finally, gallic acid is used for crosslinking to obtain the composite nanofiltration membrane. The preparation process is simple, the reaction conditions are mild, and the prepared ceramic composite nanofiltration membrane is high in mechanical strength, good in stability, large in permeation flux and high in rejection rate, is suitable for removal of dyes in wastewater and is also suitable for removal of dyes in organic solvents.

Description

technical field [0001] The invention relates to a preparation method of a ceramic composite nanofiltration membrane, in particular to a co-deposited layer constructed of dopamine compounds and polyethyleneimine to chelate TiO produced by the hydrolysis of titanium tetrafluoride 2 , and then cross-linked with gallic acid to obtain a ceramic composite nanofiltration membrane for dye removal, which belongs to the field of membrane separation. Background technique [0002] The textile industry produces a large amount of high-salinity dye wastewater every year, which is characterized by high toxicity, complex components, and difficult treatment. Conventional dye wastewater treatment methods include flocculation precipitation, adsorption, biodegradation, and advanced oxidation processes, all of which have certain limitations. The flocculation precipitation method can achieve a certain decolorization effect, but it can only work on some dyes. The adsorbent is also selective to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/60B01D69/12B01D67/00B01D61/00
CPCB01D71/60B01D71/024B01D69/125B01D67/0079B01D67/0093B01D61/027Y02A20/131
Inventor 高能文张燕梁富杰王洪毕亚非
Owner CHONGQING UNIV OF TECH
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