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Preparation method and application of nano MFe2O4 supported hollow fiber composite ceramic membrane with catalytic separation function

A fiber composite and ceramic membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, water/sludge/sewage treatment, etc., can solve problems such as high energy consumption, single separation function, etc., to improve effluent water quality and reduce membrane Pollution, good anti-pollution performance

Active Publication Date: 2017-09-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of membrane fouling, single separation function and high energy consumption in the operation of the membrane process. Starting from the characteristics of strong mechanical properties and oxidation resistance of the ceramic membrane, it loads the membrane surface and the pore wall by using the dipping-coating method. Spinel is used as a catalyst, and the in-situ coupled sulfuric acid radical advanced oxidation process (SR-AOPS) realizes anti-pollution and catalytic degradation of pollutants in a gravity-driven low-energy membrane process

Method used

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  • Preparation method and application of nano MFe2O4 supported hollow fiber composite ceramic membrane with catalytic separation function
  • Preparation method and application of nano MFe2O4 supported hollow fiber composite ceramic membrane with catalytic separation function
  • Preparation method and application of nano MFe2O4 supported hollow fiber composite ceramic membrane with catalytic separation function

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Preparation of composite membrane carrier hollow fiber alumina ceramic membrane

[0040] Load CoFe 2 O 4 The carrier membrane used in the hollow fiber composite ceramic membrane is alumina hollow fiber ceramic membrane. The specific preparation steps are as follows:

[0041] The first step: casting film slurry configuration

[0042] According to the composition of the casting film slurry is α-Al 2 O 3 :PESf: NMP: PVP=50:9.8:39.2:3 (wt%) Weigh the raw materials, the total weight is 200g, and weigh 1.25 times the powder mass of different particle size zirconia pellets, add it to the organic matter, 380 Ball mill uniform organic matter at revolutions / min for 6 hours, then add the ceramic powder in 2-3 batches to the uniformly mixed organic solvent and ball mill for 48 hours to obtain a uniform casting film slurry.

[0043] The second step: treatment of casting film slurry

[0044] Pour the uniformly ball-milled casting film slurry on a 200 mesh gauze to separate the zirc...

Embodiment 2

[0050] Example 2: Load CoFe 2 O 4 Of hollow fiber composite ceramic membrane

[0051] Load CoFe 2 O 4 The hollow fiber composite ceramic membrane of the hollow fiber composite ceramic membrane uses hollow fiber alumina as the carrier, and uses the citric acid-stabilized metal nitrate salt solution as the impregnating mother liquor, and is calcined in a low-temperature muffle furnace to phase the catalyst and strengthen the bonding strength with the carrier membrane. The specific steps are as follows:

[0052] Step 1: Preparation of citric acid stabilized metal nitrate catalyst mother liquor

[0053] According to the molar ratio of 1:2:3, weigh 10mmol, 20mmol and 30mmol of cobalt nitrate, ferric nitrate and citric acid, and add the metal salt to a beaker containing 50ml of pure water. Add the citric acid to the same volume of pure water. Place the beaker containing the citric acid solution in the water bath and heat to 60 o C. Add the metal mixed salt solution dropwise to the citric a...

Embodiment 3

[0059] Example 3: Load CoFe under gravity drive 2 O 4 Hollow fiber composite ceramic membrane coupled with SR-AOPS to remove low-concentration methyl blue dye wastewater application

[0060] The steps for removing methyl blue from the composite membrane under gravity drive are as follows:

[0061] The first step: Weigh methyl blue and configure it into an aqueous solution with a concentration of 25mg / L as simulated dye wastewater;

[0062] Step 2: Load the membrane into the gravity-driven membrane module, and let the methyl blue solution act on gravity for 10 minutes to achieve adsorption and desorption equilibrium;

[0063] The third step: Weigh potassium hydrogen persulfate and add it to the methyl blue solution to make the concentration 1.0g / L, the pH of the solution is not adjusted, and replace the composite membrane contact solution with the target concentration of methyl blue and persulfuric acid Hydrogen potassium mixed solution, carry out experiments at different water levels;...

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Abstract

The invention relates to a preparation method and application of a nano MFe2O4 supported hollow fiber composite ceramic membrane having catalytic separation function, pollution resistance and low energy consumption, and belongs to the field of application of inorganic ceramic membranes in water treatment. A hollow fiber ceramic membrane is used as a support, stable nitric metal salt of citric acid is used as a catalyst mother liquid, and dipping and temperature calcining process is performed to prepare the nano MFe2O4 supported hollow fiber composite ceramic membrane. In in-situ coupling with the sulfuric free radical advanced oxidation technique, the nano MFe2O4 supported hollow fiber composite ceramic membrane can be applied to the treatment of low-concentration organic wastewater, such as dye wastewater and medicine and personal nursing product wastewater, in order to efficiently remove typical contaminants, such as methyl blue, rhodamine B and ibuprofen drugs, with the removal rate stilling being 91.8% and above in 55-60 min while methyl blue wastewater concentration is < / =25 mg / L and water level is 30 cm (2.94 kPa); similarly, the removal rate of rhodamine B is 90.7%; after 1 h of operation, when ibuprofen wastewater concentration is < / =10 Mu mol / L, the removal rate of ibuprofen is kept to 99.5% and above.

Description

Technical field [0001] The invention relates to the application field of inorganic ceramic membrane water treatment, in particular to a preparation method of a composite ceramic membrane with catalytic separation function and low energy consumption operation characteristics, and the application of the prepared composite membrane to remove low-concentration organic wastewater in a gravity-driven membrane process . Background technique [0002] my country is a traditional printing, dyeing and textile country, and the total amount of waste water discharged into water bodies every year is huge. According to reports, in 2010, my country’s dye production reached 756,000 tons, accounting for about 60% of the world’s total dye production, ranking first in the world; in my country’s dye industry production, about 744m of wastewater is discharged for every ton of dye produced. 3 , Along with about 10%-20% of the dyes are released into the water body, according to the total production of dy...

Claims

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Application Information

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IPC IPC(8): B01D63/02B01D69/12B01D67/00C02F1/44C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01D63/02B01D67/0004B01D67/0088B01D69/12B01D69/122B01D2311/2696B01D2323/46C02F1/44C02F2101/30C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 董应超李友铃邓志毅杨凤林
Owner DALIAN UNIV OF TECH
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