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Preparation method of ceramic microfiltration membrane by using attapulgite nano fibers as separating layer

A nanofiber, attapulgite technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of high preparation cost, difficult preparation and high cost, and achieve low price and high permeability. Throughput, the effect of reducing the preparation cost

Active Publication Date: 2013-03-27
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the nanofiber materials for the preparation of ceramic fiber membranes reported in the literature are all artificially synthesized, which is difficult to prepare, high in cost, and difficult to disperse, which will inevitably lead to high membrane preparation costs.

Method used

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  • Preparation method of ceramic microfiltration membrane by using attapulgite nano fibers as separating layer
  • Preparation method of ceramic microfiltration membrane by using attapulgite nano fibers as separating layer

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: Preparation of attapulgite / alumina microfiltration membrane

[0025] Add 0.3g of attapulgite nanofibers with a diameter of 30-40nm and a length of about 0.5-1μm into 299.07g of water and mix well, then add 0.3g of polyethyleneimine, 0.3g of methylcellulose, and 0.03g of silicone defoamer in sequence, After high-speed stirring and ultrasonic dispersion, the coating liquid was prepared; the film was coated on a tubular alumina porous support with an average pore size of 4 microns, and dried in a hot air drying oven at 70°C for 24 hours; ℃ / min to 300°C, hold for 3 hours, 2°C / min to 400°C, hold for 6 hours, and cool down naturally in the furnace to obtain the attapulgite / alumina microfiltration membrane. from figure 1 (SEM) It can be seen from the photo that the thickness of the separation layer on the support is 5 μm, the membrane pore size is 100 nm, the separation layer completely covers the transition layer, the thickness is uniform, the surface is complete...

Embodiment 2

[0026] Embodiment 2: Preparation of attapulgite / stainless steel microfiltration membrane

[0027] Add 22.65g of attapulgite nanofibers with a diameter of 40-60nm and a length of about 1-2μm into 266.385g of water and mix thoroughly, then add 2.55g of polyacrylic acid, 7.65g of carboxymethyl cellulose, and 0.765g of silicone defoamer. High-speed stirring and ultrasonic dispersion to prepare the coating liquid; coating the film on a tubular stainless steel porous carrier with an average pore size of 5 microns, drying it in a hot air drying oven at 90°C for 17 hours; Raise the temperature to 350°C, keep it warm for 1.5h, then raise the temperature to 600°C at 1°C / min and keep it warm for 3.5h, then cool down naturally in the furnace to obtain attapulgite / stainless steel microfiltration membrane. The separation layer has a thickness of 1 μm and a pore diameter of 200 nm.

Embodiment 3

[0028] Example 3: Preparation of Attapulgite / Titanium Aluminum Alloy Microfiltration Membrane

[0029] Add 45g of attapulgite nanofibers with a diameter of 60-80nm and a length of about 2-3μm into 60g of water and mix thoroughly, then add 30g of polyethylene glycol, 150g of polyvinyl alcohol, and 15g of silicone defoamer in sequence, after high-speed stirring and ultrasonic dispersion Prepare the coating solution; coat the film on a sheet-type titanium-aluminum alloy porous carrier with an average pore size of 10 microns, dry it in a hot air drying oven at 110°C for 10 hours; then raise the temperature to 400°C at 5°C / min in a high temperature furnace ℃, hold for 0.5h, raise the temperature to 800°C for 1h at 1°C / min, cool down naturally in the furnace, and obtain the attapulgite / titanium aluminum alloy microfiltration membrane. The separation layer has a thickness of 20 μm and a pore diameter of 400 nm.

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Abstract

The invention discloses a preparation method of a ceramic microfiltration membrane by using attapulgite nano fibers as a separating layer, which is characterized by comprising the steps of: A, dispersing the attapulgite nano fibers in deionized water, adding a dispersing agent, a thickening agent and a defoaming agent to prepare a membrane solution; B, coating a membrane on a porous support body, and airing the wet membrane and drying; and C, roasting at a temperature of 400-800 DEG C for 1-6h, and naturally cooling to obtain a dual-layer ceramic microfiltration membrane. A separation layer of the ceramic microfiltration membrane consists of the attapulgite nano fibers. When a sieve mesh structure is formed, in the attapulgite nano fibers, macropores are separated into micropores to form communicated pore canals, thus the special nano fiber structure of the attapulgite is fully developed, larger total porosity and circulating pores are provided, and high penetration flux is maintained while high selectivity is obtained.

Description

technical field [0001] The invention relates to a preparation method of a ceramic microfiltration membrane, in particular to a preparation method of a ceramic microfiltration membrane using attapulgite nanofibers as a separation layer. Background technique [0002] Membrane technology is a new type of high-efficiency separation technology. With its energy-saving and environment-friendly features, it has become one of the common supporting technologies to solve major problems faced by human beings in the fields of energy, water resources, and environment. It has been highly valued by governments of all countries. Membrane separation technology has been successfully applied in chemical, petrochemical, pharmaceutical, biochemical and other process industries, and it also plays a very important role in energy saving, clean production and circular economy. [0003] Membrane materials are the core of membrane technology. At present, the membrane materials that can be applied in i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/10
Inventor 周守勇赵宜江薛爱莲李梅生张艳褚效中范益群邢卫红
Owner HUAIYIN TEACHERS COLLEGE
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