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Asymmetric-structure in-situ ultrasonic anti-pollution membrane with piezoelectric material as support body and preparation method thereof

An asymmetric structure, piezoelectric material technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of slowing down the phenomenon of concentration polarization, slowing down accumulation, and ensuring accuracy

Active Publication Date: 2017-06-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the existing in-situ vibration anti-pollution membranes are all symmetrical structures, in order to improve the separation performance and permeability of the vibration membrane, it is necessary to prepare an in-situ ultrasonic membrane with an asymmetric structure

Method used

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  • Asymmetric-structure in-situ ultrasonic anti-pollution membrane with piezoelectric material as support body and preparation method thereof
  • Asymmetric-structure in-situ ultrasonic anti-pollution membrane with piezoelectric material as support body and preparation method thereof
  • Asymmetric-structure in-situ ultrasonic anti-pollution membrane with piezoelectric material as support body and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Alumina in-situ ultrasonic microfiltration membrane supported by porous lead zirconate titanate and its preparation

[0029] The lead zirconate titanate powder (particle size 6-10um) is dry-pressed and calcined at 1200° C. for 4 hours to prepare a sheet-type porous lead zirconate titanate support body with an average pore diameter of 3000 nm. Disperse 15g of alumina (particle size 2-3um) in 100g of water, add 0.7g of nitric acid as a dispersant, and 0.5g of hydroxymethylcellulose, and disperse evenly to prepare a film-forming solution with a mass solid content of 15%. Coating on the surface of the lead zirconate titanate support for 3 minutes, raising the temperature of the wet film to 120°C and drying it in a hot air drying oven for 12 hours, then heating the dried film to 1050°C in the air, and calcining it for 4 hours to prepare a The average pore size of the layer structure is a microfiltration membrane of 1000nm. The asymmetric membrane was subjected to...

Embodiment 2

[0030] Example 2: Zirconia in-situ ultrasonic microfiltration membrane supported by porous lead zirconate titanate and its preparation

[0031] On the basis of the alumina microfiltration membrane with an average pore size of 1000nm prepared in Example 1, 20g of zirconia powder (particle size of 300nm) was dispersed in 100g of aqueous solution, 1g of polyethyleneimine was added as a dispersant, and 1.3g of ethylene glycol was added. Alcohol is used as a thickener, dispersed evenly to prepare a film-making solution with a mass solid content of 20%, coated on the surface of 1000nm alumina for 1min, and the wet film was heated to 100°C and dried in a hot air drying oven for 20 hours, and then dried The dried membrane was heated to 800° C. in air, and calcined for 1 hour to prepare a zirconia microfiltration membrane with a three-layer structure and an average pore diameter of 100 nm. The asymmetric membrane was subjected to high-voltage polarization in an air environment of 150° ...

Embodiment 3

[0032] Example 3: Silicon oxide in-situ ultrasonic ultrafiltration membrane with porous lead zirconate titanate as support and its preparation

[0033]On the basis of the zirconia with an average pore size of 100nm prepared in Example 2, 15g of silicon oxide powder (30nm in particle size) was dispersed in 100g of deionized water, 1g of nitric acid was added as a dispersant, and 1.2g of polyvinyl alcohol was used as a thickener. Disperse evenly to prepare a membrane-forming solution with a mass solid content of 15%. Coat the surface of 100nm zirconia microfiltration membrane for 30s, raise the temperature of the wet membrane to 70°C and dry it in a hot air drying oven for 20 hours, then raise the temperature of the dried membrane to 700°C in the air, and calcinate it for 2 hours to prepare the four A silicon oxide ultrafiltration membrane with an average pore size of 10 nm in layer structure. The asymmetric membrane was subjected to high-voltage polarization in an insulating s...

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Abstract

The invention relates to an asymmetric-structure in-situ ultrasonic anti-pollution membrane with a piezoelectric material as a support body. The membrane is characterized in that the support body is a porous piezoelectric ceramic with an average pore size of 100 to 3000 nm; and a separating layer is a porous inorganic film with an average pore size distribution of 1 to 1000 nm. The preparation method comprises the following steps: preparing the ceramic support body with a porous structure from piezoelectric ceramic powder and preparing the porous inorganic separating layer on the surface of the ceramic support body; subjecting a wet membrane to air-drying, stoving, calcining and natural cooling successively so as to prepare an asymmetric-structure membrane; and subjecting the asymmetric-structure membrane to high-voltage polarization so as to obtain the asymmetric-structure in-situ ultrasonic anti-pollution membrane. The pore size of the separating film prepared in the invention is adjustable in a range of 1 to 1000 nm so as to meet demands of different separation systems; meanwhile, the piezoelectric support body can generate ultrasonic vibration in the process of separating, so substantial anti-pollution effect is obtained.

Description

technical field [0001] The invention relates to an in-situ ultrasonic anti-pollution membrane and a preparation method thereof, in particular to an asymmetric structure in-situ ultrasonic anti-pollution membrane with a piezoelectric material as a support body and a preparation method thereof. Background technique [0002] Membrane separation technology uses selective permeable membrane as the separation medium. By applying a certain driving force on both sides of the membrane, the components on the raw material side are selectively permeated through the membrane to achieve the purpose of separation and purification. It has the advantages of no phase change, low energy consumption, high efficiency, and simple process, and the inorganic membrane has the advantages of acid and alkali corrosion resistance, organic solvent resistance, high temperature and high pressure resistance, etc., so it has very broad application prospects. However, membrane fouling is a common problem face...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/02
CPCB01D67/0046B01D69/02B01D71/024
Inventor 邱鸣慧范益群毛恒洋邹栋
Owner NANJING UNIV OF TECH
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