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Preparation method of perfluorooctanoic acid molecularly imprinted adsorbent on porous ceramic surface

A porous ceramic, perfluorooctanoic acid technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of reducing the utilization rate of imprinting sites, uneven distribution of imprinting sites, template leakage mechanical properties, etc. problems, to achieve the effects of excellent mechanical stability, more connection and adsorption sites, and good physical and chemical stability

Inactive Publication Date: 2019-03-15
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device required by this method is simple and universal, but there are usually the following problems: (1) The controllability is poor during the grinding process, and some irregular particles are inevitably generated, and some imprinted spots are destroyed at the same time
The qualified particles obtained after sieving are generally less than 50%, resulting in obvious waste; (2) there are too deep embedding of template molecules, difficulty in elution, template leakage and low mechanical properties; (3) uneven distribution of imprinted sites , some of them are located above the particle pores, and their mass transfer rate is faster, while others are embedded in the polymer body, which is affected by steric hindrance, has poor accessibility, and the rate of recombining template molecules is slow, thereby reducing the number of imprinted sites. Utilization of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of porous ceramics: In the grinder, add ceramic powder: 42g, clay: 42g, carbon powder: 8g, solid epoxy resin: 8g, turn on the grinder, grind for 30 min, take it out and put it in an oven at 110°C , dried for 10 h, then placed in a high-temperature furnace at 950 ° C for 5 h, cooled to room temperature, and ground to powder to obtain porous ceramic powder with a particle size between 60 and 80 mesh;

[0024] (2) Preparation of epoxylated porous ceramics: add ethanol: 75 mL, γ-(2,3-glycidoxy) propyltrimethoxysilane: 28 g, porous ceramic powder: 14 g in the reactor , at a constant temperature of 58±2°C, stirring, and reflux reaction for 5 h. After the reaction, the solid-liquid separation was performed, washed with ethanol, and dried to obtain epoxy-based porous ceramic powder;

[0025] (3) Preparation of perfluorooctanoic acid molecularly imprinted adsorbent on porous ceramic surface: In the reactor, add deionized water: 56 mL, maleimide: 12 g, itaconic ac...

Embodiment 2

[0027] (1) Preparation of porous ceramics: In the grinder, add ceramic powder: 40g, clay: 44g, carbon powder: 6g, solid epoxy resin: 10g, turn on the grinder, grind for 30 min, take it out and place it in an oven at 110°C , dried for 10 h, then placed in a high-temperature furnace at 950 ° C for 5 h, cooled to room temperature, and ground to powder to obtain porous ceramic powder with a particle size between 60 and 80 mesh;

[0028](2) Preparation of epoxylated porous ceramics: add ethanol: 76 mL, γ-(2,3-glycidoxy) propyltrimethoxysilane: 25 g, porous ceramic powder: 15 g in the reactor , at a constant temperature of 58±2°C, stirred, and refluxed for 5 h. After the reaction, the solid and liquid were separated, washed with ethanol, and dried to obtain epoxy-based porous ceramic powder;

[0029] (3) Preparation of perfluorooctanoic acid molecularly imprinted adsorbent on porous ceramic surface: In the reactor, add deionized water: 53 mL, maleimide: 15 g, itaconic acid: 18 g, pe...

Embodiment 3

[0031] (1) Preparation of porous ceramics: In the grinder, add ceramic powder: 44g, clay: 40g, carbon powder: 10g, solid epoxy resin: 6g, turn on the grinder, grind for 30 min, take it out and place it in an oven at 110°C , dried for 10 h, then placed in a high-temperature furnace at 950 ° C for 5 h, cooled to room temperature, and ground to powder to obtain porous ceramic powder with a particle size between 60 and 80 mesh;

[0032] (2) Preparation of epoxylated porous ceramics: add ethanol: 70 mL, γ-(2,3-glycidoxy) propyltrimethoxysilane: 26 g, porous ceramic powder: 18 g in the reactor , at a constant temperature of 58±2°C, stirred, and refluxed for 5 h. After the reaction, the solid and liquid were separated, washed with ethanol, and dried to obtain epoxy-based porous ceramic powder;

[0033] (3) Preparation of perfluorooctanoic acid molecularly imprinted adsorbent on the surface of porous ceramics: In the reactor, add deionized water: 60mL, maleimide: 10g, itaconic acid: 1...

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Abstract

The invention discloses a preparation method of a porous ceramic surface perfluorooctanoic acid molecular imprinting adsorbent. The preparation method is characterized in that porous ceramic powder is used as a support of an adsorbent. The preparation method comprises adding 53 to 60% by mass of deionized water, 10 to 15% by mass of maleimide, 13 to 18% by mass of itaconic acid, 1.0 to 2.0% by mass of perfluorooctanoic acid, 10 to 15% by mass of epoxidized porous ceramic powder and 1.0 to 3.0% by mass of ammonium persulfate into a reactor, feeding nitrogen gas for 10min to remove oxygen, stirring the materials in an oxygen-free atmosphere at a temperature of 45+ / -2 DEG C for 12h, stirring to wash the product through a mixed solution of ethanol and sodium hydroxide for 10h so that a template molecule is removed and carrying out drying to obtain the porous ceramic surface perfluorooctanoic acid molecular imprinting adsorbent. The adsorbent has ability to specifically recognize perfluorooctanoic acid, has good selectivity and good mechanical properties, has good chemical stability and a fast adsorption speed, is easy to elute and has a regenerative capacity.

Description

technical field [0001] The invention relates to a preparation method and application technology of a molecularly imprinted adsorption material, in particular to a preparation method of a perfluorooctanoic acid molecularly imprinted adsorbent on a porous ceramic surface, which belongs to the technical field of separation material application. Background technique [0002] Perfluorooctanoic acid (PFOA), or "C8", is a synthetic chemical often used as an integral processing aid in the production of high-performance fluoropolymers. These high-performance fluoropolymers can be widely used in aerospace technology, transportation, electronics industry, and household products such as kitchen utensils (such as non-stick pans). Since the early 1980s, the application of this non-volatile perfluorinated organic compound in industrial and civil fields has grown rapidly. The extensive use of this type of product makes it enter various environmental media such as soil, water, and the atmos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C08F222/02C08F222/40C08J9/26C02F1/28C02F101/34C02F101/36
CPCB01J20/103B01J20/20B01J20/268C02F1/281C02F1/283C02F1/285C02F2101/34C02F2101/36C08F222/02C08J9/26C08J2201/0424C08J2335/00C08F222/40
Inventor 李慧芝李志英许崇娟
Owner UNIV OF JINAN
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