Preparation method of cellulose acetate-based composite membrane and application of cellulose acetate-based composite membrane in dynamic separation and extraction of tellurium

A technology of cellulose acetate and composite membrane, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of difficult and efficient separation and recovery, low separation efficiency, etc., and achieve low cost and high separation efficiency , the effect of simple operation

Pending Publication Date: 2021-11-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, membrane separation technology is an environmentally friendly, economical, and easy-to-operate tellurium extraction technology, but the separation efficiency of a single membrane is not high, and it is difficult to achieve efficient separation and recovery of tellurium in tellurium-containing waste liquid

Method used

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  • Preparation method of cellulose acetate-based composite membrane and application of cellulose acetate-based composite membrane in dynamic separation and extraction of tellurium

Examples

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Embodiment 1

[0025] A preparation method of cellulose acetate-based composite film, comprising the steps of:

[0026] a) Mix magnesium chloride, sodium carbonate and water in a molar volume ratio of 1:1:50 (mol / mL), add them to a polytetrafluoroethylene-lined autoclave, and conduct a hydrothermal reaction at 80°C for 10 hours, Cool, wash with distilled water and ethanol for 3 times, dry at 60°C for 12 hours, and calcinate at 500°C for 1 hour to obtain magnesium oxide microspheres;

[0027] b), the mass ratio of magnesium oxide microspheres to cellulose acetate is 1:20, the mass ratio of polyvinylpyrrolidone to cellulose acetate is 1:4, and the mass ratio of cellulose acetate to polyethylene glycol is 1:10, Mix magnesium oxide microspheres, cellulose acetate, polyvinylpyrrolidone, and polyethylene glycol at a volume ratio of 1:15 (g / mL) between the mass of cellulose acetate and solvent, stir at 50°C for 8 hours, let stand and cool, and 4mL of the mixed solution was cast on a glass plate an...

Embodiment 2

[0030] A preparation method of cellulose acetate-based composite film, comprising the steps of:

[0031] a) Mix magnesium nitrate, sodium acetate and water at a molar volume ratio of 1:1:50 (mol / mL), add them to a polytetrafluoroethylene-lined autoclave, and conduct a hydrothermal reaction at 70°C for 12 hours , cooled, washed with distilled water and ethanol for 3 times, dried at 70°C for 6 hours, and calcined at 600°C for 2 hours to obtain the magnesium oxide superstructure.

[0032] b), the mass ratio of magnesium oxide superstructure and cellulose acetate is 1:4, the mass ratio of polyvinylpyrrolidone and cellulose acetate is 1:2, and the mass ratio of cellulose acetate and polyethylene glycol is 1:10, Mix magnesium oxide superstructure, cellulose acetate, polyvinylpyrrolidone, and polyethylene glycol according to the volume ratio of the mass of cellulose acetate to the solvent of 1:15 (g / mL), stir at 50°C for 8h, let stand and cool, and 4mL of the mixed solution was cast...

Embodiment 3

[0034] A preparation method of cellulose acetate-based composite film, comprising the steps of:

[0035] a) Mix zirconium nitrate, urea and water at a molar volume ratio of 1:1:80 (mol / mL), add them to a polytetrafluoroethylene-lined autoclave, and conduct a hydrothermal reaction at 70°C for 8 hours. Cool, wash with distilled water and ethanol for three times, dry at 60°C for 12 hours, and calcinate at 600°C for 5 hours to obtain zirconia microspheres.

[0036] b), the mass ratio of zirconia microspheres to cellulose acetate is 1:4, the mass ratio of polyvinylpyrrolidone to cellulose acetate is 1:4, and the mass ratio of cellulose acetate to polyethylene glycol is 1:10, Mix zirconia microspheres, cellulose acetate, polyvinylpyrrolidone, and polyethylene glycol at a volume ratio of 1:15 (g / mL) between the mass of cellulose acetate and solvent, stir at 50°C for 8 hours, let stand and cool, and 5mL of the mixed solution was cast on a glass plate and immersed in deionized water t...

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Abstract

The invention belongs to the field of chemical separation, and relates to a preparation method of a cellulose acetate-based composite membrane. The method comprises the steps of preparing a metal salt and a precipitant into a solution according to a molar volume ratio of the metal salt to the precipitant to water being 1 mol: (1-2) mol: (50-80) mL, carrying out a hydrothermal reaction at the temperature of 70-150 DEG C for 8-12 h, cooling to room temperature, carrying out precipitate centrifugal washing, drying at the temperature of 60-80 DEG C for 5-12 h, and calcining in air at the temperature of 300-600 DEG C for 1-5 h; and then mixing the metal oxide, cellulose acetate, polyvinylpyrrolidone and polyethylene glycol, stirring at the temperature of 50-80 DEG C for 4-9 hours, standing and cooling, casting the mixed solution on the surface of a glass plate, and immersing the glass plate into a non-solvent, thereby obtaining the product. The prepared composite membrane is applied to dynamic separation and recovery of tellurium in a tellurium-containing solution. The preparation method disclosed by the invention is low in cost and simple to operate, and the obtained composite membrane has high separation efficiency, circularity, pollution resistance and stability, is applied to the field of chemical separation, and has important significance on recycling of scattered element resources and environmental protection.

Description

technical field [0001] The invention belongs to the field of chemical separation and relates to the separation and recovery of scattered metal elements, in particular to a preparation method of a cellulose acetate-based composite membrane and its application to dynamic separation and extraction of tellurium. Background technique [0002] Tellurium is an important semiconductor material with unique optical, electrical and thermal properties. Tellurium and its compounds are widely used in modern high-tech industries, national defense and cutting-edge technology fields. For example, high-purity tellurium can be used to make thermoelectric electrodes; super Pure tellurium single crystals can be used in infrared detectors; especially in the past decade, cadmium telluride solar thin-film solar cells, as one of the most promising solar technologies, have been consuming scarce tellurium resources in more and more applications. At present, the main source of tellurium is the anode sl...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D71/02B01D69/12B01D69/02B01D67/00B01D61/00C01B19/00
CPCB01D71/16B01D71/024B01D69/12B01D69/125B01D69/02B01D67/0079B01D61/00C01B19/008
Inventor 邵雪张涛邱凤仙姚广磊邱智伟徐吉成
Owner JIANGSU UNIV
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