Preparation method and application of a dynamic membrane for selective oil-water separation

An oil-water separation and dynamic membrane technology, which is applied in the field of oil-water separation membrane and the preparation of selective oil-water separation dynamic membrane, can solve the problems of pollution and poor wetting selectivity, and achieve the effect of extending the application range, prolonging the service life and saving energy.

Inactive Publication Date: 2020-02-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the present invention, the porous net membrane is used as the base membrane, and the micro-nano structure zinc oxide is used as the secondary membrane to construct a dynamic oil-water separation membrane, and the regeneration of the dynamic layer is used to effectively solve the membrane pollution problem in the oil-water separation process
The present invention utilizes the influence of the surface-related defects of pre-coated zinc oxide to remove oxygen defects in a hydrogen atmosphere or obtain oxygen defects in an oxygen atmosphere to obtain super-hydrophobic and super-hydrophilic surfaces respectively, which solves the problem of preparing oil-water separation membranes in the prior art The disadvantage of poor wetting selectivity of the material expands the application range of oil-water separation membrane materials in oil-water separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a selective oil-water separation dynamic membrane, comprising:

[0024] a) Add 0.1mol of zinc acetate to 100mL of absolute ethanol, stir vigorously until dissolved, and reflux the resulting zinc acetate ethanol solution at 60°C for 3 hours to obtain a milky white zinc sol;

[0025] b) Soak a 10 cm2 silica fiber film in 50 mL of zinc sol for 10 seconds, dry at 60°C for 20 minutes, repeat soaking 5 times, and anneal at 350°C for 15 minutes to obtain silica fibers coated with zinc oxide seeds membrane;

[0026] c) Prepare 80 mL of a mixed solution of 0.01 mol / L zinc acetate and 0.01 mol / L hexamethylenetetramine, and add the silica fiber membrane coated with zinc oxide seeds and 80 mL of the mixed solution to poly In a reaction kettle lined with tetrafluoroethylene, react at 60°C for 6 hours, take it out, wash it with deionized water for 3 times, and dry it at room temperature for 4 hours to obtain a silica fiber dynamic membrane;

[0027] d) Place ...

Embodiment 2

[0031] A method for preparing a selective oil-water separation dynamic membrane, comprising:

[0032]a) Add 0.1mol of zinc acetate to 100mL of absolute ethanol, stir vigorously until dissolved, and reflux the resulting zinc acetate ethanol solution at 80°C for 3 hours to obtain a milky white zinc sol;

[0033] b) Soak a 10 cm2 silica fiber membrane in 50 mL of zinc sol for 10 seconds, dry at 80°C for 10 minutes, repeat soaking 5 times, and anneal at 200°C for 15 minutes to obtain silica fibers coated with zinc oxide seeds membrane;

[0034] c) Prepare 80mL of a mixed solution of zinc acetate with a concentration of 0.01mol / L and ammonium chloride with a concentration of 0.01mol / L, and add the silica fiber membrane coated with zinc oxide seeds and 80mL of the mixed solution into polytetrafluoroethylene In a lined reactor, react at 60°C for 6 hours, take it out, wash it with deionized water for 3 times, and dry it at room temperature for 4 hours to obtain a silica fiber dynamic...

Embodiment 3

[0039] A method for preparing a selective oil-water separation dynamic membrane, comprising:

[0040] a) Add 0.001mol of zinc acetate to 100mL of absolute ethanol, stir vigorously until dissolved, and reflux the resulting zinc acetate ethanol solution at 70°C for 3 hours to obtain a milky white zinc sol;

[0041] b) Immerse a 10 cm2 copper mesh in 50 mL of zinc sol for 10 seconds, dry at 60°C for 10 minutes, repeat soaking 5 times, and anneal at 200°C for 45 minutes to obtain a copper mesh coated with zinc oxide seeds;

[0042] c) Prepare 80mL of a mixed solution of 0.1mol / L zinc acetate and 0.1mol / L ammonium fluoride, and add the copper mesh material coated with zinc oxide seeds and 80mL of the mixed solution into polytetrafluoroethylene In a lined reactor, react at 60°C for 6 hours, take it out, wash it with deionized water for 3 times, and dry it at room temperature for 4 hours to obtain a copper mesh dynamic film;

[0043] d) Place the copper mesh dynamic film in a tube f...

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Abstract

The invention belongs to the technical field of chemical separation materials, relates to oil-water separation membranes and in particular relates to a method for preparing a selective oil-water separation dynamic membrane and application of the method. The method disclosed by the invention comprises the following steps: adding zinc acetate into absolute ethyl alcohol, and heating and refluxing so as to prepare zinc sol; dipping a base membrane into the zinc sol, and performing high temperature annealing so as to obtain a porous basement membrane coated with zinc oxide seeds; carrying out a hydrothermal reaction between the basement membrane and a zinc acetate pH regulator solution, washing and drying so as to obtain a zinc oxide pre-coated porous separation membrane; and removing oxygen deficiency in a hydrogen atmosphere or obtaining the oxygen deficiency in an oxygen atmosphere by utilizing the surface related deficiency influence of the pre-coated zinc oxide, and respectively obtaining a super-hydrophobic surface and a super-hydrophilic surface, so that the problem that the oil-water separation membrane has poor wetting selectivity is solved. The wetted selective oil-water separation dynamic membrane prepared by the method disclosed by the invention can be applied to oil-water separation and can be repeatedly recycled. The method disclosed by the invention is simple in preparation process, does not cause secondary pollution or emission of toxic substances, and is energy-saving and applicable to industrialized production.

Description

technical field [0001] The invention belongs to the technical field of chemical separation materials, and relates to an oil-water separation membrane, in particular to a preparation method and application of a selective oil-water separation dynamic membrane. Background technique [0002] As a highly polluting substance, oily wastewater, papermaking wastewater, and printing and dyeing wastewater are collectively known as the three major industrial wastewaters. Its discharge volume is large and its sources are extensive, causing serious pollution to the ecological environment. The sources of oily wastewater mainly include: (1), oily wastewater produced by oil-intensive industries such as oil refining, textile, and food industries; (2), oily wastewater produced during oil extraction and transportation; (3), frequent leaks Oil incidents caused a large amount of crude oil to leak into the environment, forming oily sewage. At present, my country has listed the treatment and resou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/14B01D71/02B01D71/06C02F1/40C02F1/44B01D67/00
CPCB01D67/0039B01D69/14B01D71/022B01D71/027B01D71/06C02F1/40C02F1/44
Inventor 岳学杰张涛杨冬亚荣坚袁登森邱凤仙朱瑶
Owner JIANGSU UNIV
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