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Super-hydrophilic super-oleophobic starch oil-water separation membrane, and preparation method and application thereof

An oil-water separation membrane, superoleophobic technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of easy oil pollution, increase energy consumption, secondary environmental pollution, etc., and achieve stable underwater Super oleophobicity, simple preparation method, green effect of raw materials

Active Publication Date: 2017-10-24
宁波海强装备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the different wettability of the surface of the material to oil and water, the material can be divided into two types: "oil-removing type" and "water-removing type", among which the "oil-removing type" material has the advantages of strong oil-water selectivity and good separation effect It is widely used, but due to its lipophilic nature, this material is easily polluted by oil during use. Disposal or incineration after use often causes secondary pollution to the environment, and at the same time increases energy consumption. Consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Prepare starch and distilled water into a starch solution with a ratio of 0.1 g / mL, stir until the starch is completely dissolved, add a certain amount of 4-dimethylaminopyridine and succinic anhydride, leave it for 24 hours, add aqueous sodium hydroxide solution, and The solution is adjusted to neutrality (pH value = 7.0), and ethanol is added to precipitate the product, then dehydrated and freeze-dried to obtain a superhydrophilic-superoleophobic starch oil-water separation membrane.

Embodiment 2

[0031] Embodiment 2: the preparation method of the starch oil-water separation membrane adopted in the present embodiment is basically the same as the preparation method of the starch oil-water separation membrane in Example 1, the difference is that the additive is acetic anhydride, add a certain amount of acetic anhydride and stir at room temperature After a certain period of time, add sodium hydroxide aqueous solution to neutralize the reaction mixture to neutrality (pH value = 7.0), add ethanol to precipitate the product, dehydrate and freeze-dry to obtain superhydrophilic-superoleophobic starch oil-water separation membrane.

Embodiment 3

[0032] Example 3: Mix starch and distilled water at a ratio of 0.1g / mL to make a starch solution, stir until the starch is completely dissolved and heat to 95°, then add a certain quality of PVA granules, continue heating, the stirring rate remains unchanged, until the PVA is completely dissolved Then add gelatin until the gelatin is completely dissolved (the mass ratio of starch:PVA:gelatin is 1:5:5), no granular objects exist in the solution, stop stirring, and lower the temperature to 40°C, keep warm for 10min, and remove bubble treatment. Then the mixed solution is poured on the template, cast into a film, freeze-dried, and the prepared hydrogel is the superhydrophilic-superoleophobic starch oil-water separation membrane.

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Abstract

The invention discloses a super-hydrophilic super-oleophobic starch oil-water separation membrane, and a preparation method and application thereof. The oil-water separation membrane is mainly formed by starch, a catalyst and an auxiliary agent through mixed reaction; a plurality of nanometer holes are distributed in the surface of the oil-water separation membrane, and communicate with a plurality of nanometer holes formed in the oil-water separation membrane. The preparation method comprises the steps that the starch, the catalyst and the auxiliary agent (the mass ratio is 1:(1 to 20):(2 to 20)) are mixed with water to form a mixed solution; then, the mixed solution is prepared into a membrane; the oil-water separation membrane is obtained. The starch oil-water separation membrane shows unique underwater super-oleophobic characteristic and efficient oil-water separation rate on different oil and organic solvents; the characteristics of stable super-oleophobicity, degradable performance, antibiosis, antifouling and self cleaning are realized; the preparation process is simple; the realization is easy; the raw material sources are rich; the cost is low; good application prospects are realized.

Description

technical field [0001] The invention particularly relates to a superhydrophilic and superoleophobic starch oil-water separation membrane, its preparation method and application, and belongs to the technical field of functional materials. Background technique [0002] In recent years, frequent oil spill accidents have caused serious environmental pollution and seriously affected people's production and life, making oil-water separation one of the research priorities of scientists. [0003] Due to the complex composition of oily sewage, it is difficult to achieve oil-water separation. There are many treatment methods for oily sewage, and different separation methods need to be adopted according to the type of oil in sewage and the size of oil droplets. The current separation methods mainly include physical methods, biological methods, chemical methods, electrochemical methods, etc., and physical separation methods include gravity separation, centrifugal separation, and filtrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022
CPCB01D17/02
Inventor 曾志翔韩志月王刚王立平
Owner 宁波海强装备科技有限公司
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