Preparation method and application of zif-8 modified cellulose membrane with switchable surface wettability

A ZIF-8, a technology for modifying cellulose, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve problems such as toxic solvents and ions, limit the application of oily wastewater, and monotonous wettability of membranes, and achieve the preparation method. Simple and easy to implement, good recyclability, good throughput effect

Active Publication Date: 2021-10-12
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Superwetting materials have attracted much attention in the field of emulsion separation, usually these materials show higher separation efficiency, but the monotonic wettability of membranes severely limits their application in treating different types of oily wastewater
Researchers have achieved on-demand controllable oil / water separation with switchable wetting materials, such as the cellulose-PVA membrane developed by XiXu et al., which has good durability but can only separate oil-in-water emulsions, however, The use of these materials usually requires some external stimuli, such as temperature, electricity, light, etc., which are inconvenient to use, and there are also high energy consumption (such as heat energy, electric energy and light energy) and secondary pollution (acidic and alkaline solutions, toxic solvents and ions, etc.) still need to be solved; another example is the reversible wettable biocellulose material developed by MeixiaoCheng et al., which can change hydrophilicity to hydrophobicity, lipophilicity to oleophobicity, but it needs to be PH controlled, and the separation efficiency is not good. high

Method used

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  • Preparation method and application of zif-8 modified cellulose membrane with switchable surface wettability
  • Preparation method and application of zif-8 modified cellulose membrane with switchable surface wettability
  • Preparation method and application of zif-8 modified cellulose membrane with switchable surface wettability

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of RC@PDA: Immerse the RC membrane in 100 mL of tris-HCl solution with a concentration of 9 mM, add 190 mg of dopamine, shake at 24 °C for 5 h, ultrasonically clean, and dry naturally to obtain RC@PDA membrane;

[0032] (2) 0.2945g of Zn(NO 3 ) 2 ·6H 2 O is mixed with 20mL of methanol solution to obtain mixed solution A; then 0.1642g of dimethylimidazole and 20mL of methanol solution are mixed to obtain mixed solution B; the RC@PDA membrane prepared in step (1) is immersed in mixed solution A After soaking for 25 minutes, add mixed solution B, the volume ratio of mixed solution A to mixed solution B is 1:1; stand at 24°C for 50 minutes, remove the product and wash it with methanol, and dry it in vacuum at 80°C for 11 hours to obtain ZIF-8 The modified cellulose membrane is RC@PDA / ZIF-8 membrane.

Embodiment 2

[0034] (1) Preparation of RC@PDA: Immerse the RC membrane in 100 mL of tris-HCl solution with a concentration of 10 mM, add 200 mg of dopamine, shake at 25 °C for 6 h, ultrasonically clean, and dry naturally to obtain RC@PDA membrane;

[0035] (2) 0.5870g of Zn(NO 3 ) 2 ·6H 2 O was mixed with 20mL of methanol solution to obtain mixed solution A; then 0.3284g of dimethylimidazole was mixed with 20mL of methanol solution to obtain mixed solution B; the RC@PDA membrane prepared in step (1) was immersed in mixed solution A After soaking for 30 minutes, add mixed solution B, the volume ratio of mixed solution A to mixed solution B is 1:1; stand at 25°C for 60 minutes, remove the product, wash it with methanol, and dry it under vacuum at 80°C for 12 hours to obtain ZIF-8 modification The cellulose membrane is RC@PDA / ZIF-8 membrane.

Embodiment 3

[0037] (1) Preparation of RC@PDA: Immerse the RC membrane in 100 mL of tris-HCl solution with a concentration of 11 mM, then add 210 mg of dopamine, shake it at 26°C for 7 hours, clean it ultrasonically, and dry it naturally to obtain RC@PDA membrane;

[0038] (2) 1.1780g of Zn(NO 3 ) 2·6H 2 O was mixed with 20mL of methanol solution to obtain mixed solution A; then 0.6568g of dimethylimidazole was mixed with 20mL of methanol solution to obtain mixed solution B; the RC@PDA membrane prepared in step (1) was immersed in mixed solution A After soaking for 35 minutes, add mixed solution B, the volume ratio of mixed solution A to mixed solution B is 1:1; stand at 26°C for 70 minutes, remove the product and wash it with methanol, and dry it under vacuum at 80°C for 13 hours to obtain ZIF-8 modification The cellulose film is RC@PDA / ZIF-8 film.

[0039] figure 1 SEM images of RC(a), RC@PDA(b) and RC@PDA / ZIF-8(c) films. The pristine RC membrane shows a laminated porous structure ...

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Abstract

The invention belongs to the technical field of preparation of environmental functional materials, and specifically relates to a preparation method and application of a switchable surface wettability ZIF-8 modified cellulose film; the steps are: immerse the RC film in a tris-HCl solution, and then add dopamine after soaking , ultrasonically cleaned after shaking, and dried naturally to obtain RC@PDA film; the Zn(NO 3 ) 2 ·6H 2 O was mixed with methanol solution to obtain mixed solution A; then dimethylimidazole and methanol solution were mixed to obtain mixed solution B; RC@PDA membrane was immersed in mixed solution A, after soaking, then added mixed solution B, after standing , rinsed and dried to obtain RC@PDA / ZIF‑8 film. The method of the invention is simple, economical and practical, and the prepared membrane material can be switched between underwater superoleophobicity and underwater hydrophobicity without external stimulation, has an oil-water emulsion separation efficiency as high as 99%, and has good recyclability.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a preparation method and application of a ZIF-8 modified cellulose film with switchable surface wettability. Background technique [0002] As society progresses, water pollution is becoming a growing problem. A large amount of oily wastewater is produced in industrial production process and daily life, and oily wastewater is one of the most common environmental problems. Oily wastewater is not only harmful to the environment, but also affects human health. Therefore, it is of great significance to develop materials that can effectively solve this problem. To solve the problem of oil pollution, scholars at home and abroad have done a lot of work, such as gravity separation, centrifugal separation, air flotation, electrocoagulation, precipitation, coagulation and membrane separation for oil-water separation. Among them, the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10B01D67/00B01D17/022
CPCB01D17/0202B01D67/0013B01D71/10
Inventor 杨瑾谢阿田崔久云陈阳阳戴江栋李春香
Owner JIANGSU UNIV
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