Preparation method of mulberry fiber composite three-dimensional oil-water separation membrane

Abstract

The invention discloses a preparation method of a mulberry fiber composite three-dimensional oil-water separation membrane, and belongs to the technical field of membranes. The preparation method comprises the following preparation steps: (1) preparing mulberry fibers; (2) treatment and modification of mulberry fibers: using enzyme partial treatment and ionic liquid mixed liquid treatment; (3) preparing a single-layer membrane: adding a cross-linking reagent, a hydrophobic reagent and an initiator, and drying and molding to obtain a molded hydrophobic and oleophylic single-layer membrane; and (4) preparation of the three-dimensional multilayer membrane: preparing the single-layer film into the multi-layer three-dimensional composite membrane by adopting an ionic liquid composite cross-linking agent according to application requirements. The method has the beneficial effect that a new way is provided for resource utilization of biomass wastes. The method has the advantages of high efficiency, environmental friendliness and the like, the spatial dimension and the contact area of the membrane are improved, and the problem of poor mechanical properties of the membrane in the use process is solved.

Description

technical field

[0001] The invention belongs to the technical field of membranes, and relates to a preparation method of a mulberry fiber composite three-dimensional oil-water separation membrane. Background technique

[0002] After a year of growth and use, the mulberry tree grows in disorder in winter, some branches become invalid branches, and some diseases and insect pests also board on the tree body. The growing small mulberry tree also needs to be shaped. To solve these problems, manual pruning is required. As a renewable biomass resource, mulberry branches are the main by-products of sericulture production, and are generally used as fuel. Because they are not treated effectively, they are burned on the spot, which greatly reduces their potential value. The molecules in the mulberry cellulose crystalline region are neatly arranged and the molecular hydroxyl groups are either inside the molecule or combined with hydrogen ions outside the molecule to form hydrogen bonds...

Examples

Embodiment 1

[0033] Preparation of ionic liquid-sodium hydroxide solution: add 3 g of sodium hydroxide to 90 g of 1-ethyl-3-methylimidazole diethyl phosphate salt ([EMIM][DEP]), stir and mix.

[0034] Preparation of mulberry fiber: Take 1g of mulberry branch powder and add it to 20g of ionic liquid-sodium hydroxide solution, heat and stir at 100°C for 30min, add water to wash, add 30U / L cellulase and laccase, stir at 50°C, and carry out enzyme reaction 2h, obtain mulberry fiber;

[0035] Preparation of ionic liquid mixture: 90 g of 1-amido-3-methylimidazolium chloride ([AMIM][Cl]) and 10 g of dimethyl sulfoxide were stirred and mixed.

[0036] Preparation of single-layer film: Weigh 1g of mulberry material, add 0.025g of potassium persulfate, add 10g of ionic liquid mixed solution and 0.15g of deionized water into a flask, shake and mix, oil bath for 10min, the temperature is 80°C, Then add 0.63g of butyl methacrylate, 0.5g of divinylbenzene, 70°C oil bath for 3h, remove the beaker from t...

Embodiment 2

[0038] The difference from Example 1 is that 85 g of 1-amido-3-methylimidazolium chloride salt and 15 g of dimethyl sulfoxide were mixed evenly when preparing the ionic liquid mixture.

Embodiment 3

[0040] Preparation of double-layer film: preparation of ionic liquid composite crosslinking reagent: 90 g of ionic liquid and 0.15 (wt%) N,N-dimethylaminoethyl methacrylate 10 g.

[0041] Preparation of bacterial culture solution: Take 1.2 g of glucose, 0.15 g of yeast extract, and 0.15 g of peptone, add 300 mL of distilled water, adjust the pH of the solution to 6.5, and sterilize under high pressure at 121 ° C for 20 min. Inoculate 0.5 ml of Acetobacter xylinum seed solution with an inoculation loop, and culture at 30° C. for 16 hours to obtain bacterial culture solution.

[0042]Take the single-layer membrane obtained in Example 1 or 2, and paint 1 g of ionic liquid compound cross-linking reagent on the surface of the membrane. Ultraviolet light is used for treatment, and the treatment time is 60s. Add 15ml of bacterial culture solution, shake in a shaker, and incubate at 30°C for 2 days, Acetobacter xylinum can produce bacterial cellulose membrane structure on the membran...

technical field

[0001] The invention belongs to the technical field of membranes, and relates to a preparation method of a mulberry fiber composite three-dimensional oil-water separation membrane. Background technique

[0002] After a year of growth and use, the mulberry tree grows in disorder in winter, some branches become invalid branches, and some diseases and insect pests also board on the tree body. The growing small mulberry tree also needs to be shaped. To solve these problems, manual pruning is required. As a renewable biomass resource, mulberry branches are the main by-products of sericulture production, and are generally used as fuel. Because they are not treated effectively, they are burned on the spot, which greatly reduces their potential value. The molecules in the mulberry cellulose crystalline region are neatly arranged and the molecular hydroxyl groups are either inside the molecule or combined with hydrogen ions outside the molecule to form hydrogen bonds...

Examples

Embodiment 1

[0033] Preparation of ionic liquid-sodium hydroxide solution: add 3 g of sodium hydroxide to 90 g of 1-ethyl-3-methylimidazole diethyl phosphate salt ([EMIM][DEP]), stir and mix.

[0034] Preparation of mulberry fiber: Take 1g of mulberry branch powder and add it to 20g of ionic liquid-sodium hydroxide solution, heat and stir at 100°C for 30min, add water to wash, add 30U / L cellulase and laccase, stir at 50°C, and carry out enzyme reaction 2h, obtain mulberry fiber;

[0035] Preparation of ionic liquid mixture: 90 g of 1-amido-3-methylimidazolium chloride ([AMIM][Cl]) and 10 g of dimethyl sulfoxide were stirred and mixed.

[0036] Preparation of single-layer film: Weigh 1g of mulberry material, add 0.025g of potassium persulfate, add 10g of ionic liquid mixed solution and 0.15g of deionized water into a flask, shake and mix, oil bath for 10min, the temperature is 80°C, Then add 0.63g of butyl methacrylate, 0.5g of divinylbenzene, 70°C oil bath for 3h, remove the beaker from t...

Embodiment 2

[0038] The difference from Example 1 is that 85 g of 1-amido-3-methylimidazolium chloride salt and 15 g of dimethyl sulfoxide were mixed evenly when preparing the ionic liquid mixture.

Embodiment 3

[0040] Preparation of double-layer film: preparation of ionic liquid composite crosslinking reagent: 90 g of ionic liquid and 0.15 (wt%) N,N-dimethylaminoethyl methacrylate 10 g.

[0041] Preparation of bacterial culture solution: Take 1.2 g of glucose, 0.15 g of yeast extract, and 0.15 g of peptone, add 300 mL of distilled water, adjust the pH of the solution to 6.5, and sterilize under high pressure at 121 ° C for 20 min. Inoculate 0.5 ml of Acetobacter xylinum seed solution with an inoculation loop, and culture at 30° C. for 16 hours to obtain bacterial culture solution.

[0042]Take the single-layer membrane obtained in Example 1 or 2, and paint 1 g of ionic liquid compound cross-linking reagent on the surface of the membrane. Ultraviolet light is used for treatment, and the treatment time is 60s. Add 15ml of bacterial culture solution, shake in a shaker, and incubate at 30°C for 2 days, Acetobacter xylinum can produce bacterial cellulose membrane structure on the membran...

Images