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Catecholamine-modified cellulose material as well as preparation method and application thereof in filter membrane

A catecholamine and cellulose technology, applied in the field of membrane separation, can solve the problems of low water flux and anti-pollution performance, and achieve the effects of increasing the difficulty of adsorption, being easy to degrade, and not easy to be hydrolyzed and lost.

Pending Publication Date: 2021-06-29
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above problems of low water flux and anti-pollution performance in the prior art, the present invention provides a catecholamine-modified cellulose material and a preparation method, as well as the application of the modified cellulose material in filter membranes

Method used

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  • Catecholamine-modified cellulose material as well as preparation method and application thereof in filter membrane
  • Catecholamine-modified cellulose material as well as preparation method and application thereof in filter membrane
  • Catecholamine-modified cellulose material as well as preparation method and application thereof in filter membrane

Examples

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preparation example Construction

[0060] Another embodiment of the present invention provides a method for preparing a catecholamine-modified cellulose material as described above, comprising the following steps:

[0061] S1, using sodium periodate to oxidize cellulose molecules to prepare dialdehyde-based cellulose;

[0062] S2. Add the dialdehyde-based cellulose and the catecholamine modifier into an organic solvent and mix evenly. The terminal of the catecholamine modifier contains an amino group, and the catecholamine modifier is connected to the branching onto the dialdehyde-based cellulose to obtain a polymer, and then adding a reducing agent to react, and after the reaction, separate and obtain a catecholamine-modified cellulose material. The reaction mechanism is as follows: firstly, the selective oxidant-sodium periodate selectively oxidizes the hydroxyl groups at the 2 and 3 positions of cellulose to generate dialdehyde-based cellulose, which leads to the destruction of the main chain structure of ce...

Embodiment 1

[0082] Embodiment 1 cellulose acetate grafted dopamine hydrochloride

[0083] A catecholamine-modified cellulose material, prepared by grafting catecholamine-based modifiers on cellulose acetate, the catecholamine-based modifier is dopamine hydrochloride, and the chemical structure of the catecholamine-modified cellulose-based materials is generally The formula is shown in formula (II):

[0084]

[0085] In formula (II), R is H or COCH 3 ; m is 70-90%, n is 10-30%, and m+n=100%.

[0086] The preparation method of the catecholamine modified cellulose material comprises the following steps:

[0087] S1. Dissolve 15 g of cellulose acetate in 300 mL of distilled water to obtain a cellulose acetate solution. Under the protection of an inert gas and avoid light, add 15 g of sodium periodate to the cellulose acetate solution, and heat to a temperature of 45° C. for 6 hours. Then add 75mL of ethylene glycol and react for 0.5h to obtain dialdehyde-based cellulose. The dialdehyde-...

Embodiment 2

[0091] Embodiment 2 cellulose acetate graft 5-hydroxyl dopamine

[0092] A catecholamine-modified cellulose-based material, prepared by grafting catecholamine-based modifiers on cellulose acetate, the catecholamine-based modifiers being 5-hydroxydopamine, the chemical composition of the catecholamine-based modified cellulose-based materials The general structural formula is as shown in formula (III):

[0093]

[0094] In formula (III), R is H or COCH 3 ; m is 70-90%, n is 10-30%, and m+n=100%.

[0095] The preparation method of the catecholamine-modified cellulose material is basically the same as that of Example 1, except that in step S1, 10 g of sodium periodate is added to the cellulose acetate solution, and heated to 45° C. for 4 hours. In step S2, 3 g of dialdehyde cellulose and 1 g of 5-hydroxydopamine were added to 30 mL of N,N-dimethylacetamide and mixed evenly.

[0096] In this example, it is calculated based on the molar ratio of the aldehyde group of dialdehyd...

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Abstract

The invention provides a catecholamine-modified cellulose material as well as a preparation method and application thereof in a filter membrane, belonging to the technical field of membrane separation. The catecholamine-modified cellulose material is prepared by grafting cellulose molecules with a catecholamine modifier through a Schiff base reaction, the cellulose molecules are one or more selected from a group consisting of cellulose, cellulose acetate, methyl cellulose and ethyl cellulose, and the catecholamine modifier is one or more selected from dopamine or noradrenaline. As the catecholamine modifier is strong in hydrophilicity, the water molecule binding capacity of the filter membrane can be greatly improved, protein adsorption difficulty is increased, and contamination on the surface of the filter membrane is reduced. Meanwhile, the passing speed of a solution can be increased due to the excellent hydrophilicity, and a water flux is increased. Moreover, the catecholamine modifier is a short-chain amphoteric molecule, and is grafted on a damaged main chain structure of cellulose through a Schiff base reaction, so the pore structure of the membrane can be improved, and the water flux is further improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a catecholamine-modified cellulose material and a preparation method, as well as the application of the catecholamine-modified cellulose material in filter membranes. Background technique [0002] With the rapid development of the national economy, the shortage of water resources and water pollution are becoming more and more serious. Membrane separation technology is based on the molecular weight of the material to be separated, with pressure difference as the driving force, using the sieving mechanism to separate and purify substances with different molecular weights, and has a good removal effect on macromolecular solutes such as suspended solids, colloids, microorganisms and proteins in water , has the advantages of green energy saving, easy control, and simple process. In recent years, it has been widely used in water treatment, food, electronics, chemical indust...

Claims

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Application Information

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IPC IPC(8): C08B15/06C08B15/02B01D71/12B01D67/00
CPCB01D67/0002B01D71/12C08B15/02C08B15/06
Inventor 刘旸孙楠郭翰祥王兆峰马曦
Owner NORTHEAST FORESTRY UNIVERSITY
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