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Natural cellulose substrate composite material modified by MOFs nanoparticles and preparation method thereof

A natural cellulose and nanoparticle technology, applied in the field of natural cellulose-based composite materials and its preparation, can solve the problems of low porosity, poor mechanical properties, etc., and achieve high porous structure and specific surface area, low density, and environmentally friendly Effect

Pending Publication Date: 2022-02-25
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor mechanical properties and low porosity, there are still challenges in practical applications.

Method used

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  • Natural cellulose substrate composite material modified by MOFs nanoparticles and preparation method thereof
  • Natural cellulose substrate composite material modified by MOFs nanoparticles and preparation method thereof
  • Natural cellulose substrate composite material modified by MOFs nanoparticles and preparation method thereof

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preparation example Construction

[0035] The present invention provides a kind of preparation method of the natural cellulose substrate composite material of MOFs nano particle modification, comprises the following steps:

[0036] The biomass material is chemically pretreated in an alkaline solution to obtain a flexible cellulose hierarchical porous material;

[0037] Under vacuum assistance, the flexible cellulose multi-level porous material is ion-exchanged in a metal salt solution, then an organic ligand solution is added for in-situ growth, and the above ion-exchange and in-situ growth processes are repeated for layer-by-layer assembly. The natural cellulose substrate composite material modified by the MOFs nanoparticles is obtained.

[0038] In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

[0039] In the invention, the biomass material is chemically pretreated in an alkaline solution to obtain a fl...

Embodiment 1

[0060] Place sugarcane in 1.0mol / L sodium hydroxide solution, chemically pretreat at 90°C for 12 hours, wash, and freeze-dry to obtain a flexible cellulose hierarchical porous material;

[0061] Under vacuum assistance (vacuum degree: 0.08MPa), 0.25g of the flexible cellulose multi-level porous material was immersed in 40mL of cobalt nitrate solution with a concentration of 0.04mol / L. After ion exchange at room temperature for 2h, 40mL of 0.16 The 2-methylimidazole coordination solution (solvent is anhydrous methanol) of mol / L, reacts 24h, obtains the natural cellulose substrate composite material (the natural cellulose substrate composite material modified by the MOFs nanoparticle modification of described MOFs nanoparticle) It is a three-dimensional network channel structure with an apparent density of 0.075g / cm 3 , the pore volume is 0.059cm 3 / g, MOFs nanoparticles are ZIF-67, particle diameter is 700nm, and the load capacity of described ZIF-67 is 3.5wt%).

Embodiment 2

[0063] Place sugarcane in 1.0mol / L sodium hydroxide solution, chemically pretreat at 90°C for 12 hours, wash, and freeze-dry to obtain a flexible cellulose hierarchical porous material;

[0064] Under vacuum assistance (vacuum degree: 0.08MPa), 0.25g of the flexible cellulose multi-level porous material was immersed in 40mL of cobalt nitrate solution with a concentration of 0.04mol / L. After ion exchange at room temperature for 2h, 40mL of 0.16 mol / L 2-methylimidazole solution (solvent is anhydrous methanol), reacted for 24h, repeated the above-mentioned ion exchange and in-situ growth process to carry out layer-by-layer assembly twice, and obtained the natural cellulose modified by the MOFs nanoparticles Substrate composite material (the natural cellulose substrate composite material modified by the MOFs nanoparticles is a three-dimensional network pore structure, and the apparent density is 0.081g / cm 3 , the pore volume is 0.129cm 3 / g, the MOFs nanoparticles are ZIF-67, and...

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Abstract

The invention relates to the technical field of cellulose-based functional materials, in particular to a natural cellulose substrate composite material modified by MOFs nanoparticles and a preparation method of the natural cellulose substrate composite material. The preparation method of the natural cellulose substrate composite material, which comprises the following steps: carrying out chemical pretreatment on a biomass material in an alkaline solution to obtain a flexible cellulose multistage porous material; under the assistance of vacuum, performing ion exchange on the flexible cellulose multistage porous material in a metal salt solution, adding an organic ligand solution for in-situ growth, and repeating the processes of ion exchange and in-situ growth for layer-by-layer assembly to obtain the natural cellulose substrate composite material modified by the MOFs nanoparticles. The preparation method can improve the flexibility and porosity of the natural cellulose.

Description

technical field [0001] The invention relates to the technical field of cellulose-based functional materials, in particular to a natural cellulose-based composite material modified by MOFs nanoparticles and a preparation method thereof. Background technique [0002] Metal-organic frameworks (MOFs) are a new type of crystalline porous materials with adjustable mechanism and function formed by metal ions or agglomeration and organic ligands through coordination self-assembly. They have been widely used in catalysis, bionics, fluorescence, chemical transmission Sensitivity, gas adsorption and separation and other fields. However, the crystalline nature of MOFs determines that they are all powdery, the internal space is inaccessible and hinders rapid mass transfer, and the processability of most MOFs microporous powders is a great challenge, which severely limits their practical applications. . In order to facilitate the industrial application of MOFs, a feasible strategy is pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08L1/02C08L97/02C08L87/00C08G83/00
CPCC08J9/405C08G83/008C08J2301/02C08J2397/02C08J2487/00
Inventor 王晓龙刘德胜蒋盼徐昕周峰刘维民
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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