Preparation method and application of silicon dioxide/cellulose composite porous material

A technology of silica and porous materials, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of high cost, single source of cellulose, etc., achieve simple operation, high CO2 adsorption capacity, raw materials Inexpensive and easy-to-get effects

Inactive Publication Date: 2020-04-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dissolving and mixing of cellulose and silicon dioxide in these disclosed methods is a two-step method: first, the cellulose is fully swollen in the solvent, and then mixed with the silicon source dissolved in the solvent, and the fiber used All of them are high-purity cellulose, such as cotton linter pulp, microcrystalline cellulose, nanocrystalline cellulose, bacterial cellulose, and cellulose derivatives. The sources of these celluloses are single and costly.

Method used

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  • Preparation method and application of silicon dioxide/cellulose composite porous material
  • Preparation method and application of silicon dioxide/cellulose composite porous material
  • Preparation method and application of silicon dioxide/cellulose composite porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Prepare fly ash-based silica wet gel, that is, mix fly ash and sodium carbonate evenly at a mass ratio of 1:1.2, place it at 800°C for 2 hours, take it out and cool it to room temperature, press The ratio of adding 8mL hydrochloric acid solution to 1g roasted product is to add 3mol / L hydrochloric acid solution to the roasted product while stirring, and after fully dissolving, filter, and place the filtrate at 90°C for sol-gel for 2 hours, and add 20 mL of hydrochloric acid solution with a concentration of 1 mol / L, ultrasonicated for 5 minutes, suction filtered, and washed repeatedly with deionized water until neutral, and the fly ash-based silica wet gel was obtained;

[0031] (2019).CO 2 The method in capture performance and characterization of cellulose aerogels synthesized from old corrugated containers. CarbohydrPolym, 115380. extracts cellulose from waste corrugated paper;

[0032](3) Put fly ash-based silica wet gel and old corrugated paper-based cellulose...

Embodiment 2

[0038] (1) Prepare coal gangue-based silica wet gel, that is, mix coal gangue and sodium carbonate evenly at a mass ratio of 1:1.2, place it at 800°C for 2 hours, take it out and cool it to room temperature, and then roast it at 1 g Proportion of adding 8mL hydrochloric acid solution to the product. Add 3mol / L hydrochloric acid solution to the roasted product while stirring. After fully dissolving, filter the filtrate and place the filtrate at 90°C for sol-gel for 2 hours. Add 20mL concentration of It is a 1mol / L hydrochloric acid solution, ultrasonicated for 5 minutes, suction filtered, and washed repeatedly with deionized water until neutral, and the gangue-based silica wet gel is obtained;

[0039] (2) Extract cellulose from waste corrugated paper, the method is the same as in Example 1;

[0040] (3) Put coal gangue-based silica wet gel and old corrugated paper-based cellulose into a beaker at the same time, wherein the mass ratio of silica wet gel dry basis to cellulose dr...

Embodiment 3

[0046] (1) Prepare fly ash-based silica wet gel, that is, mix fly ash and sodium carbonate evenly at a mass ratio of 1:1.2, place it at 800°C for 2 hours, take it out and cool it to room temperature, press The ratio of adding 8mL hydrochloric acid solution to 1g roasted product is to add 3mol / L hydrochloric acid solution to the roasted product while stirring, and after fully dissolving, filter, and place the filtrate at 90°C for sol-gel for 2 hours, and add 20 mL of hydrochloric acid solution with a concentration of 1 mol / L, ultrasonicated for 5 minutes, suction filtered, and washed repeatedly with deionized water until neutral, and the fly ash-based silica wet gel was obtained;

[0047] (2) extract cellulose from waste newsprint, the method is the same as embodiment 1;

[0048] (3) Put fly ash-based silica wet gel and cellulose into a beaker at the same time, wherein the mass ratio of silica wet gel dry base to cellulose dry base is 2:1; then pour it into the beaker that has ...

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Abstract

The invention discloses a preparation method of a silicon dioxide / cellulose composite porous material. The method comprises the following steps: simultaneously dissolving silicon dioxide and celluloseby a one-step technology by using an alkali / urine solution as a solvent, and forming silicon dioxide particles on the cellulose surface in situ to prepare the silicon dioxide / cellulose composite porous material. The method is simple to operate and short in process. In addition, the related raw materials are wide in source, are all solid wastes, and are cheap and easy to obtain; and the porous material prepared in the invention has a good CO2 trapping effect under an environmental condition, the maximum trapping capacity can reach 35%, the maximum CO2 / N2 selectivity can reach 32.69, and the material has a good CO2 trapping application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic / organic composite porous materials, in particular to the "one-step method" of simultaneously dissolving silicon dioxide and cellulose in alkali / urine solution to prepare silicon dioxide with freely adjustable silicon content and uniformly dispersed silicon particles / Cellulose Composite Porous Materials. Background technique [0002] Silica / cellulose composite porous material, the intervention of cellulose through physical or chemical bonding not only improves the intrinsic properties (such as rigidity and brittleness) of silica single-component aerogels, but also affects the mechanical properties (tensile Intensity, Young's modulus, etc.) have a great impact, while improving wettability and chemical accessibility, so it has received extensive attention and research from domestic and foreign scholars. [0003] There are currently two main techniques for the preparation of silica / cellulose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/103B01J20/24Y02C20/40
Inventor 陕绍云缪应菊支云飞苏红莹
Owner KUNMING UNIV OF SCI & TECH
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