A method for preparing continuous cellulose/nanometal airgel fibers with catalytic performance after loading nanometer metals

Abstract

The invention discloses a method for preparing continuous cellulose / nano-metal aerogel fiber with catalytic performance from back-loaded nano-metal. The method comprises the following steps: preparing cellulose into a spinning solution; adding an acid solution, an ethanol solution or an acetone solution into a coagulating tank to be used as a coagulating bath; adding the spinning solution into the coagulating bath, and conducting wet spinning to obtain cellulose gel fiber; winding the obtained cellulose gel fiber, immersing the wound cellulose gel fiber into an ageing solution for ageing at the room temperature for 15 min to 1 h, washing with deionized water to be neutral, then immersing the washed cellulose gel fiber into a metal salt solution, taking out, removing a surface solvent, immersing the cellulose gel fiber into a reducing agent, washing with deionized water to be neutral, then conducting solvent replacement, and drying so as to obtain the continuous cellulose / nano-metal aerogel fiber. The prepared continuous cellulose / nano-metal aerogel fiber with catalytic performance has rich pores and high specific surface area, and meanwhile the fiber specific surface area and the content of nano metal in the fiber are adjustable.

Description

technical field

[0001] The invention belongs to the field of preparation of airgel fibers, and in particular relates to a method for preparing continuous cellulose / nano metal airgel fibers with catalytic performance by post-loading nanometer metals. Background technique

[0002] A catalyst is a class of substances that alter the rate of a chemical reaction without itself entering into the molecular makeup of the final product. In practical applications, catalytically active components such as gold, silver, platinum, palladium, etc. are often expensive and have low utilization rates. In order to improve the catalytic efficiency of catalysts and reduce the amount of catalytically active components, the catalytically active components are loaded on the carrier. The carrier can make the catalyst have a certain shape, size and mechanical strength, and can disperse the active components on the surface of the carrier to obtain a higher specific surface area and improve the catalyti...

Examples

Embodiment 1

[0029]Bacterial cellulose (Hainan Yide Food Co., Ltd., crushed compressed coconut) is dispersed in a low-temperature solvent system with a mass fraction of 7% NaOH / 8% urea / 10% thiourea, wherein the mass fraction of bacterial cellulose is 2% (all percentages include itself, the same below), mechanically vigorously stirred for 30min, carried out defoaming treatment 20min with centrifuge 10000r / min, in coagulation tank, add volume fraction and be 10% ethanol aqueous solution as coagulation bath, in this coagulation bath Add the spinning dope after defoaming treatment to the wet spinning, and the extrusion speed of the spinning dope is 0.6m / min. The cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 0.6 m / min. The wound fibers were immersed in pure ethanol solution and aged for 1 h to make them completely gelled. After aging, the fibers were washed with deionized water until neutral, and the obtained cellulose gel fibers were immersed in 0.01mol / ...

Embodiment 2

[0031] Disperse the treated cotton pulp cellulose in a low-temperature solvent system with a mass fraction of 8% NaOH / 8% urea / 6.5% thiourea, wherein the mass fraction of cotton pulp cellulose is 7%, stir mechanically for 30min, and use a centrifuge 10000r / min carries out defoaming treatment for 20min, and in the coagulation tank, add an ethanol aqueous solution with a volume fraction of 50% as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning, and the spinning stock solution The extrusion speed is 3m / min; after winding the cellulose gel fiber in the coagulation bath at a winding speed of 6m / min, it is immersed in the aging liquid ethanol and aged at room temperature for 1h to make it completely gel After aging, the fiber was washed with deionized water to neutrality and immersed in 0.01mol / L AgNO 3 In the solution for 20min, take it out, remove the surface solvent, immerse in 0.06mol / L hydrazin...

Embodiment 3

[0033] Disperse the bacterial cellulose in a low-temperature solvent system with a mass fraction of 9.5% NaOH / 4.5% thiourea, wherein the mass fraction of the bacterial cellulose is 7%, stir mechanically for 30 minutes, and use a centrifuge at 10000r / min to perform defoaming treatment for 20 minutes. In the coagulation tank, add acetone aqueous solution with a volume fraction of 10% as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning. The extrusion speed of the spinning stock solution is 2.4m / min ; After the cellulose gel fiber is wound with a winding speed of 6m / min in the coagulation bath, it is immersed in the aging liquid acetone and aged for 20min at normal temperature to make it completely gelled; after aging, the fiber After washing with deionized water to neutrality, immerse in 0.01mol / L CuSO 4 In the solution for 20min, take it out, remove the surface solvent, and immerse in 0.1mol / L a...

technical field

[0001] The invention belongs to the field of preparation of airgel fibers, and in particular relates to a method for preparing continuous cellulose / nano metal airgel fibers with catalytic performance by post-loading nanometer metals. Background technique

[0002] A catalyst is a class of substances that alter the rate of a chemical reaction without itself entering into the molecular makeup of the final product. In practical applications, catalytically active components such as gold, silver, platinum, palladium, etc. are often expensive and have low utilization rates. In order to improve the catalytic efficiency of catalysts and reduce the amount of catalytically active components, the catalytically active components are loaded on the carrier. The carrier can make the catalyst have a certain shape, size and mechanical strength, and can disperse the active components on the surface of the carrier to obtain a higher specific surface area and improve the catalyti...

Examples

Embodiment 1

[0029]Bacterial cellulose (Hainan Yide Food Co., Ltd., crushed compressed coconut) is dispersed in a low-temperature solvent system with a mass fraction of 7% NaOH / 8% urea / 10% thiourea, wherein the mass fraction of bacterial cellulose is 2% (all percentages include itself, the same below), mechanically vigorously stirred for 30min, carried out defoaming treatment 20min with centrifuge 10000r / min, in coagulation tank, add volume fraction and be 10% ethanol aqueous solution as coagulation bath, in this coagulation bath Add the spinning dope after defoaming treatment to the wet spinning, and the extrusion speed of the spinning dope is 0.6m / min. The cellulose gel fibers formed in the coagulation bath were wound at a winding speed of 0.6 m / min. The wound fibers were immersed in pure ethanol solution and aged for 1 h to make them completely gelled. After aging, the fibers were washed with deionized water until neutral, and the obtained cellulose gel fibers were immersed in 0.01mol / ...

Embodiment 2

[0031] Disperse the treated cotton pulp cellulose in a low-temperature solvent system with a mass fraction of 8% NaOH / 8% urea / 6.5% thiourea, wherein the mass fraction of cotton pulp cellulose is 7%, stir mechanically for 30min, and use a centrifuge 10000r / min carries out defoaming treatment for 20min, and in the coagulation tank, add an ethanol aqueous solution with a volume fraction of 50% as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning, and the spinning stock solution The extrusion speed is 3m / min; after winding the cellulose gel fiber in the coagulation bath at a winding speed of 6m / min, it is immersed in the aging liquid ethanol and aged at room temperature for 1h to make it completely gel After aging, the fiber was washed with deionized water to neutrality and immersed in 0.01mol / L AgNO 3 In the solution for 20min, take it out, remove the surface solvent, immerse in 0.06mol / L hydrazin...

Embodiment 3

[0033] Disperse the bacterial cellulose in a low-temperature solvent system with a mass fraction of 9.5% NaOH / 4.5% thiourea, wherein the mass fraction of the bacterial cellulose is 7%, stir mechanically for 30 minutes, and use a centrifuge at 10000r / min to perform defoaming treatment for 20 minutes. In the coagulation tank, add acetone aqueous solution with a volume fraction of 10% as a coagulation bath, add the spinning stock solution after the defoaming treatment in the coagulation bath, and carry out wet spinning. The extrusion speed of the spinning stock solution is 2.4m / min ; After the cellulose gel fiber is wound with a winding speed of 6m / min in the coagulation bath, it is immersed in the aging liquid acetone and aged for 20min at normal temperature to make it completely gelled; after aging, the fiber After washing with deionized water to neutrality, immerse in 0.01mol / L CuSO 4 In the solution for 20min, take it out, remove the surface solvent, and immerse in 0.1mol / L a...

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