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Method for preparing lignin-based hierarchical pore activated carbon fibers

An activated carbon fiber, lignin-based technology, applied in the chemical characteristics of fibers, rayon manufacturing, textiles and papermaking, etc., can solve the problems of difficult regulation of pore structure, few pores, and large size, and achieve controllable pore structure and more pores. , the effect of large specific surface area

Active Publication Date: 2018-01-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of lignin-based hierarchically porous activated carbon fibers, which solves the problem that the carbon fibers prepared by the existing methods have fewer holes, larger sizes, difficult control of the pore structure, and cannot be applied to fields such as supercapacitors. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 1g sodium silicate is joined in the one-necked flask that fills 200ml deionized water, after fully dissolving, add 98g purified lignin (weight-average molecular weight is 4 thousand) and 1g sodium alginate (weight-average molecular weight is 7 thousand) alternately Ten thousand). Raise the temperature to 80°C and stir evenly, then add 2mol / L hydrochloric acid to adjust the pH value to 2. The resulting mixed solution was evaporated using a rotary evaporator at 80° C. to obtain a lignin / sodium alginate / silica hybrid material. Dry the obtained hybrid material and put it into a melt spinning machine for melt spinning. The spinning temperature is 190-240°C, the size of the spinneret is 0.18mm×12f, and the spinning speed is 100m / min to obtain lignin / Sodium alginate / silica hybrid fibers. The obtained hybrid fibers were pre-oxidized, carbonized and activated in a tube furnace, and the temperature was first raised to 280°C at a rate of 0.01°C / min, and the temper...

Embodiment 2

[0018] Embodiment 2: 2g sodium silicate is joined in the one-necked flask that fills 200ml deionized water, after fully dissolving, add 96g purified lignin (weight-average molecular weight is 4 thousand) and 2g sodium alginate (weight-average molecular weight is 7 thousand) alternately Ten thousand). Raise the temperature to 80°C and stir evenly, then add 2mol / L hydrochloric acid to adjust the pH value to 2. The resulting mixed solution was evaporated using a rotary evaporator at 80° C. to obtain a lignin / sodium alginate / silica hybrid material. Dry the obtained hybrid material and put it into a melt centrifugal spinning machine for melt spinning. The spinning temperature is 190-230°C, the size of the spinneret is 0.18mm×12f, and the spinning speed is 600m / min to obtain lignin / Sodium Alginate / Silica Hybrid Fiber. The obtained hybrid fibers were pre-oxidized and carbonized in a tube furnace, and the temperature was raised to 280°C at a rate of 0.05°C / min, and the temperatu...

Embodiment 3

[0019] Embodiment 3: 3g sodium silicate is joined in the one-necked flask that fills 200ml deionized water, after fully dissolving, add 96g purified lignin (weight-average molecular weight is 4 thousand) and 1g sodium alginate (weight-average molecular weight is 7 thousand) alternately Ten thousand). Raise the temperature to 80°C and stir evenly, then add 2mol / L hydrochloric acid to adjust the pH value to 2. The resulting mixed solution was evaporated using a rotary evaporator at 80° C. to obtain a lignin / sodium alginate / silica hybrid material. Dry the obtained hybrid material and put it into a melt centrifugal spinning machine for melt spinning. The spinning temperature is 200-240°C, the size of the spinneret is 0.18mm×12f, and the spinning speed is 800m / min to obtain lignin / Sodium Alginate / Silica Hybrid Fiber. The obtained hybrid fibers were pre-oxidized and carbonized in a tube furnace, and the temperature was first raised to 290°C at a rate of 0.05°C / min, and kept at...

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Abstract

The invention discloses a method for preparing lignin-based hierarchical pore activated carbon fibers. The method comprises the following steps: alternately adding purified lignin and sodium alginateinto a sodium silicate aqueous solution at 60-80 DEG C, uniformly stirring, and adjusting the pH value to 1-2; performing rotary evaporation at reduced pressure to obtain a hybridized material; addingthe hybridized material into a melt spinning machine, and spinning at a temperature of 200-250 DEG C at a speed of 100-6000m / min to obtain hybridized fibers; heating the hybridized fibers in a high-temperature furnace to 280-300 DEG C at a speed of 0.01-3 DEG C, and insulating at a constant temperature for 1-6 hours; and heating to 1000-2000 DEG C at a speed of 1-5 DEG C / min, carbonizing for 0.5-12 hours, and activating and pickling to obtain porous activated carbon fibers. The method has the beneficial effects that the prepared carbon fibers have more pores, large specific surface and controllable pore structure.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon fibers, and relates to a preparation method of lignin-based hierarchical porous activated carbon fibers. Background technique [0002] Activated carbon materials have attracted much attention due to their advantages such as low price, large specific surface area, and excellent electrical conductivity. In order to further expand the application of activated carbon materials in the field of smart clothing, the key is to construct low-cost hierarchical porous activated carbon fibers with large specific surface area, controllable pore structure, and good mechanical properties. Among all the precursors of activated carbon fibers, lignin derived from papermaking black liquor has attracted much attention due to its advantages of high carbon content, renewable resources, and low price. Preparation of activated carbon fibers from lignin by spinning, pre-oxidation, carbonization and ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/17D01F1/10
Inventor 王世超唐建国王瑶刘继宪王彦欣王薇毛遂
Owner QINGDAO UNIV
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