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A method for preparing lignin-based porous nano-carbon fibers based on heat conduction

A nano-carbon fiber, lignin-based technology, applied in fiber processing, fiber chemical characteristics, chemical post-processing of rayon, etc., can solve the problems of difficult regulation of pore structure and low mesoporous content, and achieve controllable pore structure, mesoporous high content

Active Publication Date: 2020-10-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing lignin-based porous nano-carbon fibers based on heat conduction, which solves the problems that the mesopore content of nano-carbon fibers prepared from lignin is low and the pore structure is difficult to control

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1: Dissolve 98g of purified lignin (with a weight-average molecular weight of 4,000) in an alkaline solution of pH=12 in a single-necked flask, and add 1g of sodium alginate (with a weight-average molecular weight of 70,000) and 1g of nano-copper , ultrasonically disperse for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz), and then use a rotary evaporator at 80°C to obtain a lignin / sodium alginate / copper hybrid material; the resulting hybrid material is added to a melt centrifugal spinning machine Spinning was carried out at a spinning temperature of 240° C. and a centrifugal speed of 6000 rpm to obtain lignin / sodium alginate / nano-copper hybrid nanofibers. The obtained hybrid nanofibers were pre-oxidized, carbonized and activated in a tube furnace, and the temperature was first raised to 280°C at a heating rate of 0.01°C / min, and kept at a constant temperature for 1h. Then the temperature was raised to 1000°C at a rate of 1°C / min for carbonization, an...

Embodiment 2

[0016] Example 2: 96g of purified lignin (with a weight average molecular weight of 4,000) was dissolved in an alkaline solution of pH=12 in a single-necked flask, and 2g of sodium alginate (with a weight average molecular weight of 70,000) and 2g of nano-copper were added successively , ultrasonically disperse for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz), and then use a rotary evaporator at 80°C to obtain a lignin / sodium alginate / copper hybrid material; the resulting hybrid material is added to a melt centrifugal spinning machine The spinning temperature is 250° C., and the centrifugal speed is 8000 rpm to obtain lignin / sodium alginate / nano-copper hybrid nanofibers. The obtained hybrid nanofibers were pre-oxidized, carbonized and activated in a tube furnace. Firstly, the temperature was raised to 280° C. at a rate of 0.03° C. / min, and the temperature was kept constant for 3 hours. Then, the temperature was raised to 1200°C at a heating rate of 3°C / min for car...

Embodiment 3

[0017] Example 3: 96g of purified lignin (with a weight average molecular weight of 4,000) was dissolved in an alkaline solution of pH=12 in a single-necked flask, and 1g of sodium alginate (with a weight average molecular weight of 70,000) and 3g of nanometer copper were added successively , ultrasonically disperse for 30min (ultrasonic power 120W, ultrasonic frequency 40KHz), and then use a rotary evaporator at 80°C to obtain a lignin / sodium alginate / copper hybrid material; the resulting hybrid material is added to a melt centrifugal spinning machine Spinning was carried out at a spinning temperature of 240° C. and a centrifugal speed of 10,000 rpm to obtain lignin / sodium alginate / nano-copper hybrid nanofibers. The obtained hybrid nanofibers were pre-oxidized, carbonized and activated in a tube furnace. Firstly, the temperature was raised to 280° C. at a rate of 0.05° C. / min, and the temperature was kept constant for 3 hours. Then, the temperature was raised to 1200°C at a h...

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Abstract

The invention discloses a heat-conduction-based method for preparing lignin-based porous nano carbon fibers. The heat-conduction-based method includes dissolving purified lignin in an alkaline solution, adding sodium alginate and nano copper, and performing decompressed rotary evaporation after ultrasonic stirring to obtain hybrid materials; adding the hybrid materials into a centrifugal spinningmachine for fused centrifugal spinning at the temperature of 200-250 DEG C to obtain hybrid fibers; putting the hybrid fibers into a high-temperature furnace, increasing the temperature to 280-300 DEGC at the temperature rise speed of 0.01-3 DEG C / min, and keeping the constant temperature for 1-6 hours; increasing the temperature to 1000-2000 DEG C, performing carbonization for 0.5-12 hours, andperforming acid pickling to obtain the nano carbon fibers. The heat-conduction-based method has the advantages of high mesoporous content and controllable porous structure of the nano carbon fibers made from the lignin.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon fibers, and relates to a method for preparing lignin-based porous nano-carbon fibers based on heat conduction. Background technique [0002] Lignin derived from papermaking black liquor has attracted much attention due to its advantages of high carbon content, renewable resources, and low price. However, the complexity of its components and the diversity of its performance greatly limit its further application, and most of them are burned for power generation, and the effective utilization rate is extremely low. Preparation of activated carbon fibers from lignin by spinning, pre-oxidation, carbonization and activation has become an effective way to increase its added value. In order to further expand the application of lignin-based activated carbon materials in the field of smart clothing, the key is to construct low-cost porous carbon fibers with large specific surface area,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/17D01F11/12D01D5/18
CPCD01D5/18D01F9/17D01F11/121
Inventor 王世超唐建国刘继宪王瑶焦吉庆黄林军沈文飞
Owner QINGDAO UNIV
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