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Method for efficiently preparing cotton based mesoporous activated carbon fiber

An activated carbon fiber and cotton-based technology, which is applied to the chemical characteristics of fibers, textiles and papermaking, can solve the problems of low activation temperature, long preparation cycle, and short activation time, and achieve low bulk density, excellent adsorption performance, and lower activation temperature. Effect

Inactive Publication Date: 2016-04-13
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the existing activated carbon fiber preparation technology, such as complex process, high energy consumption, and long preparation cycle, and provides a fast, simple, and efficient method for preparing mesoporous activated carbon fibers. The method first uses hydrothermal carbonization to prepare carbonized materials , the carbonization temperature is as low as 200°C, and the yield is extremely high, which minimizes the consumption of raw materials for cotton, a raw material with low bulk density, low strength and easy to burn, and the final yield of the product is as high as 50%; Secondly, microwave-ultrasonic combined impregnation of carbonized materials is used. Compared with conventional static impregnation, stirring impregnation, and ultrasonic impregnation, the impregnation time is shorter, and even the activator impregnation solution can completely penetrate into the fiber within 30 minutes; and then use microwave heating at 250 Activated carbon fibers at -350°C for 5-15 minutes, the activation temperature is low, the activation time is short, and the mesopore ratio of the fiber can be adjusted by changing the microwave power and the concentration of the impregnating solution. The structure is developed, while obtaining activated carbon fibers with rich mesopore structure, it also opens up a new application path for the utilization of cotton

Method used

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  • Method for efficiently preparing cotton based mesoporous activated carbon fiber
  • Method for efficiently preparing cotton based mesoporous activated carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After cleaning the cotton, it is placed in a hydrothermal kettle, heated to 180°C at a heating rate of 10°C / min and kept for 1 hour, and then cooled to room temperature for later use. 100g of the obtained carbonized material is placed in a microwave ultrasonic combined system (microwave ultrasonic Combination instrument), under the conditions of microwave power of 100w and ultrasonic power of 200w, immerse in 500mL phosphoric acid solution with a concentration of 30% (Wt%) for 30 minutes, then filter, and place the filter material in microwave heating equipment (microwave high temperature tube furnace) , 400w power activation for 15 minutes, the obtained material is cooled to room temperature in the furnace in a nitrogen atmosphere, and then repeatedly washed with distilled water until the pH of the washing liquid reaches 6.5-7, and then dried in an oven at 100°C to obtain 22g of activated carbon fiber product.

[0030] The iodine adsorption value of activated carbon fiber ...

Embodiment 2

[0033] The recovered waste cotton is cleaned and placed in a hydrothermal kettle, heated to 200°C at a heating rate of 15°C / min for 1.5 hours, and the carbonized material obtained is placed in a microwave-ultrasonic combined system. The microwave power is 200w, ultrasonic Under the condition of 300w power, it is immersed in a mixed solution of phosphoric acid with a concentration of 50% (Wt%) and potassium dihydrogen phosphate (added at 4% of the mass of the phosphoric acid solution) for 20 minutes and then filtered. The filter material is placed in a microwave heating device. Activated with 500w power for 9 minutes, the other steps are the same as in Example 1, the product activated carbon fiber has an iodine adsorption value of 910mg / g, a methylene blue adsorption capacity of 496mg / g, and a specific surface area of ​​1022m 2 / g, the yield is 51.2%, and the ratio of mesopores is 75.1%.

Embodiment 3

[0035] The cotton was cleaned and placed in a hydrothermal kettle, heated to 150°C for 2 hours at a heating rate of 20°C / min, and the resulting carbonized material was ultrasonically immersed in phosphoric acid and diammonium hydrogen phosphate with a concentration of 40% (Wt%) (Add 4% of the mass of the phosphoric acid solution) The solution is filtered after 3 hours, the filter material is placed in a microwave heating device, 400w power is activated for 12 minutes, the other steps are the same as in Example 1, the product activated carbon fiber has an iodine adsorption value of 1189mg / g , Methylene blue adsorption capacity 393mg / g, specific surface area 1307m 2 / g, the yield is 47.2%, and the ratio of mesopores is 64.7%.

[0036] The above examples show that by controlling the concentration of the activator impregnation solution and the microwave power during the activation process, activated carbon fibers with different mesopore contents can be obtained. Through sample detect...

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Abstract

The invention relates to a method for efficiently preparing cotton based mesoporous activated carbon fiber. The method comprises a step (1) of washing cotton, placing the cotton in a hydrothermal reaction kettle, performing heating to 150-200 DEG C at the heating rate of 5-30 DEG C / min, performing hydrothermal carbonization, performing heat preservation for 1-3 hours and then performing cooling to room temperature; a step (2) of dipping carbonization materials obtained from the step (1) into activator solution, performing microwave-ultrasonic joint dipping for 5-30 minutes and then performing filtration, sending filtration materials to a microwave heating device, performing activation for 5-15 minutes at 250-350 DEG C and then stopping microwave output, and a step (3) of washing the activated materials to be neutral and performing drying to obtain the activated carbon fiber. According to the method, the characteristics of microwave inner heating and selective heating are fully utilized, the technological process is simple, the activation temperature is only 250-350 DEG C, the activation time is only 5-15 minutes, the mesoporous proportion of the activated carbon fiber of the product reaches 50-90%, and the adsorptive property is good.

Description

Technical field [0001] The invention relates to a method for efficiently preparing cotton-based mesoporous activated carbon fibers using cotton as a raw material, and belongs to the field of activated carbon fiber preparation. Background technique [0002] Activated carbon fiber is the third-generation activated carbon product after powder activated carbon and granular activated carbon. It is a kind of porous fibrous adsorption material. It has a large specific surface area, porous structure and strong surface reactivity. Its special fibrous physical The shape makes it have a larger contact area with the adsorbate, has a wide range of adsorption performance and high adsorption capacity, and has a fast adsorption speed and strong regeneration ability. It has a wide range of application prospects in the fields of environment, chemistry, medical treatment, food, electronics, etc. . With the continuous improvement of the manufacturing technology and performance of activated carbon f...

Claims

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Application Information

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IPC IPC(8): C01B31/12D01F9/16
CPCD01F9/16C01P2004/03C01P2004/10C01P2006/12
Inventor 段昕辉梁金生丁燕汤庆国
Owner HEBEI UNIV OF TECH
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