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Method for preparing activated carbon from wheat straw waste residues obtained through xylitol preparation technology

A technology for preparing activated carbon and a preparation process, which is applied in the field of agricultural waste recycling and reuse, and can solve the problems of low added value of treatment methods and the like

Active Publication Date: 2016-04-20
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the added value of the latter processing method is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Add 5g of wheat straw waste residue to the crucible, take 0.05g of boric acid, 10ml of 50% phosphoric acid, and soak in a constant temperature water bath at 90°C for 1.5 hours under the uniform stirring of an automatic stirrer; take out the soaked sample, and then put it in a muffle at 420°C After keeping warm in the furnace for 1 hour, take it out and cool it, then grind it slightly for 5 minutes, wash it with hot water until it is neutral, dry it at 105°C, cool it and grind it to powder, and get 2.24g of powdered activated carbon with a specific surface area of ​​878m 2 / g, boil the powdered activated carbon in 1mol / L HCl solution for 1h, then wash the filtrate with water until it becomes neutral, and dry it at 105°C for 8h to obtain activated activated carbon, and the measured specific surface area is 1245m 2 / g, the average pore size is 5-15nm, the yield of activated carbon is 44.8%, and the consumption of phosphoric acid is 1.2%.

[0035] When the activated carbon i...

Embodiment 2

[0037] Add 5g of wheat straw waste residue to the crucible, take 0.05g of boric acid and 10ml of 50% phosphoric acid, and soak it in a constant temperature water bath at 80°C for 1 hour under the uniform stirring of an automatic stirrer; take out the soaked sample, and then put it in a muffle at 500°C After keeping warm in the furnace for 1 hour, take it out and cool it, then grind it slightly for 4 minutes, wash it with hot water until neutral, dry it at 110°C, cool it and grind it to powder, and get 2.145g of powdered activated carbon with a specific surface area of ​​953m 2 / g, boil the powdered activated carbon in 1mol / L HCl solution for 1.2h, then wash the filtrate with water until it is neutral, and dry it at 105°C for 8h to obtain activated activated carbon, and the measured specific surface area is 1348m 2 / g, the average pore size is 5-10nm, the yield of activated carbon is 42.9%, and the consumption of phosphoric acid is 1.25%.

[0038] When the activated carbon is a...

Embodiment 3

[0040] Add 4g of wheat straw waste residue to the crucible, take 0.04g of boric acid and 8ml of 50% phosphoric acid, heat it in a muffle furnace at 500°C for 1 hour, then grind it slightly for 3 minutes, wash the neutral paper with hot water, and bake it at 110°C Dry, grind to powder, get powdered activated carbon 1.784g, specific surface area 1060m 2 / g, boil the powdered activated carbon in 1mol / L HCl solution for 1.3h, then wash the filtrate with water until it is neutral, and dry it at 106°C for 8h to obtain activated activated carbon, and the measured specific surface area is 1440m 2 / g, the pore size is 3-14nm, the yield of activated carbon is 44.6%, and the consumption of phosphoric acid is 1.3%.

[0041] When the activated carbon is applied to the decolorization and detoxification of the high-temperature hydrolyzate of wheat straw, the amount of activated carbon added is 0.6% of the mass of the hydrolyzate, the decolorization temperature is 40° C., and the decolorizati...

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Abstract

The invention discloses a method for preparing activated carbon from wheat straw waste residues obtained through an xylitol preparation technology. The method includes the following steps that 1, the wheat straw waste residues are screened, a phosphoric acid solution and a set amount of boric acid are added and mixed uniformly, and the wheat straw waste residues are soaked at the temperature of 70 DEG C-90 DEG C; 2, the soaked sample is taken out and put into a muffle furnace, and the temperature is kept at 450 DEG C-550 DEG C for 0.5-2 h; 3, the wheat straw waste residues carbonized in the step 2 are ground and cleaned to be neutral; 4, powdered activated carbon can be obtained by drying and grinding the neutral activated carbon in the step 3; 5, the activated carbon obtained in the step 4 is activated with a HCl solution to obtain the activated carbon. The wheat straw waste residues from which hemicellulose is extracted are prepared into the powdered activated carbon through a simple chemical physics method, the powdered activated carbon is used for decoloration and detoxification in the process of extracting hemicellulose from a wheat straw raw material to prepare xylooligosaccharide, and high-value utilization of the wheat straw raw material is achieved.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of agricultural waste, and in particular relates to a method for preparing activated carbon from wheat straw waste residue after a xylitol preparation process. Background technique [0002] Wheat straw is an agricultural waste in wheat-producing areas in northern my country, which is rich in cellulose, hemicellulose and lignin. On the one hand, wheat straw can be used to make pulp and paper through chemical, physical chemical, and biochemical methods; Detoxification and decolorization, and then use chemical, biological, or biochemical methods to degrade pentosan to small molecular xylooligosaccharides, and then prepare xylitol after hydrogenation to meet the needs of modern people for high-quality life. The process of preparing xylitol from wheat straw will produce a large amount of waste residue, the main components of which are cellulose and lignin. The main methods to deal with the waste resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
CPCC01P2006/12C01P2006/16
Inventor 马浩吉兴香陈嘉川田中建刘珊珊杨桂花
Owner QILU UNIV OF TECH
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