Method for preparing active carbon from straw stalk

A technology for preparing activated carbon and rice straw, which is applied in the field of preparing activated carbon from rice straw, can solve the problems of low calorific value, low nutritional value, and unsuitability for returning to the field of rice straw, and achieves the advantages of simple preparation process, good adsorption performance, and good industrial application prospects Effect

Inactive Publication Date: 2009-07-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, other materials are used as industrial raw materials, but the total amount is still less than 40%. There are still a large amount of residues that cannot be used and are burned every year, which has a huge impact on the environment.
In addition, compared with other crop straws, rice straw has low calorific value and high carbon-to-nitrogen ratio (low nutritional value), so it is neither suitable for use as fuel nor for returning to the field.

Method used

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  • Method for preparing active carbon from straw stalk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Wash the collected rice straw with 2wt% NaOH solution, dry it at 105°C, and grind the rice straw into 100-mesh rice straw powder with a pulverizer, mix the rice straw powder with 30% diammonium hydrogen phosphate solution at a ratio of 1:3 After soaking for 12 hours, put the soaked rice straw powder into a vacuum drying oven for drying and put it into a tube furnace. Under the protection of a nitrogen flow of 50mL / min, the temperature is raised to 600°C at 20°C / min, and the At this temperature, it was activated at a constant temperature for 60 minutes. After activation, cool to room temperature and wash with distilled water to pH=6.5. Finally, put the clean product into a vacuum oven and dry it at 105°C to obtain activated carbon.

[0025] According to the national standard (GB / T 12496.10-1999) test, the adsorption value of methylene blue is 220mL / g, and the adsorption value of the national standard methylene blue is 120mL / g. The value is 1.83 times the first-level st...

Embodiment 2

[0027] Wash the collected rice straw with 2wt% NaOH solution, dry it at 105°C, cut the rice straw into a length of 3-5 cm with a cutting machine, soak the rice straw with 50% phosphoric acid solution at a mass ratio of 1:3 After 24 hours, put the soaked rice straw into a vacuum drying oven for drying and put it into a tube furnace. Under the protection of a nitrogen flow of 50mL / min, the temperature is raised to 700°C at 20°C / min, and at this temperature Constant temperature activation for 60min. After activation, cool to room temperature and wash with distilled water to pH=6.5. Finally, put the clean product into a vacuum oven and dry it at 105°C to obtain activated carbon.

[0028] Test according to national standard (GB / T 12496.10-1999), the adsorption value of methylene blue is 195mL / g, the adsorption value of national standard methylene blue is 120mL / g, the activated carbon product methylene blue adsorption of this example production The value is 1.63 times the first-le...

Embodiment 3

[0030] Wash the collected rice straw with 2wt% NaOH solution, dry it at 105°C, and grind the rice straw into 100-mesh rice straw powder with a pulverizer. The mass ratio was soaked for 12 hours, and the soaked rice straw powder was dried in a vacuum drying oven and then placed in a tube furnace. Under the protection of a nitrogen flow of 50mL / min, the temperature was raised to 700°C at 20°C / min, and the At this temperature, it was activated at a constant temperature for 60 minutes. After activation, cool to room temperature and wash with distilled water to pH=6.5. Finally, put the clean product into a vacuum oven and dry it at 105°C to obtain activated carbon.

[0031] Test according to national standard (GB / T 12496.10-1999), the adsorption value of methylene blue is 260mL / g, the adsorption value of national standard methylene blue is 120mL / g, the activated carbon product methylene blue adsorption of this example production The value is 3.17 times the first-level standard of...

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Abstract

The invention relates to a method for preparing active carbon from rice straw. The method comprises taht: (1) the collected rice straw is subjected to alkali cleaning, cleaned to neutrality, dried, and cut or pulverized; (2) the rice straw is added into an activator solution, evenly stirred, soaked for 12 to 24 hours, subjected to solid-liquid separation, cleaned and dried; (3) the rice straw prepared in step (2) is put in a barrate type oven and pre-oxygenated for 1 to 2 hours; (4) the pre-oxygenated rice straw is put in a tube-type carbide furnace, heated for temperature rise under the protection of nitrogen gas, and activated; and (5) the activated rice straw is washed by water till pH is between 6.5 and 7.5, and dried at 105 DEG C to prepare the active carbon. The active carbon prepared by the method has good adsorption performance; the adsorptive value of methylthionine chloride reaches between 200 and 300 mL/g; and the preparation process is simple, economical and environment-friendly, meets requirement of clean production and circular economy development, and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of active carbon preparation, in particular to a method for preparing active carbon with rice straw. Background technique [0002] Activated carbon is a material with developed pore structure and large specific surface area. It has strong adsorption capacity for organic matter or heavy metals and colloidal particles in gas and solution. It is insoluble in water or organic solvents. It can be recycled and reused. It has sufficient chemical properties. Stability, mechanical strength, acid and alkali resistance, heat resistance and other properties. Widely used in environmental protection, food, medicine, catalysis, separation, and national defense, it has become an important functional material that is indispensable for national economic development, national defense construction, and life. [0003] Rice production occupies a large proportion in my country's agricultural production, and a large amount of straw is produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 韩彬周美华吴思芬史智国王元庆荣达
Owner DONGHUA UNIV
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