Method for preparing active carbon from ramie stalks

A technology for preparing activated carbon and hemp rods, which can be used in the removal of solid wastes, etc., can solve problems such as hidden dangers of aircraft safety, affecting crop growth, and hindering cultivation, and achieves the effects of low price, developed mesopores, and high adsorption value.

Inactive Publication Date: 2011-07-20
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, for a long time, farmers have discarded the hemp stalks in the fields and fields after harvesting the ramie bast fibers, causing a lot of waste, which not only hinders subsequent cultivat...

Method used

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  • Method for preparing active carbon from ramie stalks
  • Method for preparing active carbon from ramie stalks
  • Method for preparing active carbon from ramie stalks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Wash the ramie stalks with water for several times to remove the impurities attached to the stalks, dry them at 105±5°C, cut them and crush them in a pulverizer until the stalks have a particle size of 50-200 mesh; and dry the ramie The hemp stalk raw material particles were placed in a concentration of 60% H 3 PO 4 The solution was soaked for 12 hours, the dipping ratio was 1, and the carbonized ramie stalk particles were obtained after dehydration by a centrifuge. These carbonized particles are then placed in a tubular carbonization furnace for high-temperature activation treatment. The heating rate is 10°C / min, and after reaching the set temperature of 700°C, keep it warm for 1 hour, and take it out after cooling to room temperature. Wash with hydrochloric acid and distilled water at 70°C until the pH of the filtrate is 6.5-7, and dry to obtain activated carbon with ramie stalks as raw materials.

Embodiment 2

[0022] Wash the ramie stalks with water for several times to remove the impurities attached to the stalks, dry them at 105±5°C, cut them and crush them in a pulverizer until the stalks have a particle size of 50-200 mesh; and dry the ramie The raw material particles of hemp stalks are placed in 60% ZnCl 2 The solution was soaked for 12 hours, the dipping ratio was 1, and the carbonized ramie stalk particles were obtained after dehydration by a centrifuge. These carbonized particles are then placed in a tubular carbonization furnace for high-temperature activation treatment. The heating rate is 10°C / min, and after reaching the set temperature of 700°C, keep it warm for 1 hour, and take it out after cooling to room temperature. Wash with hydrochloric acid and distilled water at 70°C until the pH of the filtrate is 6.5-7, and dry to obtain activated carbon with ramie stalks as raw materials.

Embodiment 3

[0024] Wash the ramie stalks with water for several times to remove the impurities attached to the stalks, dry them at 105±5°C, cut them and crush them in a pulverizer until the stalks have a particle size of 50-200 mesh; and dry the ramie Raw material particles of ramie stalks were impregnated in 60% KOH solution for 12 hours with an impregnation ratio of 1, dehydrated by a centrifuge to obtain carbonized ramie stalk particles. These carbonized particles are then placed in a tubular carbonization furnace for high-temperature activation treatment. The heating rate is 10°C / min, and after reaching the set temperature of 750°C, keep it warm for 1 hour, and take it out after cooling to room temperature. Wash with hydrochloric acid and distilled water at 70°C until the pH of the filtrate is 6.5-7, and dry to obtain activated carbon with ramie stalks as raw materials. figure 2 It is a scanning electron microscope image of activated carbon prepared by the method described in this e...

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Abstract

The invention relates to a method for preparing active carbon from ramie stalks. The method is simple, economical and environmentally-friendly, and the obtained active carbon has well-developed mesopores, high iodine adsorption value and high methylene blue adsorption value. The method comprises the following specific steps of: (1) smashing ramie stalks into particles of between 50 meshes and 200 meshes, carbonizing at the temperature of between 400 DEG C and 600 DEG C for 60-120 minutes, cooling to room temperature and extracting the particles out to obtain primary carbon; (2) putting the primary carbon into a soaking solution with the concentration of between 30 percent by mass and 70 percent by mass for soaking in the soaking ratio of between 1 and 4 for 12 hours, and dehydrating by using a centrifuge to obtain ramie stalk carbonized particles; and (3) putting the carbonized particles into a tubular carbonization furnace, heating to 700-900 DEG C at the temperature raising speed of between 5 DEG C per minute and 30 DEG C per minute, preserving heat for 45-120 minutes, cooling to room temperature, extracting the carbonized particles out, neutralizing with acid or alkali, cleaning with pure water until the pH value is between 6.5 and 7, and drying to obtain active carbon taking the ramie stalks as a raw material.

Description

technical field [0001] The invention relates to a method for preparing activated carbon from ramie stalks. Background technique [0002] Activated carbon has broad application prospects in the fields of catalysis, adsorption, and new energy. It has the characteristics of large specific surface area, good electrical and thermal conductivity, good chemical stability, and low price, and has attracted widespread attention. At present, the domestic preparation of activated carbon mainly uses wood and high-quality coal as raw materials, and the production cost is relatively high. In recent years, the use of various industrial and agricultural wastes such as coconut shells, almond shells, walnut shells, rice husks, etc. has been widely reported for the preparation of activated carbon. However, the research on the preparation of activated carbon from hemp plants has only recently been reported. my country is the main producer of hemp, and the industry mainly uses hemp fiber to mak...

Claims

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Application Information

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IPC IPC(8): C01B31/12B09B3/00
Inventor 陈悟曾庆福王训阶祝荻崔友明李玉广蔡映杰耿世洲
Owner WUHAN TEXTILE UNIV
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