CN102249228B - Method for preparing activated carbon from pinecone - Google Patents

Abstract

The invention discloses a method for preparing activated carbon by using pine cones. The particle size is 1mm ~ 3mm, to obtain pine cone particles; ③ mix the pine cone particles and potassium hydroxide in step ② according to the weight ratio of 1:1 ~ 1:4, and add water to make it soak for 20h ~ 30h, and obtain the mixed material ; ④ put the mixed material in step ③ into a microwave oven for carbonization and activation, the microwave irradiation power is 200W to 700W, and the microwave irradiation time is 5min to 10min to obtain the activated mixed material; ⑤ the activated mixed material in step ④ The mixed materials are sequentially pickled, washed with water, dried and ground to obtain activated carbon. The raw materials of the method of the invention are cheap and easy to obtain, and the production cost of activated carbon is reduced. Moreover, turning waste into wealth makes resource recycling and promotes the development of a low-carbon economy.

Description

Method for preparing activated carbon with pine cones

technical field

The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon with a pine cone.

Background technique

Activated carbon is an extremely important adsorbent, and its excellent properties make it widely used in food processing, pharmaceuticals, chemicals, petroleum refining, bioengineering, energy and environmental protection and other fields. The application of activated carbon in the field of environmental protection is mainly used for the purification of drinking water, the treatment of waste water and the adsorption of toxic and harmful gases. In recent years, environmental pollution has become increasingly serious, and countries all over the world have attached great importance to the deep purification of drinking water, wastewater treatment, and air purification. In my country, with the improvement of national water quality standards, the Yangtze River Delta, Pearl River Delta and other regions have fully covered the activated carbon water purification process to county-level water plants. Therefore, the market prospect of activated carbon at home and abroad is very broad. However, expensive raw materials and production costs keep the price high, so seeking new raw materials for preparing activated carbon has practical significance and commercial prospects.

China is the largest activated carbon producer in the world. The output of activated carbon accounts for one-third of the world's output. The raw materials for preparing activated carbon are mainly non-renewable and expensive resources, such as coal and wood. Coal-based activated carbon accounts for the total output. 60% of the total output, wood activated carbon accounted for 35% of the total output, and shell activated carbon accounted for only 5% of the total output.

At present, there are no reports of using pine cones to prepare activated carbon at home and abroad.

Contents of the invention

The purpose of the present invention is to solve the above problems, and a method for preparing gac with a pine cone with low production cost is provided.

The technical solution for realizing the object of the present invention is: a method for preparing activated carbon with pine cones, which has the following steps: 1. drying the pine cones at a temperature of 100°C to 120°C for 20h to 30h; The pine cone is crushed to a particle size of 1 mm to 3 mm to obtain pine cone particles; ③ the pine cone particles in step ② are mixed with potassium hydroxide in a weight ratio of 1:1 to 1:4, and water is added to impregnate it for 20h to 30h , to obtain the mixed material; ④ place the mixed material in step ③ in a microwave oven for carbonization and activation, the microwave irradiation power is 200W to 700W, and the microwave irradiation time is 5min to 10min to obtain the activated mixed material; ⑤ put the step ④ The activated mixed material is sequentially pickled, washed, dried, and ground to obtain activated carbon.

The weight ratio of the pine cone particles described in the above step 3. to potassium hydroxide is 1: 3～1: 4.

The microwave irradiation power in the above step ④ is 280W-600W, and the microwave irradiation time is 7min-9min.

The pickling described in the above step ⑤ is to use hydrochloric acid with a volume ratio of 1:10 at 80°C to 100°C for 20min to 40min.

The water washing described in the above step ⑤ is to rinse the pickled material with distilled water until the pH is 6.5-7.5.

The pine cone in the above-mentioned steps 1. is preferably taken from the naturally air-dried Korean pine cone in Northeast China.

The present invention has positive effects: the present invention uses pine cones to prepare activated carbon for the first time, not only the raw materials are cheap and easy to obtain, but also the production cost of activated carbon is reduced. Since the pine cones are often thrown away after the pine nuts are processed, the invention also turns wastes into treasures, recycles resources and promotes the development of low-carbon economy.

Detailed ways

(Example 1)

The preparation method of the gac of embodiment has the following steps:

①The naturally air-dried Korean pine cones from Northeast China were dried at 108°C for 24 hours.

② crushing the dried pine cones in step ① to a particle size of about 2 mm to obtain pine cone particles.

③Take 8g of pine cone granules from step ② and mix them with 24g of KOH granules, add 50ml of water and stir evenly, and soak for 24 hours to get the mixed material.

④ Put the mixed material in step ③ into a microwave oven for carbonization and activation for 9 minutes under the microwave irradiation power of 300W to obtain the activated mixed material.

⑤ Cook the activated mixed material in step ④ with hydrochloric acid with a volume ratio of 1:10 (referring to the volume ratio of 36wt% concentrated hydrochloric acid to water volume) at 90°C for 30 minutes, then rinse with distilled water to pH 7, then dried at 120°C, and finally ground to 200 mesh to obtain activated carbon. The iodine adsorption value of this activated carbon was 1253 mg/g.

(Example 2)

The preparation method of the gac of embodiment has the following steps:

①The naturally air-dried Korean pine cones from Northeast China were dried at 108°C for 24 hours.

② crushing the dried pine cones in step ① to a particle size of about 2 mm to obtain pine cone particles.

③Take 8g of pine cone granules from step ② and mix them with 24g of KOH granules, add 50ml of water and stir evenly, and soak for 24 hours to get the mixed material.

④ Put the mixed material in step ③ into a microwave oven for carbonization and activation for 9 minutes under the microwave irradiation power of 560W to obtain the activated mixed material.

⑤ Cook the activated mixed material in step ④ with hydrochloric acid with a volume ratio of 1:10 (referring to the volume ratio of 36wt% concentrated hydrochloric acid to the volume of water) at 90°C for 30 minutes, then rinse with distilled water to pH 7, then dried at 120°C, and finally ground to 200 mesh to obtain activated carbon. The iodine adsorption value of this activated carbon was 1424 mg/g.

Claims (6)

1. a method for preparing gac with pine cone, is characterized in that having the following steps: ①Dry the pine cone at a temperature of 100℃～120℃ for 20h～30h; ② crushing the dried pine cones of step ① to a particle size of 1 mm to 3 mm to obtain pine cone particles; 3. Mix the pine cone granules of step 2. with potassium hydroxide in a weight ratio of 1:1 to 1:4, and add water to soak for 20h to 30h to obtain the mixed material; ④ Put the mixed material in step ③ into a microwave oven for carbonization and activation, the microwave irradiation power is 200W-700W, and the microwave irradiation time is 5min-10min, to obtain the activated mixed material; ⑤ The activated mixed material in step ④ is pickled, washed, dried and ground in sequence to obtain activated carbon. 2. the method for preparing activated carbon with pine cone according to claim 1, is characterized in that: the weight ratio of the pine cone particle described in step 3. and potassium hydroxide is 1: 3～1: 4. 3. The method for preparing activated carbon from pine cones according to claim 1, characterized in that: the microwave irradiation power described in step ④ is 280W-600W, and the microwave irradiation time is 7min-9min. 4. The method for preparing activated carbon with pine cones according to claim 1, characterized in that: the pickling described in step 5 is to boil 20min to 40min at 80°C to 100°C with hydrochloric acid with a volume ratio of 1:10 . 5. The method for preparing activated carbon with pine cones according to claim 1, characterized in that: the water washing described in step ⑤ is to use distilled water to rinse the pickled material until the pH is 6.5 to 7.5. 6. the method for preparing activated carbon with pine cone according to claim 1, is characterized in that: step 1. the pine cone in the middle is the Korean pine pine cone that is taken from the northeast region through natural air-drying.