Preparation method of cotton waste-based magnetic activated carbon

Abstract

The invention discloses a preparation method of a cotton waste-based magnetic activated carbon. The method includes shearing cotton waste to obtain a cotton waste sample, and impregnating the cotton waste sample after a ferrous chloride solution is prepared to obtain a cotton waste impregnated sample; drying the sample in a drying oven, placing in a tubular furnace, carbonizing and activating thecotton waste impregnated sample according to a set activation temperature and activation time under the action of high-purity protective gas, and taking out after cooling to room temperature; adding specific hydrochloric acid, heating to slightly boil, filtering, rinsing with a specific water sample until the pH value of a filtrate reaches the set value; and then drying the sample in an oven to obtain magnetic activated carbon. The method overcomes the defects of high raw material cost, toxicity of an activating agent, difficult recovery, low recycling rate, complicated process and the like inthe existing preparation of the activated carbon. The method uses the cotton waste as a raw material and ferrous chloride as the activating agent, and synchronously activates carbon to rapidly prepare the magnetic activated carbon, and has the characteristics of low raw material cost, green and nontoxic activating agent, high recovery rate and the like.

Description

technical field

[0001] The invention relates to a preparation method of cotton waste-based magnetic activated carbon. Background technique

[0002] China is the world's largest producer and exporter of textiles and clothing. With the development of the textile industry, the amount of waste textiles produced will also increase. It is estimated that the output of waste textiles in my country will be about 22 million tons in 2020, of which about 7 million tons of waste natural fibers account for 31.8% of the total stock. If such a high output cannot be effectively controlled, it will have a significant impact on the environment, and at the same time, it will also be a huge waste of fiber resources. At present, there are mainly two methods of recycling waste natural fibers at home and abroad, energy recovery method and physical recovery method. Among them, the energy recovery method refers to the incineration of waste natural fibers to obtain heat energy and apply it to therma...

Examples

preparation example Construction

[0027] Example figure 1 Shown, the preparation method of cotton waste base magnetic activated carbon of the present invention comprises the steps:

[0028] Step 1. Take the cleaned cotton waste, cut and shred it to obtain a cotton waste sample;

[0029] Step 2, take ferrous chloride by the mass ratio of ferrous chloride and cotton waste sample, and be dissolved in appropriate pure water and be made into ferrous chloride solution, then determine by the solid-liquid ratio of cotton waste sample and pure water After soaking the cotton waste sample, take it out after sealing for 24 h, and obtain the cotton waste impregnated sample;

[0030] Step 3, put the cotton waste impregnated sample into the drying box, and dry it at a certain temperature for 8 h;

[0031] Step 4. Place the dried cotton waste impregnated sample in a tube furnace, set the activation temperature and activation time under the action of 100 mL / min high-purity protective gas, carbonize and activate the cotton wa...

Embodiment 1

[0041] Take the washed cotton waste, cut and shred it to about 0.5 cm in size, then weigh ferrous chloride according to the mass ratio of 2:1 (ferrous chloride: cotton waste), and dissolve it in about 20 mL of pure Make a ferrous chloride solution in water, and then adjust the volume according to the solid-liquid ratio (cotton waste: pure water) of 1:10, and use it to impregnate cotton waste. After sealing for 24 hours, take it out and put it in a vacuum drying oven at 65°C. Then, the dried sample was taken out and placed in a tube furnace, using high-purity nitrogen as a protective gas, the gas flow rate was 100 mL / min, the activation temperature and activation time were 700 °C and 2 h, respectively, and the heating rate was maintained at 10 °C. ℃ / min, take it out after cooling to room temperature. Put the sample taken out from the tube furnace into 1+9 HCl, heat to a slight boil for 10 minutes, then filter, rinse with pure water until the filtrate pH=7, and finally dry it in...

Embodiment 2～9

[0043] On the basis of embodiment 1, obtain embodiment 2~9 according to table 1;

[0044] Table 1 Parameter table of embodiments 2 to 9

[0045] Example

mass ratio

Activation temperature / ℃

Activation time / h

Micro boiling time / min

2

0.5

700

2

10

3

3

700

2

10

4

2

500

2

10

5

2

800

2

10

6

2

700

0.5

10

7

2

700

3

10

8

2

700

2

3

9

2

700

2

5

[0046] like figure 2 As shown, adopt the Hitachi S-8400 scanning electron microscope to observe the morphology characteristics of the activated carbon material obtained by embodiment 1.

[0047] As shown in Fig. 3 (a), (b), adopt Quantachrome / autosorb-iQ-2MP (U.S.A.) to measure the N of the activated carbon material that obtains by embodiment 1 automatically 2 The adsorption-desorption isotherm curve and pore size distribution were calculated to obtain the specific surfac...

technical field

[0001] The invention relates to a preparation method of cotton waste-based magnetic activated carbon. Background technique

[0002] China is the world's largest producer and exporter of textiles and clothing. With the development of the textile industry, the amount of waste textiles produced will also increase. It is estimated that the output of waste textiles in my country will be about 22 million tons in 2020, of which about 7 million tons of waste natural fibers account for 31.8% of the total stock. If such a high output cannot be effectively controlled, it will have a significant impact on the environment, and at the same time, it will also be a huge waste of fiber resources. At present, there are mainly two methods of recycling waste natural fibers at home and abroad, energy recovery method and physical recovery method. Among them, the energy recovery method refers to the incineration of waste natural fibers to obtain heat energy and apply it to therma...

Examples

preparation example Construction

[0027] Example figure 1 Shown, the preparation method of cotton waste base magnetic activated carbon of the present invention comprises the steps:

[0028] Step 1. Take the cleaned cotton waste, cut and shred it to obtain a cotton waste sample;

[0029] Step 2, take ferrous chloride by the mass ratio of ferrous chloride and cotton waste sample, and be dissolved in appropriate pure water and be made into ferrous chloride solution, then determine by the solid-liquid ratio of cotton waste sample and pure water After soaking the cotton waste sample, take it out after sealing for 24 h, and obtain the cotton waste impregnated sample;

[0030] Step 3, put the cotton waste impregnated sample into the drying box, and dry it at a certain temperature for 8 h;

[0031] Step 4. Place the dried cotton waste impregnated sample in a tube furnace, set the activation temperature and activation time under the action of 100 mL / min high-purity protective gas, carbonize and activate the cotton wa...

Embodiment 1

[0041] Take the washed cotton waste, cut and shred it to about 0.5 cm in size, then weigh ferrous chloride according to the mass ratio of 2:1 (ferrous chloride: cotton waste), and dissolve it in about 20 mL of pure Make a ferrous chloride solution in water, and then adjust the volume according to the solid-liquid ratio (cotton waste: pure water) of 1:10, and use it to impregnate cotton waste. After sealing for 24 hours, take it out and put it in a vacuum drying oven at 65°C. Then, the dried sample was taken out and placed in a tube furnace, using high-purity nitrogen as a protective gas, the gas flow rate was 100 mL / min, the activation temperature and activation time were 700 °C and 2 h, respectively, and the heating rate was maintained at 10 °C. ℃ / min, take it out after cooling to room temperature. Put the sample taken out from the tube furnace into 1+9 HCl, heat to a slight boil for 10 minutes, then filter, rinse with pure water until the filtrate pH=7, and finally dry it in...

Embodiment 2～9

[0043] On the basis of embodiment 1, obtain embodiment 2~9 according to table 1;

[0044] Table 1 Parameter table of embodiments 2 to 9

[0045] Example

mass ratio

Activation temperature / ℃

Activation time / h

Micro boiling time / min

2

0.5

700

2

10

3

3

700

2

10

4

2

500

2

10

5

2

800

2

10

6

2

700

0.5

10

7

2

700

3

10

8

2

700

2

3

9

2

700

2

5

[0046] like figure 2 As shown, adopt the Hitachi S-8400 scanning electron microscope to observe the morphology characteristics of the activated carbon material obtained by embodiment 1.

[0047] As shown in Fig. 3 (a), (b), adopt Quantachrome / autosorb-iQ-2MP (U.S.A.) to measure the N of the activated carbon material that obtains by embodiment 1 automatically 2 The adsorption-desorption isotherm curve and pore size distribution were calculated to obtain the specific surfac...

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