A bacterial cellulose membrane/porous carbon adsorbent and its preparation

Abstract

The invention discloses a bacterial cellulose membrane / porous carbon adsorbent and its preparation. The adsorbent uses bacterial cellulose membrane as a substrate, and different sugars as carbon sources. The bacterial cellulose membrane / porous carbon adsorbent is prepared by hydrothermal carbonization. Due to the anchoring effect of a large number of hydroxyl groups on the surface of bacterial cellulose, the porous carbon It can be better dispersed in the bacterial fiber membrane, and at the same time, different sizes of nanopores can be obtained by adjusting the growth process of the cellulose membrane. The adsorbent of the present invention combines the dual functions of membrane nano-pore filtration and porous carbon adsorption, and is used to adsorb and remove PM2.5 smoke dust and toxic gases. The adsorbent has the advantages of environmental protection and high efficiency.

Description

technical field

[0001] The invention relates to an adsorbent for removing PM2.5 smoke dust and toxic gas, in particular to a bacterial cellulose membrane / porous carbon adsorbent and a preparation method thereof. Background technique

[0002] In recent years, my country's air pollution has become more and more serious, especially the smog phenomenon has become a major killer that threatens people's normal life. Studies have found that the main cause of the smog phenomenon is the existence of a large number of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particulate matter that can enter the lungs. It mainly comes from the residues discharged from combustion in the process of daily power generation, industrial production, and automobile exhaust emissions. Due to the small particle size, large specific surface area and strong activity, the particles are easy to be accompanied by toxic and harmful s...

Examples

Embodiment 1

[0035] Step 1: Acetobacter xylinum is used for seed amplification, cultured on a shaking table, the culture temperature is 30°C, the speed of the shaker is 160 rpm, and the culture time is 36 hours;

[0036] Step 2: Add 10 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 1 g / L calcium carbonate, sonicate for 60 minutes, and sterilize at 121°C for 20 minutes , cooled to room temperature;

[0037] Step 3: Acetobacter xylinum is inoculated with an inoculum of 8%, cultured after inoculation, and cultivated for 5 days;

[0038] Step 4: After the fermentation is over, use NaOH with a mass fraction of 3 g / L and H at 3 g / L 2 o 2 Water bath at 80°C for 3.0 hours to remove residual cells and fermentation broth;

[0039] Step 5: Soak the BC membrane with 20 g / L acetic acid for 24 h to remove the calcium carbonate embedded in the cellulose network;

[0040] Step 6: Rinse the BC membrane with...

Embodiment 2

[0042] The first step: Acetobacter xylinum is used for seed amplification, cultured on a shaker, the culture temperature is 29°C, the speed of the shaker is 160rpm, and the culture time is 36 hours;

[0043] Step 2: Add 10 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 3 g / L calcium carbonate, sonicate for 20 minutes, and sterilize at 115°C for 25 minutes , cooled to room temperature;

[0044] Step 3: Acetobacter xylinum is inoculated with an inoculum of 8%, cultured after inoculation, and cultivated for 5 days;

[0045] Step 4: After the fermentation is over, use 4 g / L of NaOH and 4 g / L of H 2 o 2 Water bath at 85°C for 2.0 hours to remove residual cells and fermentation broth;

[0046] Step 5: Soak the BC membrane with 30 g / L acetic acid for 24 h to remove the calcium carbonate embedded in the cellulose network;

[0047] Step 6: Rinse the BC membrane with deionized water unti...

Embodiment 3

[0049] The first step: Acetobacter xylinum is used for seed amplification, cultured on a shaking table, the culture temperature is 31°C, the speed of the shaker is 160 rpm, and the culture time is 42 hours;

[0050] Step 2: Add 15 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 4 g / L calcium carbonate, sterilize at 121°C for 15 minutes, and cool to room temperature;

[0051] The third step: Acetobacter xylinum is inoculated with 10% inoculation amount, and after inoculation, it is cultured statically and cultivated for 7 days;

[0052] Step 4: After the fermentation is over, use a NaOH solution with a mass fraction of 5 g / L and 5 g / L of H 2 o 2 Water bath at 75°C for 3.0 hours to remove residual cells and fermentation broth;

[0053] Step 5: Soak the BC membrane with 40 g / L acetic acid for 36 h to remove the calcium carbonate embedded in the cellulose network;

[0054] Step 6: R...

technical field

[0001] The invention relates to an adsorbent for removing PM2.5 smoke dust and toxic gas, in particular to a bacterial cellulose membrane / porous carbon adsorbent and a preparation method thereof. Background technique

[0002] In recent years, my country's air pollution has become more and more serious, especially the smog phenomenon has become a major killer that threatens people's normal life. Studies have found that the main cause of the smog phenomenon is the existence of a large number of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particulate matter that can enter the lungs. It mainly comes from the residues discharged from combustion in the process of daily power generation, industrial production, and automobile exhaust emissions. Due to the small particle size, large specific surface area and strong activity, the particles are easy to be accompanied by toxic and harmful s...

Examples

Embodiment 1

[0035] Step 1: Acetobacter xylinum is used for seed amplification, cultured on a shaking table, the culture temperature is 30°C, the speed of the shaker is 160 rpm, and the culture time is 36 hours;

[0036] Step 2: Add 10 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 1 g / L calcium carbonate, sonicate for 60 minutes, and sterilize at 121°C for 20 minutes , cooled to room temperature;

[0037] Step 3: Acetobacter xylinum is inoculated with an inoculum of 8%, cultured after inoculation, and cultivated for 5 days;

[0038] Step 4: After the fermentation is over, use NaOH with a mass fraction of 3 g / L and H at 3 g / L 2 o 2 Water bath at 80°C for 3.0 hours to remove residual cells and fermentation broth;

[0039] Step 5: Soak the BC membrane with 20 g / L acetic acid for 24 h to remove the calcium carbonate embedded in the cellulose network;

[0040] Step 6: Rinse the BC membrane with...

Embodiment 2

[0042] The first step: Acetobacter xylinum is used for seed amplification, cultured on a shaker, the culture temperature is 29°C, the speed of the shaker is 160rpm, and the culture time is 36 hours;

[0043] Step 2: Add 10 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 3 g / L calcium carbonate, sonicate for 20 minutes, and sterilize at 115°C for 25 minutes , cooled to room temperature;

[0044] Step 3: Acetobacter xylinum is inoculated with an inoculum of 8%, cultured after inoculation, and cultivated for 5 days;

[0045] Step 4: After the fermentation is over, use 4 g / L of NaOH and 4 g / L of H 2 o 2 Water bath at 85°C for 2.0 hours to remove residual cells and fermentation broth;

[0046] Step 5: Soak the BC membrane with 30 g / L acetic acid for 24 h to remove the calcium carbonate embedded in the cellulose network;

[0047] Step 6: Rinse the BC membrane with deionized water unti...

Embodiment 3

[0049] The first step: Acetobacter xylinum is used for seed amplification, cultured on a shaking table, the culture temperature is 31°C, the speed of the shaker is 160 rpm, and the culture time is 42 hours;

[0050] Step 2: Add 15 g / L sodium carboxymethyl cellulose when preparing the fermentation broth; after the sodium carboxymethyl cellulose is completely dissolved, add 4 g / L calcium carbonate, sterilize at 121°C for 15 minutes, and cool to room temperature;

[0051] The third step: Acetobacter xylinum is inoculated with 10% inoculation amount, and after inoculation, it is cultured statically and cultivated for 7 days;

[0052] Step 4: After the fermentation is over, use a NaOH solution with a mass fraction of 5 g / L and 5 g / L of H 2 o 2 Water bath at 75°C for 3.0 hours to remove residual cells and fermentation broth;

[0053] Step 5: Soak the BC membrane with 40 g / L acetic acid for 36 h to remove the calcium carbonate embedded in the cellulose network;

[0054] Step 6: R...

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