Difference between revisions of "Activated carbon"
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| − | [[File:Activated charcoal pellets sample.jpg|thumb| | + | [[File:Activated charcoal pellets sample.jpg|thumb|320px|Activated charcoal pellets from an old gas mask filter.]] |
'''Activated carbon''' or '''activated charcoal''', '''activated coal''' or simply '''active carbon''' a form of [[carbon]] or [[charcoal]] processed to have small, low-volume pores, to increase the surface area available for adsorption or chemical reactions. | '''Activated carbon''' or '''activated charcoal''', '''activated coal''' or simply '''active carbon''' a form of [[carbon]] or [[charcoal]] processed to have small, low-volume pores, to increase the surface area available for adsorption or chemical reactions. | ||
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==Properties== | ==Properties== | ||
| − | Activated carbon is a black solid with a grayish luster, with a very high specific surface (500-5000 m<sup>2</sup>/g). Its high specific surface allows it to adsorb various gasses and liquids, as well as small size particles, a property widely exploited in water purification. While it's generally encountered as a powder, | + | Activated carbon is a black solid with a grayish luster, with a very high specific surface (500-5000 m<sup>2</sup>/g). Its high specific surface allows it to adsorb various gasses and liquids, as well as small size particles, a property widely exploited in water purification. While it's generally encountered as a powder, activated charcoal is also available as pellets or beads. It is insoluble in all solvents and will burn in air if ignited, though it does not ignite very easy. |
Activated charcoal is sometimes used as a catalyst in various chemical reactions. | Activated charcoal is sometimes used as a catalyst in various chemical reactions. | ||
==Availability== | ==Availability== | ||
| − | Powdered activated charcoal is sold in various pharmacies. | + | Powdered activated charcoal is sold in various pharmacies. It can also be bought from a vet or from pet shops. |
| − | Gas | + | Gas mask filters tend to contain activated carbon in pellet form. |
Some old hard drives also contain activated charcoal as either beads or powder, in a small plastic vial, glued inside. | Some old hard drives also contain activated charcoal as either beads or powder, in a small plastic vial, glued inside. | ||
==Preparation== | ==Preparation== | ||
| − | Activated charcoal can be made from common charcoal or sugar charcoal (made by dehydrating [[sugar]] with concentrated [[sulfuric acid]]), | + | Activated charcoal can be made from common charcoal or sugar charcoal (made by dehydrating [[sugar]] with concentrated [[sulfuric acid]]), by treating it with superheated steam (some sources say 800-900 °C) or with hot phosphoric acid. Boiling charcoal in water will also activate it, although this type of activated charcoal, while better than untreated charcoal, is still inferior to the OTC type. |
| + | |||
| + | However, activating the charcoal at home is generally not worth the effort and it's much cheaper to simply just purchase it from the store. | ||
==Projects== | ==Projects== | ||
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*Make an air purification system | *Make an air purification system | ||
*Absorb toxic spills | *Absorb toxic spills | ||
| + | *Remove unpleasant smell from room | ||
==Handling== | ==Handling== | ||
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*[http://www.sciencemadness.org/talk/viewthread.php?tid=17916 Activated charcoal and ammonia] | *[http://www.sciencemadness.org/talk/viewthread.php?tid=17916 Activated charcoal and ammonia] | ||
*[http://www.sciencemadness.org/talk/viewthread.php?tid=63161 Activated Carbon as a fume filter: What DOESN'T it absorb?] | *[http://www.sciencemadness.org/talk/viewthread.php?tid=63161 Activated Carbon as a fume filter: What DOESN'T it absorb?] | ||
| + | *[http://www.sciencemadness.org/talk/viewthread.php?tid=63181 Activated Carbon and Charcoal (AC)] | ||
| + | *[http://www.sciencemadness.org/talk/viewthread.php?tid=131526 How to clean up Active Charcoal in the lab?] | ||
[[Category:Materials with no specific chemical formula]] | [[Category:Materials with no specific chemical formula]] | ||
| − | [[Category: | + | [[Category:Porous materials]] |
[[Category:Granular materials]] | [[Category:Granular materials]] | ||
| + | [[Category:Carbon compounds]] | ||
[[Category:Lab equipment]] | [[Category:Lab equipment]] | ||
[[Category:Desiccants]] | [[Category:Desiccants]] | ||
[[Category:Readily available chemicals]] | [[Category:Readily available chemicals]] | ||
[[Category:Materials available as food grade]] | [[Category:Materials available as food grade]] | ||
| + | [[Category:Essential reagents]] | ||
Latest revision as of 15:20, 18 November 2023
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Activated carbon or activated charcoal, activated coal or simply active carbon a form of carbon or charcoal processed to have small, low-volume pores, to increase the surface area available for adsorption or chemical reactions.
Generally, the main difference between normal charcoal and activated charcoal is that the latter has its microstructure specially engineered for maximum specific surface and high adsorbtion. Sometimes further chemical treatment is used to enhances adsorption properties.
Contents
Types
The most common forms of activated carbon encountered are powder and pellets. The pellet form has the advantage of better mechanical stability and as such is commonly used in various filters.
Properties
Activated carbon is a black solid with a grayish luster, with a very high specific surface (500-5000 m2/g). Its high specific surface allows it to adsorb various gasses and liquids, as well as small size particles, a property widely exploited in water purification. While it's generally encountered as a powder, activated charcoal is also available as pellets or beads. It is insoluble in all solvents and will burn in air if ignited, though it does not ignite very easy.
Activated charcoal is sometimes used as a catalyst in various chemical reactions.
Availability
Powdered activated charcoal is sold in various pharmacies. It can also be bought from a vet or from pet shops.
Gas mask filters tend to contain activated carbon in pellet form.
Some old hard drives also contain activated charcoal as either beads or powder, in a small plastic vial, glued inside.
Preparation
Activated charcoal can be made from common charcoal or sugar charcoal (made by dehydrating sugar with concentrated sulfuric acid), by treating it with superheated steam (some sources say 800-900 °C) or with hot phosphoric acid. Boiling charcoal in water will also activate it, although this type of activated charcoal, while better than untreated charcoal, is still inferior to the OTC type.
However, activating the charcoal at home is generally not worth the effort and it's much cheaper to simply just purchase it from the store.
Projects
- Water purification
- Clean various liquids from small particles
- Make a gas mask
- Make an air purification system
- Absorb toxic spills
- Remove unpleasant smell from room
Handling
Safety
Activated charcoal is considered safe and it's also approved for medical use. Finely powdered activated charcoal may form explosive mixtures with air in confined places.
Storage
Activated carbon should be stored in closed bottles, to prevent it from adsorbing various gasses and liquids from air. Try to avoid storing it near volatile chemicals and avoid storage near strong oxidizers.
Disposal
Activated carbon generally does not require special disposal and can be dumped in trash. If it adsorbed toxic compounds, special disposal may be required.
If it adsorbed just gasses or liquids, it's advised to regenerate it by heating the activated carbon to 100-200 °C and let it cool in a clean air environment.
