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| Activated carbon | |
|---|---|
| Name | Activated carbon |
| Caption | Granular activated carbon |
| Other names | Activated charcoal |
| Chemical formula | C (amorphous) |
| Density | variable |
| Appearance | Black, porous solid |
| Uses | Adsorbent, filtration, purification |
Activated carbon is a highly porous form of carbon with extensive internal surface area used as an adsorbent in purification, separation, and catalysis. It appears as black granules, powders, extrudates, or monoliths and is produced from carbonaceous precursors through thermal and chemical activation. Common industrial and laboratory uses span water treatment, air purification, pharmaceutical processes, analytical chemistry, and emergency medicine.
Activated carbon is deployed across sectors including municipal United Nations programs, industrial European Union regulations, and public health initiatives in World Health Organization contexts for removing contaminants. Commercial suppliers operate in markets influenced by entities such as Dow Chemical Company, Calgon Carbon Corporation, and Cabot Corporation while standards are set by organizations like American Chemical Society, International Organization for Standardization, and American Water Works Association. Research institutions including Massachusetts Institute of Technology, Imperial College London, ETH Zurich, and University of Tokyo investigate novel precursors and engineered pore structures.
The use of carbonaceous adsorbents dates to ancient Egypt and Mesopotamia for water and medicinal uses, with documented applications in Hippocrates era remedies and later in Middle Ages Europe. Industrial development accelerated during the 19th century with contributions linked to figures and events such as the Industrial Revolution, the rise of chemical firms like BASF, and wartime demands exemplified by filtration work in World War I and World War II. Modern activated carbon technology evolved through patents and commercialization by companies like Calgon and academic advances at institutions including University of Manchester.
Feedstocks originate from sources tied to regional economies: Coconut shells (dominant in Philippines and Sri Lanka markets), coal from Powder River Basin suppliers, lignite from Germany and Poland, wood from forestry in Canada and Sweden, and peat in regions such as Ireland. Activation routes include physical (steam or carbon dioxide) activation and chemical activation using agents historically developed by chemical firms such as Eastman Chemical Company and research at Max Planck Society. Physical activation typically involves pyrolysis in furnaces like those produced by Siemens-type manufacturers followed by gasification with steam. Chemical activation employs reagents such as phosphoric acid (H3PO4) and zinc chloride (ZnCl2), linking industrial chemistry histories to companies like Solvay and DuPont. Emerging methods integrate microwave-assisted activation researched at Harvard University and activation using templating approaches inspired by materials work at University of California, Berkeley.
Activated carbon exhibits a hierarchical pore network—micropores (<2 nm), mesopores (2–50 nm), and macropores (>50 nm)—a concept studied in porosity science at Brookhaven National Laboratory and characterized using techniques developed at National Institute of Standards and Technology. Surface area measurements often invoke the Brunauer–Emmett–Teller method refined by researchers associated with University of Cambridge and instrumentation from companies like Micromeritics. Surface chemistry includes oxygen-containing functional groups whose analysis connects to spectroscopic work at Lawrence Berkeley National Laboratory and chemical thermodynamics pioneered by scientists such as Linus Pauling and institutions like California Institute of Technology. Mechanical strength, ash content, and bulk density are tailored for sectors served by manufacturers including Cabot and Jacobi Carbons.
Adsorption on activated carbon is governed by physisorption and chemisorption processes described in texts from IUPAC and theoretical frameworks advanced at Princeton University and Stanford University. Isotherm models (Langmuir, Freundlich, Temkin) trace back to scientists like Irving Langmuir and are applied in studies published by journals affiliated with Royal Society of Chemistry and American Chemical Society. Kinetic models and breakthrough curve analysis are used in process design taught at Massachusetts Institute of Technology and implemented in water plants overseen by utilities such as Veolia and Suez. Capacity depends on pore size distribution, surface chemistry, and target molecules including VOCs regulated under statutes like the Clean Air Act and contaminants enumerated by Environmental Protection Agency guidance.
Activated carbon serves in potable water treatment operated by utilities in cities like London and New York City; in wastewater treatment plants employing technologies developed at EPA labs; in air purification for indoor environments influenced by standards from ASHRAE; in industrial solvent recovery for chemical companies such as Bayer and Shell; in food and beverage decolorization in operations by firms like Coca-Cola and Nestlé; in pharmaceutical purification in facilities of Pfizer and Roche; in gas masks and respirators with designs from military programs tied to NATO; and in clinical emergency medicine protocols endorsed by American Red Cross and hospitals like Mayo Clinic for toxin adsorption. Emerging fields include energy storage research at Oak Ridge National Laboratory and environmental remediation projects coordinated by United Nations Environment Programme.
Production facilities are regulated under environmental frameworks from agencies such as the Environmental Protection Agency and European Environment Agency addressing emissions of greenhouse gases and hazardous byproducts. Occupational exposure standards reference organizations like Occupational Safety and Health Administration and National Institute for Occupational Safety and Health; worker protection programs are implemented by unions and corporations including United Steelworkers when relevant. Lifecycle assessments conducted by research teams at World Resources Institute and International Energy Agency analyze carbon footprints associated with feedstock sourcing from regions like Indonesia and Brazil, where land-use issues intersect with policies of Convention on Biological Diversity.
Spent activated carbon management follows practices developed in municipal programs in cities such as Tokyo and Singapore including thermal reactivation at dedicated plants operated by contractors like Veolia and SUEZ. Regeneration technologies—vacuum thermal reactivation, chemical stripping, and biological treatment—are subjects of research at Argonne National Laboratory and companies like Jacobi Carbons offering services. Disposal routes include secure landfill in accordance with regulations from agencies such as the Environmental Protection Agency and regional authorities such as Environment Agency (England and Wales), or material recovery policies promoted by European Commission circular economy initiatives.
Category:Carbon materials