{"id":16800,"date":"2023-08-31T13:38:34","date_gmt":"2023-08-31T11:38:34","guid":{"rendered":"https:\/\/www.rct-online.de\/magazin\/?p=16800"},"modified":"2026-08-04T11:08:07","modified_gmt":"2026-08-04T09:08:07","slug":"activated-carbon-key-properties-and-practical-applications","status":"publish","type":"post","link":"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/","title":{"rendered":"Activated Carbon: Key Properties and Practical Applications"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#What_Is_Activated_Carbon_Made_Of_Production_and_Properties\" title=\"What Is Activated Carbon Made Of? Production and Properties\">What Is Activated Carbon Made Of? Production and Properties<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#A_Little_Physics_What_Is_Adsorption\" title=\"A Little Physics: What Is Adsorption?\">A Little Physics: What Is Adsorption?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Applications_of_Activated_Carbon\" title=\"Applications of Activated Carbon\">Applications of Activated Carbon<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Air_Purification_with_Activated_Carbon\" title=\"Air Purification with Activated Carbon\">Air Purification with Activated Carbon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Drinking-Water_Treatment\" title=\"Drinking-Water Treatment\">Drinking-Water Treatment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Industrial_Wastewater_Treatment\" title=\"Industrial Wastewater Treatment\">Industrial Wastewater Treatment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Activated_Carbon_in_the_Food_Industry\" title=\"Activated Carbon in the Food Industry\">Activated Carbon in the Food Industry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Cosmetics\" title=\"Cosmetics\">Cosmetics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Medical_Applications_of_Activated_Carbon\" title=\"Medical Applications of Activated Carbon\">Medical Applications of Activated Carbon<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Vacuum_Technology\" title=\"Vacuum Technology\">Vacuum Technology<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/activated-carbon-key-properties-and-practical-applications\/#Reprocessing_or_Incinerating_Activated_Carbon\" title=\"Reprocessing or Incinerating Activated Carbon?\">Reprocessing or Incinerating Activated Carbon?<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\"><strong>Whether it clarifies liquids, purifies air or detoxifies the body in medicine, activated carbon serves a remarkably broad range of applications. Cabin air filters in motor vehicles alone consume more than 5,000 tonnes of activated carbon worldwide each year. Drinking-water and process-water treatment forms another major field \u2013 a single waterworks can use several tonnes a day.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Activated_Carbon_Made_Of_Production_and_Properties\"><\/span>What Is Activated Carbon Made Of? Production and Properties<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">So what makes this material \u2013 almost entirely carbon \u2013 so special?<\/p>\n<div class=\"box info  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tActivated carbon is a highly porous adsorbent. Manufacturers produce it from organic material such as wood and coconut shells, and also from slaughterhouse waste and fossil raw materials such as lignite or peat.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">Production begins by decomposing the organic feedstock thermochemically in the absence of air, at up to +1000 \u00b0C (1832 \u00b0F). The resulting solid pyrolysis products consist mainly of elemental carbon and remain largely compact. Reaching the porosity an adsorbent needs takes a second step. Here, a stream of steam and air treats the products at +800 \u00b0C to +1000 \u00b0C (1472 \u00b0F to 1832 \u00b0F). With the right process control, part of the carbon converts to carbon monoxide and hydrogen \u2013 much like the water-gas process used in the chemical industry. As gas forms, the material loses carbon mass, and the internal pressures that build up widen and perforate the once-compact structure.<\/p>\n<p style=\"text-align: justify;\">A second production route reacts the organic feedstock at +600 \u00b0C to +800 \u00b0C (1112 \u00b0F to 1472 \u00b0F) with dehydrating agents such as sulphuric or phosphoric acid. Zinc chloride works equally well. Water then washes out the chemicals, and the dehydrated solid carbon residue undergoes the same activation as the pyrolysis products.<\/p>\n<p style=\"text-align: justify;\">Activated carbon in coarse granulate form contains up to ten per cent mineral admixtures \u2013 mainly silicates \u2013 depending on the feedstock quality and production method. These admixtures barely affect the material\u2019s universal adsorption ability, yet they reduce its adsorption capacity.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"A_Little_Physics_What_Is_Adsorption\"><\/span>A Little Physics: What Is Adsorption?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"box note  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tAdsorption is a process in which liquids or gases accumulate on the surface of a solid, the adsorbent. It is a surface phenomenon, driven by the physical interaction between the adsorbing substance and the free surface of the adsorbent.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">This effect is therefore also called physisorption. When the adsorbent surface is chemically reactive and forms a chemical bond with the substance, we speak of chemisorption. A similar effect occurs when a chemically reactive reagent coats the adsorbent surface. Adsorption then relies on the chemical bond at the coating, while the adsorbent merely supplies the large surface.<\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/magazin\/en\/adsorption-absorption-the-difference-rct-magazine\/\">Adsorption should not be confused with absorption<\/a>. The difference between the two lies in where the process takes place. In absorption, substances enter the free volume of a liquid or solid \u2013 the absorbent \u2013 and become enclosed within it. Dissolving a gas in a liquid illustrates this neatly. Sorption is the umbrella term for both processes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Applications_of_Activated_Carbon\"><\/span>Applications of Activated Carbon<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"box success  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tActivated carbon works as an adsorbent thanks to one decisive property: its very high porosity and the vast internal surface that comes with it. This surface can reach up to 2,000 m\u00b2\/g at a density of just 0.3 to 0.6 g\/cm\u00b3.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">This makes it very light, unlike mineral adsorbents such as zeolites with densities around 2.5 g\/cm\u00b3. Its open-pored structure resembles that of a natural sponge. The outer pores measure between 2 and 50 nm. They open the way to deeper nanopores of 0.1 to 2 nm, where most of the adsorption takes place.<\/p>\n<figure id=\"attachment_9025\" aria-describedby=\"caption-attachment-9025\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9025 size-full\" title=\"Scanning Electron Micrograph of the Granulate\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/rasterelektronenmikrosk-aufnahme-aktivkohle.jpg\" alt=\"Scanning electron microscope image of activated carbon granulate\" width=\"450\" height=\"450\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/rasterelektronenmikrosk-aufnahme-aktivkohle.jpg 450w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/rasterelektronenmikrosk-aufnahme-aktivkohle-300x300.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/rasterelektronenmikrosk-aufnahme-aktivkohle-150x150.jpg 150w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-9025\" class=\"wp-caption-text\"><center>Scanning Electron Micrograph of the Granulate<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Because the carbon adsorbs non-selectively, it works as an almost universal sorbent \u2013 even for substances that resist precise chemical characterisation. It is essential for <a href=\"https:\/\/www.rct-online.de\/en\/filtration\">filtration<\/a> and serves as a <a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\">filter granulate<\/a>. <a href=\"https:\/\/www.rct-online.de\/en\/filtration\/filter-housings-filterelements-and-filtermodules\">Filter housings and filter elements<\/a> loaded with it, such as cartridges and adsorption filters, handle a wide range of filtration tasks.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Air_Purification_with_Activated_Carbon\"><\/span>Air Purification with Activated Carbon<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In vehicle cabins, where air exchange with the outside is limited, pollutants inevitably build up. The same applies to department stores, open-plan offices and schools. Most pollutants come from paint, floor coverings or installed <a href=\"https:\/\/www.rct-online.de\/en\/tubes-hoses\/tubings-and-pipes-made-of-rigid-plastics\">plastics<\/a>. Viruses and other pathogens can also accumulate in the air we breathe. Odours add to the burden too \u2013 sweat, stale tobacco smoke and perfume. In everyday language, people then call it \u201cstale air\u201d.<\/p>\n<p style=\"text-align: justify;\">Recirculation systems continuously pass the air of a given space through large-area carbon filters, cleaning it by physisorbing the pollutants. In the home, air flows in freely. Extractor hoods fitted with carbon filter mats usually suffice to remove kitchen odours by adsorption.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Drinking-Water_Treatment\"><\/span>Drinking-Water Treatment<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In Germany, the Drinking Water Ordinance (TrinkwV) \u2013 the \u201cOrdinance on the Quality of Water for Human Consumption\u201d \u2013 governs how waterworks treat water to drinking quality. The raw water they use is usually a blend of groundwater and surface water drawn from rivers and lakes.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\/31201\/activated-carbon-granular-sorbent-material-based-on-cocnut\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9042 size-full\" title=\"Activated Carbon Granulate Sorbent, Coconut-Based\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/aktivkohle-granulat-sorbens-auf-kokosnuss-basis11.jpg\" alt=\"Activated carbon granulate sorbent, coconut-based\" width=\"300\" height=\"212\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\/30881\/high-tech-adsorber-filter-unit-for-gas-purification\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9044 size-full\" title=\"Adsorber Filter Vessel for Gas Purification\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/adsorber-filterbehaelter-zur-gasreinigung11.jpg\" alt=\"Adsorber filter vessel for gas purification\" width=\"300\" height=\"226\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Surface water in particular carries a greater or lesser load of chemicals from agriculture and industry. Household chemicals can end up in groundwater and surface water too \u2013 from carelessly disposed wastewater and from pesticides misused in allotment gardens.<\/p>\n<p style=\"text-align: justify;\">By law, waterworks must remove such substances during their multi-stage purification. The trouble is that the chemical make-up of most contaminants remains unknown. They can therefore be recorded only as sum parameters, such as AOX (adsorbable organic halogens), DOC (dissolved organic carbon) and TOC (total organic carbon). Thanks to its non-specific adsorption, the carbon readily takes up such contaminants. Activated carbon filters are therefore an integral part of every drinking-water treatment plant.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Industrial_Wastewater_Treatment\"><\/span>Industrial Wastewater Treatment<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Discharging industrial wastewater into the environment also faces strict rules. In-house pre-treatment steps are therefore essential, tailored to the contaminants, pollutants and offensive odours a given production expects. Activated carbon filters prove indispensable here too, precisely because it adsorbs with such low selectivity. Textile dye works, for example, decolourise their effluent through carbon filters before release, and hospitals pre-treat their wastewater \u2013 heavily laden with pharmaceuticals and their residues \u2013 the same way.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Activated_Carbon_in_the_Food_Industry\"><\/span>Activated Carbon in the Food Industry<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Parts of the food industry use activated carbon filters to clarify liquid products. These include mineral waters, soft drinks and fermentation products such as vinegar. Activated carbon offers a real alternative in vegan production \u2013 vegan wine, for instance \u2013 where gelatine is off-limits as a fining agent for removing cloudiness. The grade used here comes exclusively from plant material processed at high temperatures, mostly coconut shells, which guarantees its particular quality.<\/p>\n<div class=\"box info  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tIn the EU, activated carbon is approved as the food colouring E 153 and may even be used in certified organic products. It has since risen to the status of a dietary supplement, supposed to \u201cdetoxify\u201d the body.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">\u201cBlack food\u201d products increasingly line the shelves of specialist shops \u2013 baked goods, drinks and a host of \u201cblack smoothies\u201d, all containing substantial amounts of it.<\/p>\n<figure id=\"attachment_9029\" aria-describedby=\"caption-attachment-9029\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9029 size-full\" title=\"Activated Carbon Tablets\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/tabletten-mit-aktivkohle.jpg\" alt=\"Activated carbon is sold not only as granulate for filtration, but also as capsules, tablets and powders\" width=\"450\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/tabletten-mit-aktivkohle.jpg 450w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/tabletten-mit-aktivkohle-300x200.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-9029\" class=\"wp-caption-text\"><center>Available as granulate, capsules, tablets and powders.<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Consuming such products regularly remains highly controversial. As a non-selective adsorbent, it also strips vitamins and minerals from food, and thus from the body. It binds the active ingredients of medicines too, so that they can no longer take effect.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cosmetics\"><\/span>Cosmetics<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">As in food, activated carbon has found its way into cosmetics. \u201cBlack soaps\u201d and exfoliating products \u2013 the so-called \u201cblack masks\u201d \u2013 are credited with a deep-pore, antibacterial cleansing effect. Toothpastes with added activated carbon claim to bind bacteria in the mouth, and with them bad breath, but above all to whiten stained teeth.<\/p>\n<p style=\"text-align: justify;\">So how much of this holds up? The carbon in soaps and exfoliants can of course remove deposits from the skin through mild abrasion.<\/p>\n<div class=\"box error  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tBecause it is ground to a fine dust, however, the powder can clog the pores: it is insoluble in water and therefore hard to wash out. This can achieve the very opposite of what a \u201ccarbon-free\u201d product usually delivers \u2013 a deep-pore skin cleanse.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">No one disputes that the carbon in toothpaste adsorbs bacteria and binds odours. Yet it also acts as a harsh abrasive. Teeth may look brighter for a short while, but only at the cost of worn enamel. Dentists therefore advise against using such toothpastes long-term.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Medical_Applications_of_Activated_Carbon\"><\/span>Medical Applications of Activated Carbon<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Activated carbon\u2019s high, non-specific adsorption also favours medical use. Known as \u201cCarbo medicinalis\u201d, this high-purity grade is licensed as a medicine and comes exclusively from plant material. It goes into wound-dressing pads for external injuries and after surgery, where it adsorbs germs, wound odours and exudates.<\/p>\n<p style=\"text-align: justify;\">For diarrhoea, short-term self-medication with carbon tablets may be appropriate, since the carbon binds both bacteria and their already-formed toxins in the gut. Doctors also give medicinal activated carbon for mild poisoning by chemically toxic substances \u2013 but expressly not for corrosive ones.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/filtration\/filter-housings-filterelements-and-filtermodules\/30820\/filter-housing-made-of-san\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9034 size-full\" title=\"Filter Housing Made of SAN\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filtergehaeuse-aus-san.jpg\" alt=\"Filter housing made of SAN\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filtergehaeuse-aus-san.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filtergehaeuse-aus-san-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/filtration\/filter-housings-filterelements-and-filtermodules\/30829\/filter-element-with-activated-carbon-purification-of-water\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9035 size-full\" title=\"Filter Element with Activated Carbon \u2013 Water Treatment\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filterelement-mit-aktivkohle-wasseraufbereitung2.jpg\" alt=\"Filter element with activated carbon for water treatment\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filterelement-mit-aktivkohle-wasseraufbereitung2.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/filterelement-mit-aktivkohle-wasseraufbereitung2-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Taking it is harmless, though large amounts can cause constipation. The reason is the rapid, substantial loss of water in the bowel, which thickens its contents and slows peristalsis. Like \u201cblack food\u201d products, such tablets can also inactivate medicines, which are then excreted without effect, adsorbed onto the carbon.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Vacuum_Technology\"><\/span>Vacuum Technology<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">A less familiar field for activated carbon is <a href=\"https:\/\/www.rct-online.de\/en\/tubes-hoses\/application-fields-for-tubings\/vacuum-hoses\">vacuum technology<\/a>. Standard vacuum pumps, such as rotary-vane and <a href=\"https:\/\/www.rct-online.de\/en\/pumps\/diaphragm-pumps\">diaphragm pumps<\/a>, reach vacuums down to 10<sup>-3<\/sup> mmHg \u2013 roughly 0.1 Pa, or 10<sup>-6<\/sup> bar. Downstream jet pumps, such as oil or mercury-vapour pumps, push this to 10<sup>-5<\/sup> mmHg. Adsorbing residual gases onto the carbon improves the vacuum further. The effect is strongest for permanent gases such as atmospheric nitrogen and oxygen. Cooling the adsorbent with liquid nitrogen to -196 \u00b0C (-321 \u00b0F) raises its uptake still higher.<\/p>\n<p style=\"text-align: justify;\">Sorption pumps build on this principle to cut residual gas even further in an already evacuated system. The loaded carbon sits in cold traps linked to the vacuum system through valves. The operator isolates it, regenerates it by heating separately, then reconnects it for another round of adsorption. Repeating these cycles several times reaches high vacuums down to 10<sup>-8<\/sup> mmHg.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Reprocessing_or_Incinerating_Activated_Carbon\"><\/span>Reprocessing or Incinerating Activated Carbon?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Producing activated carbon is an energy-intensive process that consumes a great deal of material. Given the large quantities that air purification, drinking-water treatment and wastewater treatment demand, reprocessing spent carbon makes clear sense. Only carbon that can no longer be recycled \u2013 after many regeneration cycles, or contaminated with highly toxic substances \u2013 goes to thermal recovery in special plants with flue-gas cleaning.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/filtration\/filter-housings-filterelements-and-filtermodules\/30828\/adsorption-filter-with-granular-activated-carbon\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9048 size-full\" title=\"Adsorption Filter with Activated Carbon Granulate\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/adsorptionsfilter-mit-aktivkohlegranulat11.jpg\" alt=\"Adsorption filter with activated carbon granulate\" width=\"300\" height=\"263\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\/30875\/activated-carbon-granular-sorbent-material-mercury-purification\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9046 size-full\" title=\"Activated Carbon Granulate Sorbent \u2013 Mercury Fine Purification\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/08\/aktivkohle-granulat-sorbens-quecksilber-feinreinigung11.jpg\" alt=\"Activated carbon granulate sorbent for mercury fine purification\" width=\"300\" height=\"189\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">The standard method for reprocessing spent carbon is stepwise heating in the absence of air, at up to +900 \u00b0C (1652 \u00b0F). Volatile adsorbate fractions burn off, while the non-volatile ones pyrolyse. The pre-treated recyclate is then reactivated. Chemical recycling routes have yet to catch on, because they inevitably leave residues that would need separate disposal as chemical waste.<\/p>\n<pre><strong>Image Sources: \r\n<\/strong>Featured image | \u00a9 hjschneider \u2013 stock.adobe.com\r\nScanning electron micrograph of the granulate | \u00a9 Mydriatic, CC BY-SA 3.0 &lt;https:\/\/creativecommons.org\/licenses\/by-sa\/3.0&gt;, via Wikimedia Commons\r\nActivated carbon tablets | \u00a9 vegefox.com \u2013 stock.adobe.com<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Whether it clarifies liquids, purifies air or detoxifies the body in medicine, activated carbon serves a remarkably broad range of applications. Cabin air filters in motor vehicles alone consume more than 5,000 tonnes of activated carbon worldwide each year. Drinking-water and process-water treatment forms another major field \u2013 a single waterworks can use several tonnes &hellip;<\/p>\n","protected":false},"author":7,"featured_media":13163,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2748],"tags":[4370,3537,3538,4366,4369,4364,4363,4365,4367,4368],"class_list":["post-16800","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-all-articles","category-materials-in-chemistry","tag-absorption-en","tag-activated-carbon","tag-activated-carbon-granulate","tag-activated-carbon-in-the-food-industry","tag-adsorption-en","tag-air-purification-with-activated-carbon","tag-drinking-water-treatment","tag-industrial-wastewater-treatment","tag-medical-applications-of-activated-carbon","tag-silicates"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Activated Carbon: Properties and Applications - 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