Activated carbon has long been used to remove toxic gases and vapors from a stream of gas or liquid. These activated carbons are also useful in cleaning breathing air or exhaust gases by removing various noxious agents, and may be used in gas mask filters, respirators, collective filters and other applications, and often involve the use of special impregnants to remove gases that would not otherwise be removed through the use of unimpregnated, activated car bons. Chromium and/or other agents impregnated on an activated carbon, function as adsorbents effective in removing a variety of toxic materials from a vapor or liquid. In many applications, it is desirable that a single impregnated adsorbent be effective against a range of toxic agents in a gas stream.

Non-impregnated activated carbons are generally effective against Type A toxic agents. Over the years, a number of carbons have been developed so as to be suitable for removing gases of Type A, B, E and K, as well as combinations thereof. Metals and metal oxides of the first-row transition metal series, such as chromium and copper, are often indicated as the impregnating agents. In preparation of the filter media, the carbon is first treated with a metal reagent, and then the freshly impregnated mixture is dried and heat treated to deposit and to decompose the metal compound to its oxide. This impregnated carbon, while useful for Types A, B and/or E, depending on the application, may not be suitable as an air purification agent for other applications and/or for filters requiring a wider range of utility. Applications requiring filters that protect against a mixture of Types B or E and K toxic agents require filter media which protect against acid gases and alkaline species such as ammonia gases. 

ACIPL has developed many active carbons with and without impregnants modification for gas phase applications as enlisted:


Active carbon contains large amount of acid soluble inorganic material depending on the precursor and its source of origin. Active carbon has very high capacity to adsorb organics, inorganics, bad taste and odour material. Adsorption capacity is enhance by modifications such as acid washing because this modification removes the acid soluble inorganic materials from the carbon and make it more porous, efficient and useful for various liquid process applications such as waste water treatment, water purification, decolourisation process in chemical and pharmaceutical industries, food and beverage industry for many purposes such as decolourization of sugar, dechlorination, decaffeination, purification of organic compounds,etc.
We manufacture acid washed active carbons as per the customer requirements for the applications mentioned above.

Some of the benefits of Acid Wash carbon include Dechlorination of water, better taste, removal of bad odors, removal of color from water, removal of organic substances, etc. Acid wash carbon has extensive internal structure, neutral surface, maximum hardness, extended operational life, high volume activity, and rapid pH stabilization.
Acid wash carbon is used in various applications such as Condensate de-oiling, semiconductor process water, and protection of reverse osmosis membranes from chlorine and organic fouling.

ACG-50 (Acid Washed)
ACG-60 (Acid Washed)

Silver Impregnated AC / Bacteriostatic

One of the main applications of granular activated carbon is the purification of water. Its function is the retention of organic contaminants and the elimination, by chemical reaction, of the free residual chlorine that remains in the water after the disinfection stage. The removal of free chlorine takes place in the first few centimeters of the carbon bed, so there is no longer any protection against bacterial growth in the rest of the bed. Sooner or later, bacteria can enter from a poorly disinfected influent, or from some point in the effluent pipe. This may happen mainly when there is no water circulation while the equipment is out of service. Bacteria reproduce, and turn the carbon bed into a source of contamination.
In order to inhibit bacterial growth, the surface of the carbon is impregnated with 0.1% metallic silver to make carbon bacteriostatic using ionic silver to enable it to bind strongly with carbon surface to make it suitable to function and purify large volumes of water.

● High efficiency
● Negligible silver leaching
● No health hazards to humans
● No loss in Bacteriostatic property up to 6000 litres water
● Available in Granular and block form


Respiratory / Military Application

Whetlerite carbons are Cu, Cr and Ag impregnated activated carbons used for respiratory protection against super toxic nerve, blister, blood and choking agents in the military. Whetlerite carbons are used in nuclear, biological and chemical (NBC) filters for collective protection, and in NBC canisters, as part of individual gas masks, for personal protection. ACIPL expertises in the impregnation of active carbon and this whetlerite carbon is one of the best example as we bulk produce this materialto meet the Defence requirement of our country.

● Low pressure drop
● Hardness enough to withstand transport hazards
● Highly efficient
● High surface area
● Low moisture content
● No ammonia smell from canisters and filters based on this grade of impregnated carbon
● Provides longer duration of protection against Organic volatiles including nerve and blister agents
● Provides longer duration of protection against inorganic volatiles including blood and choking agents
● Provides protection against gas mask breaking agents such as Cyanogen chloride



Our impregnated activated carbons assist with removal of odorous sulphur compounds in sewage pumping stations, personal protection respirators, and removal of corrosive gases from air intake systems—specifically in electronics manufacturing facilities, museums etc.



Our AMSORB-I product categories are designed for removal of ammonia and its derivatives from air and gas streams.



Mercury and its compounds are cumulative toxins that are harmful to most forms of life even when taken in very small amounts. It’s unique properties allow widespread applications across the paper and pulp industry, chemical processors, agricultural industries, specialized battery producers, and chloroalkali manufacturers. It is also found naturally in coal—which is released on burning in power plants and heat generators, in oxygenated waters—which eventually accumulates in fish, and in air and natural gas. Activated carbons are an excellent solution to control the widespread discharge of elemental mercury and its salts.

● Specially designed to treat a variety of flue gas compositions, high adsorption capacity for many pollutants with exceptional mercury removal rates and low carbon usage.
● Most commonly used adsorbents for removal of pollutants and treatment of wastewater



Nuclear technology involves several operations, the more important being the production of nuclear fuels, processing of spent fuels, and operation of nuclear reactors. All these operations require a thorough purification of the exhaust and circulating gas. Because many of these processes involve inert gases or radioactive gases, their removal can best be carried out by activated carbon adsorption.

● Performance of these carbons used in the air cleaning unit.
● Used for removing toxic materials from a fluid.
● Used in military gas masks for removing toxic gases, apparatuses for adsorping toxic gases in the general industrial fields



Sulfur dioxide is the major air pollutant obtained from the combustion of fossil fuels. Exhaust gases from several industrial and production units where coal or sulfide ores are used, contain sulfur-containing toxic gases and vapors such as sulfur dioxide, hydrogen sulfide, carbon disulfide, and several organosulfur compounds. These industrial gases need to be desulfurized effectively before mixing with the environment. While protecting the environment from pollution, commercial benefits in terms of recovery of a valuable component, sulfur, can also be derived with the use of activated carbons.
Activated carbons are promising adsorbents for SO2 and sulfur-containing toxic gas removal due to their high efficiency and regenerative capacity.



Formaldehyde and other aldehydes are the main pollutants in indoor air. Formaldehydes are mainly obtained from paint, polymerizing plates, bindings, chemical fibers and even cigarette smoke. Being toxic, a high concentration of formaldehyde can cause symptoms such as headache and nausea, and may lead to lung cancer. Activated carbon adsorbents are the most promising adsorbents when adsorption of traces of gases and vapors is concerned.
Our impregnated activated carbons offer effective chemisorption of formaldehyde from air.



Carbon monoxide (CO) is a very toxic gas with TLV of 35 ppm and it is to be removed from the air in mines, enclosed spaces, fire breaking places for the sustenance of the life. Active carbon can not hold the CO due to physisorption and therefore many impregnants were used in past to make the CO removal adsorbent. Copper and manganese based adsorbent was found to be best but its main disadvantage was that it got deactivated at high RH. In order to overcome this disadvantage palladium impregnated carbon was developed which became even more active due to high RH. This again one of the very specialized carbon developed by us for air purification and CO removal. It almost works like the turn over catalyst and offers very high protection against CO.

● High Surface area carbon
● Highly efficient for CO removal
● Almost offers endless protection against CO
● Works as turn over catalyst
● Palladium found to be of nano size in this product
● Works in any RH but becomes more active at high RH

Paladium Impregnated Carbons
Note: CO removal capacity has been specified for quality control, otherwise it offers very high protection.


In general, the adsorption capacity of activated carbon is proportional to the internal surface area, pore volume, pore size distribution and especially the surface chemistry. There are numerous reports of more organic adsorption in pores that are barely large enough to admit the adsorbate molecule; for example, it has been pointed out that dyes and humic acids have dimensions (1.5–3.0 nm) that favour their adsorption in mesopores. Hence, the difference in pore size distribution affects the adsorption capacity for molecules of different sizes and shapes. The removal efficiency can be further enhanced by the electric force between the carbon surface and the adsorbate. In some cases, adsorption depends upon dissociation of particular functional groups—which in turn depend on the activation condition, activating chemical and the conditions of application. Activated carbon therefore is required to be customized as per the specification of the user depending on the application. We carry out physical and chemical modification with and without impregnants of activated carbons to customize them and the best examples are our military grade carbon, CO adsorbent based on active carbon, heavy metal removal carbon, iron removal carbon, etc.

We work with our customers to develop custom carbons to address specific needs.

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