Activated Carbon

 – The filter media adsorbent of choice for liquid and gaseous filtration

Rema Filtration specialises in the production of activated carbon impregnated filter media for a wide range of uses for liquid filtration and gas / air filtration applications involving difficult to remove contaminants.

As an adsorbent, activated carbon is unsurpassed in its effectiveness. It can also be produced from a wide range of base materials and by several processes, from which the most appropriate solution can be selected for your particular end use.

The raw material feedstock for activated carbon is usually drawn from Coal, Coconut shell, Wood and Peat, however, far more exotic sources can also be used when specific properties are required.

The method of activation almost always uses steam, but chemicals such as phosphoric acid or (less often) zinc chloride may also be used to affect pore structure, or to assist in the retention (in the case of softer materials) of the macro structure. The effectiveness of activated carbon may be ascribed to its extended internal structure and the variety of chemical species that exist at its surface.

Extended Internal Surface (Surface Area)

For an adsorbent to function well it requires an extended surface. Silica gel, zeolites, alumina silicates, refractory oxides and clays are all adsorbents that can have surface areas of up to 100m2/g, but activated carbon can routinely have a surface area of 1500m2/g, and, in fact, values above 3000m2/g have been obtained in specialist cases and academia.

Surface Species (Active Sites)

When an adsorbent comes into contact with a surface, the act of being adsorbed requires there to be an interaction between adsorbent and adsorbate, an interaction which forms a transient adduct, persisting only as long as the conditions remain energetically favourable. Whereas a mineral may have several types of different surface environments, activated carbon can provide a multitude of sites, with varying geometric and charge constraints. Such wide ranging ‘active sites’ can potentially be attractive to a far greater number of species, and are therefore more likely to be able to effectively adsorb them.

Details of some of the standard activated carbon adsorption capacities can be found in our activated carbon adsorption guide.

For more information about the Rema Filtration range of activated carbon filter media or to discuss how effective activated carbon is likely to be for your particular application please contact us.

Now available for download – A white paper on the benefits of using activated carbon in electroplating process to control contaminants, improve quality and promote cost-effectiveness. 
Please visit the Industrial Liquid Filtration section of our website and enter brief details to access the document.