Activated Carbon, popularly known as activated charcoal, is a porous material exhibiting amphoteric characteristics and is usually used for the adsorption of organic and inorganic compounds. The attractive Van der Waals forces pull the solute from solution onto its surface and is used in water, sewer water, and leachate treatments esp. removing odour, some heavy metals, and polishing the colour. It has different applications of its remarkable advantage: reduced operation cost, high surface area, significant stability, and tunability of the surface and structure.
Adsorption is the process of removing impurities using activated carbon and can be categorised into two classes: namely physical adsorption and chemisorption. Physical adsorption is the way by which impurities are held onto the surface of carbon by weak Van der Waals forces whereas in chemisorption the forces are relatively strong and occur at active sites on the surface. Adsorption process is influenced by factors such as pore size distribution, the molecular size of impurity, particle size of Carbon, temperature of carbon treatment, and the pH of solution.
Activated Carbon manufactured from coconut shell, a bio-mass with year-round harvesting and an abundant renewable resource, is an ideal raw material for purification because of its porosity, total pore volume, density, higher mechanical strength compared to other forms of activated carbon.
Coconut Shell based activated carbon is manufactured in a slow rotating large cylindrical tube called rotary kiln. During the process of manufacture, tube is continuously fed with raw material from a hopper into the rotary kiln and steadily turning the carbonized material. As the blower forces air into kiln, the charcoal reacts with hot steam causing the internal temperature rising to the level of 900 degree Celsius. Furthermore, hot steam activates the material as it moves slowly downwards and the reaction between steam with charcoal creates more adsorptive spaces of pores in the internal surface area.
Coconut shell-based activated carbon has its advantage over its other forms being:
Eleven Carbon™ a global supplier, manufactures customized eco-friendly coconut shell activated carbon.
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