Activated carbon is predominantly an amorphous solid with a large internal surface area and pore volume. It consists of a basic structural unit building up of condensed aromatic basal plan. Annually huge amount of biomass produce in agro industry. These biomasses can change to the better product by means of best method. One of these methods is producing activated carbon. In addition to high cost of activated carbon, many researchers have studied the feasibility of less expensive activated carbon by using cheaper raw materials. Phenols and its derivatives constitute a widespread of water pollutant. These compounds usually find in the waste waters of industrial like as petroleum industry, coke production and agro industrial process. There are lots of methods for removing phenol from waste water such as chemical oxidation, sedimentation, filtration, adsorption, osmosis and ion exchange, but adsorption with activated carbon is an effective method used extensively for the removal of phenolic compound from aqueous solutions. Adsorption of phenol in activated carbons has been intensively investigated, but relatively less work is reported related to modified carbons. The main goal of this literature is to provide the effect of CO2 modification of activated carbon prepared from walnut shell for improvement of phenol adsorbent.
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