Adsorption studies on removal of Anionic dyes from aqueous solution Using activated carbons prepared From a low cost material

Abstract

Due to the ever growing demand in textiles synthetic organic dyes newlineare widely used in textile fibers such as cotton silk and polyester More than newline10 000 different types of dyes and pigments with an annual production of newlinemore than 0 7 million tons are commercially available and 5 to 10 of the newlinedye stuff is lost as industrial effluents Untreated disposal of this coloured newlinewater into the natural water bodies not only cause damage to aquatic life but newlinealso to human beings by mutagenic and carcinogenic effect Thus the newlineremoval of dyes from coloured effluents particularly those from textile newlineindustries is one of the major environmental concerns nowadays To newlineminimize the impact of effluents various techniques such as electro flotation newlinemembrane filtration reverse osmosis oxidation techniques and ion exchange newlinehave been employed However, these processes are expensive and cannot be newlineused to treat a wide range of industrial effluents Among the advanced chemical or physical treatments adsorption is newlineconsidered more effective and less expensive than other techniques Activated newlinecarbon is widely used as an adsorbent because of its high adsorption capacity newlineto several organic compounds in wastewater treatments However the cost of newlineactivated carbons is relatively high thus limiting its usage As a result many newlinenovel materials have been tested as adsorbents with two objectives to replace newlineactivated carbon with inexpensive alternatives and to use various waste newlineproducts as adsorbents These include mango seed kernel peanut hull newlinehazelnut shells and jute fibre newline newline