Removal of Malachite Green and Crystal Violet Dyes from Aqueous Solution with Bio-Materials: A Review
Malachite Green and Crystal violet are among millions of dyes which are being used in every aspect of day to day life of a human being. Approximately 12% of synthetic dyes are lost during manufacturing and processing operations and 20% of the resultant color enters the environment through effluents from industrial wastewater. They are toxic and having extremely harmful consequences; hence many governmental and environmental agencies have put in place very strict regulation and restriction on discharge of industrial waste water/effluent containing dyes into the natural water bodies. There are various technique available for removal of dyes from waste water but adsorption is the process of choice. Activated carbon is the best known adsorbent. But its use in treating the industrial waste water especially in developing countries is restricted due to very high cost. This high cost of activated carbon has forced the researchers to find out low cost and effective adsorbent which may be used as an efficient alternative of activated carbon. In this paper an attempt has been made to compile the work of various researchers on removal of crystal violet and malachite green dyes from aqueous solution by using biomaterials and agricultural waste during the last five years.
