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Utilization of charred sawdust as an adsorbent of dyes, toxic salts and oil from water

Acid-hydrolyzed charred sawdust has been found to be an effective adsorbent of dyes, toxic salts and oil from water. The adsorbency of dyes onto sawdust and also onto charred waste from oxalic acid plant has been compared. The change in free energy (ΔG) due to adsorption of dye from the bulk to the interface of sawdust has been calculated. ΔG has been found to vary linearly with the ratio of Γ p where Γ p m represents the fraction of the surface covered by the adsorbate. The binding of salts with sawdust has been measured using the isopiestic vapour pressure technique. Hydrogen peroxide and sawdust have been found to be effective for removing oil from water. A comparison has been made between the two coagulants.