Abstract: A new Guar gum based resin containing 2, 4-dihydroxybenzoic acid group has been synthesized and their Adsorption behavior for toxic metal ions has been investigated by batch and column experiments. 2, 4-dihydroxybenzoic acid group has been incorporated on to guar gum by modified poraths method of functionalisation of polysaccharides. The Guar gum 2, 4-dihydroxybenzoic acid [GDHBA] resin can selectively separate of trace toxic metal ions which are contained in Industrial waste water. The GDHBA resin was characterized on the basis of ion exchange capacity, elemental analysis, pH titration, FT-IR spectra and thermal analysis (TGA). The chemically modified GDHBA ion exchanger resin has been used for removal and preconcentration of Zn (II), Cd (II), Fe (II), Pb (II), and Cu (II) ions in aqueous solutions and effluent of Laxmi Steel Industry, Jodhpur. The selectivity of this material varied depending upon its composition and the composition of the eluting solvent.   The large differences in K_d values of heavy metal ions at different pH, the removal and recovery of metal ions from their aqueous solutions and effluent of Laxmi Steel Industry, Jodhpur has been systematically studied.

KEYWORDS: Distribution coefficients; Ion exchange capacity; GDHBA resin; ion exchanger; Heavy metal ions.