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The biosorption characteristic of mercury ions from aqueous solution using gum karaya (Sterculia urens), a natural hydrocolloid was explored as a function of pH, biopolymer concentration, contact time and temperature. Langmuir model fitted the equilibrium biosorption data better than Freundlich, Tempkin and Dubinin–Radushkevich isotherm models. The maximum biosorption capacity for gum karaya was observed...
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