The sorption of zinc ions from an aqueous solution using rice husk, a surplus agricultural by-product has been investigated. Some\nsimple and low-cost chemical modifications has resulted as an increase in the sorption capacity of raw rice husk. In particular,\nboiled rice husk has shown to be a very promising Zn2+ adsorbent as it is able to reduce metal concentrations and respect the\nlimits of law (0.5-1 mg/L). The effect of pH has also been evaluated, and it has resulted that the adsorption of metal ions\nincreases with an increase in the initial pH. The candidate adsorbent and work conditions have been determined in order to study\nand to design a fixed bed column system for industrial wastewater.
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