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Paper Details

Adsorption of Lead (II) Ions from Aqueous Solutions by Bacterial Alginate

Husam Sabah Auhim

Journal Title:Journal of Chemical, Biological and physical sciences

Bacterial strain H 8, which produces high amount of extracellular polysaccharide alginate, was isolated from soil, and identified as strain of Azotobacter chrococcum by its biochemical /physiological characteristics, alginate was extracted, partially purified and used as adsorbent. Analysis of alginate by Fourier transform infrared spectrometry (FTIR) show that the -OH groups present in bacterial alginate are clearly seen at 3433.06 cm-1, the peaks attributed to the -CH3 groups present at 2916.17 cm-1,and some distinct peaks such as carboxyl group showed strong absorption bands at 1604.66 cm-1, 1411.80 cm-1 and 1303.79 cm-1. Adsorption of lead (II) ions onto bacterial alginate was investigated with the variation in the parameters of contact time, temperature, pH and the amounts of adsorbent. Alginate has a high affinity and binding capacity for lead (II) ions, best adsorption level occurred after 30 min of treatment. Addition 50 mL of 1% alginate to 50 mL of solution containing lead (II) ions at 35C, alkaline pH (10) was more suitable for lead (II) ions adsorption than neutral or acidic pH, and the lead (II) ions in the original solution can be removed completely by bacterial alginate, the removal ratio for lead (II) ions was 100 %.