Removal of lead (II)‎ from aqueous solutions by biosorption on brown seaweed, Sargassum Baccularia

الملخص EN

The purpose of this work is to investigate the batch removal of Pb2+ from aqueous solutions using marine dried brown seaweed S.

baccularia.

Seaweed was used as a low-cost adsorbent.

The effects of pH, contact time, temperature, shaking speed and the concentration of the Pb2+ solution were examined in the biosorption process with S.

baccularia.

The results showed that when S.

baccularia was used as the bioadsorbent, the optimum pH, Pb2+ concentration, equilibrium time, temperature, and shaking speed were 3, 20 ppm, 120 min, 30°C, and 120rpm.

The equilibrium adsorption data are fitted to the Langmuir isotherm model.

The separation factor (RL) in the experiment was less than one (<1), indicating that the adsorption of metal ions on Sargassum baccularia adsorbent is favorable.

The calculated activation energy (Ea) implies that the adsorption of Pb (II) on brown seaweed is a physical adsorption.

Thermodynamic results show that adsorption occurs spontaneously in nature.