Alginate and alginate silver nanoparticles as bioadsorbent agents to remove Fe (II) ions from aqueous solution

Sodium alginate and alginate silver nanoparticles were utilized as adsorbents to eliminate Fe (II) ions from aqueous solutions. Biosorption capacity was established through the use of serial bioadsorption experiments. The effect of different investigated factors in bioadsorption included contact time, pH, adsorbent dosage, and various metal ion concentrations. Alginate silver nanoparticles were more effective than sodium alginate in removing Fe (II) from an aqueous solution. The removal efficiency of Fe (II) by nanoparticles was 80%, while by alginate was 54%. The optimal conditions for bioadsorption of Fe (II) were pH 4, contact time 150, and an adsorbent dose 0.01 g. Adsorption isotherm was fitted to Langmuir isotherm (R2 = 0.995) rather than Freundlich isotherm. Also, UV and FT-IR before and after Fe (II) adsorption were performed to confirm the bioadsorption process.