SMA-O-035 A study of the removal of Manganese (II) from aqueous systems using the Moringa oleifera pods as bioadsorbent

Abstract

Nowadays, heavy metals pollution in water has become one of the most important environmental problems. Recently, bioadsorption has been proposed as an alternative treatment procedure. Moreover, enhancement of agro-industrial waste as raw material for the production of new material is the great interest. In this sense, the aim of this study is to perform a chemical characterization of moringa oleifera pods and subsequent study as bioadsorbent for removal of manganese (II) from aqueous solutions. The pods used were collected from Venezuela. After dried and pulverized, were characterized by several techniques including: scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and point of zero charge (pHPZC). The material was treated with distilled water (A) and 0.1 mol L-1 NaOH (B).The results showed that this wastes containing functional groups and adequate morphological profile for the retention of metal ions. Present a point of zero charge of 6. Effect of contact time for manganese (II) removal was tested (5 to 90 min), biomass dosage (0.25 g), metal concentration (4.0 mg/L), volume of the test solution (25 ml) and pH of 7. The residual metal concentration in the solution was measured by atomic absorption spectrophotometry (AAS).The optimal manganese (II) removal can be achieved at 5 min (79%, 97% and 98% respectively)). Infrared spectrum and morphological changes observed by SEM indicate the existence of bioadsorption phenomenon. Finally, according to achieved results, moringa pods have promising characteristics for applications in manganese (II) remediation from contaminated waters at low cost, easy acquisition, efficient and eco- friendly.