Moringa oleifera Lam. seeds as a natural solid adsorbent for removal of AgI in aqueous solutions

Abstract

This work describes the sorption potential of Moringa oleifera seeds for the decontamination of Ag I in aqueous solutions. Infrared spectroscopy was used for elucidating possible functional groups responsible for uptaking Ag I . Sorption studies using Ag I standard solutions were carried out in batch experiments as functions of adsorbent mass, extraction time, particle size and pH. The Ag I was quantified before and after the removal experiments using flame atomic absorption spectrometry. Furthermore, based on adsorption studies and adsorption isotherms applied to the Langmuir model, it was possible to verify that M. oleifera seeds present a high adsorption capacity. The optimum conditions were: 2.0 g of adsorbent with particle size of 75-500 μm, 100 mL of 25.0 mg L -1 Ag I , extraction time of 20 min and pH at 6.5. The results show that Moringa oleifera seeds can be used for removing Ag I in aqueous solutions.

The Effectiveness of Moringa oleifera Seed Flour and Chitosan as Coagulant‐Flocculants for Water Treatment

“…Characterization by scanning electron microscopy showed that MOSF has fibrous aspect, as well as a porous, irregular and heterogeneous structure . MOSF comprises proteins, fatty acids, carbohydrates and lignin units having diverse functional groups . In previous contributions, it has been discussed that the active compounds of MO are cationic proteins with an isoelectric pH value of 10 .…”

Assessment of the Use of Moringa oleifera Seeds for Removal of Manganese Ions from Aqueous Systems

“…These seeds have been used for the treatment of turbid water due to their flocculation properties (Gassenschmidt et al 1995). Our research group has previously performed studies involving the treatment of aqueous solutions containing silver (Araújo et al 2010) and nickel (Marques et al 2012) ions using M. oleifera seeds, and in both cases, the percentage removals achieved were around 90%. However, there are no reports available on the use of Moringa seeds for the adsorption of manganese ions.…”

Improvement of the flocculation process in water treatment by using moringa oleifera seeds extract

“…Although there are many previous papers investigating its utilization as a natural adsorbent for special pollutant removal (Kumari et al, 2006;Araújo et al 2010), the seeds of this tropical tree have a high amount of proteins that act like cationic polyelectrolytes once they are added to raw water (Ghebremichael et al, 2005). Due to this fact, characterizing the flocculant process in drinking water is a very important task.…”