THE ADSORPTION KINETICS AND MODELING FOR Pb(II) REMOVAL FROM SYNTHETIC AND REAL WASTEWATER BY MORINGA OLEIFERA SEEDS

Abstract

This work demonstrates the potential of Moringa oleifera seeds powder as an adsorbent for the removal of heavy metals from wastewater. The moringa oleifera seeds powder is characterized as an adsorbent for the removal of heavy metals from wastewater using FTIR, XRD, pH pzc , SEM and BET techniques. Several processing parameters such as; contact time, adsorbent dose, initial lead ion concentrations, pH, and temperature are optimized. The equilibrium data for bio-sorption are analyzed by using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models to define the best correlation for lead ions. Among the four isotherm models, both Temkin and Freundlich models best describe the experimental data for Pb(II).The adsorption of the metal ions, Pb (II) is well defined by the pseudo-second order model (R 2 > 0.99). The interaction of the cationic species with the MOS powder is predominately via chemisorption rather than physisorption. The thermodynamic parameters such as ΔS, ΔH and ΔG are also determined.

A critical review with emphasis on recent pieces of evidence of Moringa oleifera biosorption in water and wastewater treatment

“…), which is one of the possible paths of pollutants adsorbed by MO and MO-based biomaterials. View that the complexity of the mechanisms, which remains difficult to understand because it is mixed, and we find several types of adsorption and reaction at the same time (Swelam et al 2018 ; Tang et al 2018 ).…”

“…The authors indicated that the major process is ion exchange, and the electrostatic attraction and ionic diffusion play an important role in the adsorption process. Swelam et al ( 2018 ) MOB 34.6 Langmuir Coordination of the Pb 2+ ions with hydroxyl, carboxyl, and carbonyl groups present on the surface of MOB. Reddy et al ( 2010b ) MOB 30.4 Langmuir The kinetic studies revealed that the biosorption process followed the pseudo-second-order kinetic model.…”