摘要
<i><span style="font-family:;" "=""><i></i></span><i><span style="font-family:;" "="">Moringa oleifera</span></i><i><span style="font-family:;" "=""></span></i></i><span style="font-family:;" "=""> is an edible plant cultivated throughout the tropical belt. It belongs to the family Moringaceae and is one of its 14 known species. This paper presents a synthesis of the main factors responsible for the retention of trace metal elements (TMEs) by </span><span style="font-family:;" "=""><i></i></span><i><i><span style="font-family:;" "="">Moringa oleifera</span></i><i><span style="font-family:;" "=""></span></i></i><span style="font-family:;" "=""> seed powder, a natural adsorbent. The five main factors studied are metal concentration, solution pH, adsorbent particle size, adsorbent dose and adsorbent/adsorbate contact time. Through these factors, we present the optimal conditions for removal of these TMEs, as well as adsorption isotherm models appropriate for the conditions of retention of these metal cations by the adsorbent. The times of 20 min (GD) and 50 min (GND) are the equilibrium times obtained in our study. An optimal adsorbent mass (GD and GND powders) of 4.5 g was found. 20</span><span style="font-family:;" "="">%</span><span style="font-family:;" "=""> to 97% abatement is observed for average pH values between 6 and 8. The coefficients of determination (R2) obtained (0.972</span><span style="font-family:;" "="">,</span><span style="font-family:;" "=""> 0.963</span><span style="font-family:;" "="">,</span><span style="font-family:;" "=""> 0.991 and 0.799) during the isotherm experiments carried out at 20</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C, 30</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C, 40</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C and 50</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C are close to 1. Also, the separation factor (R<sub>L</sub>), an essential characteristic of the Langmuir isotherm whose values are between 0 and 1, attest to the applicability of the Langmuir isotherm model to fit the experimental data of copper adsorption by Moringa powders.</span><span style="font-family:;" "=""> In this paper, we are particularly interested in the following TMEs (Mn, Ni, Cr, Cu, Cd, Co, Pb, Fe, Zn, Ag).</span>
<i><span style="font-family:;" "=""><i></i></span><i><span style="font-family:;" "="">Moringa oleifera</span></i><i><span style="font-family:;" "=""></span></i></i><span style="font-family:;" "=""> is an edible plant cultivated throughout the tropical belt. It belongs to the family Moringaceae and is one of its 14 known species. This paper presents a synthesis of the main factors responsible for the retention of trace metal elements (TMEs) by </span><span style="font-family:;" "=""><i></i></span><i><i><span style="font-family:;" "="">Moringa oleifera</span></i><i><span style="font-family:;" "=""></span></i></i><span style="font-family:;" "=""> seed powder, a natural adsorbent. The five main factors studied are metal concentration, solution pH, adsorbent particle size, adsorbent dose and adsorbent/adsorbate contact time. Through these factors, we present the optimal conditions for removal of these TMEs, as well as adsorption isotherm models appropriate for the conditions of retention of these metal cations by the adsorbent. The times of 20 min (GD) and 50 min (GND) are the equilibrium times obtained in our study. An optimal adsorbent mass (GD and GND powders) of 4.5 g was found. 20</span><span style="font-family:;" "="">%</span><span style="font-family:;" "=""> to 97% abatement is observed for average pH values between 6 and 8. The coefficients of determination (R2) obtained (0.972</span><span style="font-family:;" "="">,</span><span style="font-family:;" "=""> 0.963</span><span style="font-family:;" "="">,</span><span style="font-family:;" "=""> 0.991 and 0.799) during the isotherm experiments carried out at 20</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C, 30</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C, 40</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C and 50</span><span style="font-family:;" "="">°</span><span style="font-family:;" "="">C are close to 1. Also, the separation factor (R<sub>L</sub>), an essential characteristic of the Langmuir isotherm whose values are between 0 and 1, attest to the applicability of the Langmuir isotherm model to fit the experimental data of copper adsorption by Moringa powders.</span><span style="font-family:;" "=""> In this paper, we are particularly interested in the following TMEs (Mn, Ni, Cr, Cu, Cd, Co, Pb, Fe, Zn, Ag).</span>
作者
Mariette Désirée Yehe
Edwige Odoh
Patrick Grah Atheba
Joel Cyriaque Dadje
Gildas Komenan Gbassi
Mariette Désirée Yehe;Edwige Odoh;Patrick Grah Atheba;Joel Cyriaque Dadje;Gildas Komenan Gbassi(Département des Sciences Analytiques et Santé Publique, UFR Sciences Pharmaceutiques et Biologiques, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire;Laboratoire National de la Santé Publique (LNSP), Service Contrôle des Aliments, Abidjan, Côte d’Ivoire;Département des Sciences du Médicament, UFR Sciences Pharmaceutiques et Biologiques, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire;Laboratoire de Constitution et Réaction de la Matière, UFR Sciences des Structures de la Matière et Technologie, Université Félix Houphouët Boigny, Abidjan, Côte d’Ivoire)