Comparison of Heavy Metals Removal from Aqueous Solution by Moringa oleifera Leaves and Seeds

Abstract

In this work, biomass obtained from seeds (S-MO) and leaves (L-MO) of the Moringa oleifera plant were used as low-cost biosorbents to remove the Pb(II), Cd(II), Co(II), and Ni(II) from aqueous solutions. The biosorption of the heavy metal ions was done using the batch technique. The effects of contact time (30–1440 min), biosorbent dosage (10–50 g/L) (0.1–0.5 g), and initial concentration of metals (10–500 mg/L) on the sorption capacity of metal ions were investigated. The S-MO and L-MO samples’ characterization was performed using pHpzc, X-ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR). It was found that the pHpzc was notably different between the seeds and leave-derived biosorbents. The removal process’s experimental kinetic data for both S-MO and L-MO were best described by the pseudo-second-order model for all metal ions, with R2 above 0.997 in all cases. Langmuir and Freundlich’s models were also used to analyze the isotherms parameters. Based on the Langmuir model, the maximum sorption capacities (Qm) for L-MO were found as follows: L-MO-Pb > L-MO-Cd > L-MO-Co ≥ L-MO-Ni, and for S-MO, the values of Qm values presented the following order: S-MO-Pb > S-MO-Co > S-MO-Cd > S-MO-Ni.

Comparative removal of hazardous cationic dyes by MOF-5 and modified graphene oxide

“…Dye adsorption by MOF-5 happened slowly and removal efficiencies decreased from ~ 72% to ~ 26% by decreasing mass from 1 to 0.1 g/L. Increased adsorption by dose was reported for heavy metals removal by low-cost biosorbents 62 .…”

Central Composite Design for Adsorption of Pb(II) and Zn(II) Metals on PKM-2 Moringa oleifera Leaves

“…The absorbance peak at 2871 cm −1 indicates C−H bonds that characterize the lignocellulosic materials and protein present in the biomass. 47 The absorbance peak at 1701 cm −1 was identified as the carboxyl group, and the bands that appeared around 1697−1030 cm −1 were assigned to the N−H stretching band of amino groups, and carboxylic acid characterized proteins present in the Moringa samples. Peaks observed at 1246 cm −1 indicate C−N stretching of amino groups.…”

“…The bands observed around 3085–2980 cm –1 indicate hydroxyl groups and −NH groups, which signify protein and fatty acids in the biosorbent. The absorbance peak at 2871 cm –1 indicates C–H bonds that characterize the lignocellulosic materials and protein present in the biomass . The absorbance peak at 1701 cm –1 was identified as the carboxyl group, and the bands that appeared around 1697–1030 cm –1 were assigned to the N–H stretching band of amino groups, and carboxylic acid characterized proteins present in the Moringa samples.…”

Mn(II) Sorption on Stream Sediments Sampled in Manganese Mining Area: Dynamics and Mechanisms

“…In addition, the sorption of heavy metal Mn(II) showed a similar trend for each soil sample. During the transient sorption stage (0-60 min), the adsorbent provided more adsorbable sites, and the sorption reaction could occur freely [33]. The contribution of this stage to the sorption of heavy metals Mn(II) was more significant, and more than 90% of manganese was adsorbed.…”