Bioremediation of Cd(II), Pb(II) and Cu(II) from industrial effluents by Moringa stenopetala seed husk

Adsorptive removal of lead and cadmium ions from aqueous solutions by aluminium oxide modified onion skin wastes: Adsorbent characterization, equilibrium modelling and kinetic studies

“…Thus, the R 2 values for Pb 2þ (0.9881) and Cd 2þ (0.9970) suggest that the adsorption data fit well with the Freundlich model. A similar result has been reported for Pb 2þ and Cd 2þ adsorption by NALCO plant sand42 and Moringa stenopetata bark 18.…”

“…A similar result has been reported for Pb 2þ and Cd 2þ adsorption by NALCO plant sand 42 and Moringa stenopetata bark. 18 The values of separation factor and Freundlich exponent for each metal ion, as can be seen in Table 2, suggest favourability and capacity of the adsorbate-adsorbent system. 43 By comparing the adequacy of the two isotherm models, it can be concluded that the Freundlich isotherm is suitable to describe the adsorption of Pb 2þ and Cd 2þ onto chemically modified onion skin waste.…”

“…1,5 However, these adsorbents are expensive and challenging to be regenerated and reused, thereby motivating the search for cheap, efficient, reusable and biodegradable adsorbents to remove heavy metals from aqueous solutions. Such alternatives include natural and modified clays, 11,12 soil, 13 spent brewery grain, 14 agricultural by-products, 15,16 chitosan, 17 leaves, 18 cellulose 19 and industrial wastes. 1,20 Over the years, the management of onion skin waste generated in most local markets in Nigeria has been challenging.…”

Effect of the adsorbent dose and initial contaminant concentration on the removal of Pb(II) in a solution using Opuntia ficus Indica shell

“…Assuming the process occurs with a uniform distribution in the form of a monolayer on the exposed surface of the adsorbent as shown in Figure 4b, caused by the diffusive phenomena which control initial stages of Pb (II) removal (Asuquo, Martin, Nzerem, Siperstein, & Fan, 2017). On the other hand, according to the satisfactory fit of Freundlich's model and the value of n>1 is confirmed the heterogeneity of tuna shell, according to Figure 1, and the high value of K f implies a high rate of metal adsorption in the contact area of the adsorbent (El-Moselhy, Abdel Azzem, Amer, & Al-Prol, 2017; Kebede, Dube, Mhuka, & Nindi, 2019).…”

Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

“…However, unlike our study, these authors obtained a high percentage of copper removal (89.85%) for a small quantity of adsorbent (1 g) consisting of Moringa oleifera seed pods. This would be due to the difference in the adsorbents used [28]. Indeed, Moringa oleifera seed pods would have a greater availability of active sites compared to GD and GND powders.…”