Removal of metallic trace elements (Pb2+, Cd2+, Cu2+, and Ni2+) from aqueous solution by adsorption onto cerium oxide modified activated carbon

Kouotou, Daouda; Ghalit, Mohammad; Ndi, Julius Nsami; Martínez, Luisa María Pastrana; Ouahabi, Meriam El; Ketcha, Joseph Mbadcam; Gharibi, Elkhadir

doi:10.1007/s10661-021-09267-9

Cited by 14 publications

(10 citation statements)

References 56 publications

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“…Cu 2+ has the highest charge density and the strongest electronegativity among the four ions, so it is easily attracted by lone pair electrons on the active adsorption groups to form stable complexes. In addition, the adsorption capacity of the adsorbent to metal ions is inversely proportional to the radius of hydrated metal ions, 28,29 thus Pb 2+ with the minimum hydration ion radius (4.01 pm) is the closest to the adsorption surface and is easier to be captured by the adsorption sites. Moreover, Cu 2+ and Pb 2+ are typically considered as intermediate Lewis acids, based on the principle of hard and soft acids and bases (HSAB), 30 which can coordinate with both hard and soft Lewis bases.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the adsorption capacity of the adsorbent to metal ions is inversely proportional to the radius of hydrated metal ions, 28,29 which can coordinate tightly with soft Lewis bases. 32 The amino groups on CTS, as the important adsorption sites, are generally regarded as a soft Lewis base, 33 which have a stronger adsorption capacity for Cd 2+ than Cr 3+ .…”

Section: Adsorption Performance Of Microspheresmentioning

confidence: 99%

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Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Zhong-hua

Zou

Zhao

et al. 2022

Env Prog and Sustain Energy

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Magnetic ion-imprinted microspheres (IIM) with core-shell structure were successfully prepared by reverse emulsion polymerization and applied to adsorb heavy metal ions from sewage. The semi-interpenetrating polymer network composed of cross-linked polyacrylamide (PAM) and linear chitosan (CTS) was used as the microgel shell of microspheres, which can not only fully retain the active sites of CTS but also tightly encapsulate magnetic particle nuclei. In addition, ion imprinting technology was used to further improve the adsorption capacity. In this study, the effects of PAM to CTS ratio on the thermal stability, magnetic properties, and microstructure of microspheres were investigated. Adsorption studies showed that IIM exhibited excellent selective adsorption of Cu(II), and the effects of initial concentration of metal ions, adsorption time, adsorbent dosage, pH, ionic strength, and cycle times on adsorption of Cu(II) by IIM-2 were also studied. In addition, it was revealed that pseudo-second-order kinetic model and Langmuir isotherm model could better simulate the adsorption kinetic and isotherm of IIM-2 for Cu(II), respectively. At 30 C and pH 5.0, the theoretical maximum adsorption capacities for Cu(II) by IIM-2 were 151.13 mg/g. X-ray photoelectron spectroscopy and Zeta potential study showed that the adsorption mechanism of IIM-2 was a combination of electrostatic interaction and ion exchange.

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Section: Resultsmentioning

confidence: 99%

Section: Adsorption Performance Of Microspheresmentioning

confidence: 99%

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Zhong-hua

Zou

Zhao

et al. 2022

Env Prog and Sustain Energy

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“…This phenomenon considerably limits the electrostatic interaction and ion exchange between adsorbent and adsorbate, thus stalling the cations (Pb 2+ ) adsorption. 57,58…”

Section: Point Of Zero Chargementioning

confidence: 99%

Adsorption of lead ions from wastewater using electrospun zeolite/MWCNT nanofibers: kinetics, thermodynamics and modeling study

Mahmood,

Alkorbi,

Hussain

et al. 2024

RSC Adv.

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“…Contrarily, a negative coefficient indicates that the factor has an antagonistic effect on the degradation rate. Its increase leads to a reduction in the rate of degradation and a reduction in the factor that favors it (Kouotou et al, 2021).…”

Section: Optimization Of the Removal Of Methyl Orangementioning

confidence: 99%

Synthesis and characterization of peanut shell-derived ferromagnetic activated carbon: application in the Fenton process for the degradation of methyl orange

Ndongmo,

Mabou,

Tchuifon Tchuifon

et al. 2024

Front. Environ. Chem.

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The objective of the current work was to synthesize and characterize ferromagnetic activated carbon from peanut shells (PSs) and apply it for the degradation of methyl orange (MO) following the heterogeneous Fenton process. PSs were activated with phosphoric acid and potassium hydroxide at 1:1, 1:2, and 1:3 solid/liquid activation ratios and different concentrations (0.5, 1, and 1.5 M) and pyrolized at 500°C. Based on the iodine indexes, KOH-activated carbon adsorbents exhibited higher porosity than the H3PO4-activated adsorbents. KOH-activated carbon at a 1:3 activation ratio (iodine value 591 mg/g) was selected for magnetization using iron (II) ions and catalytic mineralization of MO dye. The ferromagnetic activated carbon (AC-PS@FeII) was characterized using Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, and nitrogen-adsorption BET measurements. AC-PS@FeII contained ferromagnetite with a cubic spinel structure and a specific area of 181.96 m2·g–1. AC-PS@FeII degraded MO with a degradation efficiency of 99.22% at pH 2, 4 g/L of catalyst dosage, and a 50-min contact time. The results of recyclability tests, using distilled water, revealed a slight decrease in degradation capacity after four runs, indicating that the developed catalyst was appreciably stable. The hetero-Fenton catalyst from peanut shells could be an ideal catalyst for treating wastewater contaminated with dyes as a path toward a circular economy.

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Removal of metallic trace elements (Pb2+, Cd2+, Cu2+, and Ni2+) from aqueous solution by adsorption onto cerium oxide modified activated carbon

Cited by 14 publications

References 56 publications

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Magnetic ion‐imprinted microspheres for the removal of heavy metal ions from aqueous solution

Adsorption of lead ions from wastewater using electrospun zeolite/MWCNT nanofibers: kinetics, thermodynamics and modeling study

Synthesis and characterization of peanut shell-derived ferromagnetic activated carbon: application in the Fenton process for the degradation of methyl orange

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