Synthesis of Activated Carbons for Heavy Metals Removal

Oladipo, Babatunde; Ibrahim, Taiwo Hassan; Ajala, Sheriff Olalekan; Akintunde, Aramide M.; Taiwo, Abiola Ezekiel; Betiku, Eriola

doi:10.1007/978-3-030-47400-3_1

Cited by 2 publications

(2 citation statements)

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“…Adsorption isotherms are useful in explaining the interaction between the adsorbate and the adsorbent and in defining optimal adsorbent application. 26 The influence of temperature on the equilibrium capacity of the iron precipitate powder for Cu(II) ions uptake was determined using well-established isotherm models, viz., the Langmuir and Freundlich models. The goodness of fit of the applied models to experimental data was checked by the coefficient of determination (R 2 ).…”

Section: Study Of Adsorption Factorsmentioning

confidence: 99%

“…Adsorption kinetics describe the rate of solute uptake at the solid− liquid boundary and gives important data on the equilibrium time, which is integral for the design and operation of an adsorption process. 26 The kinetics of Cu(II) adsorption by the iron precipitate powder was investigated with the pseudo-firstorder, pseudo-second-order, and Elovich kinetic models. The pseudo-first-order model was established on the adsorbent capacity.…”

Section: Study Of Adsorption Factorsmentioning

confidence: 99%

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Kinetics, Thermodynamics, and Mechanism of Cu(II) Ion Sorption by Biogenic Iron Precipitate: Using the Lens of Wastewater Treatment to Diagnose a Typical Biohydrometallurgical Problem

2021

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The feasibility of improving typical biohydrometallurgical operation to minimize copper losses was investigated by the use of biogenic iron precipitate for the uptake of Cu(II) ions from aqueous solutions. The iron precipitate was obtained from mineral sulfide bioleaching and characterized using SEM/EDS, XRD, FTIR, BET, TGA, and pH pzc analyses. The results show that the precipitate is highly heterogeneous and that Cu(II) ion adsorption can be described by both Freundlich and Langmuir adsorption isotherms, with a maximum adsorption capacity of 7.54 mg/g at 30 °C and 150 mg/L. The sorption followed pseudosecond-order kinetics, while the major presence of −OH and −NH 2 functional groups initiated a chemisorption mechanism through an ion-exchange pathway for the process. Ionic Cu(II) (radius (0.72 Å)) attached easily to the active sites of the precipitate than hydrated Cu(II) (radius (4.19 Å)). With an estimated activation energy of 23.57 kJ/mol, the obtained thermodynamic parameters of ΔS°(0.034−0.050 kJ/mol K), ΔG°(8.37−10.64 kJ/mol), and ΔH°(20.07−23.81 kJ/mol) indicated that the adsorption process was chemically favored, nonspontaneous, and endothermic, respectively. The 43% Cu(II) removal within 60 min equilibrium contact time at pH 5 was indicative of the reduced efficiency of copper extraction observed in a real-life biohydrometallurgical process due to sorption by the iron precipitate. The result of this study might provide an insight into the management of the biohydrometallurgical process to minimize copper losses. It may also help mitigate environmental pollution caused by the disposal of these biogenic iron precipitate residues.

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Section: Study Of Adsorption Factorsmentioning

confidence: 99%

Section: Study Of Adsorption Factorsmentioning

confidence: 99%

Kinetics, Thermodynamics, and Mechanism of Cu(II) Ion Sorption by Biogenic Iron Precipitate: Using the Lens of Wastewater Treatment to Diagnose a Typical Biohydrometallurgical Problem

2021

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Dye removal using novel adsorbents synthesized from plastic waste and eggshell: mechanism, isotherms, kinetics, thermodynamics, regeneration, and water matrices

Mensah

Mahmoud

Fujii

et al. 2022

Biomass Conv. Bioref.

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High-density polyethylene (HDPE) waste and chicken eggshell were used to synthesize three novel adsorbents, namely mesoporous graphene (MG), nano-eggshell modified graphene (nEMG), and nano-magnetic eggshell modified graphene (nM-EMG) for methyl red (MR) adsorption from simulated wastewater. The effects of adsorption conditions (pH, contact time, initial dye concentration, adsorbent dose, and temperature) were investigated. MG, nEMG, and nM-EMG were characterized using SEM, TEM, BET, EDX, XRD, and FTIR analyses. MG, nEMG, and nM-EMG had specific surface areas of 15, 31, and 179 m2/g and mean pore diameters of 27, 29, and 5 nm respectively. The equilibrium adsorption capacities of MG, nEMG, and nM-EMG were 5.6, 8.1, and 6.5 mg/g respectively at MR concentration of 100 mg/L, pH 4, adsorbent dose of 1.0 g/100 mL, and temperature of 25 °C. All MR sorption processes followed the pseudo-second-order and Langmuir–Freundlich model. The adsorption rates were controlled by intra-particle and film diffusion. MR uptake on the synthesized adsorbents was spontaneous, endothermic, and chemisorption. The adsorption occurred via electrostatic interactions, π electron interactions, and hydrogen bonding. The performance of the prepared adsorbents was examined in different water matrices and compared with other MR adsorbents. After five regeneration cycles, the adsorbent reusability study showed that nM-EMG is the most stable and reusable adsorbent.

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Synthesis of Activated Carbons for Heavy Metals Removal

Cited by 2 publications

References 125 publications

Kinetics, Thermodynamics, and Mechanism of Cu(II) Ion Sorption by Biogenic Iron Precipitate: Using the Lens of Wastewater Treatment to Diagnose a Typical Biohydrometallurgical Problem

Kinetics, Thermodynamics, and Mechanism of Cu(II) Ion Sorption by Biogenic Iron Precipitate: Using the Lens of Wastewater Treatment to Diagnose a Typical Biohydrometallurgical Problem

Dye removal using novel adsorbents synthesized from plastic waste and eggshell: mechanism, isotherms, kinetics, thermodynamics, regeneration, and water matrices

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