Adsorption of Mn(II) and Co(II) ions from aqueous solution using Maize cob activated carbon: Kinetics and Thermodynamics Studies

Adebayo, G. B.; Adegoke, Haleemat Iyabode; Jamiu, W.; Balogun, BB; Jimoh, AA

doi:10.4314/jasem.v19i4.22

Cited by 9 publications

(10 citation statements)

References 24 publications

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“…It has been reported that adsorbents with high iodine number/surface area perform better in the removal of small-sized contaminants. 22 The point of zero charge (pH ZPC ) of AMP was obtained at 7.2. This implies that the prepared carbon is free from surface charges near neutral pH.…”

Section: Resultsmentioning

confidence: 99%

Kinetics, Thermodynamics and Isothermal Modelling of Liquid Phase Adsorption of Methylene Blue onto Moringa Pod Husk Activated Carbon

Adebayo¹,

Jamiu²,

Okoro³

et al. 2019

S.Afr.j.chem.

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This study focused on the liquid phase sorption of methylene blue (MB) using low cost agro-waste from moringa pod husks. Moringa pod husk was carbonized at 450°C for 30 min, which was later activated with 0.1 M phosphoric acid. The physico-chemical properties of moringa pod activated carbon (AMP) were determined. The results of the physicochemical parameters are: moisture content (13.6 ± 0.02), ash content (2.61 ± 0.11), point of zero charge (pH ZPC) (7.2) and bulk density (0.6 g L-1). The sample was also characterized using Brunaeur Emmett Teller (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared spectroscopy (FTIR). The BET surface area obtained for AMP is 1340.234 m 2 g-1. The effect of optimized parameters such as initial concentration, contact time, pH, adsorbent dosage, and temperature on methylene blue removal was investigated. The obtained maximum monolayer adsorption capacity value (q max) is 9.5785 mg g-1. The three adsorption isotherm models, namely Langmuir, Freundlich and Temkin, were employed to describe the fitness of equilibrium data. The Langmuir equation fitted the adsorbent system better with a R 2 value of 0.9958. The pseudosecond-order kinetic equation also fitted the data well. Thermodynamic studies showed that the AMP-MB adsorption system is spontaneous and endothermic as a negative and positive value was obtained for G 0 (-0.460 KJ mol-1) and H 0 (4.482 KJ mol-1), respectively.

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Section: Resultsmentioning

confidence: 99%

Kinetics, Thermodynamics and Isothermal Modelling of Liquid Phase Adsorption of Methylene Blue onto Moringa Pod Husk Activated Carbon

Adebayo¹,

Jamiu²,

Okoro³

et al. 2019

S.Afr.j.chem.

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“…Carbonization Process: A known amount of coconut coirpith was carbonized in a muffle furnace for 1 hour at 500 o C, to convert the raw material to carbon, burn off volatile organic matter and also to increase its surface area, after which it was allowed to cool, then, weighed (Adebayo et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…It was later cooled in a water bath then filtered. It was then washed to neutrality with deionized water (to remove the residual acid) and dried at 105 o C in an oven (Adebayo et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

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Thermodynamic studies on adsorption of lead (II) Ion from aqueous solution using magnetite, activated carbon and composites

Adegoke¹,

Adekola²,

Olowookere³

et al. 2017

Journal of Applied Sciences and Environmental Management

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Magnetite nanoparticles, activated carbon and their composite were synthesized in the laboratory and their adsorption capacities were tested for the removal of Pb (II) ion from aqueous solutions. Magnetite was prepared using co-precipitation method and the activated carbon prepared by chemical activation. The prepared adsorbents were characterized by some physico-chemical and spectroscopic methods. The instrumental techniques used for characterizing the adsorbents include Fourier Transform Infrared (FTIR), X -ray Fluorescence (XRF) and Scanning Electron Microscopy coupled with energy dispersive X-ray (SEM-EDX). The comparative adsorption of Pb (II) ion from aqueous solution onto different adsorbents was investigated using batch adsorption experiment at room temperature. The effects of initial metal ion concentration, contact time, adsorbent dosage, and temperature were evaluated. The activated carbon shows a structure like a honeycomb with a pattern of hollows and ridges, while the EDX shows an abundance of carbon. The results showed that maximum removal of Pb (II) ions was achieved with magnetite nanoparticles at a concentration of 100 mg/L within 60 minutes. The adsorption of Pb (II) on the all adsorbents best fitted the Langmuir adsorption isotherm based on its better regression coefficient. Kinetics result showed that the adsorption followed pseudo-second order perfectly implying chemisorption. Thermodynamic result revealed ∆G values of (-6.73 to -0.502 kJ/mol), depicting that the adsorption is feasible and spontaneous. Also, the reaction is endothermic as evident in the positive value of ∆H (0.779 to 22.815 kJ/mol) and positive value of ∆S means there is an irregular increase in the randomness at the solid-solution interface of the adsorbents. The results obtained revealed that the adsorbents prepared can be used for the treatment of Pb (II)-based effluents. © JASEM https://dx.doi.org/10.4314/jasem.v21i3.5

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“…The Freundlich the exponent (n), known as heterogeneity factor, is in range of 1.566-2.754, which falls within the ranges of 1 to 10 and this indicates favourability of the adsorption as well as advantageous adsorption [70]. Value of 'n' tending towards 10 displays a higher degree of homogeneity of the particle surface [71].…”

Section: Against Timementioning

confidence: 99%

Biosorption of Bromophenol Blue from Aqueous Solution Using Flamboyant (Delonix regia) Pod

Dada

Ojo

Alade

et al. 2020

CSIJ

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Matured flamboyant pods (FBP) activated with ZnCl2 were used for batch adsorption of Bromophenol blue (BPB) dye under the effects of concentration (10-200 ppm), contact time (20-300 min), biosorbent dosage (20-120 mg) and particle size (300-850 µm). The data obtained were fitted to Langmuir and Freundlich isotherm models as well as pseudo-first-order (PFO), pseudo-second-order (PSO) and Elovich kinetic models. The highest adsorption capacity and removal efficiency of 7.5762 mg/g and 75.76%, respectively, were obtained under the effects of initial dye concentrations. The correlation coefficient (R2) for the Langmuir and Freundlich isotherms are in the range 0.9938-0.9979 and 0.9895-0.9953, respectively, while, R2, in the ranges 0.5931-0.815, 0.9962-1.000 and 0.8046-0.8828, were obtained for the PFO, PSO, and Elovich kinetic models, respectively. The order of fit of the kinetic models is PSO > Elovich > PFO. The study suggests flamboyant pod as promising biomass for the remediation of dye-bearing industrial effluents.

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Adsorption of Mn(II) and Co(II) ions from aqueous solution using Maize cob activated carbon: Kinetics and Thermodynamics Studies

Cited by 9 publications

References 24 publications

Kinetics, Thermodynamics and Isothermal Modelling of Liquid Phase Adsorption of Methylene Blue onto Moringa Pod Husk Activated Carbon

Kinetics, Thermodynamics and Isothermal Modelling of Liquid Phase Adsorption of Methylene Blue onto Moringa Pod Husk Activated Carbon

Thermodynamic studies on adsorption of lead (II) Ion from aqueous solution using magnetite, activated carbon and composites

Biosorption of Bromophenol Blue from Aqueous Solution Using Flamboyant (Delonix regia) Pod

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