Isotherm, kinetic and thermodynamic studies for adsorption of lead(ll) onto modified Aloji clay

Obayomi, Kehinde Shola; Auta, M.; Kovo, A.S.

doi:10.5004/dwt.2020.25142

Cited by 22 publications

(7 citation statements)

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“…Thermodynamic studies focus on determining the nature and behavior of the adsorption process, as well as demonstrating how a process is affected by the temperature. 68 For this purpose, thermodynamic parameters including the standard entropy (DS1), the Gibbs free energy (DG1), and the standard enthalpy (DH1) were measured using the following eqn ( 5) and ( 6)…”

Section: Effect Of Temperature and Thermodynamic Studymentioning

confidence: 99%

Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

et al. 2022

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Section: Effect Of Temperature and Thermodynamic Studymentioning

confidence: 99%

Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

et al. 2022

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“…where C o (mg/L) is the initial Pb concentration, C t (mg/L) is the Pb concentration at time t, C e (mg/L) is the equilibrium concentration, V (L) is the volume of the solution, and W (g) is the weight of merlinoite zeolite [27][28][29].…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Removal of Lead by Merlinoite Prepared from Sugarcane Bagasse Ash and Kaolin: Synthesis, Isotherm, Kinetic, and Thermodynamic Studies

et al. 2021

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This study introduces a merlinoite synthesized from sugarcane bagasse ash (SBA) and kaolin and evaluates its application as an adsorbent to remove lead from wastewater. The synthesis was performed via the hydrothermal method, and optimal conditions were determined. The adsorption of Pb by merlinoite was also optimized. Determination of the Pb2+ remaining in the aqueous solution was determined by atomic absorption spectroscopy (AAS). Adsorption isotherms were mainly studied using the Langmuir and Freundlich models. The Langmuir model showed the highest consistency for Pb adsorption on merlinoite, yielding a high correlation coefficient (R2) of 0.9997 and a maximum adsorption capacity (qmax) of 322.58 mg/g. The kinetics of the adsorption process were best described by a pseudo-second-order model. Thermodynamic studies carried out at different temperatures established that the adsorption reaction was spontaneous and endothermic. The results of this study show that merlinoite synthesized from kaolinite and SBA is an excellent candidate for utilization as a high-performance adsorbent for lead removal from wastewater.

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“…1000 mg/L stock solutions of Cd(II) and Cr(VI) ions were prepared by known weight each of Cd(NO 3 ) 2 .4H 2 0 and K 2 Cr 2 O 7 dissolution in distilled water (1000 mL) and was used further to prepare the adsorbates (Cd(II) and Cr(IV)) solution of required concentrations (50, 100 and 150 mg/L) in a separate flask. In this experimental batch adsorption study, the experimental procedure described by [21,22] was adopted. Equilibrium batch adsorption studies with various concentrations (50, 100 and 150 mg/L) of Cr(VI) and Cd(II) at different temperatures (35, 45 and 55 C) in a set of Erlenmeyer flasks of 250 mL were carried out.…”

Section: Experimental Batch Adsorption Studymentioning

confidence: 99%

“…The parameters ΔG o , ΔH o and ΔS o of the adsorption thermodynamic tested at different temperature is given by Eq. (17) [21].…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Statistical analyses on effective removal of cadmium and hexavalent chromium ions by multiwall carbon nanotubes (MWCNTs)

Obayomi

Bello

Yahya

et al. 2020

Heliyon

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In this work, multiwall carbon nanotubes (MWCNTs) developed from cobalt-ferrite catalyst on activated carbon (from castor seed), was used as an adsorbent for the removal of cadmium and hexavalent chromium ions. The effectiveness of the adsorbent for the uptake of Cd(II) and Cr(VI)ions from aqueous solution was investigated in a process batch adsorption study. The developed activated carbon and MWCNTs were characterized by Brunauer-Emmett-Teller (BET) surface area analysis, Fourier Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) for the determination of surface area, functional group, and surface morphology, respectively. The BET surface area of activated carbon and developed adsorbent from Co-Fe/AC was 230.24 and 372.42 m 2 /g, respectively. The operational parameters evaluated on the adsorption efficiency were solution pH, temperature, adsorbent dosage initial metal ions concentration, and contact time. The adsorption of Cd(II) and Cr(VI) were found to have attained equilibrium positions in 60 min for the concentration range tested, respectively. The four linearized adsorption isotherm models; Langmuir, Freundlich, Temkin and Dubinin Radushkevich (D-R) tested, when compared, revealed that Langmuir isotherm fitted well to the experimental data judging from the higher correlation coefficient values (R 2 ) and lower values of the error functions (chi-square (χ 2 ), the sum of square error (ERRSQ/SSE) and the sum of absolute error (EABS))with monolayer adsorption capacities of 404.858 and 243.902 mg/g for Cd(II) and Cr(VI) ions, respectively. Adsorption kinetic models investigated by pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion showed the conformity of pseudo-second-order model to the process adsorption as informed by the higher values R 2 and Adj, R 2 , maximum log-likelihood and smaller ERRSQ/SSE, χ 2 , Akaike information criterion (AIC), Bayesian information criterion (BIC), and Hannan-Quinn information criterion (HQIC). The intraparticle diffusion model plots indicated that intraparticle diffusion was not the only rate-limiting step. Thermodynamic adsorption parameters (ΔH o and ΔG o , ΔS o ) showed that the adsorption of Cd (II) and Cr (VI) ions was spontaneous, endothermic, and increased in randomness between the adsorbate-adsorbent. The mean adsorption energy (E), the heat of adsorption (ΔH o ), and activation energy (E a ) values, revealed the adsorption mechanism of Cd(II) and Cr(VI) onto MWCNTs as a combination of chemical and physical adsorption but dominated more by chemical adsorption. IntroductionWater is particularly important to the existence of living organisms in the world. However, human activities which include population growth, industrialization increase, and urbanization have caused rapid contamination, compromising the availability of potable water [1]. The release of harmful substances like heavy metals, due to human actions, has posed environmental problems, affecting human health [2,3]. Heavy metals like chromium and cadmium when exceed...

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Isotherm, kinetic and thermodynamic studies for adsorption of lead(ll) onto modified Aloji clay

Cited by 22 publications

References 0 publications

Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

Synthesis of a highly porous three-dimensional PVA/GO/ZIF-67 cryogel for the simultaneous treatment of water contaminated with cadmium(ii) and lead(ii) heavy metal ions

Removal of Lead by Merlinoite Prepared from Sugarcane Bagasse Ash and Kaolin: Synthesis, Isotherm, Kinetic, and Thermodynamic Studies

Statistical analyses on effective removal of cadmium and hexavalent chromium ions by multiwall carbon nanotubes (MWCNTs)

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