A comparison of adsorption equilibrium, kinetics and thermodynamics of aqueous phase clomazone between faujasite X and a natural zeolite from Kenya

Shikuku, Victor Odhiambo; Donato, Filipe F.; Kowenje, Chrispin O.; Zanella, Renato; Prestes, Osmar D.

doi:10.17159/0379-4350/2015/v68a33

Cited by 28 publications

(14 citation statements)

References 32 publications

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“…The movement mechanism of the adsorbate molecules from the bulk solution to the adsorbent surface is reported to occur in multiple steps, such as; external surface diffusion, pore diffusion and adsorption on the pore surface [16]. The kinetic data were fitted to intraparticle diffusion model (Eq.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Orata¹,

Lilechi²,

Kimosop³

2016

JCCE

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Abstract:In this work, the adsorptive features of water hyacinth (Eichhornia crassipes) derived biochar for sequestration of ciprofloxacin and caffeine from aqueous solution is reported. The isothermal behaviour, adsorption kinetics, mechanisms and thermodynamic parameters were investigated in batch mode. Langmuir and Freundlich models described the equilibrium adsorption data with regression values > 0.9. The kineticsdata obeyed the pseudo-second-order kinetic law while intraparticle pore diffusion was not the only rate controlling step. The computed thermodynamic parameters, namely change in Gibbs free energy (ΔG), change in enthalpy (ΔH) and change in entropy (ΔS) indicated that the adsorption processes were spontaneous and exothermic with less randomness. pH dependence studies depicted multi-mechanistic adsorption for both compounds and is hypothesized to involve hydrophobic interactions besides other non-coulombic interactions. The findings demonstrate that water hyacinth biochar presents an excellent low cost and environmentally benign adsorbent for mitigation of pharmaceuticals from water with a removal efficiency of above 60 % for caffeine and ciprofloxacin.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Orata¹,

Lilechi²,

Kimosop³

2016

JCCE

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“…In literature, the magnitude of the ΔH value is reported lie between 40 and120 kJ mol -1 for chemisorption mechanism. 8 In the present study, the ΔH values (2.728 kJ mol -1 and 29.955 kJ mol -1 for CAF and CIP, respectively) imply the adsorption mechanism of CAF and CIP onto NZ-K is predominantly physical in nature which puts to doubt the chemisorption mechanisms alluded to by the PSO model. The negative ΔH values confirm that the adsorption processes are exothermic while the negative entropy values indicate increased orderliness at the solute/adsorbent interface.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 47%

“…The chemical composition was SiO 2 62.2 %, Al 2 O 3 13.3 %, CaO 12.0 %, MgO 1.64 %, Na 2 O 3.09 %, K 2 O 0.17 %, MnO 0.2 % and Fe 2 O 3 4.83 %. 8 The pH at point of zero surface charge (pH pzc ) was obtained using the protocol reported in literature. 11…”

Section: Preparation Of Adsorbentmentioning

confidence: 99%

“…7 Zeolites are facile materials in abatement of pollutants from water due to their generally high adsorption densities, catalytic properties and their inherent potential to be regenerated with minimum loss of their original properties. 8,9 However, synthetic zeolites are costly relative to their naturally occurring counterparts. The aim of this study was to evaluate the adsorption characteristics of naturally occurring zeolitic tuff of Kenyan origin (NZ-K) for caffeine (CAF) and ciprofloxacin (CIP) ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Caffeine and Ciprofloxacin Adsorption from Water onto Clinoptilolite: Linear Isotherms, Kinetics, Thermodynamic and Mechanistic Studie

Ngeno¹,

Shikuku²,

Orata³

et al. 2019

S.Afr.j.chem.

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In this study, clinoptilolite was used to sequester ciprofloxacin (CIP) and caffeine (CAF), two emergent contaminants, from aqueous solution using batch equilibration method and the effects of contact time, pH, initial contaminant concentration, temperature and adsorbent dosage investigated and herein reported. The adsorption kinetics was described by the pseudo-second-order model (PSO) and pore diffusion was not the sole operative rate-controlling step as depicted by the intraparticle diffusion model. The equilibrium data were modelled using three linear forms of Langmuir equation and Freundlich model and was best fitted by the Lineweaver-Burk linearization of Langmuir equation (type-1). Linearization is shown to induce errors that may lead to discrepancies in parameter values estimation. The derived thermodynamic functions revealed the adsorption processes are exothermic, spontaneous and physical in nature. The adsorption mechanism of CIP is strongly controlled by electrostatic interactions while CAF adsorption is weakly affected by changes in pH. The findings demonstrate that clinoptilolite in its unmodified form is a potential low-cost and eco-friendly adsorbent for removal of pharmaceutically active ingredients from water.

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“…e Freundlich isotherm model showed an excellent fit for the adsorption data of CV. e value of Freundlich constant lies between 1 and 10, which means good adsorption of crystal violet on Khulays natural bentonite [31].…”

Section: Adsorption Isothermsmentioning

confidence: 95%

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

Al-Shahrani

2020

Journal of Chemistry

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The study investigates the phenomena involved in the crystal violet (CV) removal using the Khulays natural bentonite from the wastewater. The batch technique was utilized for performing the adsorption experiments. The operating systems were used for the investigation of the adsorption behaviour in the study, which included the initial CV concentration, time taken for shaking, the dosage of adsorbent, and the initial solution pH. The Freundlich isotherm framework and the Langmuir data were assessed in the experiment. The study outcome revealed that the equilibrium in the study was reached when shaking takes place for about 40 minutes. Additionally, the data of the sorption revealed that the enhancement of the CV concentration at the start mitigates the percentage of the CV removal as a result of which saturation integration in the Khulays bentonite dye occurs. The initial improvement in the solution pH led to improved CV adsorption. The data achieved at the isotherm adsorption were found adequate with the frameworks of Freundlich isotherm and Langmuir. Along with it, the model of pseudo-second-order kinetics was used to exhibit the adsorption of crystal violet with the Khulays natural bentonite. The Khulays natural bentonite adsorption of CV was demonstrated by the thermodynamic data exhibiting its spontaneous as well as endothermic nature. The study concludes that basic dyes can be effectively removed from the wastewater by the use of Khulays natural bentonite.

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A comparison of adsorption equilibrium, kinetics and thermodynamics of aqueous phase clomazone between faujasite X and a natural zeolite from Kenya

Cited by 28 publications

References 32 publications

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Caffeine and Ciprofloxacin Adsorption from Water onto Clinoptilolite: Linear Isotherms, Kinetics, Thermodynamic and Mechanistic Studie

Phenomena of Removal of Crystal Violet from Wastewater Using Khulays Natural Bentonite

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