Adsorption of Pb (II) and Cd (II) from aqueous solutions onto sodium tetraborate-modified Kaolinite clay: Equilibrium and thermodynamic studies

Unuabonah, Emmanuel I.; Adebowale, Kayode O.; Olu-Owolabi, Bamidele I.; Yang, Lizhong; Kong, Lingqian

doi:10.1016/j.hydromet.2008.02.009

Cited by 206 publications

(86 citation statements)

References 34 publications

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“….94 mg/g) with increase biomass dose. Similar reports are found in literature [7,22]. It is apparent that by increasing the amount of RBL, available sorption sites for sorbentsolute interaction is increased due to increased available surface negative charges and decrease in the electrostatic potential near the RBL surface which favors sorbent-solute interaction; hence, leading to the noticed increased percentage Pb 2+ removal from the aliquot solution.…”

Section: Effect Of Adsorbent Dosesupporting

confidence: 87%

“…The bulk density and specific gravity of the RBL sample was determined as described by Radojevic and Bashkin [21]. The pH at the point zero charge (pH PZC) was determined as described by Unuabonah et al [22]. The determination of RBL surface properties is necessary because the particle sizes are most likely heterogeneous and these properties aid in estimating the degree of metal sorption.…”

Section: Sampling Pre-treatment and Characterization Of Biosorbent Mmentioning

confidence: 99%

“…It is apparent that by increasing the amount of RBL, available sorption sites for sorbentsolute interaction is increased due to increased available surface negative charges and decrease in the electrostatic potential near the RBL surface which favors sorbent-solute interaction; hence, leading to the noticed increased percentage Pb 2+ removal from the aliquot solution. Unuabonah et al [22] have attributed the q e decrease with increasing mass to the decreasing total surface area of the adsorbent and an increase in diffusion path length due to aggregation of RBL particles, and as the weight of the RBL increased, the aggregation becomes increasingly significant. Fig.…”

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

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Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Olu-Owolabi

Diagboya

Ebaddan

2012

Chemical Engineering Journal

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tBiosorption of lead (II) ions onto raw biomass of the moss plant Barbula lambarenensis has been studied using the batch equilibrium adsorption method. Equilibrium isotherms, kinetics and thermodynamic parameters have been evaluated. The FT-IR analysis showed that likely functional groups responsible for the adsorption are carboxyl, carbonyl, amides and hydroxyl groups. The pH for optimum adsorption is 5.0. Equilibrium data fit well to the Langmuir isotherm. The estimated maximum adsorption capacity was found to be 62.50 mg/g at 298 K and 90.91 mg/g at 323 K. The kinetic data obeyed the pseudo-second-order model. The free energy changes (DG o ) are positive and the reaction is exothermic with decreased randomness at the sorbent/solution interface. Taking into account its good adsorption capacity, ease of sample treatment, as well as availability, the biomass of B. lambarenensis is a promising cost-effective biosorbent for Pb 2+ removal from aqueous environment.

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Section: Effect Of Adsorbent Dosesupporting

confidence: 87%

Section: Sampling Pre-treatment and Characterization Of Biosorbent Mmentioning

confidence: 99%

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

See 1 more Smart Citation

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Olu-Owolabi

Diagboya

Ebaddan

2012

Chemical Engineering Journal

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“…Also, the decrease of q e with increasing the sorbent mass is attributed the decrease of the adsorbent total surface area and the increase in diffusion path length due to aggregation of adsorbent particles [86] [87] [88]. Furthermore upon increasing the adsorbent dosage, the binding sites of the adsorbent are shielded from metal where elevated dosage could impose a screening effect of the dense outer layer of the cells [89] [90].…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

El-Araby¹,

Ibrahim²,

Mangood³

et al. 2017

GEP

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In this study, the adsorption behavior of copper(II) ions from aqueous solutions onto sesame husk (SH) was investigated. The effect of different parameters such as pH, contact time, adsorbent dosage, adsorbate concentration, temperature and agitation speed was studied. Thermodynamic parameters, equilibrium isotherms and kinetic data have been evaluated. The functional groups and surface morphology of SH adsorbent were characterized by FTIR and SEM. Adsorption equilibrium isotherms were expressed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption models and it was found that Langmuir adsorption model fits the experimental data better than Freundlich and D-R models. The adsorption can be best described by the pseudo second-order kinetic model.

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“…794 -0.194 L g -1 ), suggesting that the sorption capacity of Cd 2+ by kaolinite clay decreased with increasing solution ionic strength. This is likely due to a reduction in negative charges on the adsorbent surface for an increase in ionic strength, resulting in a reduction in the sorption of metal ions (Unuabonah et al 2008). In addition, 1/n values tended to increase with increasing solution ionic strength, being 1.22-, 1.38-, and 1.51-fold larger at 1.8 mM than at 0.9, 0.45, and 0.0 mM, respectively, indicating that the preferential sorption of Cd 2+ was decreased at higher ionic strengths (Shahmohammadi-Kalalagh et al 2011).…”

Section: Batch Sorption Of CD 2+ By Kaolinitementioning

confidence: 99%

Kaolinite and Cd2+ Transport and Interaction in Sand Media: Batch and Column Experiments

Wikiniyadhanee¹,

Chotpantarat²,

Ong³

2016

Terr. Atmos. Ocean. Sci.

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Batch sorption and column transport experiments were used to investigate kaolinite colloids and Cd(II) ions (Cd 2+ ) cotransport in water-saturated sand media. Batch sorption was used to evaluate Cd 2+ sorption onto kaolinite clay as a function of the initial Cd 2+ concentrations and solution ionic strengths as well as determining the equilibrium sorption isotherms. For very low ionic strength (~0 mM), the Langmuir isotherm was the more suitable isotherm for the experimental results while at higher ionic strength (> 0.45 mM) the Freundlich isotherm was the more suitable isotherm. The sorption parameters, K F , K L , n, and q m , were found to decrease with increasing ionic strength. For column transport experiments, Cd 2+ -bearing kaolinite colloids were found to be retained more in the column for an increase in the solution ionic strength. For example, the steady state breakthrough rate of Cd 2+ -bearing kaolinite colloids was 0.2 C i /C 0 for an ionic strength of 0.0 mM compared to about 0.05 C i /C 0 for ionic strengths of 0.45 and 0.9 mM. This increased Cd 2+ -bearing kaolinite colloid retention trend with increased solution ionic strength was likely due to the reduced zeta-potential and increased size of the colloid particles at higher ionic strengths. Consequently, the kaolinite-facilitated Cd 2+ concentration decreased with increasing solution ionic strength. In summary, solution ionic strength had a strong effect on the transport behavior of kaolinite-facilitated Cd 2+ and Cd 2+-bearing kaolinite colloids through the sand column.

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Adsorption of Pb (II) and Cd (II) from aqueous solutions onto sodium tetraborate-modified Kaolinite clay: Equilibrium and thermodynamic studies

Cited by 206 publications

References 34 publications

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

Kaolinite and Cd2+ Transport and Interaction in Sand Media: Batch and Column Experiments

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