Adsorption of Cadmium and Zinc Ions from Aqueous Solution Using Low Cost Adsorbents

Kumar, P. Rathish; Swathanthr, P. Akila; Rao, V. V. Basava; Rao, Sainan

doi:10.3923/jas.2014.1372.1378

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…In the subtype-2, a plateau can be identified, representing the completion of the first monolayer. This subtype was characteristic both in the acidic and alkaline samples and generally enabled the correct estimation of the adsorbate's maximum adsorption on the adsorbent [25]. In the subtypemx, the sorption curve has a maximum, which suggests desorption from the surface, and this is also often related to the adsorbent concentration effect.…”

Section: The Shape Of the Sorption Curvesmentioning

confidence: 88%

Searching for optimum adsorption curve for metal sorption on soils: comparison of various isotherm models fitted by different error functions

Sipos

2021

SN Appl. Sci.

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Studies comparing numerous sorption curve models and different error functions are lacking completely for soil-metal adsorption systems. We aimed to fill this gap by studying several isotherm models and error functions on soil-metal systems with different sorption curve types. The combination of fifteen sorption curve models and seven error functions were studied for Cd, Cu, Pb, and Zn in competitive systems in four soils with different geochemical properties. Statistical calculations were carried out to compare the results of the minimizing procedures and the fit of the sorption curve models. Although different sorption models and error functions may provide some variation in fitting the models to the experimental data, these differences are mostly not significant statistically. Several sorption models showed very good performances (Brouers-Sotolongo, Sips, Hill, Langmuir-Freundlich) for varying sorption curve types in the studied soil-metal systems, and further models can be suggested for certain sorption curve types. The ERRSQ error function exhibited the lowest error distribution between the experimental data and predicted sorption curves for almost each studied cases. Consequently, their combined use could be suggested for the study of metal sorption in the studied soils. Besides testing more than one sorption isotherm model and error function combination, evaluating the shape of the sorption curve and excluding non-adsorption processes could be advised for reliable data evaluation in soil-metal sorption system.

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Section: The Shape Of the Sorption Curvesmentioning

confidence: 88%

Searching for optimum adsorption curve for metal sorption on soils: comparison of various isotherm models fitted by different error functions

Sipos

2021

SN Appl. Sci.

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show abstract

“…Therefore, its elimination is critically needed. The Cd(II) present in water could be eradicated through chemical precipitation, ion exchange, solvent extraction, membrane separation, electrochemical removal, coagulation, and adsorption [13][14][15][16][17][18][19][20][21]. In these techniques, adsorption is superior because of its high efficiency, relative simplicity in design, easy operation, and low operational cost [20,21].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Efficiency and Photocatalytic Activity of Silver Sulfide Nanoparticles Deposited on Carbon Nanotubes

et al. 2023

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A multimode, dual functional nanomaterial, CNTs-Ag2S, comprised of carbon nanotubes (CNTs) and silver sulfide (Ag2S) nanoparticles, was prepared through the facile hydrothermal process. Before the deposition of Ag2S nanoparticles, hydrophobic CNTs were modified to become hydrophilic through refluxing with a mixture of concentrated nitric and sulfuric acids. The oxidized CNTs were employed to deposit the Ag2S nanoparticles for their efficient immobilization and homogenous distribution. The CNTs-Ag2S could adsorb toxic Cd(II) and completely degrade the hazardous Alizarin yellow R present in water. The adsorption efficiency of CNTs-Ag2S was evaluated by estimating the Cd(II) adsorption at different concentrations and contact times. The CNTs-Ag2S could adsorb Cd(II) entirely within 80 min of the contact time, while CNTs and Ag2S could not pursue it. The Cd(II) adsorption followed the pseudo-second-order, and chemisorption was the rate-determining step in the adsorption process. The Weber−Morris intraparticle pore diffusion model revealed that intraparticle diffusion was not the sole rate-controlling step in the Cd(II) adsorption. Instead, it was contributed by the boundary layer effect. In addition, CNTs-Ag2S could completely degrade alizarin yellow R in water under the illumination of natural sunlight. The Langmuir-Hinshelwood (L-H) model showed that the degradation of alizarin yellow R proceeded with pseudo-first-order kinetics. Overall, CNTs-Ag2S performed as an efficient adsorbent and a competent photocatalyst.

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Amino-modified hollow alumina spheres: effective adsorbent for Cd2+, Pb2+, As(V), and diclofenac removal

Nikolić¹,

Tomić²,

Bugarčić

et al. 2021

Environ Sci Pollut Res

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Adsorption of Cadmium and Zinc Ions from Aqueous Solution Using Low Cost Adsorbents

Cited by 8 publications

References 2 publications

Searching for optimum adsorption curve for metal sorption on soils: comparison of various isotherm models fitted by different error functions

Searching for optimum adsorption curve for metal sorption on soils: comparison of various isotherm models fitted by different error functions

Adsorption Efficiency and Photocatalytic Activity of Silver Sulfide Nanoparticles Deposited on Carbon Nanotubes

Amino-modified hollow alumina spheres: effective adsorbent for Cd2+, Pb2+, As(V), and diclofenac removal

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