Investigation of copper adsorption on natural and microwave-treated bentonite

Kontsur, A.; Sysa, L.; Петрова, Маріанна Анатоліївна

doi:10.15587/1729-4061.2017.116090

Cited by 7 publications

(16 citation statements)

References 21 publications

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“…X-ray diffraction analysis of natural bentonite has been described in detail in our previous work [24]. The XRD phase analysis of the untreated bentonite revealed 4 minerals: hydromica (about 27 % at.…”

Section: The Surface Structure Of Microwave Treated Bentonite After Amentioning

confidence: 92%

“…The detailed description of the procedure of analytical processing of adsorption curves has been presented in our previous publications [23,24].…”

Section: Isotherms Fittingmentioning

confidence: 99%

“…Two methods of sorbent microwave treatment without adding acids or other activators were described earlier [19][20][21][22][23][24]. In so called STIM-method [19,21,23,24] natural bentonite is washed by bidistilled water and simultaneously irradiated with microwaves, later the sorbent is exposed to contact with salt solutionsa twostep procedure for activating the sorbent (i.e. "stimulation").…”

Section: Introductionmentioning

confidence: 99%

“…In the DIR-method (direct irradiation) [20,22,23] samples of natural bentonite contacted with aqueous salt solutions under the microwaves irradiation. It is proved [19][20][21][22][23][24] that both methods of bentonite microwave treatment lead to a significant increase in its maximum adsorption capacity of heavy metal ions Ni [19,20], Zn [21,22], Pb [23], Cu [24]. The advantage of DIR-method is the intense spontaneous crystallization of a new phase on the surface of the sorbent [20,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Copper adsorption from low concentrated solutions on microwave treated bentonite (MTB) (two-step activation, series STIM) was investigated. It has been shown that the pre-irradiation of bentonite by microwaves causes changes on the surface and improves its sorption parameters [24].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Adsorption of Copper Ions by Microwave Treated Bentonite

Stepova¹,

Sysa

Kontsur

et al. 2020

Phys. Chem. Solid St.

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Changes of bentonite surface structure under the influence of direct microwave irradiation during adsorpion of Cu2+ from concentrated solutions were investigated by X-ray and EDS analysis. The microwave treated bentonite (MTB) has been proved to have enhanced adsorption capacity for copper due to improved pore structure and some peculiarities of adsorption mechanism. The non-linear fitting of experimental data to the theoretical isotherms have demonstrated that the adsorption on natural bentonite fitted the Toth model, whilst microwave-treated bentonite fitted the Langmur-Freundlich model. The isotherm modeling allowed predicting the maximal adsorption capacities 44.8 mg/g. XRD and SEM analysis of MTB sample after adsorption indicated formation of microcrystals of individual copper compound. The adsorption on MTB sample takes place not only in pores or in monomolecular layer on the bentonite surface, but the prevalent mechanism is surface-induced co-precipitation of copper as microcrystals of individual copper compound.

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Section: The Surface Structure Of Microwave Treated Bentonite After Amentioning

confidence: 92%

“…The detailed description of the procedure of analytical processing of adsorption curves has been presented in our previous publications [23,24].…”

Section: Isotherms Fittingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of Copper Ions by Microwave Treated Bentonite

Stepova¹,

Sysa

Kontsur

et al. 2020

Phys. Chem. Solid St.

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Nonlinear Fitting of Iron Sorption on Bentonite to Theoretical Isotherm Models

Stepova

Sysa

Konanets

2022

Phys. Chem. Solid St.

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A comparative analysis of adsorption models application for the description of experimental isotherms of iron adsorption on two samples: natural bentonite and bentonite irradiated with microwave irradiation. Sorption isotherms are described using the theories of Langmuir, Freundlich, Redlich-Peterson and Langmuir-Freundlich. The constants and parameters of these equations are determined. Nonlinear fitting of experimental data to the theoretical models of isotherms showed that adsorption by native bentonite corresponds to the three-parameter Redlich-Peterson model, and microwave irradiated - to the Freindlich isotherm. This modeling allows to predict the maximum adsorption capacity, which is 37.7 mg / g of natural bentonite and 64.4 mg / g of the modified sample.

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Perspectives of Treatment of Water Environments from Pollutants with Ultrasound-Activated Bentonites

Kochubei,

Yaremchuk,

Malovanyy

et al. 2023

ChChT

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The paper analyzes the perspectives for natural sorbents to be used in environmental technologies. The object of the study is the clay rock from the left side of the upper Pivdennyi Bug river (in the vicinity of the Khmelnytskyi city). The rock was enriched in montmorillonite by centrifugation of a clay suspension to obtain the fraction with a size of less than 5∙10-6 m. The researchers defined the mineral composition of the enriched clay based on the findings of the X-ray diffraction and complex thermal analyses. The enriched clay was chemically activated with a 5% NaCl aqueous solution and physically activated with the action of ultrasound. Based on the results of the X-ray diffraction analysis, the cation exchange capacity (CEC) of enriched clays, both natural and activated by ultrasound, was found against the methylene blue (MB) dye. The findings of the X-ray diffraction and analysis supported the ability of the dye cations to be absorbed by the interlayer spacings of montmorillonite.

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Investigation of copper adsorption on natural and microwave-treated bentonite

Cited by 7 publications

References 21 publications

Adsorption of Copper Ions by Microwave Treated Bentonite

Adsorption of Copper Ions by Microwave Treated Bentonite

Nonlinear Fitting of Iron Sorption on Bentonite to Theoretical Isotherm Models

Perspectives of Treatment of Water Environments from Pollutants with Ultrasound-Activated Bentonites

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