Insights on applications of bentonite clays for the removal of dyes and heavy metals from wastewater: a review

Dhar, Avik Kumar; Himu, Humayra Akhter; Bhattacharjee, Maitry; Mostufa, Md. Golam; Parvin, Fahmida

doi:10.1007/s11356-022-24277-x

Cited by 30 publications

(8 citation statements)

References 276 publications

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“…From the observation of Figure 5, we find that the shape of the curve begins to rise with the increase in the adsorbent surface dose. This height value indicates that the amount of adsorbent surface has reached saturation, which depends on the bentonite clay's physical properties [23]. The results show that the bes t dose of bentonite clay for adsorption of the methylene blue dye solution is 0.2 gm.…”

Section: Determination Of the Clay Dosementioning

confidence: 90%

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Jaber Ibrahim,

Abdul Wahid Dwesh,

R.Y. Al-Sawad

2023

Anal. Method Environ. Chem. J.

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This study uses the UV-Vis technique to describe the elimination of methylene blue dye from an aqueous solution by adsorption on an Iraqi bentonite clay surface. The batch approach was used to conduct adsorption studies carried out to evaluate the influence of factors of experimental like contact time (0–90 min), clay dose (0.1–0.35 g), and initial dye concentration (10–125 mg L-1) at the range of temperatures (25-40oC). The Langmuir and the Freundlich isotherms were used to analyze the data; the Langmuir isotherm (R2 = 0.998) proved more appropriate for the equilibrium data. The thermodynamic properties of the adsorption process, including Gibbs free energy (ΔGO), entropy(ΔSO), and enthalpy (ΔHO), were also studied. Since the (ΔGO) and (ΔHO) values were negative, it was clear that the adsorption process constituted an exothermic, spontaneous reaction. This investigation revealed that Iraqi bentonite clay effectively removed the dye methylene blue because of its high surface area. Methylene blue may be removed with an adsorption efficiency of up to 99.39 % at 25oC. By employing bentonite clay as an adsorbent surface, this research offers practical adsorption technology that is affordable and effective for treating wastewater.

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Section: Determination Of the Clay Dosementioning

confidence: 90%

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Jaber Ibrahim,

Abdul Wahid Dwesh,

R.Y. Al-Sawad

2023

Anal. Method Environ. Chem. J.

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“…However, the cations are easily exchanged for organic cationic surfactants, ultimately achieving the intercalation of organic cationic surfactants. This is often called the organic modification of montmorillonite [27,28]. After being intercalated, the chains of surfactants must extend to interlamination, due to space limitation, which increases the amount of available space, finally resulting in an enlargement of the interlayer pores [29,30].…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Yang,

Chen

et al. 2024

Materials

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The organic modification of montmorillonite was successfully achieved using cetyltrimethyl ammonium bromide under facile conditions. The modified montmorillonite was subsequently used for the fabrication of montmorillonite-induced nanopore-rich cement paste (MNCP), and the shrinkage behavior and fundamental performance of MNCP were also investigated. The results indicate that alkali cations on a montmorillonite layer surface were exchanged by using CTAB under 80 °C, successfully achieving the organic modification of montmorillonite. As a pore-forming agent, the modified montmorillonite caused a reduction in shrinkage: the 28-day autogenous shrinkage at a design density of 400 kg/m3 and 800 kg/m3 was reduced to 2.05 mm/m and 0.24 mm/m, and the highest reduction percentages during the 28-day drying shrinkage were 68.1% and 62.2%, respectively. The enlarged interlamellar pores and hydrophobic effects caused by the organic modification of montmorillonite aided this process. Organic-modified montmorillonite had a minor influence on dry density and thermal conductivity and could contribute to an enhancement of strength in MNCP.

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“…In addition to the original research papers published in this field, numerous review articles have been published analyzing the adsorption of dye molecules on clay minerals and attempting to systematically organize the knowledge on this subject [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. These attempts have been made to find a system of laws between the nature and structure of the interacting species and the characteristics of the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Controversial Issues Related to Dye Adsorption on Clay Minerals: A Critical Review

Bujdák

2023

Molecules

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This critical review points out the most serious and problematic issues to be found in the literature on the adsorption of dyes on clay minerals. The introduction draws attention to the fundamental problems, namely the insufficient characterization of adsorbents, the influence of impurities on the adsorption of dyes, and the choice of inappropriate models for the description of the very complex systems that clay minerals and their systems represent. This paper discusses the main processes accompanying adsorption in colloidal systems of clay minerals. The relationship between the stability of the colloidal systems and the adsorption of dye molecules is analyzed. The usual methodological procedures for determining and evaluating the adsorption of dyes are critically reviewed. A brief overview and examples of modified clay minerals and complex systems for the adsorption of organic dyes are summarized. This review is a guide for avoiding some faults in characterizing the adsorption of organic dyes on clay minerals, to improve the procedure for determining adsorption, to evaluate results correctly, and to find an appropriate theoretical interpretation. The main message of this article is a critical analysis of the current state of the research in this field, but at the same time, it is a guide on how to avoid the most common problems and mistakes.

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Insights on applications of bentonite clays for the removal of dyes and heavy metals from wastewater: a review

Cited by 30 publications

References 276 publications

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Controversial Issues Related to Dye Adsorption on Clay Minerals: A Critical Review

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