Sustainable and rapid pillared clay synthesis with applications in removal of anionic and cationic dyes

Hari, Desai; Kannan, A.; Reddy, G. Sai Kumar

doi:10.1016/j.micromeso.2023.112488

Cited by 14 publications

(10 citation statements)

References 75 publications

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“…Ltd., Mumbai, India. CrPC and AlPC were synthesized using the procedure described in [3]. AV-19 was purchased from SRL Pvt.…”

Section: Materials and Methodologymentioning

confidence: 99%

“…Energy Dispersive X-ray (EDS) analysis used Oxford Instruments (X-MaxN). The ICEPR 138-2 point of zero charge (pHZC), which indicates the nature of a surface charge on the adsorbent surface as a function of pH, was estimated using the method discussed in [3].…”

Section: Materials and Methodologymentioning

confidence: 99%

“…Pillared clays are synthesized by intercalating bulky cations into the clay matrix, which form stable pillars after calcination. Metal polycations such as are the most efficient for developing pillared clays [3].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Organic Dye on Pillared Clays

Desai,

2023

Proceedings of the 9th World Congress on New Technologies

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Naturally occurring bentonite clay is pillared with Cr-polycations and Al-polycations to overcome the swelling nature of the clay upon contact with water. Chromium Pillared Clay (CrPC) and Aluminium Pillared Clay (AlPC) were characterized using Scanning Electron Microscope, X ray diffraction, Energy dispersive X ray analysis and point of zero charge. The basal spacing increase in the interlamellar space confirmed the successful pillaring of clays. Acid Violet 19 (AV-19) dye was used as model adsorptive. Batch adsorption kinetic studies at ambient conditions revealed that the Pseudo Second Order (PSO) model could characterize the adsorption. The PSO rate constant for CrPC and AlPC were 0.0082 g/mg min and 0.0831 g/mg min, respectively. Langmuir isotherm fitted the equilibrium results for both the adsorption systems. The maximum adsorption capacity for the AV-19 dye on CrPC was 37.54 mg/g, while it was 24.33 mg/g for AlPC at ambient conditions. Thermodynamic analysis showed that the adsorption in both adsorbents was endothermic. The effect of pH on adsorption capacity suggested that electrostatic interactions were the primary contributing mechanism for dye adsorption on CrPC and AlPC. The results showed that the pillared clay adsorbents effectively treated the AV-19 dye-containing wastewater.

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“…Ltd., Mumbai, India. CrPC and AlPC were synthesized using the procedure described in [3]. AV-19 was purchased from SRL Pvt.…”

Section: Materials and Methodologymentioning

confidence: 99%

Section: Materials and Methodologymentioning

confidence: 99%

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Adsorption of Organic Dye on Pillared Clays

Desai,

2023

Proceedings of the 9th World Congress on New Technologies

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“…Desai et al developed chromium-metal polycations intercalated with bentonite as adsorbents with varying chromium content using an economical and sustainable method. These adsorbents were used to remove two different dyes: cationic Basic Orange II and anionic Acid Blue 74 [24].…”

Section: Introductionmentioning

confidence: 99%

Performance of Mg/Al and Zn/Al Hydroxide Double Lamellar-Bentonite for Removal of Anionic Azo Dye from Aqueous Solution

Bouhent,

Bentaleb,

Al-Ameri

et al. 2024

Processes

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This paper presents the preparation and characterization of bentonite coated with hydroxide double lamellar Mg/Al-bentonite and Zn/Al-bentonite as a potential adsorbent material. The coating process involved co-precipitation of mixed metal nitrate solution (Mg-Al) or (Zn-Al), followed by immersion of bentonite (B-Na+) dispersion. The structures and morphologies of the coated bentonites were characterized using XRD, FTIR, BET, and SEM analysis. The results of the BET analysis indicate that Mg/Al-bentonite and Zn/Al-bentonite have larger surface areas and pore volumes compared to bentonite alone. Specifically, the surface area of Mg/Al-bentonite is 209.25 m2/g with a pore volume of 0.423 cm3/g, while Zn/Al-bentonite has a surface area of 175.95 m2/g and a pore volume of 0.313 cm3/g. In contrast, the surface area and pore volume of bentonite alone are 110.43 m2/g and 0.132 cm3/g, respectively. The Mg/Al-bentonite reaches 85% uptake within 3 h (equivalent to 724.20 mg/g at 25 °C and pH 7), achieving rapid equilibrium. In contrast, the Zn/Al-bentonite achieves a maximum adsorption of 74% within 5 h under identical pH and temperature conditions, corresponding to 650.34 mg/g. The error function values, including the correlation coefficient R2, chi-square test χ2, and residual sum of squares RSS, were calculated to evaluate both kinetic and isotherm models. The kinetic adsorption data agreed well with a pseudo-second-order model. The adsorption process followed the Sips isotherm model, and the monolayer adsorption capacity of Mg/Al-bent and Zn/Al-bent composites was 872.41 (R2 = 0.974) and 678.45 mg/g (R2 = 0.983), respectively. The thermodynamic analysis of the adsorption process revealed that it occurred spontaneously with an endothermic characteristic. The parameters ΔS, ΔH, and ΔG were used to determine this.

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“…On the other hand, over the past 20 years, many scientific research papers have shown that clay-based materials are promising adsorbents for environmental applications such as water purifications of toxic organic compounds, especially surfactant-modified clays that have a higher adsorption capacity than the original clay [11,12]. However, most Brazilian Journal of Development, Curitiba, v.9, n.11, p. 29886-29910, nov., 2023 of the work concerning the adsorption of organic compounds on clays has been carried out on functional molecules, comprising at least one OH function and/or one halogen atom [13][14][15] such as dyes [16,17].…”

Section: Introductionmentioning

confidence: 99%

Exploring organo-bentonite adsorption properties for biphenyl removal from organic-aqueous media: kinetic study and industrial perspective

Gherdaoui,

Aldoori,

Alaoui

et al. 2023

Braz. J. Develop.

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Biphenyl, a frequently encountered and resilient compound in wastewater, proves resistant to conventional treatment methods because of its enduring nature. It forms the structural basis for persistent organic pollutants such as PCBs. In this study, we explored the adsorption of biphenyl in an organo-aqueous medium using both natural (Bent) and organomodified (CTAB-Bent) bentonite clay. Our objective was to highlight its potential for biphenyl wastewater treatment. We analyzed the physicochemical and textural properties of these clays through FTIR, XRF, XRD, SEM, BET method, and Zeta potential measurements. Impressively, these materials exhibited remarkable biphenyl adsorption capacity under acidic conditions, with Bent achieving 60% removal and CTAB-Bent an impressive 91%. We investigated the adsorption kinetics using first-order and pseudo-second-order models and assessed isotherm data with the Langmuir, Freundlich, and Langmuir-Freundlich (sips) equations. The Langmuir model, at pH 3, proved optimal, with high accuracy (R²) and minimal error (RMSE) values (0.997 and 1.20, respectively). Clay nature significantly influenced pollutant uptake efficiency, confirming the efficacy of the selected bio-based clay. We propose a protocol adaptable for industrial-scale applications.

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Sustainable and rapid pillared clay synthesis with applications in removal of anionic and cationic dyes

Cited by 14 publications

References 75 publications

Adsorption of Organic Dye on Pillared Clays

Adsorption of Organic Dye on Pillared Clays

Performance of Mg/Al and Zn/Al Hydroxide Double Lamellar-Bentonite for Removal of Anionic Azo Dye from Aqueous Solution

Exploring organo-bentonite adsorption properties for biphenyl removal from organic-aqueous media: kinetic study and industrial perspective

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