Adsorption of an anionic dye from aqueous solution on a treated clay

Avila, Maria Cecilia; Lick, Ileana Daniela; Comelli, Nora Alejandra; Ruiz, María Lucía

doi:10.1016/j.gsd.2021.100688

Cited by 20 publications

(10 citation statements)

References 58 publications

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“…The assumption on which the pseudo-second-order model depends is that chemisorption may be the rate-limiting step, which includes the exchanging or sharing of electrons between adsorbate and adsorbent by involving valence forces. The pseudo-second-order model shows the maximum adsorption capacity values and these results have been reported by other researchers [ 40 ]. Our results showed that methyl orange adsorption followed the pseudo-second-order model ( Figure 7 b).…”

Section: Resultssupporting

confidence: 88%

“…The primary supposition of the Langmuir model is that a monolayer forms on the adsorbent’s surface, meaning that a single dye molecule may be adsorbed on one adsorption site and that forces between molecules diminish with distance [ 39 ]. It was also expected that the surface of the adsorbent would be homogenous and have comparable and energetically similar adsorption sites ( Figure 6 a) [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Mutahir

Irfan²,

Nadeem³

et al. 2022

Molecules

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This work reports the formation of a novel adsorbent, prepared by activating bentonite with cinnamic acid, which is highly efficient to remove dyes from wastewater. The adsorption efficiency of the cinnamic acid activated bentonite was compared with unmodified bentonite by removing methyl orange and rhodamine-B from polluted water. The characterization was performed through X-ray diffraction (XRD) Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The results indicated that acidic pH and low temperature were more suitable for the selected dyes adsorption. The analysis of the data was done by the Langmuir and Freundlich isotherms; the Freundlich isotherm showed more suitability for the equilibrium data. The data were further analyzed by pseudo-first and pseudo-second-order models to study adsorption kinetics. The results showed that methyl orange and rhodamine-B adsorption obeyed pseudo-order kinetics. The results obtained from this research suggested that acid activation of bentonite with cinnamic acid increased the surface area of the clay and hence enhanced its adsorption efficiency. The maximum adsorption efficiency for the removal of methyl orange and rhodamine-B was up to 99.3 mg.g−1 and 44.7 mg.g−1, respectively, at 25 °C. This research provides an economical modification technique of bentonite, which makes it cost-effective and a good adsorbent for wastewater treatment.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Mutahir

Irfan²,

Nadeem³

et al. 2022

Molecules

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“…However, in the case of organo Mt-based nano pigments, there was a shift of the 2θ angle toward the higher angle from 5.3° to 5.62°, meaning that there was a decrease in the d-spacing from 17.11 Å to 15.7 Å, which may be due to either the agglomeration of organo Mt in the dye solution or intercalation of SO in the interlayer of organo Mt by However, in the case of organo Mt-based nano pigments, there was a shift of the 2θ angle toward the higher angle from 5.3 • to 5.62 • , meaning that there was a decrease in the d-spacing from 17.11 Å to 15.7 Å, which may be due to either the agglomeration of organo Mt in the dye solution or intercalation of SO in the interlayer of organo Mt by substituting the surfactant moiety. The dye adsorption on the surface was due to weak hydrogen bonding or van der Waals interactions between the dye molecule and O-plane of the outer surface of the clay layer [31,32]. On interaction with CPC, a new pair of vibrational bands at 2929 cm −1 and 2858 cm −1 was observed for Mt, which was due to the asymmetric and symmetric vibrations of the methylene group of the CPC, confirming the presence of CPC on the surface of OMt.…”

Section: Xrd Studies Of Mt and Omt Based Nano Pigmentsmentioning

confidence: 71%

Fabrication of Colored Polymeric Membrane Using Clay-Based Nano Pigments of Safranin O (SO) Dye

Mohan

Kumari

et al. 2023

Membranes

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In the present work, a novel methodology was developed for the fabrication of clay-based nano pigments with enhanced thermal stability and used further as a colorant to prepare polymeric membranes. Initially, the batch extraction studies were performed to analyze the maximum adsorption of Safranin O (SO) dye onto pristine montmorillonite (Mt) and organo montmorillonite (OMt) by varying different parameters like pH, contact time, and concentration. It was confirmed from batch extraction studies that the adsorption efficacy of pristine Mt for SO was found to be more than OMt due to their negatively charged surface. Clay-based nano pigments were fabricated by considering the optimized condition where the maximum uptake of SO was observed and further characterized by XRD, FTIR, TGA, and SEM techniques. XRD studies confirmed the intercalation of SO dye while FTIR spectra revealed surface interaction of the dye with Mt/OMt. TGA studies showed that the clay-based nano pigments had more thermal stability than pure SO. Nano pigments were used as colorants to prepare thin, transparent, and homogeneously dispersed polymeric membranes through the solvent casting method. XRD studies of the polymeric membrane confirmed that the intercalation of poly methylmethacrylate (PMMA) into the interlayer of clay increases interlayer spacing, which was further confirmed by the TEM analysis. The mechanical properties of the PMMA polymeric membrane were also enhanced after the dispersion of clay-based nano pigments.

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“…Among them, the adsorption technology has attracted much attention due to its high efficiency, reliability, simple operation, and economic feasibility. Activated carbon, ion exchange resins, natural zeolites, organic framework materials, , clay minerals, magnetic clay–carbon black, chitosan, and fiber material are widely used in adsorption technology.…”

Section: Introductionmentioning

confidence: 99%

Designed Construction of 2D Honeycomb Cationic MOF Materials for Selective Removal of Sulfonic Anionic Dyes

Wang

et al. 2023

Langmuir

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Various carcinogenic dyes in water bodies are difficult to degrade due to their stability to light and oxidants, causing extended pollution. In this study, MOF 1 ({[Co(tib)2]·(H2O)2·SO4} n ) and MOF 2 ({[Cu(tib)2]·(H2O)2·SO4} n ) (tib = 1,3,5-tirs(1-imidazolyl)benzene) were synthesized by the solvothermal method. MOFs 1 and 2 were successfully characterized by single-crystal X-ray diffraction (XRD) and powder X-ray diffraction (PXRD). Based on the structural characteristics of MOFs 1 and 2, we designed two cationic MOF material skeletons, namely, MOFs I and II ([Co(tib)2 2+] n and [Cu(tib)2 2+] n ), which were obtained by calcination in combination with the thermogravimetric curve to remove the free components in the lattice. As expected, MOFs I and II showed an excellent adsorption effect on sulfonic anionic dyes. Notably, the adsorption capacity of MOF I can reach 2922.8 mg g–1 for Congo Red (CR) at room temperature (RT). The adsorption process fits the pseudo-second-order kinetic model and Freundlich isotherm model. Moreover, zeta potential tests and quantum chemical calculations indicate that electrostatic interactions and hydrogen bond between the hydroxyl group on the sulfonic acid group and the N atom on the imidazole ring mainly promote the adsorption of CR dyes on MOF I. MOFs I and II are revealed as a promising novel adsorption material to remove hazardous organic aromatic pollutants with high efficiency in future endeavors.

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Adsorption of an anionic dye from aqueous solution on a treated clay

Cited by 20 publications

References 58 publications

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Fabrication of Colored Polymeric Membrane Using Clay-Based Nano Pigments of Safranin O (SO) Dye

Designed Construction of 2D Honeycomb Cationic MOF Materials for Selective Removal of Sulfonic Anionic Dyes

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