Methylene Blue Adsorption on Natural and Modified Clays

Sarma, Gautam Kumar; SenGupta, Susmita; Bhattacharyya, Krishna G.

doi:10.1080/01496395.2011.565012

Cited by 48 publications

(23 citation statements)

References 33 publications

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“…This electrostatic interaction between the negatively charged groups on the surface of SnO 2 and the dye cations improved the dye adsorption performance of SnO 2 nanostructures. Similar observations were also reported by other researchers as well with other metal oxides . Apart from the hydroxylated groups, the negatively charged NaCMC chains anchored on the surface of hollow SnO 2 nanostructures possessing higher surface area provide extra electrostatic bindings with cationic dyes and thereby results in better adsorption efficiency.…”

Section: Resultssupporting

confidence: 89%

Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal

2016

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Herein, we report the synthesis of SnO2 nanostructures by alkaline hydrolysis of the corresponding metal ions in presence of biopolymer additive such as carboxy methylcellulose at 65 °C. X‐ray diffraction studies confirmed the formation of pure crystalline tetragonal SnO2 nanostructures. Microscopic results revealed that addition of biopolymer results in the formation of hollow nanostructures. The sizes of such hollow nanostructures are controllable by varying the concentration of the biopolymer. The hollow nanostructures are further characterized by other spectroscopic techniques such as UV‐vis spectroscopy, photoluminescence spectroscopy, X‐ray photoelectron spectroscopy and energy dispersive X‐ray spectroscopy. These hollow SnO2 nanostructures are porous and show excellent adsorption capability in removal of organic dye, methylene blue from its aqueous solution at room temperature. The recovered SnO2 nanostructures can be reused in successive batches for dye adsorption without much losing its adsorption capacities.

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Section: Resultssupporting

confidence: 89%

Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal

2016

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“…Among other clay mineral modification techniques, acid activation is one of the most common, easy and effective chemical treatment of clays, where the clay is treated with a mineral acid like HCl or H 2 SO 4 to obtain partly dissolved amorphous Si-rich phase with less impurity. In our previous study, acid-treated kaolinite showed very good adsorption capacity for dyes like Methylene blue [17], Congo red [18] and Rhodamine B [19] from the water.…”

Section: Introductionmentioning

confidence: 87%

Removal of hazardous basic dyes from aqueous solution by adsorption onto kaolinite and acid-treated kaolinite: kinetics, isotherm and mechanistic study

Sarma

Gupta²,

Bhattacharyya

2019

SN Appl. Sci.

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Presence of dye molecules in water causes various harmful effects for both human and aquatic species. Herein, we tried to remove two cationic dyes, namely Crystal violet and Brilliant green, from water by kaolinite clay mineral. The kaolinite clay mineral is further treated with 0.25 M and 0.05 M H 2 SO 4 to increase its adsorption capacity. The structural changes due to acid treatment were analyzed by XRD, zeta potential, FTIR, SEM, cation exchange capacity, BET surface area, and pore volume measurements. Kinetic data were analyzed by using five different kinetic models and the data fitted best to pseudo-second-order model. Langmuir isotherm showed best fit to the adsorption of both Crystal violet and Brilliant green. Acid-treatment has slightly increased the adsorption capacities for both the dyes. The Langmuir monolayer adsorption capacity of raw kaolinite was found to be 47.17 and 25.70 mg g −1 for Crystal violet and Brilliant green, respectively, which increased to 49.50 and 50.51 mg g −1 for 0.25 M and 0.50 M acid-treated kaolinite in case of Crystal violet and to 26.45 and 26.88 mg g −1 in case of Brilliant green at 303 K. Crystal violet adsorption was exothermic with increase in ∆G values, whereas Brilliant green adsorption was endothermic in nature with decrease in ∆G in the temperature range 293-323 K. Reusability study showed the adsorbents could be successfully used up to 3rd cycle without much loss of adsorption capacity.

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“…Among the various available technologies, adsorption is known to have various advantages as compared to the other techniques. The adsorption technique is cost effective, simple and flexible, easy to operate and control etc [6,7]. The choice and type of adsorbent may depend on parameters such as cost, availability, toxicity and regeneration and re-usability etc.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methylene blue onto natural Saudi Red Clay: isotherms, kinetics and thermodynamic studies

Khan

2020

Mater. Res. Express

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The current work investigates the adsorption behavior of methylene blue (MB) from aqueous solution using natural Saudi Red Clay (SRC) adsorbent. The surface characteristics of the adsorbent were investigated using surface area measurements (S BET ), Scanning Electron Microscopy (SEM), X-ray florescence (XRF) and Fourier-Transform Infrared Spectroscopy (FTIR) and x-ray diffraction (XRD).Various process parameters such as pH, adsorbent dosage, initial dye concentration, contact time and temperature were investigated. MB removal efficiency was noticed to increase with increasing adsorbent dosage while the effect of pH was noticed to be insignificant for the pH range studied. Applying the Langmuir isotherm fitting to the experimental data, a maximum adsorption capacity was found to be 50.25 mg g −1 of clay at 298 K. Pseudo-first-order and pseudo-second-order models were applied to the experimental data to study the kinetics of the process. Pseudo-second-order model fitted well with the experimental as compared to the pseudo-first order model. The spontaneous and endothermic nature of the adsorption process was revealed by studying the thermodynamic parameters of the system. The positive ΔS°value indicates the affinity of MB molecules to the adsorbent surface. Re-usability/recycling study showed that this material can be successfully reused at least four times in this study without significant loss in the adsorption capabilities.

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Methylene Blue Adsorption on Natural and Modified Clays

Cited by 48 publications

References 33 publications

Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal

Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal

Removal of hazardous basic dyes from aqueous solution by adsorption onto kaolinite and acid-treated kaolinite: kinetics, isotherm and mechanistic study

Adsorption of methylene blue onto natural Saudi Red Clay: isotherms, kinetics and thermodynamic studies

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Methylene Blue Adsorption on Natural and Modified Clays

Cited by 48 publications

References 33 publications

Facile Biopolymer Assisted Synthesis of Hollow SnO2 Nanostructures and Their Application in Dye Removal

Facile Biopolymer Assisted Synthesis of Hollow SnO2 Nanostructures and Their Application in Dye Removal

Removal of hazardous basic dyes from aqueous solution by adsorption onto kaolinite and acid-treated kaolinite: kinetics, isotherm and mechanistic study

Adsorption of methylene blue onto natural Saudi Red Clay: isotherms, kinetics and thermodynamic studies

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Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal

Facile Biopolymer Assisted Synthesis of Hollow SnO₂ Nanostructures and Their Application in Dye Removal