Removal of Brilliant Blue FCF from Aqueous Solutions Using an Unmodified and Iron-Modified Bentonite and the Thermodynamic Parameters of the Process

Hernández-Hernández, K. A.; Solache‐Ríos, M.; Díaz-Nava, M. C.

doi:10.1007/s11270-013-1562-9

Cited by 37 publications

(13 citation statements)

References 22 publications

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“…However, a considerable change of entropy can be observed showing that TSOBC change significantly as a result of adsorption. Furthermore, the positive value of ΔH° (165.44 kJ/mol) also confirms the endothermic nature of the adsorption of Cr(VI) on TSOBC and increasing temperature favors the adsorption process[79,80].…”

mentioning

confidence: 56%

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

Dehghani¹,

Zarei²,

Mesdaghinia³

et al. 2017

Desalination and Water Treatment

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a b s t r a c tChromium, as a serious environmental contaminant, is frequently encountered in different industrial effluents. In the present study, we focused on the combined application of a surfactant-modified bentonite and chitosan for the removal of Cr(VI). In addition, the effects of several important parameters such as pH (2-8), adsorbent dosage (0.1-1.5 g/L), Cr(VI) concentration (20-200 mg/L) and contact time (60-240 min) were also investigated and the process was optimized by means of response surface methodology. The analysis of variance of the quadratic model demonstrates that the model was highly significant. Optimized values of pH, adsorbent dosage, initial Cr(VI) concentration and contact time were found to be 3.7, 1.40 g/L, 77 mg/L and 180 min, respectively. The results revealed that the prepared adsorbent had significant adsorption capacity (124.1 mg/g) for Cr(VI). All results showed that thermally sodium organo-bentonite biopolymer composite (TSOBC) had a good affinity toward Cr(VI). Among the isotherm models tested, Langmuir isotherm model was found to be the best fit for the obtained data. The adsorption kinetics indicated that Cr(VI) adsorption on TSOBC followed pseudo-second-order better than pseudo-first-order model. Moreover, thermodynamic studies showed that adsorption of Cr(VI) on TSOBC was spontaneous and endothermic in nature. The applied adsorbent was characterized by scanning electron microscopy, X-ray diffraction, energy dispersive X-ray and Fourier-transform infrared spectroscopic techniques.

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mentioning

confidence: 56%

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

Dehghani¹,

Zarei²,

Mesdaghinia³

et al. 2017

Desalination and Water Treatment

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“…The negative values of ΔG indicate the feasibility and spontaneous nature of coomassie brilliant blue dye adsorption on NSWC 17 . The change in enthalpy ΔH° for CBB adsorption process was found to be negative which indicates the exothermic nature of the adsorption at the studied temperature range (25-50C°) 35 . Also, the negative value of the adsorption entropyDS° demonstrates the decreased randomness at the solid-solution interface during adsorption …”

Section: Freundlich Isothermmentioning

confidence: 84%

Adsorption of Coomassie Brilliant Blue R-250 Dye Onto Novel Activated Carbon Prepared From Nigella Sativa L. Waste: Equilibrium, Kinetics and Thermodynamics Running Title: Adsorption of Brilliant Blue Dye Onto Nigella Sativa L. Waste Activated Carbon

Abdel‐Ghani

El-Chaghaby

Rawash

et al. 2017

J. Chil. Chem. Soc.

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In this paper a novel adsorbent was prepared from Nigella sativa L. waste and used for the removal of Coomassie Brilliant Blue dye from wastewater. The preparation of Nigella sativa waste carbon (NSWC) was achieved by adding concentrated sulfuric acid to the precursor material at an impregnation ratio (1: 1) and the mixture was left overnight. The resulting material was washed with sodium bicarbonates and finally oven dried. The kinetics of coomassie brilliant blue adsorption onto NSWC was investigated by three kinetic models. The pseudo-second order model (R 2 = 0.99) was the best model fitted the experimental data. The equilibrium results revealed that Freundlich model was the best isotherm model fitted (R 2 = 0.994). Also the value of the Freundlich exponent (n) was found to be 1.174 suggesting the favorable dye adsorption onto NSWC. The thermodynamics results indicated negative values of ΔG proving the spontaneous nature of Brilliant Blue dye adsorption on NSWC. The exothermic nature of the adsorption was also confirmed by the negative value of change in enthalpy ΔH°. Also, the negative value of the activation entropy ∆S° demonstrates the decreased randomness at the solid-solution interface during adsorption. The present study results suggest the possible use of a waste such as Nigella sativa L. waste as a precursor for the development of a new cheap and efficient adsorbent that could be used in dyes removal from wastewater.

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“…As is well known, sorption process is complicated and multistage therefore traditional kinetic models are not always suitable to describe complex adsorption treatment. In this regard, to describe the sorption kinetics in modern scientific literature (Günay et al, 2013;Hernandez et al, 2013;Elmoubarki et al, 2015) the kinetic model of the pseudo-first order, pseudo-second order model and diffusion Boyd-Adamson model are used, which reveal the influence of the chemical stage.…”

Section: Adsorption Kinetic Parametersmentioning

confidence: 99%

“…The pseudo-first order model of speed is the earliest sorption kinetics model and is represented in the form (Günay et al, 2013;Hernandez et al, 2013;Elmoubarki et al, 2015):…”

Section: Adsorption Kinetic Parametersmentioning

confidence: 99%

“…where C 0 and С t is initial surfactant concentration and concentration of surfactant in solution at time t, respectively, mg/l; V is model solution volume, l; mmass of sorbent sample, g. For description of sorption process in aqueous solution pseudo-second order model of speed is also used (Günay et al, 2013;Hernandez et al, 2013;Elmoubarki et al, 2015):…”

Section: Adsorption Kinetic Parametersmentioning

confidence: 99%

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Removal of anionic surfactants from wastewater by magnetic mineral sorbents

Makarchuk

Dontsova

2016

Journal of Water Security

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The simplest and most effective method of removing low concentrations of anionic surfactants such as sodium dodecyl benzenesulfonate (SDBS) and sodium lauryl sulfate (SLS) is adsorption. Among adsorbents the natural clays are cheap and promising for these purposes. However, there are significant difficulties in removal of spent sorbent after the adsorption process. So, the creation of magnetic sorbents that can be effectively removed from water after sorption by magnetic separation will be a successful decision. The aim of this investigation is the creation of cheap and efficient magnetic sorbents based on natural clays and magnetite for anionic surfactant removal from wastewater. We have synthe-sized a series of magnetic sorbents from different natural clays with a content of magnetite from 2 to 10 wt%. The ability of magnetic sorbents to remove SDBS and SLS from aqueous solutions has been studied for different adsorbate concen-trations by varying the amount of adsorbent, temperature and shaking time. Thermodynamic parameters were calculated from the slope and intercept of the linear plots of ln K against 1/T. Analysis of adsorption results obtained at different temperatures showed that the adsorption pattern on magnetic sorbents correspond to the Langmuir isotherm. It is shown that with increasing the content of magnetite in the magnetic sorbents improves not only their separation from water by magnetic separation, but adsorption capacity to SDBS and SLS. Thus, we obtained of cheap magnetic sorbents based on natural clays and magnetite by the easy way, which not only quickly separated from the solution by magnetic separation, but effectively remove anionic surfactants.

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Removal of Brilliant Blue FCF from Aqueous Solutions Using an Unmodified and Iron-Modified Bentonite and the Thermodynamic Parameters of the Process

Cited by 37 publications

References 22 publications

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

Adsorption of Coomassie Brilliant Blue R-250 Dye Onto Novel Activated Carbon Prepared From Nigella Sativa L. Waste: Equilibrium, Kinetics and Thermodynamics Running Title: Adsorption of Brilliant Blue Dye Onto Nigella Sativa L. Waste Activated Carbon

Removal of anionic surfactants from wastewater by magnetic mineral sorbents

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