Adsorptive removal of methylene blue from aqueous solutions by porous boron carbide: isotherm, kinetic and thermodynamic studies

Uğraşkan, Volkan; Işık, Birol; Yazıcı, Özlem

doi:10.1080/00986445.2021.1948406

Cited by 31 publications

(10 citation statements)

References 111 publications

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“…Once the surface is saturated, MB diffuses into the material's interior, where adsorption continues, and subsequently lowers the adsorption rate 6 , 65 . Eltarahony et al 18 reported an equilibrium time of 2 h. Also, Ugraskan et al 66 mentioned that the ideal contact time was 90 min for the adsorption of MB onto porous boron carbide. While Ugraskan et al 66 reported that the optimum contact time of MB onto Judas tree ( Cercis siliquastrum ) seeds was determined to be 60 min, which agreed with our results.…”

Section: Resultsmentioning

confidence: 99%

Pseudomonas alcaliphila NEWG-2 as biosorbent agent for methylene blue dye: optimization, equilibrium isotherms, and kinetic processes

Ghoniem

Moussa

Alenzi

et al. 2023

Sci Rep

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In comparison to physicochemical and chemical methods, microbial dye biosorption is regarded as an eco-effective and economically viable alternative and is a widely applied method due to its high efficiency and compatibility with the environment. Therefore, the idea of this study is to clarify to what extent the viable cells and the dry biomass of Pseudomonas alcaliphila NEWG-2 can improve the biosorption of methylene blue (MB) from a synthetic wastewater sample. The array of Taguchi paradigm has been conducted to ascertain five variables affecting the biosorption of MB by broth forms of P. alcaliphila NEWG. The data of MB biosorption were familiar to the predicted ones, indicating the precision of the Taguchi model’s prediction. The maximum biosorption of MB (87.14%) was achieved at pH 8, after 60 h, in a medium containing 15 mg/ml MB, 2.5% glucose, and 2% peptone, with sorting the highest signal-to-noise ratio (38.80). FTIR spectra detected various functional groups (primary alcohol, α, β-unsaturated ester, symmetric NH2 bending, and strong C–O stretching) on the bacterial cell wall that participated in the biosorption of MB. Furthermore, the spectacular MB biosorption ability was validated by equilibrium isotherms and kinetic studies (the dry biomass form), which were derived from the Langmuir model (qmax = 68.827 mg/g). The equilibrium time was achieved in about 60 min, with 70.5% of MB removal. The biosorption kinetic profile might be adequately represented by pseudo-second order and Elovich models. The changes in the bacterial cells before and after the biosorption of MB were characterized using a scanning electron microscope. As realized from the aforementioned data, the bacterium is a talented, effective, eco-friendly, and low-cost bio-sorbent for the decolorization and remedy of an industrial effluent containing MB from an aqueous environment. The current outcomes in the biosorption of MB molecules promote the use of the bacterial strain as viable cells and/or dry biomass in ecosystem restoration, environmental cleanup, and bioremediation studies.

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Section: Resultsmentioning

confidence: 99%

Pseudomonas alcaliphila NEWG-2 as biosorbent agent for methylene blue dye: optimization, equilibrium isotherms, and kinetic processes

Ghoniem

Moussa

Alenzi

et al. 2023

Sci Rep

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“…( 5). q e and k 1 depict the sorption capacity at EQB (mg/L) and rate constant (1/min), which is assessed through an experiment from gradient and intercept from the log(q e − q t ) against t graph (El Nemr et al 2010; Ugraskan et al 2021;Sizirici et al 2018;Bayuo 2021). In the PSO, the sorbate-sorbent interactions during the sorption procedure are taken into consideration.…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…q m , ε and K represent the theoretic sorption capacity (mg/g), the Polanyi potential and the sorption free energy per sorbate molecule constant (mol 2 / kJ 2 ). The K value is derived from the gradient of the graph of ln q e against ε 2 (Ugraskan et al 2021). Results of the experimental data fitting employing various isotherm models and their plots are shown in Fig.…”

Section: Isotherm Modelsmentioning

confidence: 99%

Adsorption of Cr6+ ion using activated Pisum sativum peels-triethylenetetramine

El‐Nemr

Aigbe

Ukhurebor

et al. 2022

Environ Sci Pollut Res

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The adsorption of Cr6+ ions from water-soluble solution onto activated pea peels (PPs) embellished with triethylenetetramine (TETA) was studied. The synthesized activated TETA-PP biosorbent was further characterized by SEM together with EDX, FTIR and BET to determine the morphology and elementary composition, functional groups (FGs) present and the biosorbent surface area. The confiscation of Cr6+ ions to activated TETA-PP biosorbent was observed to be pH-reliant, with optimum removal noticed at pH 1.6 (99%). Cr6+ ion adsorption to activated TETA-PP biosorbent was well defined using the Langmuir (LNR) and the pseudo-second-order (PSO) models, with a determined biosorption capacity of 312.50 mg/g. Also, it was found that the activated TETA-PP biosorbent can be restored up to six regeneration cycles for the sequestration of Cr6+ ions in this study. In comparison with other biosorbents, it was found that this biosorbent was a cost-effective and resourceful agro-waste for the Cr6+ ion confiscation. The possible mechanism of Cr6+ to the biosorbent was by electrostatic attraction following the surface protonation of the activated TETA-PP biosorbent sites. Graphical abstract

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“…In this contribution, we set out to prove that the mathematical form of the FH isotherm as used in water contaminant adsorption research is fallacious because it has been inappropriately linearized. This erroneous form of the FH isotherm can be found in all the articles listed in Table as well as the reviews cited above. − Furthermore, we draw attention to another fallacy concerning the use of faulty equilibrium constants derived from the linearized FH isotherm to calculate the Gibbs free energy change.…”

Section: Introductionmentioning

confidence: 97%

“…Since the mid-2000s, many studies have reported the modeling of water contaminant adsorption by means of the FH isotherm. Table presents a selection of such studies published across a broad spectrum of scholarly journals. − As can be seen in Table , the experimental isotherms of numerous water contaminants, ranging from toxic metals to organic compounds, have been described by the FH isotherm. The inclusion of the FH isotherm in several reviews has no doubt promoted its use in this field of research. − …”

Section: Introductionmentioning

confidence: 99%

The Flory–Huggins Isotherm and Water Contaminant Adsorption: Debunking Some Modeling Fallacies

Chu

Hashim

Bashiri

et al. 2023

Ind. Eng. Chem. Res.

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The Flory–Huggins (FH) isotherm first appeared in the literature of water contaminant adsorption in the mid-2000s. It has come into the limelight and received considerable attention in recent years, in large part due to regular coverage in review articles. Here, we point out that a linear form of the FH isotherm is incompatible with the original nonlinear version. We show conclusively that the original FH isotherm was destroyed beyond recognition by the linearization method. As a result, the linearized FH isotherm suffers from the following serious defects: (1) Its parameter estimates are incorrect and nonsensical. (2) It is not possible to plot standard isotherm curves in the form of adsorbed phase concentration versus liquid phase concentration. These anomalies, or “red flags”, that arise in the use of the linearized FH isotherm in data correlation are reported for the first time. To avoid publishing meaningless research, it is advisable to use the original form of the FH isotherm in data fitting. To go beyond routine application (e.g., simple data correlation and thermodynamic calculation), this work describes a novel application that uses the FH isotherm to evaluate the energy distribution of heterogeneous adsorbents.

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Adsorptive removal of methylene blue from aqueous solutions by porous boron carbide: isotherm, kinetic and thermodynamic studies

Cited by 31 publications

References 111 publications

Pseudomonas alcaliphila NEWG-2 as biosorbent agent for methylene blue dye: optimization, equilibrium isotherms, and kinetic processes

Pseudomonas alcaliphila NEWG-2 as biosorbent agent for methylene blue dye: optimization, equilibrium isotherms, and kinetic processes

Adsorption of Cr6+ ion using activated Pisum sativum peels-triethylenetetramine

The Flory–Huggins Isotherm and Water Contaminant Adsorption: Debunking Some Modeling Fallacies

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