Reasonable calculation of the thermodynamic parameters from adsorption equilibrium constant

Chen, Tao; Da, Tianxing; Ma, Yan

doi:10.1016/j.molliq.2020.114980

Cited by 94 publications

(63 citation statements)

References 73 publications

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“…Overall CaAl, MgAl, Biochar, CaAl-Biochar, and MgAl-Biochar more likely to follow the Langmuir isotherm model because it has a linear regression value that is closer to 1. Langmuir isotherm model which assumes the adsorption sites are identical and that there are no interactions between adsorbed molecules (Chen et al, 2020). According to Onder et al (2020), the adsorption process that follows the Langmuir isotherm model tends to be chemisorption and the adsorption process occur in monolayer.…”

Section: Resultsmentioning

confidence: 99%

The Capability of Biochar-Based CaAl and MgAl Composite Materials as Adsorbent for Removal Cr(VI) in Aqueous Solution

Juleanti

Palapa

Taher

et al. 2021

sci. technol. indones.

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The development of layered double hydroxide materials into composites with carbon-based materials in the form of CaAl-Biochar and MgAl-Biochar has been successfully carried out. The success parameters of the preparation process include XRD, FT-IR, Adsorption-Desorption N2, SEM, and TG-DTA. The success through XRD is evidenced by the appearance of the typical diffraction peaks of double-layer hydroxy around 2???? = 11°(003), 20°(006), and 60°(113). In addition, there is diffraction around 22°(002) which is the typical diffraction of biochar. FT-IR analysis showed successful preparation in the presence of functional groups around 1381cm−1 which indicated nitrate vibrations from double-layer hydroxy. Another spectrum that also appears on 1103 cm−1 is a characteristic of biochar (???? Si-O-Si). Adsorption-Desorption N2 analysis showed that the surface area data of 2 −1 2 −1 CaAl-Biochar was greater than MgAl-Biochar, which were 150.987 m .g and 111,404 m .g , respectively. The adsorption capacity of CaAl-Biochar reached 588.235 mg.g−1 and 426.316 mg.g−1 for MgAl-Biochar. The adsorbent materials of CaAl, MgAl, Biochar, CaAl-Biochar, and MgAl-Biochar tend to follow the Langmuir isotherm model with adsorption processes that tend to be spontaneous. The results of regeneration of the composite material lasted up to 5 cycles. The first cycle of CaAl-Biochar reached 96.647% to 82.666% in the last cycle, while MgAl-Biochar reached 90.885% in the first cycle to 73.454% in the last cycle.

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Section: Resultsmentioning

confidence: 99%

The Capability of Biochar-Based CaAl and MgAl Composite Materials as Adsorbent for Removal Cr(VI) in Aqueous Solution

Juleanti

Palapa

Taher

et al. 2021

sci. technol. indones.

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“… 22 A recent publication reviews the topic in further details and summarizes mathematical approaches to transform the Langmuir constant into a dimensionless standard equilibrium constant compatible with eqn (4) . 23 …”

Section: Langmuir's Theorymentioning

confidence: 99%

“…Since the rate constants are connected by the linear function k obs = k ads C L + k des , the slope of the experimental k obs over C L plot provides the value of k ads while the intercept with the y -axis yields k des . Knowledge of the adsorption and desorption rate constants can be used to calculate the Langmuir equilibrium constant by means of the following equation: 23 …”

Section: Langmuir's Theorymentioning

confidence: 99%

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Solution NMR methods for structural and thermodynamic investigation of nanoparticle adsorption equilibria

Sedinkin

Venditti

2022

Nanoscale Adv.

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“…Gibbs free energy, enthalpy and entropy are state functions, so ΔG, ΔH and ΔS depend on the final state and the initial state of the adsorption system. Gibbs free energy, enthalpy and entropy have extensive property, so attention must be paid to the amount of substance that these thermodynamic parameters correspond to [ 226 ].…”

Section: Factors Affecting Adsorption Processmentioning

confidence: 99%

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

2021

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The primary, most obvious parameter indicating water quality is the color of the water. Not only can it be aesthetically disturbing, but it can also be an indicator of contamination. Clean, high-quality water is a valuable, essential asset. Of the available technologies for removing dyes, adsorption is the most used method due to its ease of use, cost-effectiveness, and high efficiency. The adsorption process is influenced by several parameters, which are the basis of all laboratories researching the optimum conditions. The main objective of this review is to provide up-to-date information on the most studied influencing factors. The effects of initial dye concentration, pH, adsorbent dosage, particle size and temperature are illustrated through examples from the last five years (2017–2021) of research. Moreover, general trends are drawn based on these findings. The removal time ranged from 5 min to 36 h (E = 100% was achieved within 5–60 min). In addition, nearly 80% efficiency can be achieved with just 0.05 g of adsorbent. It is important to reduce adsorbent particle size (with Φ decrease E = 8–99%). Among the dyes analyzed in this paper, Methylene Blue, Congo Red, Malachite Green, Crystal Violet were the most frequently studied. Our conclusions are based on previously published literature.

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Reasonable calculation of the thermodynamic parameters from adsorption equilibrium constant

Cited by 94 publications

References 73 publications

The Capability of Biochar-Based CaAl and MgAl Composite Materials as Adsorbent for Removal Cr(VI) in Aqueous Solution

The Capability of Biochar-Based CaAl and MgAl Composite Materials as Adsorbent for Removal Cr(VI) in Aqueous Solution

Solution NMR methods for structural and thermodynamic investigation of nanoparticle adsorption equilibria

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

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