Adsorption of p-Cresol by Mesoporous Activated Carbon. II. Mechanism studies and data modeling

Neagu, Mircea; Popovici, Daniela Roxana; Vîjan, Loredana Elena; Călin, Cătalina

doi:10.37358/rc.17.3.5486

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…where q max (mg/g) and K L (L/mg) are Langmuir constants related to the adsorption capacity and energy of adsorption [9,10]. K L is the adsorption equilibrium constant in L/mg related to the apparent energy of adsorption, and q e is the amount adsorbed on the unit mass of the adsorbent (mg/ g) when the equilibrium concentration is C e (mg/L).…”

Section: Langmuir Isothermmentioning

confidence: 99%

Kinetic Adsorption of Humic Acids Mixture Obtained from Microalgae on Exfoliated Graphite Nanoplatelets

Radu¹,

Oprescu²,

Enăşcuţă³

et al. 2018

Rev. Chim.

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The dehydration of polysaccharides fraction in the presence of acid catalysts, is a chemical process in which results as secondary product humic matter. In our work, the humic acid mixture was for the first time based on our knowledge extracted from defatted microalgae biomass rich in polysaccharides by standard alkali treatment, followed by precipitation at acidic pH. The dried humic acid mixture has been characterized using infrared spectroscopic measurements (FT-IR). Exfoliated graphite nanoplatelets (xGnP) were used as new adsorbents for this type of humic acids mixture, their adsorption being investigated. The effect of several parameters such as: contact time, concentration of humic acid mixture, concentration of xGnP, temperature and pH of the solutions were studied. The process of adsorption took place with good results, in the following conditions: at a concentration of humic acid mixture of 18.6 mg L-1, an xGnP amount of 0.01 mg in 25 mL of solution, at a temperature of 25 �� and at acidic pH values, in aqueous solution.

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Section: Langmuir Isothermmentioning

confidence: 99%

Kinetic Adsorption of Humic Acids Mixture Obtained from Microalgae on Exfoliated Graphite Nanoplatelets

Radu¹,

Oprescu²,

Enăşcuţă³

et al. 2018

Rev. Chim.

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Adsorption of p-nitrophenol onto activated carbon prepared from fir sawdust: isotherm studies and error analysis

Popovici

Neagu

Dusescu-Vasile

et al. 2021

Reac Kinet Mech Cat

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Adsorption Equilibrium of 2,4 Dichlorophenol From Waste Waters Onto Activated Carbon

Neagu

2023

JPGT

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The batch adsorption of 2,4-dichlorophenol from aqueous solution onto mesoporous activated carbon was investigated for a range of initial concentrations of 50 to 1000 mg/ L, at constant temperature of 293 K. The experimental adsorption isotherms were analyzed with two and three parameters models (i.e., Freundlich, Langmuir, Langmuir-Freundlich, and Brouers-Sotolongo models). The non-linear fitting method was employed for estimating the isotherm parameters. The standard statistical tools were used to check the accuracy of the fit measure, namely: the coefficient of determination R2, the adjusted coefficient of determination Adj- R2, the residual sum of squares RSS (or chi-square function χ2), and reduced chi-square Red- χ2. The analysis of all the isotherms found that the Brouers-Sotolongo model shows higher correlation coefficients of R2 and Adj-R2 values and lower values of RSS and Red-χ2. Also, the Brouers-Sotolongo model shows a maximum adsorption capacity qm of 50.46 mg/g, which is very close to the experimental data (48.123 mg/g) value. The adsorption process was mainly physical adsorption on heterogeneous surfaces. The heterogeneous surface of activated carbon was confirmed by FT-IR analysis, the Boehm method, and pHPZC, as presented in our previous studies. The interactions between 2,4 DCP and GAC are mostly a type of dispersion effect between the π electrons in the aromatic ring of the phenolic compound and the π electrons in the structure of the GAC adsorbent. Also, electrostatic attractions may occur between the π electrons in the aromatic rings of 2,4 DCP and the positive surface of the GAC.

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Adsorption of p-Cresol by Mesoporous Activated Carbon. II. Mechanism studies and data modeling

Cited by 3 publications

References 18 publications

Kinetic Adsorption of Humic Acids Mixture Obtained from Microalgae on Exfoliated Graphite Nanoplatelets

Kinetic Adsorption of Humic Acids Mixture Obtained from Microalgae on Exfoliated Graphite Nanoplatelets

Adsorption of p-nitrophenol onto activated carbon prepared from fir sawdust: isotherm studies and error analysis

Adsorption Equilibrium of 2,4 Dichlorophenol From Waste Waters Onto Activated Carbon

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