Preparation and Modification of Activated Carbon Surface and Functions for Environments

Machida, Motoi; Amano, Yoshimasa

doi:10.1007/698_2020_673

Cited by 2 publications

(3 citation statements)

References 62 publications

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“…The interactions Cπ-Me n+ (cation) are attributed to electrostatic interactions between the aromatic rings of carbonaceous adsorbents (with the basic surface) and metal cations. On the activated carbon surface, according to some authors, the π (Cπ) electrons possess weak negative charge properties [76]. The positions with Cπ electronic density could correspond to the basic functional groups determined via the Boehm method (chromene, ketones and pyrones structures) [76].…”

Section: The Suggested Mechanisms For the Adsorption Of Co(ii)/sr(ii)...mentioning

confidence: 99%

“…On the activated carbon surface, according to some authors, the π (Cπ) electrons possess weak negative charge properties [76]. The positions with Cπ electronic density could correspond to the basic functional groups determined via the Boehm method (chromene, ketones and pyrones structures) [76].…”

Section: The Suggested Mechanisms For the Adsorption Of Co(ii)/sr(ii)...mentioning

confidence: 99%

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Adsorption of Cobalt and Strontium Ions on Plant-Derived Activated Carbons: The Suggested Mechanisms

Ceban

Lupaşcu

Mikhalovsky

et al. 2023

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In this study, activated carbons derived from walnut shells (CA-N) and apple wood (CA-M) were used as adsorbents to remove cobalt(II) and strontium(II) ions from aqueous solutions. The novel materials were obtained using nitric acid (CA-Mox) and nitric acid/urea mixture (CA-Mox-u, CA-Nox-u) as oxidizing agents. The physical–chemical characteristics of activated carbons were determined from nitrogen sorption isotherms, SEM-EDX, FTIR, pH metric titrations, the Boehm titration method and elemental analysis. The results of batch experiments indicate that maximum adsorption can be achieved in broad pH ranges: 4–8 for Co(II) and 4–10 for Sr(II). The maximum adsorption capacities of Co(II) and Sr(II) on oxidized activated carbons at pH = 4 are: CA-Mox, 0.085 and 0.076 mmol/g; CA-Mox-u, 0.056 and 0.041 mmol/g; and CA-Nox-u, 0.041 and 0.034 mmol/g, respectively. The mathematical models (pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models, and Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin–Pyzhev isotherm models) were used to explain the adsorption kinetics, to study the adsorption mechanism and predict maximum adsorption capacity of the adsorbents. The adsorption mechanisms of toxic metal ions on activated carbons were proposed.

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Section: The Suggested Mechanisms For the Adsorption Of Co(ii)/sr(ii)...mentioning

confidence: 99%

Section: The Suggested Mechanisms For the Adsorption Of Co(ii)/sr(ii)...mentioning

confidence: 99%

Adsorption of Cobalt and Strontium Ions on Plant-Derived Activated Carbons: The Suggested Mechanisms

Ceban

Lupaşcu

Mikhalovsky

et al. 2023

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show abstract

“…On the surface of initial activated carbons, with a weak basic surface, there are few hydroxyl groups from alcohols and phenols, while on the surface of oxidized activated carbons there are more hydroxyl groups from alcohols, phenols and carboxylic acidic. In the basic domain, OHions are competitive with the nitrite ions, the graphitic surface of activated carbon becomes negatively charged and, consequently, rejects the nitrite ions [2].…”

Section: Some Considerations Of Nitrite Ions Adsorption On Activated ...mentioning

confidence: 99%

Some considerations of nitrite ions adsorption on activated carbons. The suggested mechanisms

Ceban¹,

Nastas²

2022

Scientific Seminar "Ecological Chemistry Ensures a Healthy Environment"

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Preparation and Modification of Activated Carbon Surface and Functions for Environments

Cited by 2 publications

References 62 publications

Adsorption of Cobalt and Strontium Ions on Plant-Derived Activated Carbons: The Suggested Mechanisms

Adsorption of Cobalt and Strontium Ions on Plant-Derived Activated Carbons: The Suggested Mechanisms

Some considerations of nitrite ions adsorption on activated carbons. The suggested mechanisms

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