Role of surface acidity in the adsorption of organic pollutants on the surface of carbon

Coughlin, Robert W.; Ezra, F. S.

doi:10.1021/es60016a002

Cited by 530 publications

(249 citation statements)

References 15 publications

(23 reference statements)

Supporting

Mentioning

225

Contrasting

Unclassified

Order By: Relevance

“…Langmuir and Freundlich models fit the sorption isotherms well (Table 4), and the values of 1/n were generally lower than 0.5 (Table 4), consistent with the adsorption onto other carbon materials such as activated carbon [27,28] and black carbon [29,30]. Three main mechanisms have been proposed for the sorption of nondissociable aromatic compounds onto carbon materials, (1) π-π dispersion interaction, (2) hydrogen bonding [12], and (3) electron donor-acceptor complex formation [13]. Of the three proposed mechanisms, π-π dispersion interaction is the most widely accepted mechanism for the adsorption of aromatic compounds on activated carbon [11,14].…”

Section: Sorption Kinetics Of Nacssupporting

confidence: 67%

“…Sorption properties of NACs on activated carbon have been studied for many years and involve electrostatic and dispersive interactions between the adsorbate and the activated carbon [10,11]. Electrostatic interactions dominate when the adsorbate is dissociated under the experimental conditions, while three mecha- nisms are proposed for nonelectrostatic interactions, (1) π-π dispersion interaction, (2) hydrogen bonding [12], and (3) electron donor-acceptor complex formation [13]. Of theses the π-π dispersion interaction mechanism is the most widely accepted [11,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes

Shen

Shan

Dong

et al. 2009

Journal of Colloid and Interface Science

154

View full text Add to dashboard Cite

The sorption kinetics and thermodynamics of 1,3-dinitrobenzene (DNB), m-nitrotoluene (mNT), p-nitrophenol (pNP), and nitrobenzene (NB) on as-grown and nitric acid-oxidized multiwalled carbon nanotubes (MWCNTs) were investigated. The sorption kinetics was well described by a pseudo-second-order rate model, while both Langmuir and Freundlich models described the sorption isotherms well and the sorption thermodynamic parameters of equilibrium constant (K 0 ), standard free energy ( G), standard enthalpy ( H), and standard entropy changes ( S) were measured. The values of H and G suggested that the sorption of nitroaromatics (NACs) onto MWCNTs was exothermic and spontaneous. The structure, number, and position of nitro groups of NACs were the main factors affecting the sorption rate and capacity. Treatment of the MWCNTs with nitric acid increased both the surface area and the pore volume and introduced oxygen-containing functional groups to the MWCNTs, which depressed the sorption of NACs onto MWCNTs.

show abstract

Section: Sorption Kinetics Of Nacssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes

Shen

Shan

Dong

et al. 2009

Journal of Colloid and Interface Science

154

View full text Add to dashboard Cite

show abstract

“…1). The functional groups most often suggested are carboxyl groups, phenolic hydroxyl groups, and quinone carbonyl groups [6][7][8][9][10]. Less often suggested are ether, peroxide, and ester groups in the forms of normal and fluorescein-like lactones [11], carboxylic acid anhydrides [12], and cyclic peroxide [13].…”

Section: Surface Complexesmentioning

confidence: 99%

Chemical and Catalytic Properties of Elemental Carbon

et al. 1982

View full text Add to dashboard Cite

“…6). When the solution pH was close to the pH pzc , the surface electrostatic on ACs was zero, and phenol remained in molecular forms (pH<9), the ʌ-ʌ dispersion interaction strengthened [24], which leaded to the best adsorption capacity of AC and MAC. When the solution pH<pH pzc , the charge of activated carbon was positive, the dispersion interaction between the activated carbons and the phenol molecular was reduced, then the adsorption capacity was decreased.…”

Section: Langmuir Linear Equationmentioning

confidence: 99%

The Adsorption Mechanism of Modified Activated Carbon on Phenol

et al. 2016

View full text Add to dashboard Cite

Abstract. Modified activated carbon was prepared by thermal treatment at high temperature under nitrogen flow. The surface properties of the activated carbon were characterized by Boehm titration, BET and point of zero charge determination. The adsorption mechanism of phenol on modified activated carbon was explained and the adsorption capacity of modified activated carbon for phenol when compared to plain activated carbon was evaluated through the analysis of adsorption isotherms, thermodynamic and kinetic properties. Results shows that after modification the surface alkaline property and pHpzc value of the activated carbon increase and the surface oxygen-containing functional groups decrease. The adsorption processes of the plain and modified carbon fit with Langmuir isotherm equation well, and the maximum adsorption capacity increase from 123. 46, 111.11, 103.09mg/g to 192.31, 178.57, 163,93mg/g under 15, 25 and 35°C after modification, respectively. Thermodynamic parameters show that the adsorption of phenol on activated carbon is a spontaneously exothermic process of entropy reduction, implying that the adsorption is a physical adsorption. The adsorption of phenol on activated carbon follows the pseudo-second-order kinetics (R2>0.99). The optimum pH of adsorption is 6~8.

show abstract

Role of surface acidity in the adsorption of organic pollutants on the surface of carbon

Cited by 530 publications

References 15 publications

Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes

Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes

Chemical and Catalytic Properties of Elemental Carbon

The Adsorption Mechanism of Modified Activated Carbon on Phenol

Contact Info

Product

Resources

About