Adsorption of p-nitrophenol on an activated carbon with different oxidations

Haydar, S.; Ferro-Garcı́a, M.A.; Rivera‐Utrilla, J.; Joly, Jean‐Pierre

doi:10.1016/s0008-6223(02)00344-5

Cited by 175 publications

(103 citation statements)

References 21 publications

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“…On the other hand, it is interesting to remark that despite their moderate porosity development, activated carbons prepared from mixtures of furfural and coal tar pitch, present adequate adsorption capacities towards MAP and PNP, comparable to those reported in the literature for activated carbons with higher surface areas [25][26][27].…”

Section: Adsorption From Solutionsupporting

confidence: 75%

Activated carbon from coal tar pitch and furfural for the removal of p-nitrophenol and m-aminophenol

Petrová

Tsyntsarski

Budinova

et al. 2011

Chemical Engineering Journal

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Adsorption of m-aminophenol and p-nitrophenol from aqueous solution on activated carbon synthesized on the base of industrial by product (coal tar pitch) and furfural was investigated.The adsorption capacity of the activated carbon and its oxidized modification is related to the surface area and composition of the prepared materials, as well as to the nature of the adsorbents. Despite the moderate porosity, the prepared materials display adequate adsorption capacity towards the investigated aromatic compounds. Both adsorbates show higher affinity towards the hydrophobic carbon, confirming that the retention mechanism occurs via nonspecific interactions between the electronic density of the adsorbent and the aromatic pollutants. Electrostatic interactions may also appear depending on the solution pH and the charge distribution of the carbons; we have observed that this parameter has a strong influence on the final performance of the oxidized carbon, where repulsive interactions that reduced the uptake of the carbon were found to appear within a larger pH range.

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Section: Adsorption From Solutionsupporting

confidence: 75%

Activated carbon from coal tar pitch and furfural for the removal of p-nitrophenol and m-aminophenol

Petrová

Tsyntsarski

Budinova

et al. 2011

Chemical Engineering Journal

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“…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]. However, in this study, the π-π donoracceptor complex mechanism was proposed to better explain the observed results [7].…”

Section: Sorption Kinetics Of Nacsmentioning

confidence: 99%

“…One such specific interaction is the formation of hydrogen bonds and pNP is the only dissociable compound among the four NACs studied that has a hydroxy functional group (-OH) capable of forming H-bonds with the surface oxygen groups of the MWCNTs. Some authors have also identified the existence of H-bonds between the phenol and carboxyl groups of activated carbon, although water can compete with phenol [14,34]. It is well known that adsorption of phenolic compounds to carbon materials is partly physical and partly chemical [11].…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…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]. For the sorption of nitrobenzene onto activated carbon, which is undissociated in solution, the dispersive interactions will be the most important mechanism in the sorption process [15].…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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“…In literatures, there are many reports about adsorption properties of activated carbon, which include the adsorptions of many compounds and metals, such as methyl tertiary-butyl ether, trichloroethene [5], resorcinol ,catechol [6], mercury [7,8], phenanthrene [9], p-nitrophenol [10], naphthalenesulphonic acids [11], aromatics [12], Hg-Ni-Cd metal ions [13] etc. However the report about de-sorption of activated carbon is less [14].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

Zhang¹,

Zhang²,

Huang³

2012

J Environment Analytic Toxicol

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Adsorption of p-nitrophenol on an activated carbon with different oxidations

Cited by 175 publications

References 21 publications

Activated carbon from coal tar pitch and furfural for the removal of p-nitrophenol and m-aminophenol

Activated carbon from coal tar pitch and furfural for the removal of p-nitrophenol and m-aminophenol

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

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

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