The Adsorption of Multinuclear Phenolic Compounds on Activated Carbon

Dargaville, Tim R.; Guerzoni, Felix N.; Looney, Mark G.; Solomon, David H.

doi:10.1006/jcis.1996.0432

Cited by 35 publications

(20 citation statements)

References 4 publications

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“…The values of SSA, the micropore volume and total volume were calculated using the isotherm data as described earlier and were 493 m 2 g −1 , 0.32 mL g −1 and 0.46 mL g −1 respectively. Boehm titrations (Dargaville et al 1996) were performed to determine the amount of carboxyl, phenolic, total acid and total basic groups in the activated carbon and were found to be 0.12, 0.05, 0.31 and 0.27 meq g −1 respectively.…”

Section: Resultsmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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Coir pith obtained from the coir industry as waste biomass was used to prepare activated carbon by chemical activation using phosphoric acid (H 3 PO 4 ). The influences of activation temperature and lasting time of activation on specific surface areas (SSA) of the activated carbons were observed. Physical characteristics of the activated carbon were investigated using X-ray diffraction (XRD), infrared spectroscopy (IR), surface area analyzer, scanning electron microscopy (SEM), thermal analysis and potentiometric titration. The feasibility of using activated carbon for the removal of phenol (P), p-chlorophenol (PCP) and pnitrophenol (PNP) from water and petroleum refinery industry effluents was investigated. The effects of contact time, adsorbent dose, ionic strength and initial concentration on the adsorption of phenols onto the activated carbon were investigated. The optimum pH for the maximum removal of phenols was 6.0. The equilibrium adsorption data of phenols were correlated to Langmuir and Freundlich isotherm models, the latter being the best fit of the experimental data. Dynamics of the sorption process and mass transfer were investigated using McKay and Urano-Tachikawa models. Adsorption kinetic data fits the Urano-Tachikawa kinetic model. The utility of the adsorbent was tested by using petroleum refinery industry effluent. The adsorbed phenols can be recovered by treatment with 0.1 M NaOH solution.

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Section: Resultsmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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“…Dargaville et al found up to a 100 mol/g adsorption capacity for multinuclear phenolic compounds by activated carbon. 8 Shu et al used aluminosilicate-based microporous materials (pillared clays, silicalite, and zeolite ␤), and they reported selective nitrophenol adsorption capacities up to 0.45 mmol/g. 9 Streat and Sweetland reported up to a 1.5 mmol/g adsorption capacity for phenol and chlorophenols with a new series of hypercrosslinked porous polymeric ion-exchange sorbents (Hypersol-Macronet TM ).…”

Section: Effects Of Initial Concentration Of Phenol and Nitrophenolsmentioning

confidence: 99%

“…6 Nonspecific adsorbents such as activated carbon, metal oxides, silica, and ion-exchange resins have been used. [7][8][9] However, specific adsorbents have recently been considered as one of the most promising techniques. 10 Specific adsorbents consist of a ligand (e.g., ion-exchange material) that specifically interacts with the organic and inorganic pollutants and a carrier matrix that may be an inorganic material (e.g., aluminum oxide, silica, or glass) or polymer microbeads [e.g., polystyrene, starch, chitosan, cellulose, poly(maleic anhydride), or poly(methyl methacrylate)].…”

Section: Introductionmentioning

confidence: 99%

Dye‐affinity microbeads for removal of phenols and nitrophenols from aquatic systems

Deni̇zli̇

Ökan

Uçar

2002

J of Applied Polymer Sci

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Alkali Blue 6B attached poly(2-hydroxyethyl methacrylate) (PHEMA) microbeads were investigated as dye-affinity adsorbents for the removal of phenol and nitrophenols (i.e., 2-nitrophenol, 4-nitrophenol, and 2,4-dinitrophenol) from aqueous solutions. PHEMA microbeads were prepared by radical-suspension polymerization of HEMA in the presence of azobisisobutyronitrile as the initiator. These microbeads with a swelling ratio of 55% and carrying 23.6 mol Alkali Blue 6B/g polymer were then used in the removal of phenol and nitrophenols from aqueous media. The adsorption was fast in all cases (20-min equilibrium time). The maximum adsorptions of phenols onto the microbeads carrying Alkali Blue 6B were 145.2 mol/g for phenol, 87.8 mol/g for 2,4-dinitrophenol, 112.6 mol/g for 4-nitrophenol, and 104.3 mol/g for 2-nitrophenol. The affinity order was phenol Ͼ 4-nitrophenol Ͼ 2-nitrophenol Ͼ 2,4-dinitrophenol. The adsorption of nitrophenols decreased with increasing pH. Desorption of nitrophenols was achieved using a 30% (v/v) methanol solution. The microbeads carrying Alkali Blue 6B are suitable for repeated use for more than five cycles without a noticeable loss of adsorption capacity.

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“…The existence of intermediate plateaus was observed during the adsorption of phenol in activated charcoal, and appears more clearly for oxidized samples. On the other hand, different factors influence adsorption, among them the molecular weight of the phenolic compounds and the position of substituents, which contribute to the p electron delocalization over the ring (Dargaville, Guerzoni, Looney, & Solomon, 1996) and to hydrophobicity, since the adsorption capacity increases with decreased water solubility of the phenolic compounds (Dąbrowski et al, 2005). Some authors suggested that the adsorption of phenol on microporous carbons is a micropore-filling process, whereas other stated that phenol adsorption is limited by the micropore volume of the carbons, and determined by their acid-basic characteristics.…”

Section: Adsorption Isothermsmentioning

confidence: 99%