Adsorption of nitrogen and water vapour by activated Nomex® chars

Freeman, John J.; Tomlinson, John B.; Sing, K. S. W.; Theocharis, Charis R.

doi:10.1016/0008-6223(95)00005-x

Cited by 44 publications

(42 citation statements)

References 4 publications

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“…2) is of type I indicating the micropores. The isotherm is characterized of a molecular sieve material; that is, they possess a rectangular 'knee' indicative to the presence of wider micropores and negligible mesoporosity (Freeman et al 1995). 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.…”

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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“…The textural properties of ACFs obtained through physical activation with carbon dioxide and steam using several varieties of aramid fibers as feedstocks have already been reported in the literature (4)(5)(6)(7)(11)(12)(13). However, little attention has been paid to the analysis of their pore-size distribution.…”

Section: Introductionmentioning

confidence: 97%

“…Thus, Freeman et al (3,4) first reported on the outstanding homogeneity in pore size of ACFs prepared from highly ordered polymers, such as aramid fibers. Indeed, ACFs prepared from aramid show a narrower pore size distribution than those reported in the literature (5) for ACFs derived from more disordered precursors.…”

Section: Introductionmentioning

confidence: 98%

“…Nomex (poly(m-phenylene isophthalamide)) is a particularly attractive precursor for obtaining very selective adsorbents, as it has been proved to yield fibrous adsorbents, whose porosity covers a narrow range in relation to other aramid fibers, making them promising molecular sieves (4,7,14). As for the use of steam as activating agent, it has been suggested that its utilization instead of carbon dioxide in the activation process of aramid fibers does not lead to a significant widening of the pore sizes (4), unlike the case of other carbonaceous materials (15,16).…”

Section: Introductionmentioning

confidence: 99%

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Porous Texture Evolution in Nomex-Derived Activated Carbon Fibers

Villar–Rodil

Denoyel

Rouquérol

et al. 2002

Journal of Colloid and Interface Science

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In the present work, the textural evolution of a series of activated carbon fibers with increasing burn-off degree, prepared by the pyrolysis and steam activation of Nomex aramid fibers, is followed by measurements of physical adsorption of N(2) (77 K) and CO(2) (273 K) and immersion calorimetry into different liquids (dichloromethane, benzene, cyclohexane). The immersion calorimetry results are discussed in depth, paying special attention to the choice of the reference material. The activated carbon fibers studied possess an essentially homogeneous microporous texture, which suggests that these materials may be applied in gas separation, either directly or with additional CVD treatment.

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“…Nomex, or poly-(m-phenylene isophtalamide), is the polycondensation product of 1,3-diaminobenzene and terephthalic acid. Besides showing high carbonization yields (12), this polymeric material has proved to yield ACFs with very small and uniform pore sizes irrespective of the activation conditions (13)(14)(15)(16)(17)(18). For these features, Nomexbased ACFs have recently been suggested as promising precursors for CMSs (17,18).…”

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confidence: 98%

Carbon Molecular Sieves for Air Separation from Nomex Aramid Fibers

Villar–Rodil¹,

Martı́nez-Alonso²,

Tascón³

2002

Journal of Colloid and Interface Science

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Activated carbon fibers prepared from aramid fibers have proved to possess outstanding homogeneity in pore size, most of all when Nomex aramid fiber is used as precursor. Taking advantage of this feature, microporous carbon molecular sieves for air separation have been prepared through carbon vapor deposition of benzene on Nomex-derived carbon fibers activated to two different burnoff degrees. Carbon molecular sieves with good selectivity for this separation and showing acceptable adsorption capacities were obtained from ACFs activated to the two burnoff degrees chosen.

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Adsorption of nitrogen and water vapour by activated Nomex® chars

Cited by 44 publications

References 4 publications

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

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

Porous Texture Evolution in Nomex-Derived Activated Carbon Fibers

Carbon Molecular Sieves for Air Separation from Nomex Aramid Fibers

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