Adsorption of organic compounds on porous carbon sorbents

El'tekova, N. A.; Berek, Dušan; Novak, I. I.; Belliardo, Flavio

doi:10.1016/s0008-6223(99)00113-x

Cited by 37 publications

(10 citation statements)

References 13 publications

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“…In an unconstrained body, shrinkage reduces area, but within a fixed template the effect of local shrinkage depends on curvatures leading either to a decrease in area (convex surfaces as in a spherical solid grain), or an increase in area (concave surfaces, as in a spherical pore). The complex pore shapes in this study should exhibit both types of curvature, so we assume that area is approximately independent of local shrinkage, and based on the negative replica concept that the absorption surface area of the two phases (carbon/inorganic) is identical but their masses are different, leading to the following geometric relation we derived for carbon area: (1) where (A/m) c is the total carbon area per unit mass, (A/m) t is the total template area per unit mass, V pores,t is the total pore volume of the template per unit mass, ρ p = 1.23 gm/cm 3 , which is the typical density of AR mesophase pitch, and Y= 85 wt-%, which is the bulk carbon yield for AR. The predicted values are shown in Table 1 and Figure 6.…”

Section: Morphology Pore Structure and Crystal Structure Of Mesopormentioning

confidence: 99%

Mesoporous carbons with self-assembled surfaces of defined crystal orientation

Jian

Truong

Hoffman

et al. 2008

Microporous and Mesoporous Materials

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The design of carbon sorbents traditionally focuses on the control of pore structure and the number and type of surface functional groups. The present paper explores the potential of also controlling the carbon crystal structure, or graphene layer orientation, in the immediate vicinity of the internal surfaces. We hypothesize that this crystal structure influences the properties of the carbon surfaces and affects the number and type of active sites for functionalization. Here a series of mesoporous carbons are fabricated by capillary infiltration of mesophase pitch (naphthalene homopolymer) into a series of controlled pore glass templates of different characteristic pore size followed by carbonization and template etching. The liquid crystalline mesogens are known to adopt perpendicular alignment (anchoring) at liquid/silica interfaces, which after carbonization lead to a high concentration of graphene edge sites at the inner surfaces. These surfaces are shown to have elevated chemical reactivity, and the pore structures are shown to be consistent with predictions of a quantitative model based on the negative replica concept. Overall, the use of mesophase pitch for templated mesoporous carbons allows systematic and simultaneous control of both pore structure and interfacial crystal structure through the well-defined rules of liquid crystal surface anchoring.

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Section: Morphology Pore Structure and Crystal Structure Of Mesopormentioning

confidence: 99%

Mesoporous carbons with self-assembled surfaces of defined crystal orientation

Jian

Truong

Hoffman

et al. 2008

Microporous and Mesoporous Materials

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“…Many researchers have shown that activated carbon is an effective adsorbent for treating water with high concentrations of organic compounds (Eltekova et al, 2000;Syafalni et al, 2012b). Its usefulness derives mainly from its large micropore and mesopore volumes and the resulting high surface area (Fu & Wang, 2011).…”

Section: Introductionmentioning

confidence: 99%

Peat Water Treatment Using Combination of Cationic Surfactant Modified Zeolite, Granular Activated Carbon, and Limestone

Syafalni¹,

Abustan²,

Brahmana³

et al. 2013

MAS

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This research was conducted essentially to treat fresh peat water using a series of adsorbents. Initially, the characterization of peat water was determined and five parameters, including pH, colour, COD, turbidity, and iron ion exhibited values that exceeded the water standard limit. There were two factors influencing the adsorption capacity such as pH, and adsorbent dosages that were observed in the batch study. The results obtained indicated that the majority of the adsorbents were very efficient in removing colour, COD, turbidity at pH range 2-4 and Fe at pH range 6-8. The optimum dosage of cationic surfactant modified zeolite (CSMZ) was found around 2 g while granular activated carbon (GAC) was exhibited at 2.5 g. In column study, serial sequence of CSMZ, GAC, and limestone showed that the optimal reduction on the 48 hours treatment were found pH = 7.78, colour = 12 TCU, turbidity = 0.23 NTU, COD = 0 mg/L, and Fe= 0.11 mg/L. Freundlich isotherm model was obtained for the best description on the adsorption mechanisms of all adsorbents.

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“…Comparative characteristics of the retention of the test compounds at the surface of Silochrom S-80 [13], the PG-101 porous pyrocarbon [14], and mesoporous cellulose are given in Table 3. Apart from the ä ç val- ELTEKOVA, ELTEKOV ues, the retention of the test compounds was characterized by the partition coefficient ä  of arene molecules between the adsorbent and the bulk phase and the Gibbs energy change ∆ F in the adsorption:…”

Section: Resultsmentioning

confidence: 99%

10.1007/s11124-008-2012-8

2000

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Competitive adsorption of anisole, benzaldehyde, benzoic acid, benzene, toluene, and phenol from dilute solutions in n -heptane at three chemically different porous adsorbents was studied by high-performance liquid chromatography (HPLC). The retention times of these compounds were used to calculate the equilibrium constants of the adsorption isotherms, the partition coefficients, and the Gibbs energy changes. The results obtained made it possible to estimate the Gibbs energy changes in the competitive adsorption of arenes leading to the formation of supramolecular surface compounds at cellulose and silica and the formation of arene clusters at the pyrocarbon surface from dilute solutions in n -heptane.

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Adsorption of organic compounds on porous carbon sorbents

Cited by 37 publications

References 13 publications

Mesoporous carbons with self-assembled surfaces of defined crystal orientation

Mesoporous carbons with self-assembled surfaces of defined crystal orientation

Peat Water Treatment Using Combination of Cationic Surfactant Modified Zeolite, Granular Activated Carbon, and Limestone

10.1007/s11124-008-2012-8

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