Bestimmung der spezifischen Oberfläche hydrophiler Stoffe aus der Phenol‐Adsorption

Boehm, H. P.; Gromes, W.

doi:10.1002/ange.19590710205

Cited by 25 publications

(5 citation statements)

References 24 publications

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“…Adsorption Isotherms. The isotherms for all species had the same shape as demonstrated for the two species P. abies and A. alba (Figure 2A,B) and resembled BETtype isotherms (20)(21)(22). They can be interpreted as follows:…”

Section: Resultssupporting

confidence: 58%

“…A plot of the amount of PCP adsorbed (mol-mm"1) vs donor concentration (mol-m"3) resulted in an adsorption isotherm, which was characterized by a weakly pronounced plateau and a subsequent multilayer adsorption. Adsorption of molecules from aqueous solution on solid surfaces can be described by the BET isotherm equation (20)(21)(22):…”

Section: Desorption Experiments Desorption Experimentsmentioning

confidence: 99%

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Uptake of organic chemicals in conifer needles: surface adsorption and permeability of cuticles

Schreiber¹,

Schoenherr²

1992

Environ. Sci. Technol.

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Section: Resultssupporting

confidence: 58%

Section: Desorption Experiments Desorption Experimentsmentioning

confidence: 99%

Uptake of organic chemicals in conifer needles: surface adsorption and permeability of cuticles

Schreiber¹,

Schoenherr²

1992

Environ. Sci. Technol.

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“…Furthermore, there are also some discrepancies about the value of the cross-sectional area of the phenol molecule when it is adsorbed in a flat position. Thus, Teng et al used a value of 30.2 × 10 -20 m 2 , Boehm et al 40 × 10 -20 m 2 , Coughlin et al 41.2 × 10 -20 m 2 , and Singh 52.2 × 10 -20 m 2 . Recently, Lyklema used a cross-sectional area of 45 × 10 -20 m 2 , and with this value, he found an area of 380 m 2 for a carbon with a BET ( N 2 ) area of about 1000 m 2 , indicating that this is still so high as to suggest contributions from pores.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Phenolic Compounds from Aqueous Solutions, by Activated Carbons, Described by the Dubinin−Astakhov Equation

2001

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It is shown that the adsorption of phenol and 3-chlorophenol from aqueous solutions, by basic active carbons and at an equilibrium solution pH below that of dissociation of the phenols, can be described by an equation of the DRK type with exponent n ) 4. The principle of temperature invariance is fulfilled between 283 and 313 K, which means that predictions can be made on the basis of a characteristic energy, Es, and of affinity coefficients, βs, relative to phenol. This approach presents an advantage over the traditional Langmuir isotherm. Moreover, the comparison of the limiting amounts adsorbed by the different carbons suggests that phenol and 3-chlorophenol are adsorbed in a monolayer as observed for carbon blacks, except in the case of activated carbons with a low degree of activation in which molecular-sieve effects can take place. Similar conclusions are obtained from the enthalpies of immersion into the aqueous solutions and their comparison with graphitized carbon blacks.

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“…The general advantage of equation 3 compared to equation 1 is the fact that it is solved for the monolayer capacity .Y^, which principally allows the determination of effective leaf surface areas from one single adsorption experiment, provided that the BET-constant B, characterizing the energetic interactions between the surface and the adsorbing molecule (Boehm & Gromes, 1959), is known a priori. Since the BET-adsorption isotherms obtained with leaf surfaces were always measured using the same molecule (PCP) and the same solvent (water) the BET-constant B is solely dependent on the physicochemical properties of the investigated leaf surface.…”

Section: Determination Of Effective Leaf Surface Areasmentioning

confidence: 99%

“…(2) equation 2 follows the general form of the linear equation: >' = a-\-bx. Plotting vs. reduced concentrations r/Cj, in the range between 0-01 to about 0-3 (Boehm & Gromes, 1959), a linearization of the BET-isotherms can be obtained (Eig. 3).…”

Section: Determination Of Effective Leaf Surface Areasmentioning

confidence: 99%

Comparative investigations of cuticular permeability of conifer needles from healthy and damaged trees

Schreiber

1994

New Phytologist

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Using pentachlorophenol (PCP) and conifer needles, rates of cutitular PCP uptake and effective leaf surface areas were measured, and PCP permeances of the cuticular membranes were calculated. Needles from healthy and damaged conifer trees of the species Picea abies (L.) Karst., Pinus sylvetris L. and Abies alba Mill, were investigated. Significant differences of the rates of cuticular uptake, effective leaf surface areas and permeances of the cuticular membranes between healthy and damaged trees were not evident. Thus, it must be concluded tbat damaged cuticular tran.sport barriers of tht needles cannot have contributed to the damage symptoms obseried with the trees investigated in tbis study. However, it was found that increasingly older spruce needles bad significantly higher permeances, indicating a decrease of cuticular barrier properties with needle age. Additionally, due to larger effective leaf surfaces spruce needles of higher altitudes (1100 m above sea level) possessed bigher rates of cuticular transport compared to needles from lower altitudes (400 m above sea-level). Therefore, these findings might help to understand why older needles and trees growing in bigber geographical sites are more sensitive to detrimental en\ ironmentaf influences causing symptoms of novel forest decline.

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Bestimmung der spezifischen Oberfläche hydrophiler Stoffe aus der Phenol‐Adsorption

Abstract: AurwertungFolgende Gleichgewichte sind bei niedrigen Deuterium-Gehalten zu beriicksichtigen (f = fliissig, g = gas):(1)

Cited by 25 publications

References 24 publications

Uptake of organic chemicals in conifer needles: surface adsorption and permeability of cuticles

Uptake of organic chemicals in conifer needles: surface adsorption and permeability of cuticles

Adsorption of Phenolic Compounds from Aqueous Solutions, by Activated Carbons, Described by the Dubinin−Astakhov Equation

Comparative investigations of cuticular permeability of conifer needles from healthy and damaged trees

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