Sodium adsorption isotherms

The effect of using the sodium adsorption isotherm (equation 6) to determine the apparent diffusion coefficient can be seen by... 

Fig. XI-13. Adsorption isotherms for SNBS (sodium p-3-nonylbenzene sulfonate) (pH 4.1) and DPC (dodecyl pyridinium chloride) (pH 8.0) on mtile at approximately the same surface potential and NaCl concentration of O.OlAf showing the four regimes of surfactant adsorption behavior, from Ref. 175. [Reprinted with permission from Luuk K. Koopal, Ellen M. Lee, and Marcel R. Bohmer, J. Colloid Interface Science, 170, 85-97 (1995). Copyright Academic Press.]...

Fig. XIII-15. Adsorption isotherm for sodium dodecylbenzenesulfonate on cotton. Curve I, 30°C curve II, 0°C. (From Ref. 64.)...

The adsorption behavior of homologous sodium alcohol sulfates at the interface can be characterized by the adsorption isotherms. However, the adsorption parameters of these isotherms are very sensitive to impurities present in the surfactant. Wiinstneck et al. [145] determined the equilibrium values of... 

Etaulsifier Oiaracteristics. Tlie values for CHC , adsorption isotherm parameters and micellar specific surface for sodium lauryl sulitoate as previously reported ( ) have heen usea... 

Typical examples of adsorption isotherms of sodium dodecyl sulfate onto different surfaces are shown in Fig. 4.2 [41]. Fig. 4.2 also demonstrates the effect of the... 

The adsorption isotherm of sodium dodecyl sulfate (SDS) on alumina at pH = 6.5 in 0.1 M NaCI (Fig. 4.11a) is characteristic of anionic surfactant adsorption onto a positively charged oxide. As shown by Somasundaran and Fuerstenau (1966) and by Chandar et al. (1987), the isotherm can be divided into four regions. These authors give the following explanation for the adsorption mechanism ... 

Figure 5.27 presents the adsorption isotherms of 2,3-dihydroxyl propyl dithiocarbonic sodium (GX2) on marmatite, arsenopyrite and pyrrhotite. The adsorption of GX2 on these three zinc-iron sulphides is increased with its... 

Daniels, R.B. Gamble, E.E. Buol, S.W. Bailey, H.H. (1975) Free iron sources in a aquult-udult sequence from North Carolina. Soil Sci. Soc. Am. Proc. 39 335-340 Danielsson, L.-G. Dyrssen, D. Graneli, A. (1980) Chemical investigations of Atlantis II and discovery brines in the Red Sea. Geo-chim. Cosmochim. Acta 44 2051-2065 Dao, K. Bee, A. Treiner, C. (1998) Adsorption isotherm of sodium octylbenzenesulfonate on iron oxide particles in aqueous solutions. 

These figures are in approximate agreement with values calculated -with the aid of the Freundlich adsorption isotherm (see p. 134) but no definite conclusions may be drawn from them since the actual area of liquid-liquid interface in all probability was variable being dependent on the amount of emulsifying agent present. More recently the quantity of various soaps required to form a stable emulsion of kerosene in water has been determined by Grifiin (J.A.C.8. XLV. 1648, 1923) for sodium oleate, potassium stearate and potassium palmitate and by der Meulen and Riemann ibid. XLVI. 876, 1924) for sodium ricinoleate. 

A well-studied and often-cited adsorption isotherm of an ionic surfactant is that of sodium dodecylsulfate at the alumina-water interface at pH 6.5 and 0.1 M NaCl. At pH 6.5 and 0.1 M NaCl the S-F isotherm [23]... 

Figure 1.2 Water adsorption isotherms at 25°C for Celite and preparations obtained by mixing Celite with different solutions (l.OmLg 1 Celite) and drying. Pure Celite ( ) Celite and a-chymotrypsin in water (4.0mgmD )(D) Celite and a-chymotrysin (4.0mgmL l) in 50mM sodium phosphate buffer, pH 7.8 (O). Reprinted from Ref. [18].

A scintillation counter is used to measure tritium /3 particles adjacent to the surfaces of tritiated sodium dodecyl sulfate in 0.115 M aqueous NaCl solution and tritiated dodeca-nol in dodecanol. The former system is surface active and the latter is not, so the difference between the measured radioactivity above the two indicates the surface excess of sodium dodecyl sulfate. The number of counts per minute arising from the surface excess As is related to the surface excess in moles per square centimeter r by the relationship As = 4.7 x 1012 T1. Use the following data (25°C) to construct the adsorption isotherm for sodium dodecyl sulfate on 0.115 M NaCl ... 

Figure 11.13 Adsorption isotherms for a series of alkyl ammonium compounds on sodium montmoril-lonite (adapted from Cowan and White. 1958). The horizontal dashed line indicates the cation exchange capacity of the clay.

Figurel. Nitrogen adsorption isotherms (A) and pore size distributions (B) of samples synthesized with different silica source, a TMOS, pH = 10, b TMOS, pH =2 and c sodium silicate, pH = 10...

The nature of adsorption of Group I ions on the oxide is illustrated in Figure 1 in which the adsorption isotherms for potassium ions on Mn02 are given as a function of pH. Similar behavior was observed for the adsorption of sodium ions. 

Figure 7. Experimental adsorption isotherm of sodium beta-naphthalenesulfonate on graphitized Sterling FT, A, and the corresponding calculated potential isotherm, B...

Figure 1. The electrophoretic behavior and isotherm for the adsorption of sodium dodecyl sulfonate from aqueous solution at pH 7.2, 25°C., and 2 X 10 3M ionic strength (NaCl). The 95% confidence limits for the three straight-line regions of the adsorption isotherm are shown...

Figure 10. Adsorption isotherms for surfactants on a PTFE latex at 25°C (-%-) ammonium perfluoro-octanoate at pH 6.0 in 10 3 mol dm"3 ammonium nitrate (-O-) sodium dodecanoate at pH 9.0 in 10 3 mol dm"3 sodium nitrate.

Figure 1. Adsorption isotherms of NaLS and Aerosol A-102 surfactants at 85/15 VA /BA latex /water interface (17) ((O) sodium lauryl sulfate (A) Aerosol A-102)...

Experimental studies of the partitioning of sodium into aragonite, calcite, and dolomite have been carried out by White (1977, 1978), who concluded that the mode of substitution was as Na2CC>3 rather than as Na bicarbonate or hydroxide. The behavior of Na+ does not follow that normally described by a simple partition coefficient, but rather coprecipitation is better described by a Freundlich-type adsorption isotherm equation, implying that adsorption is important. 

Figure 2. Adsorption isotherm of argon on sodium bromide at 77.5° K...

Ross and Boyd (II) prepared crystals of sodium chloride in which both the 100 and the HI surfaces were developed the adsorption isotherm of ethane at 90.1° K gave evidence of two type 2—i.e., near-homotattic—surfaces, as well as showing the initial knee, which is evidence of a type 1 surface. This isotherm is shown in Figure 4, which also includes for comparison an ethane isotherm measured at the same temperature for a sodium chloride adsorbent that had only 100 faces developed the pressure characteristic of the phase transition of ethane on the homotattic 190 surface of sodium chloride at 90.1° K shows on both isotherms as the location of a discontinuity at p = 4.5 X 10-3 mm. the homotattic ill portion of the surface is responsible for the convex shape (with respect to the pressure axis) of the isotherm beyond the knee, though the rise is not suffi-... 

Figure 4. Adsorption isotherm of ethane on sodium chloride at 90.1 ° K...

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