Triton adsorption isotherms

The adsorption isotherms for each chemical, Triton X-100 or phenanthrene, on the activated carbons were shown in Figs. 1 and 2. The adsorption isotherms are expressed as qg [g g ], the amount of compounds adsorbed per unit mass of adsorbent, as a fimction of Q [g l ], the concentration in solution at equilibrium [5, 6]. The best-fit parameters for Freimdlich isotherms (g = or linear isotherms (q - Kj C ) were summarized in Table 2. The... 

Spans, Tritons, and Tweens are series of nonionic surfactants. Some of these products do not represent specific chemical compounds but rather mixtures of similar compounds having different number of ethylene oxide segments and/or different lengths of hydrocarbon chain, and the apparent adsorption isotherm is a result of interaction of particular components of the mixture in solution and on the surface. 

Figure 1. Apparent adsorption isotherms of Triton-X-100 in 0.55 mol dm-3 NaCl obtained with various accumulation times (I) 30, (2) 60, (3) 180, (4) 300s and theoretical Frumkin adsorption I. olhcrms of Trilon-X-lOO with interaction factors a - 1.0 (curve 5) and 1.25 (curve 6). Batina et al.,...

To illustrate the dependence of the mobility function d>y on the concentration of surfactant in the continuous phase, in Fig. 12 we present theoretical curves, calculated in Ref 138 for the nonionic surfactant Triton X-100, for the ionic surfactant SDS ( + 0.1 M NaCl) and for the protein bovine serum albumin (BSA). The parameter values, used to calculated the curves in Fig. 12, are listed in Table 4 and K are parameters of the Langmuir adsorption isotherm used to describe the dependence of surfactant adsorption, surface tension, and Gibbs elasticity on the surfactant concentration (see Tables 1 and 2). As before, we have used the approximation Dj Dj (surface diffusivity equal to the bulk dif-fusivity). The surfactant concentration in Fig. 12 is scaled with the reference concentration cq, which is also given in Table 4 for Triton X-100 and SDS + 0.1 M NaCl, cq is chosen to coincide with the cmc. The driving force, F, was taken to be the buoyancy force for dodecane drops in water. The surface force is identified with the van der Waals attraction the Hamaker function Ajj(A) was calculated by means of Eq. (86) (see below). The mean drop radius in Fig. 12 is a = 20 /pm. As seen in the figure, for such small drops 4>y = 1 for Triton X-100 and BSA, i.e., the drop sur-... 

Nevskaia. D.M, et al.. Interaction of Triton X-100 on silica A relationship between surface characteristics and adsorption isotherms. J, Chem. Technoi, Biotechnol.. 63(3). 249-256 (1995). 

Gonzdlez-Garda et al. (2001) describe the adsorption isotherms at 20 °C of four AC of the non-ionic surfactant Triton X-100 from aqueous solution over a wide concentration range. The adsorption was explained using one or a combination of two Langmuir equations, depending on the equilibrium concentration range studied. The results indicate that there are at least two kinds of interactions, the first related to a direct interaction between the AC surface and adsorbate molecules, and the second mainly due to the interaction... 

A typical experimental example for the characterisation of the adsorption properties of a surfactant, at the water/air interface is shown in Figs. 9 and 10, where the dynamic surface tension and the corresponding equilibrium data for the surfactant Triton X 100 are reported. The best fit for the surface tension isotherm is given by the two state model [39] which assumes that molecules can adsorb in two different states, 1 and 2. 

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