Adsorption of Sodium Hexadecyl Sulfate and Triton X from Binary Aqueous Solutions at Thermally Graphitized Carbon Black

Abstract

<jats:p>Adsorption of anionic sodium hexadecyl sulfate (SHS) and nonionic Triton X surfactants with different ethoxylation degree: TX-45, TX-100 and TX-300 from their individual and mixed aqueous solutions at the surface of thermally graphitized carbon black (CB) was studied. It was found that at low solution concentrations addition of the nonionic surfactant increases the amount of SHS adsorbed from SHS/Triton X mixtures compared to SHS amount adsorbed from its individual solution. These findings might be explained by decreasing in electrostatic repulsion between SHS ions due to inclusion of the molecules of the nonionic surfactant in the mixed adsorption layer. At higher solution concentrations, adsorption of SHS decrease as a result of displacement of SHS ions from the mixed adsorption layer by Triton X molecules. It was established that the composition of the mixed adsorption layer at CB surface notably differ from the composition of the surfactant mixture in the bulk solution. The mixed adsorption layer is enriched with the molecules of the nonionic surfactants and this conclusion is confirmed by the results of measuring zeta potential of CB particles with the adsorbed surfactants.</jats:p>

Conductive Properties of Polyester/Spandex Fabrics Using Liquid Carbon Black and Disperse Black Dye

“…When the granular CB is in the process of high-speed mechanical deconstruction, mechanical deconstruction force can be due to smaller CB particle size, while the surfactant can form electrostatic and physical adsorption on the surface of CB. CB adsorption of anionic surfactant changes the nature of the charge of the CB particle plasmas in water, which is caused by the strong van der Waals forces between the hydrophobic group of the anionic surface active group and the CB and is an exothermic process. − …”

Kinetic and thermodynamic investigations of surfactants adsorption from water by carbide-derived carbon

“…[31,32] It is suggested that the hydrophobic interactions between the hydrophobic chains of TX-100 molecules and the sorbent surface is the main mechanism of the adsorption of the nonionic surfactant on CDC, similarly to TX-100 adsorption on other carbon-based adsorbents. [60,61] The effect of the pH of the feed solution on the adsorption capacity of SDBS and HDPB is illustrated in Figure 7. It can be seen in this figure that the adsorption capacity for SDBS has decreased from 481 to 425 mg/g by increasing the pH from 2.5 to 10.…”