O. A. Kangina, M. G. Chernysheva, G. A. Badun, A. V. Lishai, N. G. Tsygankova, T. A. Savitskaya, D. D. Grinshpan
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引用次数: 0
Abstract
This work is devoted to studying the adsorption of sodium dodecyl sulfate (SDS) and sodium N-lauryl sarcosinate (NLS) on activated carbons produced from hydrolytic lignin using laboratory and pilot setups. Commercially available activated carbons produced by “Sorbent” Ltd. and SKT-3 are used for comparison. The surface of the activated carbons is modified (hydrophilized) by cellulose sulfoacetate (CSA) adsorption from aqueous solutions. Amounts of surfactants adsorbed on the activated carbon surface are determined from their radioactivity using tritium-labeled compounds. It has been found that the maximum adsorption of anionic surfactants is higher on activated carbons obtained from lignin. Adsorption values in the saturation region are 1.7 and 1.5 mmol/g for SDS and NLS on activated carbons obtained from lignin and 0.8 mmol/g for both surfactants adsorbed on commercial carbons. It has been shown that the preliminary application of CSA does not affect the maximum adsorption of NLS at its high concentrations; however, it reduces its adsorption in the initial region of the isotherm. Adsorption of CSA and its ability to be retained on the surface of the activated carbons is also studied. Tritium-labeled CSA has been used to show that the isotherm of its adsorption on activated carbon obtained from lignin is S-shaped beginning from a concentration of 0.5 g/L and reaches a maximum value of 25 mg/g. In the presence of NLS, the polymer is desorbed from the carbon surface by more than 50%.
期刊介绍：
Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.
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