Adsorption Characteristics of Cationic Surfactants on Titanium Dioxide with Quaternary Ammonium Groups and Their Adsolubilization

✍ Scribed by Kunio Esumi; Akihiro Toyoda; Masaya Goino; Tsuneo Suhara; Hiroshi Fukui; Yoshifumi Koide

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 159 KB
• Volume: 202
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1998.5455

✦ Synopsis

The adsolubilization has applications in many fields Adsorption of cationic surfactants on titanium dioxide with such as paints, drugs, cosmetics, and waste-water treatment. quaternary ammonium groups ( XNm, where m is the carbon Until now, the adsolubilization of dyes, alcohols, monomers, number of the alkyl chain, 4 -16 ) was investigated by measuring aromatic compounds, and steroids has been reported using the amount of adsorbed surfactants, z potential, and dispersion hydrophilic particles (8-13) such as alumina, silica, titastability. The cationic surfactants used were dodecyltrimethylnium dioxide, clay, and latices. Recently, the adsolubilizaammonium chloride ( DTAC ) and 1,2-bis ( dodecyltrimethyl amtion of contaminants has been examined for surfactant-based monio ) ethane dichloride ( 2RenQCl ) . The amount of surfactants adsorbed increased with increasing chain length of XNm, environmental technologies. However, desorption of surfacaccompanying a gradual increase of z potential. The dispersion tant presents a significant problem and chemical bonding of stability of XNm was very high in a whole surfactant concentrasurfactant or surfactant-like molecules to particle surfaces tion region except that of untreated titanium dioxide. The elecmay solve this problem.

tron spin resonance measurements using a spin probe methyl Suhara et al. (14) have modified various oxide surfaces 12-doxylstearate show that the order parameters are very similar by chemical vapor deposition using 1,3,5,7-tetramethfor XN4-12, but the order parameter for XN16 is higher than ylcyclotetrasiloxane, followed by hydrosilylation to graft that for XN4-12. Adsolubilization of 2-naphthol on XNm by different chains on the oxides. In the case of titanium dioxide adsorption of surfactants was also carried out: the amount of 2-naphthol adsolubilized increased with increasing surfactant modified with a dodecyl chain, the adsolubilization of 2concentration where the amount adsolubilized increased with naphthol with adsorption of cationic surfactants is enhanced increasing chain length of XNm. Further, the adsorption of with increasing concentration of the dodecyl chain (15). On 2RenQCl enhanced the amount adsolubilized greater than by the other hand, in the case of titanium dioxide modified with the adsorption of DTAC. ᭧ 1998 Academic Press quaternary ammonium groups (alkyl chain length from 4 to Key Words: adsolubilization of 2-naphthol; titanium dioxide 16), the adsolubilization of 2-naphthol by adsorption of an with quaternary ammonium groups; dimeric cationic surfactant; anionic surfactant is increased with increasing grafted alkyl order parameter. chain length (16). These results suggest that functional groups grafted on titanium dioxide influence significantly the adsolubilization of 2-naphthol by adsorption of surfactants.