Effect of benzethonium chloride adsorption on the electrosurface properties of titanium dioxide in aqueous suspensions
Journal Title: Хімія, фізика та технологія поверхні - Year 2018, Vol 9, Issue 3
Abstract
The purpose of this research article is to study the influence of additives of cationic surfactant - benzethonium chloride and the pH of the initial solutions from which suspensions were prepared on the electro-surface properties of titanium dioxide of rutile modification in its aqueous suspensions as well as to detect changes in the ratio between positively charged and negatively charged surface hydroxyl groups due to adsorption of surfactant molecules. In this study, we used powdered rutile-form titanium dioxide (average particle diameter 0.23 µm and specific surface area 14.6 m2/g), the surface of which was modified with inorganic oxides (Al2O3, 4 %, and SiO2, 2 %) and graft hydrocarbon chains in order to impart required optical properties and regulate of hydrophobic–hydrophilic balance. Benzethonium chloride is an industrial surfactant that is widely used to regulate the colloidal and chemical properties of many disperse systems. According to the results of the research, it has been found that additives of benzethonium chloride to aqueous suspensions of titanium dioxide have a significant effect upon its electro-surface properties. By using the 2-pK model of a double electric layer and a multistage model of surfactant adsorption on a solid surface, it has been found that the adsorption of benzethonium chloride molecules results in a decrease in the number of surface neutral hydroxyl groups and in the redistribution of superficial positive and negatively charged hydroxyl groups. The character of the redistribution of these groups depends on the pH of the aqueous solutions on the basis of which the suspensions of titanium dioxide were prepared. By evaluating the effect of adsorption of benzethonium molecules on the electro-surface properties of titanium dioxide in its aqueous suspensions, three sites of their dependence on the pH of the initial solutions can be distinguished: the first in the range from pH ≈ 2 to pH ≈ 5, the second in the range from pH ≈ 5 to pH ≈ 9 and the third in the range from pH ≈ 9 to pH ≈ 12. The dependence analysis of the adsorption of benzethonium chloride molecules on the pH of the initial solutions shows that adsorption increases slightly in the first section, does not show any significant fluctuations in the second one, and increases significantly in the third one due to an increase in the pH of the output solutions. The adsorption quantities of benzethonium chloride on titanium dioxide which have been theoretically predicted according to the proposed model, are in good agreement with the experimental results. An increase in the concentration of benzethonium chloride in suspensions involves the displacement of the isoelectric point of the investigated suspensions of titanium dioxide into the alkaline region. The obtained results are in good agreement with the experimental results of the study of the dependence of the zeta potential of titanium dioxide suspensions on the concentration of benzethonium chloride. The found dependencies allow to purposefully regulate properties of aqueous suspensions of titanium dioxide for production of necessary technological compositions.
Authors and Affiliations
R. S. Petryshyn, Z. M. Yaremko
Keywords
Related Articles
- EP ID EP461672
- DOI 10.15407/hftp09.03.301
- Views 87
- Downloads 0
Фізико-хімічний аспект терапевтичної дії ентеросорбентів (теоретичне дослідження)
Активне просування ентеросорбентів на ринок випереджає детальне вивчення механізмів їхньої лікувальної дії. У споживачів і навіть серед спеціалістів популярністю користується спрощена думка про те, що ентеросорбенти лише...
Nonporous platinum doped titania films: synthesis, optical and photocatalytic characteristics
The simple and fast route of the synthesis of platinum ions doped titania thin films is designed where platinum(II) acetylacetonate is used as a perspective doping agent due to the possibility of platinum incorporation i...
Супрамолекулярні взаємодії природних флавоноїдів з катіонною ПАР етонієм в розчинах і на поверхні нанокремнезему
Показано, що супрамолекулярні взаємодії кверцетину та рутину з катіонною димерною поверхнево-активною речовиною етонієм приводять до зміни їх фізико-хімічних властивостей – батохромного зсуву електронних спектрів поглина...
Разные методы для описания морфологических и текстурных характеристик различных материалов
Целью данной работы было сравнение разных методов для описания текстурных характеристик разных материалов. Несколько путей могут быть избраны для описания морфологии и текстуры различных материалов: (i) адсорбция-десорбц...
Вплив адсорбції бензетоній хлориду на електроповерхневі властивості діоксиду титану у водних суспензіях
Мета роботи – вивчити вплив добавок катіонної поверхнево-активної речовини – бензетоній хлориду, та рН вихідних розчинів, на основі яких готували суспензії, на електроповерхневі властивості діоксиду титану рутильної моди...