Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: ionic surfactants

Sortuj według:

Ogranicz wyniki do:

Alumina-silica-titania adsorbent for hazardous azo and phtalocyanine dyes removal from textile baths and wastewaters – the impact of ionic surfactants

Wiśniewska Małgorzata, Wrzesińska Katarzyna, Wawrzkiewicz Monika, Chibowski Stanisław, Urban Teresa, Goncharuk Olena, Gun’ko Vladimir M.

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 6

178--193

Two aspects of interfacial phenomena were discussed in the manuscript. The first one concerns the adsorptive removal of two azo dyes such as C.I. Acid Yellow 219 (AY219) and C.I. Direct Yellow 142 (DY142) as well as the phtalocyanine C.I. Reactive Blue 21 (RB21) on the alumina silicatitania oxide (4% wt. Al2O3 – 8% wt. SiO2 – 88% wt. TiO2; AST88) in the ionic surfactants presence. The second one deals with the determination of interaction mechanism in the dyes-AST88, dyes-surfactant-AST88 systems using the data obtained from the surface charge density and zeta potential studies. The sodium dodecyl sulphate (SDS) with anionic character and hexadecyltrimethylammonium bromide (CTAB) with cationic ones were used. The adsorption capacities of 205.2 mg/g for AY219, 36.5 mg/g for RB21 and 18 mg/g for DY142. The potentiometric titration and Doppler laser electrophoresis methods enable determination of sign and magnitude of charge located in both the surface and the slipping plane layers around the solid particles. The structure of electrical double layer was determined in the AST88 systems without as well as with dyes and with mixed dye + surfactant adsorbates.

Heterocoagulation of hydrophobized particulates by ionic surfactants

Çelik M., Ozdemir O.

Physicochemical Problems of Mineral Processing

2018

Vol. 54, iss. 1

124--130

Hydrophobic particulates, i.e. bubbles, precipitates, and coal particles are shown to exhibit similar isoelectric point (iep) values in the presence of ionic surfactants. While coal in anionic surfactant solutions exhibits negative zeta potentials in the entire pH region, coal in cationic surfactant solutions undergoes a charge reversal in alkaline pH. Adsorption and zeta potential measurements together with previously published results indicate that ionic surfactants adsorb on coal through hydrophobic bonding driven by entropy. Physicochemical similarities in the adsorption mechanisms of ionic surfactants onto the bubbles, precipitates, and coal particles are proposed to be responsible for the observed iep values and also heterocoagulation phenomena.

Oil agglomeration of mineral tailings in mixed-surfactant systems

Polowczyk I., Bastrzyk A., Koźlecki T., Sawiński W., Wróbel I., Sadowski Z.

Czasopismo Techniczne. Chemia

2008

R. 105, z. 2-Ch

219-228

In this paper the results of spherical oil agglomeration of mineral tailings were presented. Tailings from nickel recovery (the Szklary heap, Lower Silesia, Poland) were used in these investigations. Agglomeration experiments have been carried out in water suspension of mineral particles in the presence of cationic and anionic surfactants and kerosene as bridging oil.

W niniejszym artykule przedstawiono wyniki badań procesu aglomeracji olejowej odpadów mineralnych, pozostałych po hutniczej obróbce rudy niklowej, zgromadzonych na hałdzie w okolicach miejscowości Szklary na Dolnym Śląsku. Proces prowadzono w zawiesinie wodnej cząstek mineralnych w obecności surfaktantu kationowego oraz anionowego, użytych jako substancje modyfikujące właściwości powierzchniowe ciała stałego oraz emulgatora oleju (nafty) w wodzie.