Surface properties of coal fines in water. II. Isotherms, electrokinetics and chainlength dependence for cationic surfactant adsorption

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Coal Prep. (Gordon and Breach); (United States)

DOI:https://doi.org/10.1080/07349348508905149· OSTI ID:6410376

Ayub, A L; Hayakawa, K; Al Taweel, A M; Kwak, J C.T.

The adsorption of the cationic surfactants, dodecylpyridinium chloride, tetradecyl pyridinium bromide and hexadecylpyridinium bromide on run of mine coal at varying pH's has been studied. The effect of these surfactants on the zeta potential as a function of pH was determined. Surfactant adsorption increases in the order C16 >> C14 > C12, and generally increases with increasing pH, especially for the longer chainlengths. Microelectrophoretic zeta potential measurements clearly show the effect of surfactant adsorption, and when pH is greater than iep, i.e. when the coal is negatively charged, charge reversal of the coal surface occurs in all cases. It is concluded that adsorption of cationic surfactants involves both electrostatic (headgroup) and hydrophobic (alkyl chain) interactions with the coal surface. 32 references.

• OSTI ID: 6410376
• Journal Information: Coal Prep. (Gordon and Breach); (United States), Journal Name: Coal Prep. (Gordon and Breach); (United States) Vol. 2:1; ISSN COAPD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADSORPTION
CARBONACEOUS MATERIALS
CATIONS
CHARGED PARTICLES
COAL
COAL FINES
COAL PREPARATION
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
IONS
MATERIALS
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POTENTIALS
POTENTIOMETRY
SORPTION
SPECTROPHOTOMETRY
SURFACE POTENTIAL
SURFACE PROPERTIES
SURFACTANTS
TITRATION
WATER