Surface properties of coal fines in water. 1. Electrokinetics and surfactant adsorption

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

DOI:https://doi.org/10.1080/07349348508945543· OSTI ID:6421271

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

The adsorption of phenol, p-nitrophenol, the nonionic surfactant Triton X-100 (a commercial mixture of octylphenol poly ethoxylates) and the cationic surfactant dodecyltrimethyl ammonium bromide (DTAB) from aqueous solution on coal fines from a coal washing plant has been studied. Adsorbate solution concentrations range from 0-8 x 10/sup -4/ m. For the cationic and nonionic surfactants both adsorption isotherms and electrokinetic isotherms were determined. The adsorption of phenol, but not of Triton X-100 and DTAB, is found to increase with time for periods up to three hundred h. For short contract times (less than thirty h.), the amount of Triton X-100 adsorbed is about three times higher than the amount of phenol adsorbed at the same solution concentration. The electrokinetic data show that the zeta potential of the coal is not affected by the adsorption of Triton X-100. On the other hand, adsorption of the cationic surfactant strongly influences the zeta potential. For negatively charged coal, i.e., at higher solution pH (iep of the coal used is 5.3), the adsorption of cationic surfactant leads to charge reversal at a typical free surfactant concentration often well below 10/sup -4/ molal. 20 references.

• OSTI ID: 6421271
• Journal Information: Coal Prep. (Gordon and Breach); (United States), Journal Name: Coal Prep. (Gordon and Breach); (United States) Vol. 1:2; ISSN COAPD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
013000 -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ADSORPTION
ADSORPTION ISOTHERMS
AROMATICS
CARBONACEOUS MATERIALS
COAL
COAL FINES
COAL PREPARATION
DATA
ELECTRODYNAMICS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
INFORMATION
ISOTHERMS
MATERIALS
OPTIMIZATION
ORGANIC COMPOUNDS
PHENOL
PHENOLS
POTENTIALS
SORPTION
SURFACE POTENTIAL
SURFACE PROPERTIES
SURFACTANTS