Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) The power of power: electrokinetic control of PAH interactions with exfoliated graphite
Autor Qin, J.; Moustafa, A.; Harms, H.; El-Din, M.G.; Wick, L.Y.;
Journal / Serie Journal of Hazardous Materials
Erscheinungsjahr 2015
Department UMB;
Band/Volume 288
Sprache englisch;
POF III (gesamt) T41;
Keywords Exfoliated graphite; DC electric field; Electroosmosis; Sorption; Polycyclic aromatic hydrocarbons (PAH)
UFZ Querschnittsthemen RU3;
Abstract Exfoliated graphite (EG) exhibits exceptional sorption capacity for petroleum and dissolved hydrocarbons owing to its highly hydrophobic surface and wide pore size distribution. The high price of preparing EG, however, restricts its application. Methods which increase the rate or extent of sorption to EG even further are thus longed for. Here, we assess the effects of weak direct current (DC) fields on the sorption of the polycyclic aromatic hydrocarbon phenanthrene (PHE) to EG. DC applied to an ionic solution in a solid matrix invokes electroosmotic flow (EOF), i.e., the surface charge-induced movement of the solution. EG was exposed to weak DC fields in the presence of dissolved PHE to test if EOF increases transport of PHE to poorly accessible sorption sites. DC fields increased PHE sorption rates in EG sevenfold and reduced the desorption rate of sorbed PHE by >99%. EOF thus appeared to be highly effective in translocating PHE into pores, which contribute most of the sorption sites, but are difficult to access in the absence of EOF by molecular diffusion only. The observed ‘power of power’ may be used to kinetically regulate the interaction of sorbates with EG or other porous sorbents in environmental (bio-) technology.
ID 16090
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16090
Qin, J., Moustafa, A., Harms, H., El-Din, M.G., Wick, L.Y. (2015):
The power of power: electrokinetic control of PAH interactions with exfoliated graphite
J. Hazard. Mater. 288 , 25 - 33