Abstract
Adsorption of quinoline (Q, C 9H 7N) on aqueous suspensions of sepiolite, palygorskite and saponite was determined experimentally in a wide pH range. The enhancement of adsorption with increasing pH and some release of OH − were observed. The clay minerals showed, at short reaction times, a higher adsorption and then this decreased along the time. Displaced Mg 2+ from octahedral sheet decreased when the Q adsorption happened. The surface of the mineral covered by the molecules at a 20 mM Q total concentration practically coincided with the BET surface for sepiolite and palygorskite. In the case of saponite, it coincided with the EGME surface. The obtained data suggest three possible mechanisms that could be involved in the interaction between Q and the surface of the mineral. 1) Adsorption of Q on surface sites (SiOH, AlOH, MgOH, FeOH) on the broken edges of the mineral via the donation σ of the N electron pair of the Q. 2) Adsorption via ¶ links on the external surface (sepiolite and palygorskite) and on the external and interlayer surface (saponite). 3) A process of ion exchange in which protonated Q (QH +) replaces Na +.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
