Determination of the free energy of adsorption on carbon blacks of a nonionic surfactant from aqueous solutions

Journal Article · Tue Apr 18 04:00:00 EDT 2000 · Langmuir

DOI:https://doi.org/10.1021/la9809980· OSTI ID:20075535

Gonzalez-Garcia, C M; Gonzalez-Martin, M L; Gomez-Serrano, V; Bruque, J M; Labajos-Broncano, L

The adsorption of a nonionic surfactant (Triton X-100) from aqueous solutions has been studied on six carbon blacks with very different specific surface areas. The surface area occupied per surfactant molecule on the carbon black surface and the free energy of adsorption have been evaluated from the adsorption isotherms. Also, the free energy of adsorption has been determined from the free energy of interaction between adsorbent and adsorbate through water. The results obtained from both methods are in good agreement. They indicate that adsorption progresses following two different processes: the first one deals with the direct interaction between carbon black surface and adsorbate molecules, and the second one mainly due to the interaction between surfactant molecules at the adsorbent-solution interphase.

• Research Organization: Univ. de Extremadura, Badajoz (ES)
• OSTI ID: 20075535
• Journal Information: Langmuir, Journal Name: Langmuir Journal Issue: 8 Vol. 16; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
ADSORPTION ISOTHERMS
AQUEOUS SOLUTIONS
CARBON BLACK
SORPTIVE PROPERTIES
SURFACE AREA
SURFACTANTS