TY - JOUR
T1 - Adsorption of zwitterionic surfactant on limestone measured with high-performance liquid chromatography
T2 - Micelle-vesicle influence
AU - Nieto-Alvarez, David Aaron
AU - Zamudio-Rivera, Luis S.
AU - Luna-Rojero, Erick E.
AU - Rodríguez-Otamendi, Dinora I.
AU - Marín-León, Adlaí
AU - Hernández-Altamirano, Raúl
AU - Mena-Cervantes, Violeta Y.
AU - Chávez-Miyauchi, Tomás Eduardo
N1 - Publisher Copyright:
© 2014 American Chemical Society.
PY - 2014/10/21
Y1 - 2014/10/21
N2 - Herein is presented a new methodology to determine the static adsorption of a zwitterionic surfactant on limestone in three different aqueous media [high-performance liquid chromatography (HPLC) water, seawater, and connate water] with the use of HPLC at room temperature and 70 °C. The results showed that, in both HPLC water and seawater, the surfactant adsorption followed a monolayer Langmuir tendency. In contrast, for connate water, the surfactant presented a new adsorption profile, characterized by two regions: (i) At surfactant concentrations below 1500 mg L-1, an increase of adsorption is observed as the amount of divalent cations increases in the aqueous media. (ii) At surfactant concentrations above 1500 mg L-1, the adsorption decreases because the equilibrium, monomer ← micelle ← vesicle, is shifted to the formation of vesicles, giving as a result a decrease in the concentration of monomers, thus reducing the interaction between the surfactant and the rock, and therefore, lower adsorption values were obtained. The behavior of the surfactant adsorption under different concentrations of divalent cations was well-described by the use of a new modified Langmuir model: (dγ/dt)ads = kadsc(γ∞ - γ) - kcmc(c - ccmc)nγH(c - ccmc). It was also observed that, as the temperature increases, the adsorption is reduced because of the exothermic nature of the adsorption processes.
AB - Herein is presented a new methodology to determine the static adsorption of a zwitterionic surfactant on limestone in three different aqueous media [high-performance liquid chromatography (HPLC) water, seawater, and connate water] with the use of HPLC at room temperature and 70 °C. The results showed that, in both HPLC water and seawater, the surfactant adsorption followed a monolayer Langmuir tendency. In contrast, for connate water, the surfactant presented a new adsorption profile, characterized by two regions: (i) At surfactant concentrations below 1500 mg L-1, an increase of adsorption is observed as the amount of divalent cations increases in the aqueous media. (ii) At surfactant concentrations above 1500 mg L-1, the adsorption decreases because the equilibrium, monomer ← micelle ← vesicle, is shifted to the formation of vesicles, giving as a result a decrease in the concentration of monomers, thus reducing the interaction between the surfactant and the rock, and therefore, lower adsorption values were obtained. The behavior of the surfactant adsorption under different concentrations of divalent cations was well-described by the use of a new modified Langmuir model: (dγ/dt)ads = kadsc(γ∞ - γ) - kcmc(c - ccmc)nγH(c - ccmc). It was also observed that, as the temperature increases, the adsorption is reduced because of the exothermic nature of the adsorption processes.
UR - http://www.scopus.com/inward/record.url?scp=84962182939&partnerID=8YFLogxK
U2 - 10.1021/la501945t
DO - 10.1021/la501945t
M3 - Artículo
AN - SCOPUS:84962182939
SN - 0743-7463
VL - 30
SP - 12243
EP - 12249
JO - Langmuir
JF - Langmuir
IS - 41
ER -