Study of the Surface Charge of a Porous Clay Heterostructure (PCH) and Its Adsorption Capacity of Alkaline Metals

Authors

  • Sofía Arellano-Cárdenas Instituto Politécnico Nacional
  • Tzayhrí Gallardo-Velázquez Instituto Politécnico Nacional
  • Guillermo Osorio-Revilla Instituto Politécnico Nacional
  • Ma. del Socorro López-Cortez Instituto Politécnico Nacional

DOI:

https://doi.org/10.29356/jmcs.v54i2.951

Keywords:

clay, PCH, metal adsorption, surface charge

Abstract

A Porous Clay Heterostructure (PCH) was prepared by chemical modification of a natural clay, by intercalation of a cationic surfactant. Its surface charge properties as well as its adsorption capacity for alkali metals were studied using a potentiometric titration method. The PCH developed a pH-dependent charge (sH), probably due to the presence of amphoteric silanol groups (SiO2) coming from the pillars of silica interlayered during the pillared process. The PCH presented a region of zero charge in the range of pH of 4.0 to 7.7. The sH acquired by the PCH was adjusted with good correlation to the electric double layer model of Gouy-Chapman (r2 = 0.9925). The surface charge conferred the PCH ion exchange capacity for the studied metals (Li, Na, K, Rb and Cs) at high pH values (10 < pH), in comparable quantities (3.5 to 6 meq/g) to some Dowex resins. The results of this study suggest that PCH could have applications in the recovery of toxic metals from waste waters.

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Author Biographies

Sofía Arellano-Cárdenas , Instituto Politécnico Nacional

Departamento de Biofísica. Escuela Nacional de Ciencias Biológicas 

Tzayhrí Gallardo-Velázquez, Instituto Politécnico Nacional

Departamento de Biofísica. Escuela Nacional de Ciencias Biológicas

Guillermo Osorio-Revilla, Instituto Politécnico Nacional

Departamento de Ingeniería Bioquímica. Escuela Nacional de Ciencias Biológicas

Ma. del Socorro López-Cortez, Instituto Politécnico Nacional

Departamento de Biofísica. Escuela Nacional de Ciencias Biológicas

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2019-06-17

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