At acidic pH ≈2, in which higher level CrVI elimination was observed, adsorbent surface was highly protonated, facilitating HCrO4 anion removal as a result of electrostatic interactionbased adsorption. However, surface protonation decreased when pH was increased.
A pH ácido alrededor de 2,en el cual se observan los mayores porcentajes de remoción de CrVI, la superficie del adsorbente está altamente protonada, facilitando la remoción de los aniones HCrO4 como resultado de las atracciones electrostáticas.