Publikacje

Abstract:

The adsorption of phenol (Ph), bisphenol A (BPA), 2,4-dichlorophenoxyacetic acid (2,4-D) and
ibuprofen (IBU) from aqueous solutions on two raw bentonites was investigated. The adsorption
was strongly pH-dependent—the removal of all the adsorbates decreased significantly with an
increase in the initial pH of the solution. The kinetics was fitted with the pseudo-first-order, pseudo-
second-order, Elovich, and intra-particle diffusion models and the adsorption kinetics was better
represented by the pseudo-second-order equation. The adsorption rate increased in the order:
Ph < 2,4-D < BPA < IBU on both the adsorbents. The equilibrium adsorption data were modeled
with Langmuir, Freundlich, and Langmuir-Freundlich equations and results showed that it was
better described by the Langmuir-Freundlich equation. Adsorption of the selected contaminants on
both the adsorbents increased in the order Ph < 2,4-D < BPA < IBU, which correlates well with the
respective decrease in solubility of the adsorbates. Adsorption of the Ph, BPA, 2,4-D, and IBU on the
bentonites is more or less comparable with other low-cost sorbents.

POWRÓT

Strona główna > Publikacje

Comparative study on the adsorption kinetics and equilibrium of common water contaminants onto bentonite