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Investigation of removal possibilities of chromium(III) oxide from water solution in the presence of albumins
Szewczuk-Karpisz, K. & Wiśniewska, M.
Abstract
System destabilization is a highly desirable
phenomenon during colloidal impurity removal from
sewages and wastewaters. Therefore, in this study, the
stability of chromium(III) oxide suspension in the absence
and presence of albumins [bovine serum albumin (BSA),
ovalbumin (OVA), human serum albumin (HSA)] was
investigated. Based on the analysis of experimental results,
i.e., measurements of adsorption amount, electrokinetic
potential, and metal oxide surface charge density as well as
system stability, the mechanism of the suspension stabilization/
destabilization was proposed. The examined system
without the albumins is relatively stable at pH 3, 4.6, and 9
(TSI = 34.8, 36.6, 34.22, respectively), which is associated
with the electrostatic stabilization phenomenon. In turn, the
least stable is the suspension at pH 7.6 (TSI = 55.43). This
is the result of the adsorbent zero surface charge.
Regardless of solution pH, the BSA, OVA, or HSA
adsorption causes an increase in the system stability
(17.55 < TSI < 30). Probably, the steric stabilization is
involved in this phenomenon, which results from the
mutual repulsion of the adsorption layers formed on the
solid surface. Thus, it can be concluded that the albumin
presence in the industrial wastewaters impedes the chromium(
III) oxide removal.
Keywords
Albumin adsorption; Colloids; Electrostatic and steric stabilization; Zeta potential
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