2.4. X-ray computed tomography
X-ray computed tomography was utilized to gain access into the
three-dimensional (3-D) structure of the foam and some aspects of
the distribution of Cr following the filtration experiments. An X-ray
computed tomography apparatus equipped with a 5 μm focal
spot reflection target X-ray tube source and digital sensor analysis of
1024 × 1024 pixels operating in the absorption mode, was used to
acquire 3D images of the Cu-foam samples used before and after the
Cr(VI) removal experiments. The measurements were carried out
using the WinWerth software of the Werth CT measuring machine,
leading to the 3D volumetric data,whichwere processed and presented
on several views and a perspective view using the VG Studio Max software.
The basic morphological characteristics of the foams used were
also obtained by image analysis.