1 research outputs found
Adsorbents for iron removal obtained from vermiculite
In presented work, raw, expanded and acid
treated vermiculites were used as low-cost and active adsorbents for reducing o
f
environmental pollution with heavy metals. Acid treatment was
performed at elevated temperature (95°C) for 2 and 24 h in
solution of HNO
3
. Adsorption capacity towards Fe
3+
was studied in column, semi-
b
atch and batch mode. It
was shown that all
samples are effective in removal of heavy metals; however
adsorption mechanism is based not only on ion exchange o
f
interlayer cations but also precipitation/
deposition processes. Starting material a
nd modified samples as well as spent
adsorbents were characterized with
respect to the vermic
ulite structure using X-ray diffraction metho