Abstract—This research is to study the removal of chromium
and iron from spent hard chrome plating solutions using
eggshell as selected bio-waste sorbent. It was found from the
batch experiments that the chemically modified eggshell with
hydrochloric acid resulted in better performance in comparison
with the unmodified eggshell. The removal efficiency as well as
adsorption capacity for Fe(II), Cr(III), and Cr(VI) were 95%,
100%, 13% and 94.5 mg/g, 18.8 mg/g, 173.4 mg/g, respectively
in 48 h. The kinetics of chromium and iron sorption were
described by pseudo first order and pseudo second order kinetic
models. The experimental kinetic data fitted well with the
pseudo second order kinetic model for both chromium and iron.
The adsorption isotherms using Langmuir and Freundlich
models were also evaluated by linearized forms. The best-fitted
model to the experimental equilibrium data for eggshell sorbent
was found to be the Freundlich model. From this investigation,
the purification and recovery of hard chrome bath from spent
plating solutions can be achieved using eggshell adsorption.
Index Terms—Hard chrome, recycling, eggshell, biosorbent.
Theeraporn Rubcumintara is with the Department of Chemical
Engineering, Faculty of Engineering, Mahidol University, Puttamonthon 4
Rd., Nakhonpathom, Thailand (e-mail:theeraporn.rub@mahidol.ac.th).
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Cite:Theeraporn Rubcumintara, "Chromium and Iron Removal for Hard Chrome Bath Recycling using Eggshell Sorbent," Journal of Clean Energy Technologies vol. 2, no. 2, pp. 158-162, 2014.
