Adsorption of Strontium from an Aqueous Solution by TiO2-Pillared Zeolite
Corresponding email: kristri_basuki@batan.go.id
Published at : 19 Jul 2021
Volume : IJtech
Vol 12, No 3 (2021)
DOI : https://doi.org/10.14716/ijtech.v12i3.4376
Basuki, K.T., Fatuzzahroh, M., Ariyanti, D., Saputra, A., 2021. Adsorption of Strontium from an Aqueous Solution by TiO2-Pillared Zeolite. International Journal of Technology. Volume 12(3), pp. 625-634
| Kris Tri Basuki | Department of Nuclear Chemical Engineering, STTN-BATAN, Jl. Babarsari, Yogyakarta 55821, Indonesia |
| Muni Fatuzzahroh | Department of Nuclear Chemical Engineering, STTN-BATAN, Jl. Babarsari, Yogyakarta 55821, Indonesia |
| Dhita Ariyanti | Department of Nuclear Chemical Engineering, STTN-BATAN, Jl. Babarsari, Yogyakarta 55821, Indonesia |
| Andri Saputra | Politeknik ATK Yogyakarta, Jl. Prof. Dr. Wirdjono Prodjodikoro, Bantul, Yogyakarta 55188, Indonesia |
Strontium
is a heavy metal that is
commonly found in many groundwater systems because of migration from
historic nuclear waste storage sites.
Its radiation effect can cause bone cancer, tumors,
and leukemia. An economical and
the most
effective method to remove heavy metals from aqueous solutions
is adsorption. In this study, we synthesized a TiO2-pillared zeolite
to improve
the adsorption efficiency of the zeolite. The TiO2-pillared zeolite was synthesized via
the pillarization process. Adsorbent characterization
was done using X-ray powder diffraction, which
showed that TiO2 was successfully pillared. Fourier-transform
infrared spectroscopy showed a shift in the peak at a wavenumber of 3425.70 cm?1,
which can be attributed to the addition of TiO2. A parameter study
conducted using a batch experiment showed that optimal strontium adsorption took
place at pH 5 and
contact time of 80 min. The Freundlich adsorption
isotherm
fitted the experimental data well, illustrating the adsorption of strontium
as being
non-ideal, reversible, and multilayer adsorption that
occurs on the
heterogeneous surface of the TiO2-pillared zeolite. A thermodynamic study indicated that strontium
adsorption on the TiO2-pillared zeolite was an endothermic process, takes place spontaneously, and is quite stable.
Adsorption; Strontium; Titanium dioxide; Zeolite
In Indonesia, nuclear technology
usage has increased in the fields such as agriculture, advanced materials,
food, nuclear medicine, and industrial manufacturing. However, this has
resulted in an increase in radioactive waste. Toxicological and radiological effects
caused by radioactive wastewater on human health and the ecosystem are serious
concerns. Radioactive wastewaters commonly contain strontium, which is a pure
beta emitter, has a half-life of 28.8 years, and is commonly found in
groundwater systems near nuclear storage sites (Pathak,
2017). Strontium enters the human body through ingestion, and its
radiation effects include bone cancer, tumors, and leukemia (Herhady et al., 2003). Because of its high
radiological toxicity and relatively long half-life, strontium removal from
aqueous solutions is of great interest.
Strontium
removal has been attempted using membrane separation, ion exchange, chemical
precipitation, and adsorption. For low-strength wastewaters, in particular, most
of these processes are inefficient and expensive (especially ion exchange) (Hasan et al., 2019). In contrast, adsorption has
been proven to be effective in reducing the concentration Research on strontium
adsorption has been carried out using several adsorbents, such polyacrylonitrile(PAN)-zeolite
(Yusan and Erenturk, 2011), Ca-alginate (Song et al., 2013), SBA-15 (Zhang et al.,
2015), Chitosan-Fuller’s earth beads (Hasan et al., 2019), and K2Ti4O9 (Lee et al., 2018).
The zeolite
was successfully pillared by TiO2. Diffraction angle 2? peaks of TiO2
were found at 25.33°, 36.7°, 47.9°, and 54.9°. The FTIR spectra showed that
the shift at wavenumber 3425.70 cm?1 occurs due to the addition of
TiO2. Based on the batch experiment results, the best parameters for
strontium adsorption were found to be pH 5 and contact time of 80 min. The
adsorption of strontium by the TiO2-pillared zeolite is defined as
adsorption on a heterogeneous surface and as being non-ideal, reversible, and
multilayer adsorption. Although the adsorption capacity is low, the
thermodynamic study indicated that the adsorption of strontium onto TiO2
pillared zeolite was an endothermic process that takes place spontaneously and is
quite stable. For future work, the adsorption
capacity needs to be increased, which
can be accomplished by reducing
the size of the pillared TiO2 to allow more area for strontium to be absorbed.
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