| Summary: | Synthesis of Zn-Al-EDTA hydrotalcite and its application as adsorbent for
Pb2+ ion have been studied. The aim of this research was to study the ability of
Zn-Al-EDTA hydrotalcite as adsorbent of Pb2+ ion. Acidity condition, kinetics,
and adsorption capacity along with characterization of Zn-Al-EDTA hydrotalcite
solid crystal after adsorption and after desorption were studied. The Zn-Al
hydrotalcite with nitrate anion in interlayer was first synthesized by
coprecipitation method followed by hydrothermal treatment at 100°C for 15 h.
The nitrate anion was exchanged with EDTA to yield Zn-Al-EDTA hydrotalcite.
The Zn-Al-EDTA hydrotalcite was characterized using X-ray Difractometer
(XRD) and Fourier Transform-Infra Red Spectrofotometer (FT-IR).
Characterization of Zn-Al-EDTA hydrotalcite using XRD showed that the
basal spacing d003 before and after ion exchange was 8.90 � and 14.52 �. The FTIR
spectra suggested that C=O group was observed at wave number of 1684,77
cm-1. The optimum condition for adsorption of Pb2+ ion was obtained at pH 4,
contact time 60 min. and adsorption capacity 2.07 mg/g at initial concentration of
10 mg/L. The result showed that Pb2+ ion was adsorbed by Zn-Al-EDTA
hydrotalcite according to pseudo second order of reaction with reaction rate 8,90 g
mmol-1min-1. Adsorption of Pb2+ ion by Zn-Al-EDTA hydrotalcite happened
because of the complex formation between Pb2+ and EDTA in the interlayer
space of Zn-Al-EDTA hydrotalcite.
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