Keyword : preparation, characterization, Mg/Al HTlc, brine water, raw material, pharmacy

By: Eddy Heraldy and Yuli Puspito Rini

The synthesis of Mg/Al hydrotalcite-like (HTlc) using brine water from desalination waste for raw material pharmacy industries has been performed. Sample preparation of Mg/Al HTlc are using artificial brine water and brine water from desalination waste of PLTU Tanjung Jati B, Jepara, Central Jawa, respectively. Firstly, calsium content in brine water was removed by adding mixed solution Na2CO3-NaHCO3 with agitation for 1 h at 95±2⁰C. Then, into calcium free brine water was added AlCl3 with Mg/Al molar ratio of 2.0. With constant pH at pH 10.5±2, the solution was then continuously stirred for 1 hour at 70⁰C. The suspension product was filtered off, washed with distilled water until free of chloride ion. After that, all samples were dried overnight.

The obtained samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and surface area measurements. According to XRD results, the present study was able to show that the sample exhibit the (003) reflection around 7.6Ǻ, typical for Mg/Al HTlc with carbonate interlayer. This condition were supported by FT-IR results that characteristic of hydrotalcite peak appears around 3500 cm-1 are attribute to the stretching mode of OH groups, the wavenumber between 3000-3100 cm-1 due to hydrogen bonding of interlayer water with interlayer carbonate anion and the bending vibration of interlayer water is found around 1630 cm-1. Antisymmetric vibration of carbonate anion were shown around 1350-1400 cm-1, while corresponds to lattice vibrations of Mg-O, Al-O and /or Mg-O-Al are found below 1000 cm-1. From XRD and FT-IR characterization were proven that synthesis result is Mg/Al HTlc. In addition, the spesific surface area result was 30.82 m2.g-1 and be classified as microporous. Because Mg/Al HTlc synthesized has a relatively big spesific surface area, the sorption capacity of Mg/Al HTlc would be big too. From this preliminary studies, therefore, Mg/Al HTlc from brine water as possible as a raw material pharmacy industries.