Hydrotalcite Mg/Al-NO_3 from Sea Water as Adsorbent of CU~(2+) and Cr~(6+) Metals

摘要

Seawater is a renewable natural resource that is easy to get for use in various purposes. Seawater has many mineral deposits, one of which is MgCl_2. This research aims to synthesize Mg/Al-NO_3 hydrotalcite-like with Mg raw material from seawater, characterization and test the adsorption capacity to Cu~(2+) and Cr~(6+) metals. Mg/Al hydrotalcite-like synthesis with NO_3 interlayer was performed on a 2: 1, 2,5: 1, 3: 1-mole ratio with pH 10 for 1 hour coprecipitated. Characterization of Mg/Al-NO_3 Hydrotalcite-like using Atomic absorption spectrophotometry (AAS), X-Ray Diffraction (XRD), XRF (X-ray fluorescence spectrometry), Surface Area Analyzer (SAA). The hydrotalcite-like adsorption power application was tested against Cu~(2+) and Cr~(6+) metals. The results showed that Mg/Al-NO_3 Hydrotalcite-Like formed at d003, d006, and d110 were 8,55, respectively; 3,86; and 1,51 A according to the ICDD Hidrotalsit Mg/Al-NO_3 standard, and the area covered by SAA was 132,081 m~2/g, with compositions tested by XRF on Mg(OH)_2 and Al(OH)_3 were 11,5 g/ml and 20,3 g/ml, respectively. Hidrotalsit Mg/Al-NO_3 adsorption Cu~(2+) occurred of 3,63 mg/g at 30 min contact time and Cr~(6+) metal of of 0,75 mg/g at contact 60 minutes.