Abstract:
In this research, Mg-Al-CO3, layered double hydroxide was synthesized by co-precipitation reaction between different mole ratios of Mg2+ and AL3+ in alkaline solution. The optimum yield 15.83 g of Mg-Al-CO3 LDH was obtained at the mole ratio of 3:1 (Mg2+ :Al3+). TG-DTA data of the Mg-Al-CO3, LDH sample showed the losses of surface water and adsorpted water at 59.02 and 105.42 HC, respectively. The decompositions of carbonate groups in interlayer structure and hydroxide in LDH structures were observed. In the FT IR spectrum, the broad band at 3463 cm-1 was attributed to the O-H stretching vibration in the LDH phase. The presence of carbonate in the interlayer was featured by its characteristic vibration at 1380 cm-1 and 683 cm-1. The formula of the prepared Mg-Al-CO3 layered double hydroxide was calculated to be [Mg0.7Al0.3(OH)2] (CO3)0.15.0.55H2O. In the presence work structural memory property of layered double hydroxide was studied by calcinating the sample at 400 HC and rehydration in alkaline solution. In this research, anion exchange properties of Mg-Al-CO3 layered double hydroxides were studied using model solution of sodium arsenite (NaAsO2)The intercalation of arsenite (AsO2) in the layered double hydroxide was confirmed by FT IR and XRD data. Application of Mg-Al-CO3 layered double hydroxide was studied by removing the arsenic ion in the waste water.
Keywords: Mg-Al-CO3 LDH, structural memory effect, anion-exchange, waste water
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