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Structural Analysis of Magnesium-Aluminium Hydrotalcites Modified with Iron III Obtained by Hydroxide Precipitation Method

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Materials Sciences and Applications 2017年第11期8卷 784-797页

作者： Graciele Vieira Barbosa Maria Aparecida Zaghete Rafael Aparecido Ciola Amoresi Margarete Soares da Silva Alberto Adriano Cavalheiro Rogério Cesar de Lara da Silva CDTEQ—centro de desenvolvimento de Tecnologias Químicas Universidade Estadual de Mato Grosso do Sul Navirai Brazil CDMF—centro de desenvolvimento de materiais Funcionais Universidade Estadual Paulista Araraquara Brazil cepemat—centro de pesquisas em materiais Universidade Estadual de Mato Grosso do Sul Dourados Brazil

Hydrotalcite-type anionic clays are a group of important materials used in adsorption processes, mainly for organic pollutants removal due the layered double hydroxide structure. The layer-interlayer interactions provide a structural memory even after dehydration and dehydroxylation process, since a very stable interlayer anions are part of material composition, like the carbonate one. A limited numbers of trivalent modifier cations can replace the aluminium cation due the ionic radii mismatch or oxidation state restrictions. Transition metal cations can replace the aluminium one in octahedral site of hydroxide lamellas in order to improve the adsorptive behaviors. In this work, we have investigate three compositions of carbonated magnesium-aluminium hydrotalcite with dif-ferent iron (III) contents through the co-precipitation method at pH 11 and aging step at 60°C for 6 hours. Thermal analysis was performed aiming the determination of the hydration water and hydroxyl amounts in dried precipitate samples, taking in account the results obtained for X-ray diffractometry, infrared spectroscopy, and nitrogen adsorption-desorption characterization for several thermally treated samples. All of synthesized samples showed high surface areas, even for high temperature of thermal treatment. The co-substitution with iron (III) reduced the temperature of dehydration and dehydroxylation process, but the co-substitution at 5 mol% provides other desirables characteristics, like a more amount of rhombohedral HDL phase and higher porosity, even after the thermal treatment at 500°C for 4 hours. This result makes that composition very applicable as a reusable adsorbent material in order to removal several types of micro-pollutant compounds in aqueous media.

关键词： Hydrotalcite Layered Double Hydroxide Hydroxide Precipitation Iron (III)

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