Synthesis and Characterization of Co - Hydrotalcite - Like Compounds

Hesiquio-Garduño, Miguel; Zeifert, Beatriz; Salmones, J.; Reza, Hosseini Seyed

doi:10.4028/www.scientific.net/jmnm.20-21.257

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Hydrotalcites-like compounds (HT) were synthesized considering the techniques reported by López-Salinas et al (24) and Hesiquio-Garduño et al (25) as follows: two mixed aqueous solutions, the first one composed of M(NO 3 ) 2 and Al(NO 3 ) 3 , and the second of KOH and K 2 CO 3 were added to hot deionized water (333 K) maintaining a M 2þ :Al 3þ ratio of 2:1. The pH during reaction was around 10 and it was controlled using KOH and K 2 CO 3 .…”

Section: Methodsmentioning

confidence: 99%

Fluoride Removal from Aqueous Solutions by Magnesium, Nickel, and Cobalt Calcined Hydrotalcite‐like Compounds

Jiménez‐Núñez

Olguín

Solache‐Ríos

2007

Separation Science and Technology

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Magnesium, nickel and cobalt hydrotalcite-like compounds (MgHT, NiHT, and CoHT), with similar M 2þ :Al 3þ ratios were synthesized and characterized by XRD. It was confirmed from XRD that the materials have hydrotalcite-like structure. MgHT, NiHT, and CoHT were calcined and treated with fluoride solutions in a batch system. F 2 ions were determined in the remaining solutions using a fluoride ion selective electrode. The kinetics of the fluoride ions sorption on calcined hydrotalcite-like compounds (CHT) was best described by the pseudo-second order model and the equilibrium was reached in less than 300 minutes in all cases (MgCHT, NiCHT, and CoCHT). The sorption isotherms of the fluoride by hydrotalcite like compounds can be explained by the Langmuir-Freundlich model and, the highest fluoride sorption capacity was obtained for NiCHT (1.202 mgF/gCHT). The fluoride removal from aqueous solutions by calcined hydrotalcite-like compounds depends on the adsorption properties of the thermal decomposition products and the regeneration reaction mechanism of the hydrotalcite-like compounds.

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Section: Methodsmentioning

confidence: 99%

Fluoride Removal from Aqueous Solutions by Magnesium, Nickel, and Cobalt Calcined Hydrotalcite‐like Compounds

Jiménez‐Núñez

Olguín

Solache‐Ríos

2007

Separation Science and Technology

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Cu hydrotalcite-like compounds: Morphological, structural and microstructural properties

Suárez

Zeifert

Garduño

et al. 2007

Journal of Alloys and Compounds

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Síntese de hidróxidos duplos lamelares do sistema Cu, Zn, Al-CO3: propriedades morfológicas, estruturais e comportamento térmico

Santos

Corrêa

2011

Cerâmica

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ResumoHidrotalcitas são argilas aniônicas, também conhecidas como Hidróxidos Duplos Lamelares (HDLs) e possuem estrutura semelhante ao mineral brucita. Os HDLs do sistema Cu, Zn, Al-CO 3 foram sintetizados em condições que favorecem a formação de cristais pequenos e de elevada área superfi cial. A caracterização foi feita por difração de raios X, análise termogravimétrica, espectroscopia na região do infravermelho e microscopia eletrônica de varredura. A síntese foi feita pelo método de coprecipitação em pH variável, utilizando sulfatos de cobre e zinco, soluções de alumínio e solução de hidróxido sódio. Os difratogramas de raios X mostram que os compostos sintetizados possuem alta cristalinidade; a intensidade e a largura dos picos comprovam que os materiais se apresentam bem organizados e com empilhamento das lamelas. Os espectros de infravermelho apresentaram bandas associadas ao ânion carbonato presente na região interlamelar dos HDLs. Palavras-chave: hidróxidos duplos lamelares, hidrotalcitas, argilas aniônicas. Abstract Hydrotalcite-like compounds are anionic clays, also known as layered double hydroxides (LDH),

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Synthesis and Characterization of Co - Hydrotalcite - Like Compounds

Cited by 3 publications

References 7 publications

Fluoride Removal from Aqueous Solutions by Magnesium, Nickel, and Cobalt Calcined Hydrotalcite‐like Compounds

Fluoride Removal from Aqueous Solutions by Magnesium, Nickel, and Cobalt Calcined Hydrotalcite‐like Compounds

Cu hydrotalcite-like compounds: Morphological, structural and microstructural properties

Síntese de hidróxidos duplos lamelares do sistema Cu, Zn, Al-CO3: propriedades morfológicas, estruturais e comportamento térmico

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