XRD investigations of hydrated homoionic montmorillonite saturated by several heavy metal cations

Oueslati, Walid; Rhaïem, H. Ben; Amara, Abdesslem Ben Haj

doi:10.1016/j.desal.2010.12.018

Cited by 43 publications

(44 citation statements)

References 28 publications

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“…This result is in accordance with the literature [34][35][36]46,47], especially in terms of structural heterogeneities. Indeed, for the Swy-2-Ba sample, and along the dehydration process, the structure is characterized by multiple MLS contributions, including different relative proportions of layer types (0W, 1W, 2W and 3W).…”

Section: Discussionsupporting

confidence: 82%

“…Theoretical XRD patterns are calculated using the algorithms and the Z atomic coordinates of the interlayer space developed by Drits and Tchoubar [35]. The proposed theoretical intensities were calculated according to the matrix formalism detailed by Drits and Tchoubar [35]. The diffracted intensity along the 00l rod of the reciprocal space is given by:…”

Section: Quantitative Xrd Investigationmentioning

confidence: 99%

“…This indirect method consists of an adjustment of the experimental patterns by fitting the positions and profile shapes of 00l reflections over the explored angular range. Theoretical XRD patterns are calculated using the algorithms and the Z atomic coordinates of the interlayer space developed by Drits and Tchoubar [35]. The proposed theoretical intensities were calculated according to the matrix formalism detailed by Drits and Tchoubar [35].…”

Section: Quantitative Xrd Investigationmentioning

confidence: 99%

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Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

2015

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The structural changes along the c axis, of the Ba-exchanged montmorillonite (Swy-2-Ba), under variable relative humidity (% RH), is investigated. In this regard, the arrangement, amount and position of both exchangeable cation and the water molecules in the interlamellar space (IS), are evaluated. This aim is achieved using the X-ray diffraction (XRD) profile modeling approach that consists of comparing experimental and theoretical patterns calculated from structural models. The contributions of the hydration states and the interlayer water amounts, as a function of the % RH, are registered by quantitative XRD investigation. The validated structural models are heterogeneous, suggesting various proportions of layer types at different RH ranges, which means the coexistence of different mixed layer structure MLS packages, exhibiting different proportions of layers with contrasting hydration states. This result is attributed to the orientation of the applied hydration sequence. Indeed, the interlayer water molecule amounts, which led to the appearance of a logic hydration hysteresis, are strongly affected by hydrous perturbation.

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Section: Discussionsupporting

confidence: 82%

Section: Quantitative Xrd Investigationmentioning

confidence: 99%

Section: Quantitative Xrd Investigationmentioning

confidence: 99%

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Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

2015

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“…The application of various alternative materials for sorption or elimination of metals in wastewater has been investigated due to its numerous economic advantages Zola et al, 2012;Oueslati et al, 2011;Torab-Mostaedi et al, 2010;Attia et al, 2010;Yilmaz et al, 2010;Giraldo and Moreno-Piraján, 2008;Novakovic et al, 2008;Stathi et al, 2007;Ouhadi et al, 2006). The cost of clay is relatively low compared to other alternative adsorbents, including activated charcoal, natural and synthetic zeolites, and ion exchange resins.…”

Section: Introductionmentioning

confidence: 99%

Insight of the removal of nickel and copper ions in fixed bed through acid activation and treatment with sodium of clay

Neto

Vieira

Silva

2014

Braz. J. Chem. Eng.

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-The bentonitic clays show good adsorptive characteristics, being used as alternative material for removing metals. This study evaluates several treatments (calcination, acid activation and treatment with sodium) of bentonite type Bofe in the removal of nickel and copper. Analyses were performed for physicochemical characterization of clay using the techniques: X-ray fluorescence (XRF), thermal analysis (TG and DTA), X-ray Diffraction (XRD), the ethylene glycol monoethyl ether (EGME) method, N 2 adsorption (BET) and Scanning Electron Microscopy (SEM). Among the changes induced by acid activation and sodium transformations, the treatment with sodium chloride in fixed bed showed the highest performance in the monocomponent removal of nickel and copper.

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“…It was also observed that the environmental history of the clay samples is important for the detailed behavior displayed by these isotherms. In addition, based on thermogravimetric and differential scanning calorimetry measurements, a complete Ni-fluorohectorite dehydrated state only can be reached at long (several hours) isotherm times at 70 °C, or at shorter times ( , 2010;Ferrage et al, 2005;Ferrage et al, 2011;Oueslati et al, 2011;Tenorio et al, 2010), NMR (Fleury et al, 2013;Tenorio et al, 2008;Tenorio et al, 2010) and molecular dynamics simulations (Ebrahimi et al, 2014;Skipper et al, 1991a;Tambach et al, 2004;Zheng and Zaoui, 2011).Synthetic clay minerals have the advantage that they possess a more homogeneous charge distribution, and also contain significantly fewer impurities (e.g. carbonates, (hydr)oxides, silica, and organic matter) than their natural counterparts (Bergaya and Lagaly, 2013).…”

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confidence: 99%

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Aos meus amados pais Airton e Helena. La filosofia è scritta in questo grandissimo libro che continuamente ci sta aperto innanzi agli occhi (io dico l' universo)Galileo Galilei AgradecimentosAgradeço principalmente, ao meu orientador Prof. Dr. Geraldo José da Silva. A ele quero expressar minhas sinceras gratidões, por todo o suporte aos estudos e pesquisas de meu doutorado. Por sua paciência, motivação, entusiasmo e imenso conhecimento. Sua orientação me ajudou em todo o tempo de pesquisa e escrita dessa tese. Não poderia imaginar ter um melhor orientador e mentor para meu estudo de Doutorado.Meus sinceros agradecimentos ao Prof. Jon Otto Fossum, Ph.D., por oportunizar a realização de meu Doutorado Sanduíche na NTNU, e por me oferecer contribuições em diversos projetos.Além do meu orientador, gostaria de agradecer aos demais componentes da minha banca: Prof. Dr. Jérôme Depeyrot, Profa. Dra. Alexandra Mocellin, Prof. Dr. Luciano Ribeiro, Prof. Dr. Leandro Felix e Prof. Dr. Ricardo Gargano, por seus comentários e questões.Um agradecimento especial ao Leander Michels que me incentivou desde o início do meu doutorado, me ajudou nas disciplinas, me acolheu na Noruega, contribuiu com todos os meus trabalhos. Enfim, por sua amizade! Agradeço aos meus colegas de laboratório e grandes amigos Mario Altoé e Cyntia Larisse.Agradeço também ao Prof. Dr. Roosevelt Droppa Jr. por todas as discussões e contribuições oferecidas nos últimos quatro anos.Aos colegas/amigos de disciplinas do doutorado Luiz e Luciano que tanto me ajudaram.Aos meus roommates #ehdokks durante o Sanduíche Jhowricardo, Jhowluiz e Jhowthiago.Aos amigos Turista e Will.Aos colegas de laboratório e também amigos Zbigniew Rozynek e Alexander Mikkelsen.Às que me deram condições iniciais durante o início do Sanduíche Andrea e Marianne.Agradeço a todos envolvidos direta e indiretamente ligados à realização deste Doutorado.Um agradecimento especial ao LNLS através da equipe formada pela Cristiane, Leide, Fabio, Simone e outros.À profa. Heloísa Bordallo por me convidar a participar de um congresso em sua universidade.Ao prof. Arne Torbjørn Skjeltorp por também me convidar a participar de diversos congressos.Agradeço a Capes pela concessão de minha bolsa de Doutorado durante todo o período no Brasil e ainda a bolsa de Doutorado Sanduíche no Exterior.Ao meu irmão de colete, Thyagão por toda a ajuda com seu refinado inglês! À tia Preta e ao tio Neno! Obrigado pelo carinho e apoio! Aos meus padrinhos por sempre me apoiarem e me acolherem nos finais de semanas de medidas no Síncrotron.Aos meus colegas da COAVED pelo incentivo e solidariedade.Por último, mas não menos, gostaria de agradecer a minha família: meus pais Airton e Helena, por me guiarem até aqui com tanto amor; e meu irmão Guilherme por todo apoio incondicional. ResumoNessa tese foram realizados estudos de difração de raios-X para investigar processos de troca catiônica do íon Li + para Ni 2+ , e vice versa, bem como de Li + para Na + , confinados na argila mineral sintética Fluorohectorita em suspensões aquo...

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XRD investigations of hydrated homoionic montmorillonite saturated by several heavy metal cations

Cited by 43 publications

References 28 publications

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

Insight of the removal of nickel and copper ions in fixed bed through acid activation and treatment with sodium of clay

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