Swelling high-charged micas with design colloidal stability

Significance 

A good number of processes today whether industrial, environmental or geochemical depends on the stability of colloidal clay minerals in one way or the other. As such, a new class of synthetic swelling micas has been synthesized to meet the high growing demands, especially in environmental protection through decontamination of hazardous cations owing to their superiority over natural clay minerals. This has also been escalated by the recent developed policies and regulation to mitigate pollution and global warming. Consequently, recent studies have shown that organoclays based hydrophobic materials exhibit excellent adsorbents properties especially for organic pollutants and thus can also be used for decontamination processes.

Alternatively, the capacity to use particular minerals for particular applications is determined by the surface properties of such minerals. Whereas some properties are easy to investigate and determine, others are quite complex and thus require sophisticated techniques. To this end, despite the remarkable applications of Na-Mica-n especially on the environmental decontamination and protection, little has been reported about their colloidal stability, which is a key consideration in enhancing their effectiveness.

Recently, a group of researchers at the Material Science Institute of Seville (ICMS, CSIC-US) led by Dr. Maria Alba in Spain investigated the colloidal dispersion stability of the swelling high charged micas. They took into consideration the framework and interlayer space composition. Furthermore, they investigated the influence of the hydrophobic nature of the Na-Mica-n surface as well as the nature of the interlayer cations on their colloidal stability. Their research work is currently published in the research journal, Colloids and Surfaces A: Physicochemical and Engineering Aspects.

In brief, the research team explored the potential applications of the interlayer space of swelling 2:1 phyllosilicate and how they can be further advanced. Next, they synthesized the Na-Mica-n micas and then functionalized with ethylammonium. Also, their characteristics in terms of structural, morphological and compositional were examined together with their influence on the stability dispersion. Eventually, they determined the pH range upon which the Mica-n colloids became stable, taking into account their interlayer space composition and total layer charge.

The authors observed that the interlayer cation structural arrangement and the interlayer cation composition were the main factors that influenced the behavior of the colloidal dispersion stability. As such, they further noted that for the swelling high charged micas, their total charge contributed insignificantly to the colloidal dispersion stability.

In summary, the research team at Material Science Institute of Seville was the first to successfully prove the colloidal dispersion stability of swelling high charged micas. To actualize their study, they established a stable pH range for Na-Mica-n. Based on the experimental results, the study will altogether advance the design and synthesis of mica thus improving their effectiveness for the existing applications while at the same time paving way for developing new applications.

Swelling high-charged micas with design colloidal stability - Advances in Engineering

About the author

Dr. María D Alba is a researcher of the Material Science Institute of Seville (ICMS, CSIC-US) and has a researcher and teaching experience of 28 years. She has published 105 articles in SCI journals about the design of materials based on silicates for catalysis and environmental management. Owns 2 patents, and has collaborated with companies with environmental implications.

Since 1994, she has been specialist on Solid State NMR technique and has developed some methodologies for its application to aluminosilicates.

Email: [email protected]

About the author

MsC. Agustín Cota from the X Rays Laboratory (Research and Innovation Center of the University of Seville) obtained his master degree in Materials Science in 2011, supervised by Dr. Alba, focused in the Solution Properties of the System ZrSiO4−HfSiO4. Actually, he is a PhD student on the University of Seville and his research is focused on Chemical Immobilization of Spent Nuclear Fuel by Clays. He has published around 15 peer-reviewed papers, and has 13 communications in international conferences.

Email: [email protected]

About the author

Dr. Mariela Fernández holds a PhD in Biotechnology from Quilmes National University. Her research interest is related to the development of new technologies for water remediation, including adsorption of heavy metals and agrochemicals. The related adsorbents studied were raw, thermal and mechanically treated and nano-clays. She has published eight papers in international peer-reviewed journals as well as two book chapters and more than 30 congress presentations.

Email: [email protected]

About the author

MsC. Francisco J. Osuna from the Material Science Institute (ICMS, CSIC-US) obtained his master degree in Materials Science in 2014, supervised by Dr. Alba, focused in the Cesium immobilization by a family of high charge swelling silicates. Actually, he is a PhD student on the Material Science Institute and his research is focused on the designed functionalization of high charged mica for heavy metals removal. He has published around 10 peer-reviewed papers, and has 5 communications in international conferences.

Email: [email protected]

About the author

Dr. Esperanza Pavón is a researcher of the Material Science Institute of Seville (CSIC-US). She obtained her Ph.D. degree in Materials Science in 2011 focused in the study of the interlayer space of a family of high charge swelling silicates. During her postdoctoral period, she deepened on 1) the Solid State NMR technique applied to the structural elucidation of silicates and fluorine compounds and 2) in the development of new arsenic adsorbents obtained from clay minerals. She has published around 29 peer-reviewed paper, owns 2 patent, and has more than 25 communications in international conferences.

She has been the main researcher of an international research project, has participated in more than 10 research projects and contracts and she is supervising 3 Ph.D. students.

Email: [email protected]

Research ID: E-6336-2010

About the author

Dr. Rosa M. Torres Sánchez received her PhD in Natural Sciences. Currently, she is retired working with a contract as principal researcher at the National Council for Scientific and Technical Research (CONICET) of Argentine. Her research interests focus on the clays and soils characterization, clays application in water and effluent treatments and as agrochemical adsorbents. She teaches several postgraduate courses, published more than 100 papers in international journals peer review, several book chapters, directed several research and technological projects and more than 10 PhD students.

Email: [email protected]

Reference

Osuna, F., Cota, A., Fernández, M., Pavón, E., Torres Sánchez, R., & Alba, M. (2019). Influence of framework and interlayer on the colloidal stability of design swelling high-charged micas. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 561, 32-38.

Go To Colloids and Surfaces A: Physicochemical and Engineering Aspects

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