A new method for preparing microporous titanium pillared clays

Titania-Clay Mineral Composites for Environmental Catalysis and Photocatalysis

The use of titania-based composite materials in the field of heterogeneous catalysis and photocatalysis has a long and rich history. Hybrid structures combining titania nanoparticles with clay minerals have been extensively investigated for nearly four decades. The attractiveness of clay minerals as components of functional materials stems primarily from their compositional versatility and the possibility of using silicate lamellae as prefabricated building blocks ready to be fitted into the desired nanoconstruction. This review focuses on the evolution over the years of synthetic strategies employed for the manufacturing of titania–clay mineral composites with particular attention to the role of the adopted preparative approach in shaping the physical and chemical characteristics of the materials and enabling, ultimately, tuning of their catalytic and/or photocatalytic performance.

Ti-pillared montmorillonite clay for adsorptive removal of amoxicillin, imipramine, diclofenac-sodium, and paracetamol from water

The adsorptive removal of natural montmorillonite (MMT) clay pillared with titanium oxide (Ti-PILC) was examined in this study to see the adsorptive remove of pharmaceutical compounds (PCs): amoxicillin (AMOX), imipramine (IMP), Diclofenac-Sodium (DIF-S), and paracetamol (PCM) from water under a batch-scale study. The post-intercalation changes in clay were investigated with various surface and structural analysis techniques. The results confirm an increase in the surface area, microporosity, and acidic sites (lewis acid) which improved and regulates Ti-PILC interactions with electron-rich PPCPs molecules. The FTIR bands for Si-OH and Al-OH show a shift in MMT, after pillaring, indicates the intercalation of Ti pillared in its interlayer space. The isotherms studies suggested the best fitting of Redlich Peterson models for all pharmaceutical adsorption data. The Langmuir adsorption (maximum) was recorded for Ti-PILC in the order: 82.68 (IMP) > 23.05 (DIF-S) > 20.83 (PCM) > 4.26 (AMOX) mg.g^-1 at a fixed adsorbent dose i.e. 0.1 g·L^-1. The PCs adsorption kinetics was also evaluated by Pseudo-first-, and second-order model and results showed the best curve fitting for all PCs. Results of regeneration studies showed that modified Ti-PILC could be a low-cost cleaner material for adsorption of pharmaceuticals from water.

Influência de argilas pilarizadas na decomposição catalítica do óleo de andiroba

Amostras de esmectitas oriundas do estado do Pará, região amazônica, Brasil, foram usadas em processo de pilarização no presente estudo. As matrizes pilarizadas e natural foram caracterizadas usando DRX e analise textural usando isotermas de adsorção-desorção de nitrogênio. Os íons de intercalação (Al13, Ti, Zr) foram obtidos através de reações químicas com soluções de AlCl(3)6H2O/ NaOH, etoxido de titânio/HCl, acetato de zircônio / HCl. Os resultados obtidos com o processo de pilarização apresentaram aumento do espaçamento basal de 15,6 para 20, 64 Å e área superficial de 44 para 358 m²/g (Zr-PILC). A estabilidade térmica da argila natural foi melhorada com o processo de pilarização. O material resultante foi submetido a um processo catalítico de decomposição do óleo de andiroba em um reator de leito fixo a 673 ± 1 K. A atividade catalítica foi determinada pelo produto de decomposição resultante da reação química. Os parâmetros físico-químicos foram obtidos usando DRX, FTIR e análise textural. As argilas pilarizadas apresentaram alta acidez de Brønsted, com alta concentração de hidrocarbonetos aromáticos e baixa concentração de hidrocarbonetos alifáticos.