Synthesis, characterization, and challenges faced during the preparation of zirconium pillared clays

Tanya Chauhan, Mahitha Udayakumar, Mohammed Ahmed Shehab, Ferenc Kristály, Anett Katalin Leskó, Martin Ek, David Wahlqvist, Pál Tóth, Klara Hernadi, Zoltán Németh

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

In this study, Zr-pillared montmorillonite clays (Zr-PILCs) were synthesized using two different precursor materials: raw montmorillonite (CM) and sodium ion-saturated montmorillonite (Na-CM) at different Zr/clay ratios (2.5, 5 and 10 mmol/g). To study the effect of Zr concentration and clay pre-treatment with NaCl on pillaring, the modified clay samples were characterized in detail using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy (STEM-EDX). The XRD analysis showed the increase of basal spacing of Zr-PILCs prepared from both precursor materials: from 1.26 to 1.74 nm in the case of CM, and from 1.13 to 1.93 nm for Na-CM. Results from FT-IR revealed new bands ascribed to Zr-O bonds in the range of 400–500 cm−1 in Zr-pillared samples obtained from Na-CM at Zr/clay ratios of 2.5 and 5 mmol/g. The distribution and nature of Zr species in between the silicate layers were studied using STEM-EDX and HAADF imaging. They were found to be separated by a distance of 1.5–3 nm and their thickness lies in the range of 1–2 nm. Pillared clays prepared from pre-treatment with NaCl were more thermally stable at higher temperatures.
Originalspråkengelska
Artikelnummer103706
Antal sidor10
TidskriftArabian Journal of Chemistry
Volym15
Nummer4
Tidigt onlinedatum2022 jan. 21
DOI
StatusPublished - 2022 apr. 1

Ämnesklassifikation (UKÄ)

  • Nanoteknik

Fria nyckelord

  • Montmorillonite
  • Zr-PILCs
  • Pillaring
  • Sodium-saturated montmorillonite
  • Specific surface area
  • Basal spacing

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