Synthesis of 3R₁and 1H Polytypes of Sulfate-Intercalated Layered Double Hydroxides (LDHs) by Postintracrystalline Oxidation and Simultaneous Intercalation-Oxidation of Thiosulfate

Abstract

Well ordered 3R 1 polytypes of sulfate-intercalated Zn−Al and Zn− Cr LDHs could be synthesized at room temperature by intracrystalline oxidation of thiosulfate-intercalated LDHs by hydrogen peroxide. When the intercalationoxidation sequence was slightly modified in such a way that the intercalation and oxidation of thiosulfate took place simultaneously, 1H polytypes were formed. The formation of these polytypes is confirmed by simulation of powder X-ray diffraction patterns and phase transformation on heating. Interestingly, the two polytypes show different anion exchange behavior.

Morphology controlled growth of ZnAl-layered double hydroxide and ZnO nanorod hybrid nanostructures by solution method

“…006) reections of a crystalline ZnAl-LDH phase with R 3m rhombohedral symmetry. 33 The presence of ( 003) and (006) reections conrms the layered structure of the ZnAl-LDH materials. With increasing the ZnO layer thickness, ZnAl-LDH diffraction peaks are signicantly reduced, and another phase was detected in the XRD spectra.…”

Synthesis and reversible hydration behavior of the thiosulfate intercalated layered double hydroxide of Zn and Al

“…Despite its importance, there are only a few reports of thiosulfate intercalation into the LDH gallery. Thomas et al [14,15] report the synthesis of thiosulfate-LDH by anion exchange and study the intracrystalline oxidation of thiosulfate in the interlayer using H 2 O 2 and I 2 to derive sulfate-LDHs devoid of carbonate contamination. Different conditions yield different polytypes of the sulfate LDH.…”