The Effects of Sulfate Anion Exchange on Structural Feature and Thermal Behavior of Y₂(OH)₅NO₃•nH₂O Layered Hydroxide Nanosheets

Abstract:

Layered rare-earth hydroxide nanosheets (3-8 nm thick) of Y₂(OH)₅NO₃·nH₂O (NO₃^--LYH) were successfully synthesized in one step via chemical precipitation at ~4 °C and pH ~8, using yttrium nitrate and ammonium hydroxide as reagents. The interlayer NO₃^- was found to be free ions and can be completely replaced with SO₄^2- to yield Y₂(OH)₅(SO₄)_0.5·nH₂O (SO₄^2--LYH). Thermal decomposition behavior of the SO₄^2--LYH was studied in detail, and the phase and morphology evolutions upon calcination in the temperature range 500-1100 °C were also investigated. Characterizations via XRD, FE-SEM, TEM, and FT-IR found that anion exchange did not bring about any appreciable change to the 2-dimensional crystallite morphology but the basal spacing of the crystal structure shrank from ~0.884 to 0.840 nm owing to the indirect coordination of SO₄^2- to the Y³⁺ ions. DTA/TG and XRD analysis found that the NO₃^--LYH converts to Y₂O₃ at ~600 °C, but the SO₄^2--LYH decomposes to oxide at a higher temperature of ~1000 °C via monoclinic Y₂O₂SO₄ in the range of 800-900 °C. The resultant Y₂O₃ particles have an average size of ~60 nm.

• Periodical: Key Engineering Materials (Volume 633)
• Pages: 204-209
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.633.204
• Online since: November 2014
• Authors: Wei Gang Liu, Xiao Li Wu, Qi Zhu, Ji Guang Li*, Xu Dong Sun
• Keywords: Anion Exchange, Layered Hydroxide Nanosheets, Structure, Thermal Decomposition

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