One-dimensional MgAl–CO3 layered double hydroxide (LDH) nanobelts were synthesized by a hydrothermal method in an aqueous solution system without templates. The study showed that the reaction time, reaction temperature, and aging process were the key factors for obtaining LDH nanobelts. Hydrothermal reaction at 60 °C for 48 h favored the growth of nanobelts of width 50–150 nm and length 1000–2000 nm. The nanobelts had the characteristic structures of CO32− intercalated LDHs. Moreover, a tentative mechanism was proposed to explain the evolution of nanobelts in the present system.
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