Synthesis of Nanosized Pseudoboehmite and γ-Al₂O₃ by Control Precipitation Method

Abstract

Nanosized pseudoboehmite particles were synthesized by the precipitation of sodium sulfate and ammonia in aqueous solution at 70°C. After calcinations, the pseudoboehmite could successfully transfer to γ-Al2O3 nanoparticles while retaining their previous morphology. The influence of the reaction conditions on formation of pseudoboehmite and γ-Al2O3 had been researched in detail. The X-ray diffraction analysis showed that nanosized crystalline pseudoboehmite was formed at pH 8-8.5 after ageing 2 hours. Utilization of surfactant(PEG1000) would produce finer nanoparticles with well-dispersion. With the ageing time or the surfactant amount increasing, the morphology of the resulting particles transformed from spherical to fibrous

Synthesis of transparent dispersions of aluminium hydroxide nanoparticles

“…In addition, they can be also adopted as adsorbents to treat acidoids, thus providing cost-effective solutions to environmental problems [24]. Presently, the commonly used preparation methods for ATH nanoparticles are hard to achieve ATH nanoparticles with good dispersity or even monodispersity [25,26]. Therefore, it is of great significance to develop a facile method to prepare transparent dispersions of monodisperse ATH nanoparticles.…”