Study On The Preparation And Properties Of ALOOH Nano Powder Of Controllable Morphology

Recently, Al2O3-based materials have extensively received much attention and are widely applied in the fields of catalysts, catalyst supports and adsorbents,functional materials, photoelectronic materials, biomedical materials, etc, due to their excellent properties, such as nanometer effect, low melting point, large specific surface area, stable chemical and thermodynamic performance, and low cost, and so on. To date, many efforts have been attempted to synthesis Al2O3-based catalyst composite materials with various excellent properties via controlling the morphologies, sizes and distributions.(1) Flower-like γ-Al OOH with high crystallinity, narrow diameter desperation and uniform morphology has been synthesized successfully via traditional hydrothermal process, using aluminium sulphate, urea, cetyltrimethyl ammonium bromide(CTAB) and sodium tartrate as the sources, and the formation mechanism of the as-prepared flower-like nanostructural samples is expected. Meanwhile, the effects on the morphology and crystallinity of additive amounts of the different sources were studied to lay the foundation of synthesis Al2O3 microspheres precursor materials. The adsorption property of the flower-like γ-Al OOH for the methyl orange solution was observed to estimate the adsorption activity on pollutant in wastewater at room temperature.(2) The researches results show that, the suitable addition amount of sodium tartrate could be used to synthesize microspheres γ-Al OOH with high crystallinity, and the formation mechanism of the samples with microspheres nanostructure was expected. After series of experiments, the optimum additive amounts of the different sources for microspheres Al2O3 precursor were determined. This measurement could lay the solid foundation for the synthesis hollow-like microspheres Al2O3 precursor. The adsorption experimental results show that microspheres γ-Al OOH exhibits enhanced adsorption ability than that of the flower-like γ-Al OOH.(3) The hollow-like microspheres Al2O3 precursor has been successfully synthesized by selecting the sodium citrate as the new templates. After series of the experiments, the optimum additive amounts and hydrothermal temperature was determined, and the formation mechanism of the samples with hollow-like microspheres nanostructure was expected. Finally, the adsorption ability of the hollow-like microspheres Al2O3 was evaluated by observing the adsorption rates for methyl orange solution. Due to the unique hollow structure and large specific surface area, the hollow-like spherical Al2O3 would possess extensively prospects in the field of catalyst supports.(4) Rodlike Al2O3 precursor with high crystallinity has been synthesized via traditional hydrothermal method, using aluminium nitrate, urea and polyethylene glycol(PEG) 2000 as the source. The formation mechanism of the samples with rob-like nanostructure was also expected. After studying the effect of addition amount of PEG 2000 on the Al2O3 morphology, the optimum additive amounts for rod-like Al2O3 were confirmed. Furthermore, the adsorption ability of the rod-like Al2O3 for methyl orange was observed.