The Synthesis And Characterization Of Nano-aluminum Compounds

Rencently, World-Health Organization call on investigating the biomechanism of the ultrafine particles, especially the nanoparticles. Researchers have paid their attention to safety and toxicity of different kinds of nanoparticles all over the world which have been reported by Science and Nature. The nano-aluminum oxides and hydroxides is probably the real species under the physiological condition in biological and environmental systems and may also exsit in water, soils, plants and animals. They are important model substrates for surface reactions, having been widely used as sorbents in numerous organic ligands sorption studies of importance in geochemistry and soil science. The adsorption of organic molecules on nano-aluminum oxides and hydroxides is generally thought to change the characteristics of colloidal mineral particles and thus can substantially alter the sorption capacity of metal(oxy)hydroxide minerals, making them to be potentially environmental regulators of heavy metal contaminants. However, our understanding of the NAD+ adsorbed on nano-aluminum oxides and hydroxides has never been reported in the available literature. to investigate interactions between nano-aluminum oxides and hydroxides surfaces and NAD+ by providing detailed molecular-level information about the coordination and structure of the adsorbed surface complexes, and to further understand the physiological and biochemical mechanism of nano-aluminum oxides and hydroxides under the physiological condition. In this paper, nano-aluminum (hydr) oxides are synthesized at first, then investigate interactions between nano-aluminum oxides and hydroxides surfaces using UV-vis and ATR-FTIR spectroscopy. The main research works are described as follows:1,Characterization,application and synthesis methods of Al2O3,AlOOH and Al13 were introduced. Hydrothermal method was introduced in the preparation of nano-sized AlOOH by using AlC13·6H2O,NaOH,CTAB or Al(NO3)3·9H2O,urea as raw materials. XRD,SEM and TEM were used to characterize nano-sized AlOOH. The results indicated that the 13nmγ-Al2O3 and the 20nmα-Al2O3 powders were attained by the calcinations of the precursors at 500℃and 1000℃respectively, and the 30nm AlOOH powders were attained. Separation and purification of Al13 species in polyaluminum chloride by chemical precipitation and metathesis,and nano- sized Al13 sulfate was characterized by XRD,SEM,AFM and 27Al NMR.Results showed that the spherical particles synthesized were Al13 sulfate with diameters about 80nm. 2,The adsorption of NAD+ on two crystallized nano-aluminum oxides boehmite (AlOOH) and corundum (γ-Al2O3) was investigated using batch adsorption experiments and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy over a range of different NAD+ concentrations (0-6.25 mM), pH conditions (3-11) and ionic strength conditions(0.01-1.25M KCl). The results of the batch adsorption experiments showed that at both pH 5 and 7, nano-AlOOH and nano-y-Al2O3 exhibited great adsorption capacity and the adsorbed amount of NAD+ exhibited a strong dependence on pH. The adsorption was at a maximum at low pH and decreased as pH was increased. For both nano-AlOOH and nano-y-Al2O3, a common feature was that the ligand adsorption displayed strong ionic-strength dependence, in situ ATR-FTIR spectral features of adsorbed NAD+ were very similar to those measured for NAD+ in aqueous solution. These observations suggested that NAD+ was predominantly adsorbed at the nano-aluminum (hydr) oxides/water interface in an outer-sphere fashion.