Study On Preparation Of Nano Oxides Of Al, Zn, Mg By Thermal Decomposition Of Their Urea Formaldehyde Resin Polymer Complexes

Based on the extensive uses of the nano oxides such as Al2O3,ZnO and spinel and its composites, the paper studied the urea formaldehyde resin polymers. Unitary binary and ternary metallic complexes were synthesized in-situ respectively. They were urea-formaldehyde resin-aluminum polymer complex, urea-formaldehyde resin-zinc polymer complex, urea-formaldehyde resin-magnesium aluminate dual metal complex and urea-formaldehyde resin-zinc magnesium aluminate ternary metallic complex.The polymer resin complexes were thermal decomposed to get nanometer alumina, nanometer zinc oxide, spinel and zinc/spinel composite.The polymers and their complexes were characterized by IR, TG-DSC and other testing methods. In unitary metal complexes, metal atoms coordinated with nitrogen atom and oxygen atom in the polymer resin. In the three-dimensional chain, each chain unit can be written as-C3ON2H4-. Every 5-7 chain units have one bonding Al or Zn atom on average. This may relate to experimental conditions and the polymer lumen was difficult of acess by Al atom or Zn atom.The study of polymer precursors thermally decomposed into nanometer alumina which phase transformation after treatment under different temperature is gamma-Al2O3, theta-Al2O3 and alpha-Al2O3. The ultraviolet absorption spectrum of alumina indicated that the absorbance of nano alumina is decreased in ultraviolet light; the spinel and zinc oxide/spinel composite were thermally decomposed from binary and ternary metallic complexes.The solid ultraviolet spectrum study of the two substances is that there is a weak absorption band in visible light. This maybe because of the interaction between spinel and zinc oxide/spinel which has certain directive significance in optical materials research; Hexagonal column zinc oxide nanorods were thermally decomposed from polymer precursors, and it has strong absorption in ultraviolet band. Fluorescence probe found that improving calcining temperature the exitation peak of Zno had bathochromic shift.We studied the photocatalytic degradation performance of nano zinc oxide. We found that particle size and morphology has greate influnce on photocatalytic degradation effects.The smaller partical size the higher specific surface area and stronger adsorption capacity the better adsorption capacity.The photocatalytic degradation of methylthionine chloride consequence is that the nano zinc oxides calcined under 500℃and 700℃are the best. The degradation rate is almost 100%. It may become the better photocatalyst in the organic wastewater treatment.