The Synthesis Of Semiconductor Oxide And Their Application In Organic Contaminants Treatment

With the continuous development of the industrial society and the ceaselesslyquality of people’s living standards, environmental pollution of liquid and gas organiccontaminants has gradually caused the great attention to almost people. How to choosereasonable and effective methods to deal with the environmental pollution has becomeone of the most topic environmental protection problems. Gaseous organic compoundscan be treated with the analysis of gas sensor while the success of liquid organicpollution treatment method is mainly used with photocatalytic oxidation method andadsorption method. In the research of all kinds of functional materials, metal oxidesemiconductor is considered to be a higher application value in the photocatalyticoxidation, adsorption and gas sensors due to its electronic structure diversity and metalion valence variability.This dissertation focuses on synthesis and applications of metal oxidesemiconductor functional materials. On one hand, development of simple andcontrollable methods to achieve a specific crystal phase, size and morphology of metaloxide；on the other hand, to explore higher applications of oxide semiconductormaterials in photocatalytic degradation, adsorption and gas sensor.The main research contents are as follows:1. A simple solvent thermal method has been designed to synthesize round tipsα-Bi2O3microrods in the presence of surfactant dodecylamine (C12H27N). Different(ethanol and ethanol-water) systems have been carried out to explore the ifluence onstructure, size and morphology. The morphology of samples changed from irregularshape to regular round tips microrods with the growth of the reaction time inethanol-water system, while the size of samples were different under the conditions ofdifferent surfactants. Exploring the function of α-Bi2O3material such as structure,morphology and its relationship between photocatalytic degradation activity throughthe degradation of methyl orange (MO) under visible-light irradiation.2. Semiconductor α-MnO2hierarchical hollow microspheres constructed withnanotubes have been facilely synthesized through a bubble template-basedself-scrolling solution route. The morphology and structure of samples areone-dimensional hollow nanotube without reactant H2O2. Exploring the relationshipsbetween the morphology and structure of hierarchical hollow microsperes MnO2andadsorption properties through the experiment of the manganese dioxide adsorption ofCongo red.3. A facile microwave-assisted hydrothermal synthetic route has been successfullydeveloped to prepare CuO microspheres in the presence of poly (vinyl pyrrolidone)(PVP). CuO microspheres constructed through a self-assembly certain rules with thegrowth of nanoparticles along a direction perpendicular. A morphology transformationfrom microspheres to octahedral morphology and dumbbell-shaped microcrystals is confirmed by concisely controlling the amount of surfactant PVP (themorphology changed from dandelion-like structure to octahedral with sharp cornersand well-defined edges) and the reaction time (part of the octahedral structuregradually transformed into a dumbbell shape structure).The gas-sensing properties ofthe synthesized CuO microspheres to organic compounds (ethanol and methanol)exhibit unique superior sensitivities and potential application value.