Cobalt Acid Lanthanum Nano Powder Preparation And Its Photocatalytic Properties

With the rapid development of industry, water damage is becoming increasingly serious, greatly restricting the sustainable development of mankind, so the sewage treatment has become widespread concern. Semiconductor materials can take full advantage of the sunlight to decompose toxic substances in contaminated water without secondary pollution, thus can be an effective environmental management approach. In recent years, improving or developing high activity semiconductor catalytic materials response in the visible-light range to become a research hotspot. This thesis through doping to improve the band structure of the semiconductor material to improve visible light response properties of the catalyst, and combinating material characterization techniques focus on the synthesis and photocatalytic properties of LaCoO3-based semiconductor nanomaterials.The paper studied the influence of the preparation method and calcining temperature on LaCoO3powder synthesis and photocatalytic properties. The results show that powders synthesized by citric acid-Hydrothermal method have the highest efficiency of the degradation of malachite green solution, and powders sintered at750℃/2h have highest photocatalytic activity, the maximum photocatalytic degradation of15mg/L malachite green could be achieved with a degradation degree of94%for60min.In order to further improve the photocatalytic properties of LaCoO3, doping its A-site with Ba ion in different proportions, and using citric acid-Hydrothermal method to synthesize La1-xBaxCoO3series powder catalysts, and analyzed influence of the catalytic properties of lanthanum cobaltate with different Ba dopingratio. The results show that the maxmum degradation rate of the solution was95.7%for60min with x=0.2, and the degradation of malachite green solution in the visible-light is higher than UV lamp. The catalytic properties of lanthanum powders under different light sources were higher than the catalytic performance of nano-TiO2powder catalysts, and the lanthanum powders have good recycling performance.