Solution-systhesis And Photocatalytic Property Studies Of Bismuth Based Nanomaterials

Synthesis and application of Bi based nanomaterials have attracted greatinterests in recent years. Because of their special properties, Bi based nanomaterialshave been widely used in very broad areas such as catalysis, information storage,fabrication of nanoscale devices, optoelectronics.In this thesis, Bi based nanomaterials with different morphologies includingbundle-like structure, nanoplate and nanoparticle were successfully prepared via asimple liquid-phase synthesis method. The morphology of Bi based nanomaterialscan be adjusted by changing bismuth sources, surfactants, alkalinity and so on.What’s more, the products will be used for photocatalytic degradation of RhB. Thethesis consists of three parts:First,3D bundle-like Bi based nanostructures with tunable morphologies wereobtained with bismuth nitrate, hydrazine hydrate, PVP as bismuth source, reducingagent, surfactant respectively at90oC. Furthermore,we analyzed the possiblemechanism in detail. The morphology of Bi based nanomaterials can be adjusted bychanging the amount of NaOH and reducing agent, the temperature and the type ofsurfactant. In addition, the experiment of photocatalytic degradation of RhB wascarried out with bundle-like and irregular Bi based nanomaterials as catalysts, theexperiments demonstrated that Bi based nanomaterials with bundle-likenanostructure possessed excellent catalytic properties. what’s more, the experimentof photocatalytic degradation of RhB was carried out under different acidcircumstances, we found that by controlling the pH value to some extent, the bundlesample manifested excellent photocatalytic activity under visible light. Furthermore,the3D bundle-like Bi based nanomaterials with excellent cycle characteristics couldbe easily recycled42times under visible light irradiation.Second, Bi nanoplates were successfully synthesized in alkaline solution withbismuth chloride, hydrazine hydrate, sodium oleate as bismuth source, reducing agent,surfactant respectively at90oC. The morphology of Bi nanomaterials can beadjusted by changing the reaction time, the amount of reducing agent, thetemperature and the type of surfactant. What’s more, we discussed the the possiblemechanism of Bi nanoplates. In addition, Bi nanomaterials with differentmorphologies have been used for photocatalytic degradation of RhB. Third, a solution reduction method employed in the synthesis of large quantitiesof nano-sized Bi crystals with various morphologies with N2H4·H2O as reductant inbasic solutions. In addition, the experiment of photocatalytic degradation of RhBwas carried out with the products as catalysts. We found that the productssynthesized in this system possessed moderate photocatalytic activity.