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Morphology-controlled Synthesis of Bi2S3-based Photocatalysts and Their Photocatalytic Performance

Author: HuangJing
Tutor: ZhongXinHua
School: East China University of Science and Technology
Course: Applied Chemistry
Keywords: Bi2S3 nanostructures Morphology Control Bi2S3-TiO2 heterostructures Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 26
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Abstract


Semiconductor Nanocrystals as a photocatalyst has a very important role in the field of wastewater treatment . In this thesis, major research Bi2S3 nanostructures and Bi2S3-TiO2 heterostructure morphology control synthesis , and their photocatalytic properties . The first chapter of Semiconductor heterogeneous photocatalysis basic theory and photocatalyst Bi2S3 nanostructures progress . The second chapter introduces Bi2S3 Nanostructures of different dimensions and performance of photocatalytic degradation of three typical dye . This experiment using a single precursor Bi ( S2CNEt2 ) 3 in the thermal decomposition of the organic amine to give a high quality of Bi2S3 nano dots , nanorods, and dispersed monocrystalline nanosheet . Bi2S3 nanorods and nanosheets are found through further study of the structure from the self-assembly of nanodots and nanorods , and adhesion on this basis - recrystallization growth mechanism . In the photocatalytic these three kinds nano crystal can be selective photodegradation of Rhodamine B, three methylene blue and methyl orange dye , and the different dimensions Bi2S3 nanostructures catalytic activity . Bi2S3 in the visible light catalytic efficiency , the third by the hydrothermal method easily synthesized Bi2S3-TiO2 heterostructures . Experimental conditions have a significant impact on the structure and morphology of the product . Experimental parameters to optimize the concentration of bismuth source , titanium source with bismuth source concentration ratio and acetone content , we identified Bi2S3 nanorods TiO2 nanoparticles load rate , and Bi2S3-TiO2 heterogeneous structure of the catalytic properties of the optimal experimental condition. At the same time , through the comparative study Bi2S3-TiO2 heterostructures , Degussa P 25 the blank TiO2 and Bi2S3 mechanical mixture of both in the catalytic activity under visible light , we found Bi2S3 and TiO2 synergy prompted on the transfer of the electron - hole Bi2S3-TiO2 heterojunction structure , so that the excellent catalytic performance .

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