光催化还原去除六价铀污染非金属光催化材料制备与性能研究

发布时间：2018-05-14 00:30

本文选题：光催化 + UO_2~(2+)还原　；参考：《东华理工大学》2017年硕士论文

【摘要】：核工业的发展促进了人类社会的巨大进步,与此同时也产生了大量的核废料六价铀,对人类健康和生态环境带来极大的危害,是人类迫切需要解决的重大环境问题。本论文研究光催化还原技术还原去除六价铀污染。本论文研究了硼掺杂g-C_3N_4和石墨烯型碳材料-碳纳米笼作为半导体光催化还原六价铀污染,我们以硼酸和硫脲为前驱体,通过热聚合法,一步制备硼掺杂g-C_3N_4光催化材料;以苯为前驱物,通过化学气相沉积法,制备得到石墨烯型碳纳米笼光催化。论文中,我们研究了硼的掺杂形态和含量对g-C_3N_4基光催化材料的可见光的吸收、价带和导带电位、光电子迁移和利用效率的影响,于此同时,我们也研究了碳纳米笼制备温度对碳纳米笼光学性质、电学性质以及电子结构的影响,确定硼掺杂g-C_3N_4和碳纳米笼光催化材料表面电子结构与光催化还原六价铀性能之间的定性、定量关系,揭示了光催化机理,为新型高效光催化还原去除六价铀催化剂的设计与开发提供依据。
[Abstract]:The development of nuclear industry has promoted the great progress of human society. At the same time, it has also produced a large amount of nuclear waste hexavalent uranium, which has brought great harm to human health and ecological environment, and is an important environmental problem urgently needed to be solved by human beings. In this paper, the photocatalytic reduction technology for the removal of hexavalent uranium pollution is studied. In this paper, boron doped g-C_3N_4 and graphene carbon nano-cage were used as semiconductor photocatalytic reduction of hexavalent uranium contamination. Boric acid and thiourea were used as precursors to prepare boron doped g-C_3N_4 photocatalytic materials by thermal polymerization. Graphene carbon nanocage photocatalysis was prepared by chemical vapor deposition with benzene as precursor. In this paper, we studied the effects of boron doping morphology and content on visible light absorption, valence band and conduction band potential, photoelectron transport and utilization efficiency of g-C_3N_4 based photocatalytic materials. We also studied the effects of preparation temperature on optical, electrical and electronic properties of carbon nanocage, and determined the relationship between the surface electronic structure of boron doped g-C_3N_4 and carbon nano-cage photocatalytic materials and the photocatalytic reduction of hexavalent uranium. The quantitative relationship reveals the photocatalytic mechanism and provides the basis for the design and development of a new type of highly efficient photocatalytic reduction catalyst for removal of hexavalent uranium.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36

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