【作者】 张薇；

【导师】 杨志；

【作者基本信息】 上海交通大学 ， 电子科学与技术， 2017， 硕士

【摘要】 随着环境污染和能源短缺日渐严重,扩展催化剂的光反应范围以有效利用清洁能源太阳能来治理环境问题逐渐成为研究热点。氧化亚铜（Cu₂O）作为窄带隙的p型半导体在光催化领域得到了广泛的应用,为了提高氧化亚铜的光催化活性,本论文以氧化石墨烯为载体通过一步原位还原法制备了不同形貌的氧化亚铜-石墨烯纳米复合体系并研究了其在可见光下的催化性能,主要内容如下:（1）通过湿化学还原法可控制备立方体和八面体氧化亚铜,制备的粒子形貌规则且大小均一,二者的平均粒径分别为800 nm和700nm。以氧化石墨烯为载体,通过原位还原法制备立方体和八面体氧化亚铜-石墨烯纳米复合体系,复合后氧化亚铜粒径明显变小,平均粒径分别为300 nm和250 nm。通过研究反应物剂量、反应温度和反应时间等实验条件对复合产物的影响,确定了最优的制备方案。（2）研究了立方体和八面体氧化亚铜-石墨烯纳米复合体系在可见光下对甲基橙的降解能力,其中八面体氧化亚铜-石墨烯纳米复合体系具有最佳的光催化活性,降解速率为82.88×10^-3 min^-1。同时进行了光催化机理分析实验,探索性地提出了复合协同效应的机理。本论文的创新点在于,通过优化实验参数,得到了最优的复合体系的制备方法,制备的氧化亚铜-石墨烯纳米复合体系具有很好的可见光催化活性,同时第一次系统地提出了石墨烯与氧化亚铜复合协同效应提高光催化活性的机理。更多还原

【Abstract】 With the environmental pollution and energy shortage becoming more and more serious,extending the range of photocatalytic reaction to the effective use of clean solar energy to solve environmental problems has gradually become a research hotspot.As a narrow bandgap p-type semiconductor,cuprous oxide（Cu₂O）has been widely used in photocatalysis.To improve the photocatalytic activity of Cu₂O,in this paper,we used graphene oxide as the carrier to prepare cuprous oxide-reduced graphene oxide（Cu₂O-RGO）nanocomposite systems with different morphologies and further investigate their photocatalytic properties under visible light.The main contents are as follows:（1）The cubic and octahedral Cu₂O particles were controllably prepared by the wet chemical reduction method.The prepared particles were regular and uniform in size.The average diameters of the two particles were 800and 700 nm,respectively.The cubic and octahedral Cu₂O-RGO nanocomposite systems were prepared by in-situ reduction method with graphene oxide as the carrier.The particle sizes of Cu₂O particles were obviously smaller with average diameters of 300 nm and 250 nm,respectively.The optimum preparation conditions were determined by studying the effect of reaction conditions,such as the dosage of reactants,reaction temperature and reaction time on the prepared nanocomposites.（2）The photocatalytic properties of cubic and octahedral Cu₂O-RGO nanocomposite systems were studied.The degradation of methyl orange under visible light irradiation was conducted.The octahedral Cu₂O-RGO nanocomposite systems turned out to have the best photocatalytic activity with the apparent rate constant at 82.88×10^-3 min^-1.Meanwhile a series of experiments were carried out to study the photocatalytic mechanisms of the nanocomposite systems.The mechanism of the synergetic effect of Cu₂O and graphene was put forward.The innovations of this paper lie on:The optimal preparation methods of cubic and octahedral Cu₂O-RGO nanocomposite systems were obtained by optimizing the experimental parameters.The prepared Cu₂O-RGO nanocomposite systems had excellent visible-light photocatalysis efficiency.Meanwhile,the mechanism of the enhanced photocatalytic activity caused by the synergistic effect between graphene and Cu₂O was proposed systematically for the first time.更多还原