CuO复合材料的制备及其拟芬顿性能的研究

发布时间：2018-04-02 03:33

本文选题：CuxO@C复合材料　切入点：rGO-CuO复合材料　出处：《武汉理工大学》2015年硕士论文

【摘要】：随着纺织工业的快速发展,染料的品种和成分也不断翻新。然而,对于因纺织染料引起的水质污染,高效的催化方法一直备受期待。其中有H2O2参与的拟芬顿催化体系具有很强的催化优势,如材料合成简单、降解速率快、操作过程绿色环保、实验成本低、实验仪器要求简单等。研究表明,一些金属氧化物及相应卤氧化物(Fe3O4,CeO2,BiOBr,FeOCl等),金属硫系化合物(如Cu9S5,CuS,CuS/CuSe,FeS等)以及金属磷酸盐(如Fe5(PO4)4(OH)3·2H2O)具有优良的拟芬顿催化性能并可用于降解有机污染物。Cu O作为一种多功能半导体材料,在气体传感器、光催化和锂离子电池等领域具有重要应用。近几年,由于其具有拟芬顿性能而备受关注。CuO及CuO基复合材料对过氧化氢(H2O2)具有亲和性并具备较强的拟过氧物酶活性,可以替代过氧化物酶应用于葡萄糖生物传感器的检测。纳米CuO可以在H2O2协同作用下快速催化氧化TMB(3,3',5,5'-四甲基联苯胺)和OPD(邻苯二胺)等有机物。鉴于CuO可以将H2O2分解成具有强氧化能力的·OH等活性物种,因此其在染料降解领域具有较强的应用潜力。(1)CuxO@C复合材料制备及其拟芬顿催化性能研究以Cu-MOF为前驱体,通过在N2气氛和空气中依次煅烧,得到CuxO@C复合材料,该材料保留了Cu-MOF的立方结构。产物中含有大量CuxO(x=1,2)纳米颗粒,该纳米颗粒被碳层材料包覆并均匀分布在纤维状的石墨化碳层表面。CuxO@C复合材料在加入少量H2O2后具有优良的拟芬顿催化性能且具有稳定性,这与产物为多孔结构且在煅烧过程中生成石墨化碳层结构有关。(2)rGO-CuO复合材料制备及其拟芬顿催化性能研究通过Cu(NO3)2和Na2CO3在水溶液中反应得到Cu2(OH)2CO3胶体,与氧化石墨烯混合后,再采用水热法得到rGO-CuO拟芬顿催化材料。当rGO的质量百分比达到0.1 wt%时,rGO-CuO拟芬顿催化材料对RhB溶液的降解性能为最佳且具有稳定性。rGO能增强CuO拟芬顿催化性能的原因:一是rGO对CuO的微观结构可以进行调控;二是rGO可以有效转移电子从而加速拟芬顿反应速率;三是rGO通过Π-Π作用促进催化剂对Rh B染料的吸附作用。(3)Ag-CuO复合材料制备及其光芬顿催化性能研究将商业Cu粉在空气中煅烧得到CuO,再在CuO表面上采用光沉积Ag的方法成功合成Ag-CuO复合材料。当Ag的理论值含量达到10%时,Ag-CuO光芬顿材料对RhB溶液的光芬顿降解性能最佳且具有稳定性。Ag能增强CuO光芬顿催化性能的原因是Ag能够快速转移光生电子,提高催化效率。
[Abstract]:With the rapid development of textile industry, the variety and composition of dyes are constantly renovated.However, efficient catalytic methods have been expected for the water pollution caused by textile dyes.The pseudo-Fenton catalytic system with the participation of H2O2 has strong catalytic advantages, such as simple material synthesis, fast degradation rate, green operation process, low experimental cost, simple equipment requirements, and so on.Research shows thatSome metal oxides and their corresponding halogen oxides, such as Fe3O4CeO2O2BiOBr-FeOCl, metal sulfur compounds (such as Cu9S5CUSS / CuSeFES, etc.) and metal phosphates (such as Fe5(PO4)4(OH)3 _ 2H _ 2O) have excellent quasi-Fenton catalytic properties and can be used to degrade organic pollutant. CuO as a multifunctional semiconductor material,It has important applications in gas sensor, photocatalysis and lithium ion battery.In recent years, due to its quasi-Fenton properties, CuO and CuO matrix composites have affinity to H _ 2O _ 2 hydrogen peroxide and have strong peroxidism enzyme activity, so they can be used to detect glucose biosensor instead of peroxidase.Nanometer CuO can rapidly catalyze the oxidation of CuO and o-phenylenediamine (OPD) under the synergistic action of H2O2.In view of the fact that CuO can decompose H2O2 into active species such as OH with strong oxidation ability, it has a strong application potential in the field of dye degradation. The preparation and quasi-Fenton catalytic performance of Cu-MOF are studied.CuxO@C composites were obtained by calcination in N2 atmosphere and air respectively. The cubic structure of Cu-MOF was retained.The product contains a large number of CuxOXOX1 / 2) nanoparticles, which are coated with carbon layer material and distributed uniformly on the surface of fibre-like graphitized carbon layer. The CuxOOR-C composite has excellent pseudo-Fenton catalytic performance and stability after adding a small amount of H2O2 to the surface of the graphitized carbon layer.This is related to the structure of graphitized carbon layer formed in the calcination process and the preparation and pseudo-Fenton catalytic properties of the composite. The Cu2(OH)2CO3 colloid was prepared by the reaction of Cu(NO3)2 and Na2CO3 in aqueous solution and mixed with graphene oxide.The rGO-CuO quasi-Fenton catalytic material was obtained by hydrothermal method.When the mass percentage of rGO is 0.1 wt%, the degradation performance of RhB solution is the best with the stability. RGO can enhance the catalytic performance of CuO pseudo-Fenton. One is that rGO can regulate the microstructure of CuO.Second, rGO can transfer electrons effectively and accelerate the pseudo-Fenton reaction rate.Thirdly, rGO can promote the adsorption of RHB dyes on RHB by rGO. Preparation of Ag-CuO Composites and its photocatalytic Properties; calcination of commercial Cu powder in air to obtain CuO; then photodeposition of Ag on the surface of CuOAg-CuO composites were successfully synthesized.When the theoretical value of Ag is 10, the Ag-CuO photo-Fenton material has the best photo-Fenton degradation performance for RhB solution and the stability. Ag can enhance the photo-Fenton catalytic performance of CuO. The reason is that Ag can quickly transfer photogenerated electrons and improve the catalytic efficiency.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;O643.36

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