氧化锌—银—聚吡咯与二氧化钛—金—聚苯胺的合成与性能研究
发布时间：2019-02-26 08:01
【摘要】：纳米材料是一种由尺寸介于1至100 nm之间的粒子组成的物质,具有较大的比表面积,以及拥有异于普通材料的特殊性能及较高的催化活性,成为20世纪末21世纪初科研工作者的研究焦点之一。有目的的按照人们的需要将两种或两种以上具有不同性质的纳米粒子复合在一起形成具有特殊性质的复合材料是纳米科学的研究热点。本文以Zn O和Ti O2为研究对象,通过不同的实验方法分别在Zn O和Ti O2上负载在可见光区域活性较强的贵金属和聚合物,通过三者之间的协同作用可以很好的提升Zn O和Ti O2的活性。本文的主要研究内容如下:1.在乙二醇与水的混合溶剂中用预先合成的Ag纳米粒子作种子,聚乙烯吡咯烷酮(PVP)作表面活性剂,通过乙酸锌和六次甲基四胺(HMT)之间的快速反应合成了花生状的Zn O-Ag异质结构。分散在Zn O粒子表面的Ag纳米粒子增加了Zn O在催化降解甲基蓝时的活性,而且经实验证明在Zn O-Ag表面再覆盖一层聚吡咯(PPy)薄膜可以进一步增加其催化活性。原因有两点:一方面,PPy的存在保护了Zn O表面上的Ag粒子在紫外光与可见光照射下不被氧化以及丢失;另一方面,PPy在可见光下可以吸收光子增加样品在催化降解过程中的光吸收率。2.首先在30℃的恒温下,Ti Cl4经过简单的水解反应,不同的时间段内产生不同形貌的Ti O2,且不同形貌的产物产量不同,实验发现处于花状或棒状的Ti O2的产量最多。结合花状产物的合成时间相对较短,我们最终选择花状Ti O2作为研究对象进行复合。将预先合成的Ti O2粉末分散在乙醇中,与同样分散在乙醇中的Au粒子混合,超声生成Ti O2-Au复合粒子。再经过原位聚合的方法在Ti O2-Au粒子表面覆盖一层聚苯胺(PANI)薄膜,成功的合成出了Ti O2-AuPANI三元复合材料。
[Abstract]:A nano-material is a substance consisting of particles between 1 and 100 nm in size, having a large specific surface area, as well as special properties and high catalytic activity different from those of ordinary materials. It has become one of the research focuses of researchers in the end of 20th century and the beginning of 21st century. It is a research hotspot of nano-science to combine two or more kinds of nano-particles with different properties to form composite materials with special properties according to the needs of people. In this paper, Zn O and Ti O 2 were taken as research objects, and precious metals and polymers with strong activity in visible light region were loaded on Zn O and Ti O 2 by different experimental methods, respectively. The activities of Zn O and Ti O 2 can be enhanced by the synergistic action among them. The main contents of this paper are as follows: 1. In the mixed solvent of ethylene glycol and water, pre-synthesized Ag nanoparticles were used as seeds and polyvinylpyrrolidone (PVP) as surfactant. Peanut-like Zn O-Ag heterostructures were synthesized by the rapid reaction between zinc acetate and hexamethylenetetramine (HMT). The Ag nanoparticles dispersed on the surface of Zn O particles increased the activity of Zn O in the catalytic degradation of methyl blue, and it was proved by experiments that another layer of polypyrrole (PPy) film on the surface of Zn O-Ag could further increase its catalytic activity. There are two reasons for this: on the one hand, the existence of PPy protects the Ag particles on the Zn O surface from oxidation and loss under UV and visible light irradiation; On the other hand, PPy can absorb photons in visible light to increase the photoabsorptivity of the sample in the process of catalytic degradation. 2. At the constant temperature of 30 鈩，
本文编号：2430587
[Abstract]:A nano-material is a substance consisting of particles between 1 and 100 nm in size, having a large specific surface area, as well as special properties and high catalytic activity different from those of ordinary materials. It has become one of the research focuses of researchers in the end of 20th century and the beginning of 21st century. It is a research hotspot of nano-science to combine two or more kinds of nano-particles with different properties to form composite materials with special properties according to the needs of people. In this paper, Zn O and Ti O 2 were taken as research objects, and precious metals and polymers with strong activity in visible light region were loaded on Zn O and Ti O 2 by different experimental methods, respectively. The activities of Zn O and Ti O 2 can be enhanced by the synergistic action among them. The main contents of this paper are as follows: 1. In the mixed solvent of ethylene glycol and water, pre-synthesized Ag nanoparticles were used as seeds and polyvinylpyrrolidone (PVP) as surfactant. Peanut-like Zn O-Ag heterostructures were synthesized by the rapid reaction between zinc acetate and hexamethylenetetramine (HMT). The Ag nanoparticles dispersed on the surface of Zn O particles increased the activity of Zn O in the catalytic degradation of methyl blue, and it was proved by experiments that another layer of polypyrrole (PPy) film on the surface of Zn O-Ag could further increase its catalytic activity. There are two reasons for this: on the one hand, the existence of PPy protects the Ag particles on the Zn O surface from oxidation and loss under UV and visible light irradiation; On the other hand, PPy can absorb photons in visible light to increase the photoabsorptivity of the sample in the process of catalytic degradation. 2. At the constant temperature of 30 鈩，
本文编号：2430587
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