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The Study On The Preparation And Photo-catalytic Capability Of Nano Zinc Oxide

Posted on:2009-07-23Degree:MasterType:Thesis
Country:ChinaCandidate:W B ZhuFull Text:PDF
GTID:2121360245473884Subject:Analytical Chemistry
Abstract/Summary:PDF Full Text Request
Nanotechnology is the world's cutting-edge technology, nano-materials science is set condensed matter physics, colloidal chemistry, coordination chemistry, chemical reaction dynamics, chemical and other surfaces and interfaces for the integration of cross-disciplinary science. Because of the special structure which makes nano-materials with many special nature that common materials do not have have a wide application. Nano-Zinc Oxide as a functional materials compared with ordinary zinc oxide, nano-materials because of the unique surface effect, small size effect, the quantum effect and the macro quantum tunnel effect, making nano-Zinc Oxide in the light, electricity, magnetic, chemical, Biology has a new series of special performance.At present, research on nano-zinc oxide has conducted many, and in many ways has also made great progress. We have successfully developed a lot of the preparation method of nano-Zinc Oxide, nano-zinc oxide on the applications for its photocatalytic fields, gas sensing, and the paint industry as a luminous materials, and so on and achieved great success. In this experiment on the basis of these studies for the preparation of nano-Zinc Oxide and photocatalytic properties of an in-depth study, the main research and results are as follows:1. The preparation of nano ZnOWe have done research on nano-Zinc Oxide by two different methods of preparation. At present the simple application of a wide range of direct precipitation has improved, the introduction of the ultrasound method, and selected the right surfactant, a uniform distribution of particle sizes of about 15 nm zinc oxide particles. Through these improvements has greatly improved by a direct precipitation of the particle size distribution of a wide scope of the phenomenon and reunion, and other more serious shortcomings.Apart from direct precipitation, this study also thermal decomposition of water prepared by special morphology of nano-zinc oxide to a certain amount of research. Through the study found that zinc powder in alkaline water environment in the thermal decomposition of zinc oxide produced in the experiment by adding zinc nitrate, manganese, such as nitric acid solution can greatly improve the shape and size of the product, this way of a flower-shaped clusters Zinc oxide nano-rods. At the same time, found that the alkalinity of the morphology of the impact of significant size, the higher alkalinity, the product of a system of zinc oxide nanorods morphology of the smaller size of the rules. The experimental method is simple, easy system in good shape the product of zinc oxide nanorods.2. The surface modification of nano ZnOThe application of nano-zinc oxide in many areas are mixed in their organic matter, and zinc oxide as a non - of direct-to add to organic matter, there are considerable difficulties, it is necessary to modify their research. This experiment in the use of direct precipitation method in nano-zinc oxide particles on the basis of a modified its research, choose oleic acid as a modifier, through the modification of zinc oxide before and after the oil-degree effect of the modification, Through a variety of ways that this modification is in fact the surface of the nano-zinc oxide and hydroxy acid etherification through to the oleic acid grafted nano-zinc oxide particles formed a single-molecule level, this has greatly enhanced the nano-zinc oxide The pro-oil to enable it to better spread in organic solvents, while effective in blocking the reunion phenomenon in nano-zinc oxide.3. The study on the catalytic capability of nano ZnOZnO is a kind of superior performance in many of the new wide band gap II-VI family compound semiconductor materials and semiconductor materials currently used as catalyst, photocatalytic oxidation of organic pollutants has been a hot research. The text of the first experimental study of methods of nano-zinc oxide on the basis of recent years, nano-zinc oxide catalyst in the field of optical applications, the use of nano-zinc oxide product of methylene blue, magenta, and other organic fuel photocatalytic Experiments on the photocatalytic properties of nano-zinc oxide and the impact of its photocatalytic properties of several factors undertake a comprehensive study. The results of the surface of nano-zinc oxide for many organic compounds have good photocatalytic degradation, and that the best conditions.
Keywords/Search Tags:nano Zinc Oxide, direct precipitation method, water-heated method, surface modification, photo-catalyst
PDF Full Text Request
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