CN1384057A - Low-temperature thermal decomposition process of preparing nano zinc oxide - Google Patents
Low-temperature thermal decomposition process of preparing nano zinc oxide Download PDFInfo
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- CN1384057A CN1384057A CN 02135115 CN02135115A CN1384057A CN 1384057 A CN1384057 A CN 1384057A CN 02135115 CN02135115 CN 02135115 CN 02135115 A CN02135115 A CN 02135115A CN 1384057 A CN1384057 A CN 1384057A
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Abstract
The present invention relates to the technology of preparing nano zinc oxide. Alkali zinc carbonate and dispersant sodium dodecyl benzene sulfonate in a weight ratio of 1 to 1-5 are mixed, and the mixture is calcinated at 200-500 deg.c in a furnace for 1.5-3.5 hr, and crushed to obtain nano ZnO product. The said process has short course, low cost, low power consumption and high product quality, and the product is white and has grain size 10-40 nm.
Description
(I) technical field
The invention relates to preparation of nano zinc oxide, in particular to a method for preparing nano zinc oxide by a low-temperature thermal decomposition method.
(II) background of the invention
The nano ZnO has small particle size and large specific surface area, has surface effect, quantum size effect, long-lasting effect and the like, and shows a plurality of special properties such as non-toxicity and non-migration, fluorescence, piezoelectricity absorption and ultraviolet scattering capability compared with common ZnO. This new state of matter gives ZnO a conventional product many new uses in the scientific and technological fields, such as the manufacture of gas sensors, phosphors, UV-shielding materials, varistors, image recording materials, piezoelectric materials, piezoresistors, magnetic materials, high-efficiency catalysts, etc. The resistance change of ZnO can be used to make alarm, moisture absorption ion, conduction thermometer; the ultraviolet screening ability of the nano ZnO is utilized to prepare an ultraviolet filter and a cosmetic sunscreen cream; ZnO is taken as a main body and is matched with Bi2O3、Pb6O11Powder materials such as BaO and the like are sintered and molded to obtain the rheostat; by utilizing the photosensitive theory of ZnO semiconductor, nano ZnO can be used as an efficient photocatalyst for degrading wasteOrganic pollutants in water purify the environment. At present, the development and application of nano ZnO are highly concerned by people. A plurality of methods for preparing the nano ZnO exist, but the problems of complex reaction process, high cost and the like generally exist.
Disclosure of the invention
Aiming at the defects of the prior art, the invention provides a method for preparing nano zinc oxide by using a low-temperature thermal decomposition method.
The content of the invention comprises: selecting basic zinc carbonate as raw material, adding dispersing agent, calcining at low temp. to make basic zinc carbonate be decomposed into nano-grade ZnO and CO2And water vapor. The reaction formula is as follows:
the schematic flow is as follows:
the method of the invention comprises the following steps:
mixing the basic zinc carbonate and a dispersant sodium dodecyl benzene sulfonate according to a weight ratio of 1: 1-5, directly feeding into a furnace, calcining at 200-500 ℃ for 1.5-3.5 hours, and crushing to obtain a nano ZnO product.
The content of basic zinc carbonate raw material is more than or equal to 57 percent calculated by dry Zn, the water content is less than or equal to 3.5 percent, and the particle size is less than 74 mu m.
The nano ZnO product prepared by the method is white, has the average grain diameter of 10-40 nm, good product quality, good dispersibility in water and pores of 1.6 ml/g.
Compared with the prior art, the method has the following excellent effects:
(1) the process is short, and the procedures of synthesis, separation, drying and the like in the common liquid phase production method are omitted;
(2) the investment is saved, and the equipment investment in the liquid phase production method is reduced;
(3) the energy consumption is low because the working procedure is short and the energy consumption is low because the calcination is carried out at low temperature;
(4) the product has good quality, which is embodied in that firstly, the amount of the introduced impurities is less than or equal to 0.01 percent; secondly, the particle size meets the requirement that the average particle size is 10-40 nm, the specific surface area is larger than or equal to 74%, and the product quality reaches the quality of similar products in Belgium, Germany Bayer and Japan JISK 1410.
(IV) detailed description of the preferred embodiments
Example 1.
The basic zinc carbonate contains 57.0 percent of Zn, 3 percent of water content and 70 mu m of particle size. (all are in weight percent, the same below)
Mixing the basic zinc carbonate and dispersant sodium dodecyl benzene sulfonate according to the weight ratio of 1: 5, directly feeding into a furnace, calcining for 2.5 hours at the temperature of 400 ℃, and crushing to obtain a nano ZnO product with the average particle size of 35 nm.
Example 2.
The basic zinc carbonate contains 57.2 percent of Zn, 2 percent of water content and 60 mu m of particle size.
Mixing the basic zinc carbonate and a dispersant sodium dodecyl benzene sulfonate according to a weight ratio of 1: 4, directly putting into a furnace, calcining for 3 hours at the temperature of 300 ℃, and crushing to obtain a nano ZnO product with the average particle size of 30 nm.
Example 3.
The basic zinc carbonate contains 57.3% of Zn, 2.5% of water and 50 μm of particle size.
Mixing the basic zinc carbonate and dispersant sodium dodecyl benzene sulfonate according to the weight ratio of 1: 1, directly feeding into a furnace, calcining for 2 hours at the temperature of 450 ℃, and crushing to obtain a nano ZnO product with the average particle size of 40 nm.
Example 4.
The basic zinc carbonate contains 57.4% of Zn, 1.5% of water and 55 μm of particle size.
Mixing the basic zinc carbonate and dispersant sodium dodecyl benzene sulfonate according to the weight ratio of 1: 3, directly feeding into a furnace, calcining for 3.5 hours at the temperature of 250 ℃, and crushing to obtain a nano ZnO product with the average particle size of 25 nm.
Claims (2)
1. A method for preparing nano zinc oxide by a low-temperature thermal decomposition method is characterized in that basic zinc carbonate and a dispersant sodium dodecyl benzene sulfonate are mixed according to the weight ratio of 1: 1-5, directly put into a furnace, calcined at the temperature of 200-500 ℃ for 1.5-3.5 hours, and crushed to obtain a nano ZnO product.
2. The method for preparing nano zinc oxide by low-temperature thermal decomposition according to claim 1, wherein the content of basic zinc carbonate raw material calculated by dry Zn is more than or equal to 57%, the water content is less than or equal to 3.5%, and the particle size is less than 74 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021351155A CN1161279C (en) | 2002-06-13 | 2002-06-13 | Low-temperature thermal decomposition process of preparing nano zinc oxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021351155A CN1161279C (en) | 2002-06-13 | 2002-06-13 | Low-temperature thermal decomposition process of preparing nano zinc oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1384057A true CN1384057A (en) | 2002-12-11 |
| CN1161279C CN1161279C (en) | 2004-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021351155A Expired - Fee Related CN1161279C (en) | 2002-06-13 | 2002-06-13 | Low-temperature thermal decomposition process of preparing nano zinc oxide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333117C (en) * | 2004-11-02 | 2007-08-22 | 清华大学 | Method for developping directionally aligning zinc oxide nanometer rod array on silicon substrate |
| US8142743B2 (en) | 2009-06-25 | 2012-03-27 | Industrial Technology Research Institute | Method and apparatus for forming zinc oxide |
| CN106390980A (en) * | 2016-11-03 | 2017-02-15 | 南京福特卡特材料科技有限公司 | ZnO defect nano-crystal visible light photocatalyst and preparation method thereof |
-
2002
- 2002-06-13 CN CNB021351155A patent/CN1161279C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333117C (en) * | 2004-11-02 | 2007-08-22 | 清华大学 | Method for developping directionally aligning zinc oxide nanometer rod array on silicon substrate |
| US8142743B2 (en) | 2009-06-25 | 2012-03-27 | Industrial Technology Research Institute | Method and apparatus for forming zinc oxide |
| CN106390980A (en) * | 2016-11-03 | 2017-02-15 | 南京福特卡特材料科技有限公司 | ZnO defect nano-crystal visible light photocatalyst and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1161279C (en) | 2004-08-11 |
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