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Nanometer magnesium oxide with dark-room sterilization and sewage degradation performance and method for preparing nanometer magnesium oxide

A technology for nano-magnesia and sewage degradation, which is applied in the field of nano-magnesia and its preparation, sterilization and sewage degradation performance materials, can solve the problems of high product price and complex synthesis process, and achieve low price, simple synthesis process and easy raw materials The effect

Active Publication Date: 2017-01-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above studies have shortcomings such as high product prices or complicated synthesis processes.

Method used

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  • Nanometer magnesium oxide with dark-room sterilization and sewage degradation performance and method for preparing nanometer magnesium oxide
  • Nanometer magnesium oxide with dark-room sterilization and sewage degradation performance and method for preparing nanometer magnesium oxide
  • Nanometer magnesium oxide with dark-room sterilization and sewage degradation performance and method for preparing nanometer magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix magnesium nitrate hexahydrate, diethylamine hydrochloride and urea with a molar ratio of 1.0:0.5:0.2, heat to 150 °C, the mixture melts into a liquid, and continues to heat until it is completely burned to produce a solid powder, which is cooled and ground. After that, a white powder was obtained.

[0030] The obtained white powders were tested by XRD, PL, ESR and dark current, and the spectra are shown in figure 1 a. figure 2 , image 3 a and Figure 4 . The test results show that the purity of the synthesized sample in this example is relatively high, and its particle size is calculated to be about 10 nm according to Scherrer's formula. When the excitation wavelength is 250-290 nm, the synthesized samples in this example have weak visible light emission peaks at 452 nm and 470 nm, respectively, indicating that there may be oxygen vacancies on their surfaces. image 3 The result of a shows that singlet oxygen species can be directly generated on the surface o...

Embodiment 2

[0034] Repeat the operation steps of embodiment 1, the difference is that the mol ratio of magnesium nitrate hexahydrate, diethylamine hydrochloride, urea in the initial mixture is 1.0:1.0:0.5, and the control heating temperature is 200 ° C, and finally obtains a kind of after burning. White powder.

[0035] The above white powder was tested by XRD, ESR, Raman, TEM and TEMHR, and the spectra were shown in figure 1 b. image 3 b. Figure 5 and Image 6 . figure 1 b shows that the synthetic sample of this example is pure magnesium oxide, and the particle size is about 20 nm; image 3 b indicates that singlet oxygen is generated in the synthesized samples in this example, which indirectly indicates the existence of surface oxygen vacancies. Figure 5 The Raman signals (5b) of molecular oxygen on commercial magnesium oxide (5a) and the synthetic samples of this example at different temperatures are shown. Figure 5 b shows that the Raman signal of superoxide anion species ca...

Embodiment 3

[0040] Repeat the operation steps of embodiment 1, the difference is that the mol ratio of magnesium nitrate hexahydrate, diethylamine hydrochloride, urea in the starting mixture is 1.0:1.5:1.0, and the control heating temperature is 250 ° C, and a white color is obtained after burning. powder.

[0041] figure 1 c shows that the synthetic sample in this example is pure magnesium oxide, and the particle size is about 30 nm; image 3 c shows that singlet oxygen is generated in the synthesized sample in this example, which indirectly indicates the existence of surface oxygen vacancies. Figure 10 The results indicated that singlet oxygen, hydroxyl radicals and dissolved oxygen had certain effects on the darkroom degradation behavior of methyl violet azo molecules.

[0042] The test of catalytic degradation of methyl violet and sterilization in the dark room was carried out according to the method of Example 1. The results showed that the degradation rate of methyl violet for th...

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Abstract

The invention discloses nanometer magnesium oxide with dark-room sterilization and sewage degradation performance. Exposed oxygen vacancy sites are arranged on the surfaces of crystal planes {111} of the nanometer magnesium oxide. The particle sizes of particles of the nanometer magnesium oxide used as an antibacterial agent are 10-50 nm. A method for preparing the nanometer magnesium oxide includes (1), mixing magnesium nitrate hexahydrate, diethylamine hydrochloride and urea with one another to obtain mixtures; (2), heating, melting, combusting, cooling and grinding the mixtures obtained at the step (1) to obtain a solid product which is the nanometer magnesium oxide. A molar ratio of the magnesium nitrate hexahydrate to the diethylamine hydrochloride to the urea is 1.0:(0.5-1.5):(0.2-2.0). The nanometer magnesium oxide and the method have the advantages that the nanometer magnesium oxide prepared by the aid of the method is capable of adsorbing active molecular oxygen and directly generating active oxygen species and is good in oxidation sterilization and degradation activity in dark-room environments; raw materials for the nanometer magnesium oxide are easily available, the earth crusts contain abundant magnesium elements, and the magnesium elements are low in cost; the method for synthesizing the nanometer magnesium oxide includes simple processes, is short in time consumption and has an excellent industrial application prospect.

Description

technical field [0001] The invention relates to a sterilizing and degrading sewage performance material with oxidative activity under darkroom conditions, in particular to a nano-magnesium oxide with darkroom sterilizing and sewage degrading performance and a preparation method thereof, belonging to antibacterial, water treatment and nanomaterial synthesis technologies field. Background technique [0002] With the continuous development of society and industry, environmental pollution has also increased, and a large number of harmful bacteria and industrial wastewater have caused serious harm to human health. In order to reduce and reduce the harm of harmful bacteria, people often use antibacterial agents. At present, antibacterial agents used in hospitals, kindergartens and other places are mainly divided into natural antibacterial agents, inorganic antibacterial agents and organic antibacterial agents. Compared with inorganic antibacterial agents, organic antibacterial a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/50A01N59/06A01P1/00B01J21/10C01F5/06B82Y30/00C02F101/30
CPCA01N59/06B01J21/10C01F5/06C01P2002/01C01P2002/72C01P2002/82C01P2002/86C01P2004/04C01P2004/64C02F1/50C02F1/72C02F2101/308
Inventor 郝影娟田立刚孙晓岭李发堂
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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