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Preparation method and application of bismuth titanate-titanium oxide heterojunction nano-material

A nano-material, titanium oxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the complex ballast water treatment, which cannot meet the requirements of safety, practicality, economy, effectiveness and environmental tolerance and other problems, to achieve the effect of short sterilization time, simple preparation method and good stability

Inactive Publication Date: 2014-01-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no single method for dealing with non-native organisms in ballast water
Existing technologies cannot meet the requirements of safety, practicality, economy, effectiveness and environmental tolerance proposed by the International Maritime Organization
In addition, due to the diversity of organisms in ballast water and the difference in residence time in the tank, the treatment of ballast water is more complicated, and the high flow rate and large flow of ballast water during ballast operation require rapid and efficient sterilization treatment technology

Method used

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  • Preparation method and application of bismuth titanate-titanium oxide heterojunction nano-material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Mix glycerol and ethanol, stir until evenly mixed, add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixed solution, stir vigorously for 20min, transfer the whole mixed solution to the reaction In the kettle; the molar ratio of the bismuth element contained in bismuth nitrate to the titanium element contained in tetrabutyl titanate is 0.1:1; the volume ratio of tetrabutyl titanate, glycerol and ethanol is 1: 4.7: 11.7 . Place the reaction kettle in a constant temperature oven at 120°C to react for 24 hours; after cooling, filter and dry the mixture in the kettle and place it in a temperature-programmed furnace for calcination at 500°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles. The obtained sample can be determined to be Bi by X-ray diffraction pattern 12 TiO 20 with Bi4 Ti 3 o 12 and TiO 2 mixtures such as figure 1 As shown, that is, bismuth titanate-titanium oxide (Bi 1...

Embodiment 2

[0035] Mix glycerol and ethanol, stir until evenly mixed, add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixed solution, stir vigorously for 20min, transfer the whole mixed solution to the reaction In the kettle; the molar ratio of the bismuth element contained in bismuth nitrate to the titanium element contained in tetrabutyl titanate is 0.2:1, and the volume ratio of tetrabutyl titanate, glycerol and ethanol is 1: 4.7: 11.7 . Place the reaction kettle in a constant temperature oven at 120°C for 24 hours; after cooling, filter and dry the mixture in the reaction kettle and place it in a temperature-programmed furnace for calcination at 500°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles , the obtained sample can be determined to be Bi by X-ray diffraction pattern 12 TiO 32 with TiO 2 mixtures such as Figure 4 As shown, that is, bismuth titanate-titanium oxide (Bi 12 TiO 32 / TiO...

Embodiment 3

[0039] Mix glycerol and ethanol, stir until evenly mixed, add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixed solution, stir vigorously for 20min, transfer the whole mixed solution to the reaction In the kettle; the molar ratio of bismuth element contained in bismuth nitrate to titanium element contained in tetrabutyl titanate is 0.3:1, and the volume ratio of tetrabutyl titanate, glycerol and ethanol is 1:4.7: 11.7. Place the reaction kettle in a constant temperature oven at 120°C to react for 24 hours; after cooling, filter and dry the mixture in the kettle and place it in a temperature-programmed furnace for calcination at 500°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles. Such as Figure 6 As shown, the obtained sample can be determined to be Bi by X-ray diffraction pattern 12 TiO 32 、 Bi 2 o 3 and TiO 2 A mixture of bismuth titanate-titanium oxide (Bi 12 TiO 32 -Bi 2 ...

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Abstract

The invention discloses a preparation method of a bismuth titanate-titanium oxide heterojunction nano-material and a method for preparing a membrane electrode by utilizing the bismuth titanate-titanium oxide heterojunction nano-material so as to perform photoelectrocatalytic treatment on bacteria in ballast water. By adopting the process disclosed by the invention to prepare the bismuth titanate-titanium oxide heterojunction nano-material, the synthesis temperature is low and the preparation process is simple; by applying the bismuth titanate-titanium oxide heterojunction nano-material to prepare the membrane electrode, the preparation method is simple, the membrane electrode has relatively good stability, and the electrode can be reused; by utilizing a photoelectrocatalytic technology to apply the membrane electrode in the field of sterilization of the ballast water, equipment is simple, the sterilization time is short, the efficiency is high, the required externally applied voltage is small, and the application is favorable for ballast operation of a ship; furthermore, the sterilization treatment energy consumption is low, the process is simple, the scale is controllable, and the secondary pollution is avoided.

Description

technical field [0001] The present invention relates to a method for preparing a heterojunction and its application, in particular to a method for preparing a bismuth titanate-titanium oxide heterojunction nanomaterial, and the method of making the material into a membrane electrode and applying it to ballast water for sterilization method. Background technique [0002] Ballast water refers to the water filled in the bottom and side tanks of the ship during the shipping process in order to maintain the balance of the hull and ensure the safety of navigation. After a long period of shipping, the ballast water carries a lot of marine microorganisms. At the same time, the ballast water in a closed environment may breed some bacteria. In order to avoid the invasion of alien marine organisms, international conventions stipulate that water containing more bacteria and microorganisms is not allowed to be discharged in different places. Therefore, the treatment of ballast water ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G23/053B82Y30/00C02F1/467C02F1/30C02F1/32
Inventor 王玉萍杨维本任建坤
Owner NANJING NORMAL UNIVERSITY
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