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A kind of titanium dioxide nanometer microsphere and its preparation method and application

A nano-microsphere and titanium dioxide technology, applied in the field of nano-materials, can solve the problems of easy compounding, limited practical application, and low solar energy utilization rate, and achieve the effects of good repeatability, improved photocatalytic performance, and strong visible light absorption capacity

Inactive Publication Date: 2018-09-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide has a wide band gap and low utilization rate of solar energy; the photogenerated electrons and holes of titanium dioxide are easy to recombine, and these defects limit the practical application of titanium dioxide as a photocatalyst

Method used

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  • A kind of titanium dioxide nanometer microsphere and its preparation method and application
  • A kind of titanium dioxide nanometer microsphere and its preparation method and application
  • A kind of titanium dioxide nanometer microsphere and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of Titanium Dioxide Nanospheres Exposing [001] Crystal Plane

[0038] Titanium flakes (50mm×15mm, 0.25mm) were ultrasonically degreased through acetone, isopropanol and methanol in turn, rinsed with deionized water, dried under nitrogen, put into an autoclave, and added 60mL of 0.5% Hydrofluoric acid solution was heated at a constant temperature of 180°C for 3h, and the autoclave was naturally cooled to room temperature. The obtained sample was washed with deionized water, dried under nitrogen, placed in a muffle furnace, and calcined at 600°C for 1.5h to obtain TiO 2 (001) Photocatalyst.

[0039] Such as figure 1 As shown, the TiO was observed with a scanning electron microscope (SEM) 2 (001) Morphology of the catalyst. The size of the titanium dioxide microspheres exposed to the [001] crystal plane obtained by the above method is about 2 μm, and the exposed surface is a square [001] crystal plane with a side length of about 0.6 μm.

Embodiment 2

[0041] Preparation of Titanium Dioxide Nanospheres Exposing [001] Crystal Plane

[0042] Firstly, the titanium flakes (50mm×15mm, 0.5mm) were ultrasonically degreased through acetone, isopropanol and methanol, then rinsed with deionized water, dried under nitrogen, put into an autoclave, and added 60mL of 0.3% by volume Hydrofluoric acid solution was heated at a constant temperature of 180°C for 3h, and the autoclave was naturally cooled to room temperature. The obtained sample was washed with deionized water, dried under nitrogen, placed in a muffle furnace, and calcined at 600°C for 1.5h to obtain TiO 2 catalyst of light.

[0043] Such as figure 2 As shown, the TiO was observed with a scanning electron microscope (SEM) 2 Morphology of the catalyst, the prepared TiO 2TiO is a truncated biconical decahedron and cannot form a microsphere structure 2 .

Embodiment 3

[0045] Preparation of Nitrogen and SnO Co-modified TiO Nanospheres with Exposed [001] Facets

[0046] With the TiO obtained in embodiment 1 2 (001) soaked in 1M ammonia water for 16h, and calcined in a muffle furnace at 450°C for 1.5h to obtain N-TiO 2 (001), then the N-TiO 2 (001) into the autoclave, add 5mg / mL SnCl 4 ·5H 2 The mixed solution of O in ethanol was hydrothermally reacted at 150°C for 12h, and SnO was prepared after washing and drying. 2 / N-TiO 2 (001).

[0047] Such as image 3 As shown, the SnO was observed with a scanning electron microscope (SEM) 2 / N-TiO 2 (001) Morphology of the catalyst. The titanium dioxide microspheres co-modified with nitrogen and tin oxide obtained by the above method have a size of about 2 μm, SnO 2 Nanoparticles uniformly dispersed in N-TiO 2 (001) surface.

[0048] Further observation of SnO by transmission electron microscopy 2 / N-TiO 2 (001) Photocatalyst. Depend on Figure 4 It can be seen that the lattice fringes...

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Abstract

The invention discloses a TiO2 nanosphere as well as a preparation method and an application thereof. The nanosphere specifically refers to the TiO2 nanosphere co-modified with N and SnO and provided with an exposed (001) crystal face. The preparation method comprises the following steps: S1, preparing a TiO2 nanosphere provided with the exposed (001) crystal face; S2, preparing a TiO2 nanosphere modified with N and provided with the exposed (001) crystal face; S3, preparing the TiO2 nanosphere co-modified with N and SnO and provided with the exposed (001) crystal face. According to the TiO2 nanosphere co-modified with N and SnO and provided with the exposed (001) crystal face, reaction conditions are mild, the operation is simple, the preparation success rate is high, and the TiO2 nanosphere is easy to recover and reuse; besides, the band gap of TiO2 can be reduced, a heterojunction formed on the surface of the nanosphere can effectively increase the separation rate of photoelectron holes, accordingly, the modified TiO2 nanosphere has high photocatalytic activity under visible light and can be applied to photocatalytic degradation of wastewater pollutants.

Description

technical field [0001] The invention belongs to the technical field of nano-materials, and in particular relates to a titanium dioxide nano-microsphere and a preparation method and application thereof. Background technique [0002] Photocatalytic technology is a wastewater treatment technology developed in recent years. Under the action of light, it undergoes a series of reactions to produce hydroxyl radicals and super oxygen ions with strong oxidizing ability to degrade and decompose organic pollutants. Among the existing semiconductor photocatalysts, titanium dioxide has become one of the most potential photocatalytic materials due to its advantages of low cost, non-toxic, non-polluting, and stable physical and chemical properties. [0003] TiO 2 The physical and chemical properties of crystals are not only related to particle size, surface area and morphology, but also related to their highly active crystal planes, in which the three-dimensional structure exposes the [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCY02W10/37
Inventor 白雪吕玲玲刘雨琪华祖林
Owner HOHAI UNIV
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