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A kind of bi with micro-nano structure 4 ti 3 o 12 Photocatalyst and its preparation method and use

A photocatalyst, micro-nano structure technology, applied in the direction of light water/sewage treatment, etc., can solve the problems of complex solvothermal synthesis technology, difficult to prepare with controllable particle size, and inability to large-scale production, etc., to improve reusability, improve Specific surface area and adsorption characteristics, the effect of achieving controllability

Active Publication Date: 2017-06-16
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvothermal synthesis technology is complex, high cost, and cannot be produced on a large scale, and it is difficult to prepare Bi with controllable particle size and uniform distribution by a simple solid-state roasting method. 4 Ti 3 o 12 powder

Method used

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  • A kind of bi with micro-nano structure <sub>4</sub> ti <sub>3</sub> o <sub>12</sub> Photocatalyst and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Bi with micro-nano structure 4 Ti 3 o 12 The preparation of photocatalyst, specific steps are as follows:

[0018] ①. Preparation of sol: Dissolve 0.05mol of bismuth nitrate in 250ml of nitrate ethanol solution with a concentration of 1mol / L, ultrasonically react for 20min at 20°C, add 0.0375mol of tetrabutyl titanate to the solution, and stir the solution 10~12h.

[0019] ②, spray drying process, take the sol in step ①, after setting the parameters of the spray granulator, wait until the heating temperature reaches the required temperature range, and then spray granulate.

[0020] ③. The calcination process. The powder in step ② is taken for calcination. The heating rate is 1°C / min, the heating temperature is 500°C, and the holding time is 30min.

[0021] Hollow Bi prepared by this process 4 Ti 3 o 12 Microsphere photocatalyst, the diameter of the microsphere is 0.5 ~ 2μm, the surface of the microsphere is uniformly distributed with mesopores with a diameter of ...

Embodiment 2

[0023] The preparation method of this example is the same as Example 1, except that the heating temperature in step ③ is changed to 400°C.

[0024] Hollow Bi prepared by this process 4 Ti 3 o 12 Microsphere photocatalyst, the diameter of the microsphere is 0.5 ~ 2μm, the surface of the microsphere is uniformly distributed with mesopores with a diameter of about 25nm, and the specific surface area is about 2.86m 2 / g, and the degradation rate of methyl orange is more than 90% under ultraviolet light irradiation for 2h.

Embodiment 3

[0026] The preparation method of this example is the same as that of Example 1, except that the heating temperature in step ③ is changed to 600°C.

[0027] Hollow Bi prepared by this process 4 Ti 3 o 12 Microsphere photocatalyst, the diameter of the microsphere is 0.5 ~ 2μm, the surface of the microsphere is uniformly distributed with mesopores with a diameter of about 25nm, and the specific surface area is about 2.86m 2 / g, and the degradation rate of methyl orange is more than 90% under ultraviolet light irradiation for 2h.

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Abstract

The invention relates to the technical fields of nano materials and photocatalytic degradation of organic pollutants, particularly a micro / nano-structure Bi4Ti3O12 photocatalyst, and a preparation method and application thereof. The Bi4Ti3O12 microspheres have regular shape, and the diameter is 0.5-2 mu m; the microspheres have hollow inside; mesopores with the pore size of 25nm or so are uniformly distributed on the microsphere surface. The micron-sized Bi4Ti3O12 photocatalyst has favorable recoverability. The hollow structure and surface nano mesopores greatly increase the specific area of the microspheres, thereby obviously enhancing the adsorptivity and photocatalytic performance of the Bi4Ti3O12 microspheres; and the Bi4Ti3O12 photocatalyst can be effectively used for photocatalytic degradation of organic matters in the water body. The hollow structure and surface mesopores are formed by volatilization of organic matters in the calcination process, and the porosity and specific area can be adjusted by controlling the addition amount of the pore forming agent, thereby implementing controllability on the performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and photocatalytic degradation of organic pollutants, in particular to a Bi 4 Ti 3 o 12 Photocatalyst and its preparation method and use. Background technique [0002] With the advancement of science and technology and the development of industrial technology, the problem of environmental pollution has become the most serious problem in the world. Under such a large background, the problem of environmental pollution control has become one of the main concerns of human beings. The use of photocatalytic technology to degrade and eliminate organic pollution such as wastewater in industrial production has become one of the effective ways to control environmental pollution. Nano-TiO 2 It has been extensively studied as a photocatalyst. Bi 4 Ti 3 o 12 It is one of the bismuth titanate compounds. Its crystal structure is orthorhombic. It is a very typical Bi-based layered compound with a p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C02F1/32
Inventor 徐光青张旭吕珺吴玉程郑治祥
Owner HEFEI UNIV OF TECH