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Preparation method of praseodymium-doped titanium dioxide composite nanofiber photocatalyst

A technology of composite nanofibers and nanophotocatalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low mercury removal efficiency of photocatalysts and manufacturing processes Difficult to control, high production cost and other problems, to achieve the effect of short cycle, low cost and high productivity

Inactive Publication Date: 2015-05-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, further studies have shown that titanium dioxide can only be excited under ultraviolet light due to its wide band gap (3.2eV), and at the same time has the problem of low activity; in addition, its manufacturing process has defects such as difficult control and high production cost. , and the mercury removal efficiency of the prepared photocatalyst is still low, which has become the unfavorable factor that directly affects its large-scale industrial application

Method used

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  • Preparation method of praseodymium-doped titanium dioxide composite nanofiber photocatalyst
  • Preparation method of praseodymium-doped titanium dioxide composite nanofiber photocatalyst
  • Preparation method of praseodymium-doped titanium dioxide composite nanofiber photocatalyst

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Effect test

Embodiment 1

[0027] Measure acetic acid and ethanol with a graduated cylinder, add 10 g of tetrabutyl titanate to 100 ml of a mixed solution of acetic acid and ethanol (for example, a volume ratio of 1:1), and stir vigorously on a magnetic stirrer to mix evenly. Then, for example, 100ml of ethanol solution of praseodymium acetylacetonate can be prepared by constant volume method, wherein the content of praseodymium acetylacetonate is 3.14g, which is added into the mixed solution of tetrabutyl titanate, acetic acid and ethanol, and then 5g of polyethylene glycol is weighed with a balance. Pyrrolidone is added to it, and it is vigorously stirred on a stirrer until a uniformly mixed, transparent liquid with a certain viscosity is obtained, which is the spinning precursor solution.

[0028] Next, put the spinning precursor solution into a 5ml syringe, connect it to a stainless steel spinneret through a polyethylene tube, and the inner diameter of the spinneret can be selected as 0.5 mm, and fix...

Embodiment 2

[0030] Measure acetic acid and ethanol with graduated cylinders. Add 14.28 g of tetrabutyl titanate into 100 ml of a mixed solution (for example, a volume ratio of 2:5) composed of acetic acid and ethanol, and vigorously stir and mix evenly on a magnetic stirrer. Then, for example, 100ml of ethanol solution of praseodymium acetylacetonate can be prepared by constant volume method, wherein the content of praseodymium acetylacetonate is 26.68g, which is added into the mixed solution of tetrabutyl titanate, acetic acid and ethanol, and then 6g of polyethylene glycol can be weighed with a balance. Pyrrolidone is added to it, and it is vigorously stirred on a stirrer until a uniformly mixed, transparent liquid with a certain viscosity is obtained, which is the spinning precursor solution.

[0031]Next, put the spinning precursor solution into a 5ml syringe, connect it to a stainless steel spinneret through a polyethylene tube, and the inner diameter of the spinneret can be selected...

Embodiment 3

[0033] Measure acetic acid and ethanol with graduated cylinders. Add 16 g of tetrabutyl titanate into a mixed solution of acetic acid and ethanol (for example, a volume ratio of 2:1), and vigorously stir and mix evenly on a magnetic stirrer. Then, for example, 100ml of ethanol solution of praseodymium acetylacetonate can be prepared by constant volume method, wherein the content of praseodymium acetylacetonate is 35g, which is added into the mixed solution of tetrabutyl titanate, acetic acid and ethanol, and then 7g of polyvinylpyrrolidone can be weighed with a balance Add it and stir vigorously on the stirrer until a uniformly mixed, transparent liquid with a certain viscosity is obtained, which is the spinning precursor solution.

[0034] Next, put the spinning precursor solution into a 5ml syringe, connect it to a stainless steel spinneret through a polyethylene tube, and the inner diameter of the spinneret can be selected as 0.6 mm, and fix it on the pinhole plate with a c...

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Abstract

The invention discloses a preparation method of a praseodymium-doped titanium dioxide composite nanofiber photocatalyst. The preparation method comprises the following steps: (a) adding tetrabutyl titanate into a mixed solution of absolute ethyl alcohol and acetic acid, uniformly mixing, then sequentially adding praseodymium acetylacetone and polyvinylpyrrolidone into the mixed solution, further stirring to obtain precursor solution; (b) adding the precursor solution into an injector of an electrostatic spinning device and controlling the process condition of electrostatic spinning to prepare praseodymium-doped titanium dioxide nanoffiber non-woven fabric; (c) putting the nanofiber non-woven fabric into a muffle furnace, increasing the temperature from the room temperature to 500 DEG C under the air atmosphere to calcine, then naturally cooling to the room temperature to obtain the required composite nanofiber photocatalyst product. According to the preparation method of the praseodymium-doped titanium dioxide composite nanofiber photocatalyst, the mercury removal efficiency and performance of coal-fired flue gas can be remarkably improved; meanwhile, the method has the advantages of being convenient to operate, low in cost and low in energy consumption, so that the method is especially applicable to application places for mercury removal of smoke in a coal-fired power plant.

Description

technical field [0001] The invention belongs to the technical field of mercury removal from coal-fired flue gas, and more specifically relates to a preparation method of a praseodymium-doped titanium dioxide composite nanofiber photocatalyst. Background technique [0002] As one of the most toxic heavy metal elements in the environment, mercury pollution has become one of the most concerned global environmental problems due to its persistence, easy migration and high bioaccumulation. In particular, coal combustion is the main source of atmospheric mercury emissions in my country. Whether it is from the perspective of international compliance or domestic mercury pollution control, my country is facing huge pressure to reduce mercury emissions from coal-fired power plants. The "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) promulgated by the Ministry of Environmental Protection of China clearly stipulates that from 2015, the emission of mercury ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/06B82Y30/00B82Y40/00B01D53/86B01D53/64D01D1/02D01D5/00D04H1/728
Inventor 张军营王路路赵永椿田冲杨建平
Owner HUAZHONG UNIV OF SCI & TECH
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