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Preparation method of Bi2O2CO3 photocatalyst, prepared Bi2O2CO3 photocatalyst and application

A photocatalyst, chloride technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc. To achieve the effect of simple and convenient steps, low energy consumption, and large specific surface area

Active Publication Date: 2017-08-04
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current preparation of Bi 2 o 2 CO 3 Surfactants (template agents / structure-directing agents) commonly used in the process may remain in the catalyst, or may decompose during hydrothermal treatment to produce toxic and harmful substances, etc.
Today, as environmental protection is becoming more and more important, it is difficult to synthesize it on a large scale, thus limiting the promotion and application of materials

Method used

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  • Preparation method of Bi2O2CO3 photocatalyst, prepared Bi2O2CO3 photocatalyst and application

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Embodiment B

[0032] Example of the present invention Bi 2 o 2 CO 3The preparation method of photocatalyst, described method comprises the steps:

[0033] (1) adding water to bismuth nitrate and urea, and adding dropwise a chloride solution, stirring to form a bismuth precursor;

[0034] The molar dosage ratio of described bismuth nitrate and urea is: 1: (1-20);

[0035] (2) Adjust the pH value of the bismuth precursor to 5.0-6.5 with an alkaline solution to form a reactant;

[0036] (3) Reacting the reactant at 150-160°C for 24-30h to obtain a precipitate;

[0037] (4) The precipitate obtained in step (3) is washed and dried to obtain a sheet-like structure of Bi 2 o 2 CO 3 Micro-nano sheet photocatalyst powder.

[0038] Described bismuth nitrate raw material generally selects to contain crystal water, for example commercially available Bi(NO 3 ) 3 ·5H 2 O, bismuth nitrate decomposes into basic salt in water. The chloride is easily soluble in water, and it is prepared into a so...

Embodiment 1

[0045] Weigh 0.48507g of Bi(NO 3 ) 3 ·5H 2 O and 0.1g of urea in a beaker; prepare a potassium chloride solution with a concentration of 0.2mol / l and a potassium hydroxide solution of 1mol / l; add 25ml of ultrapure water to the beaker, and add 10ml of the prepared solution dropwise to the cup The above-mentioned 0.2mol / l potassium chloride solution, and after stirring at room temperature for 0.5h, a certain concentration of bismuth precursor is formed; the bismuth precursor in the beaker is transferred to the reaction kettle, and the stirring is continued; the above-mentioned 1mol / l hydrogen Potassium oxide solution adjusts the pH value of the bismuth precursor to 6.0; conducts a hydrothermal reaction at 160°C for 24 hours to obtain a precipitate; washes the precipitate with deionized water and absolute ethanol several times, and then uses a vacuum drying oven Dry at a temperature of 40°C to obtain a sheet-like structure Bi 2 o 2 CO 3 Micro-nano sheet photocatalyst powder....

Embodiment 2

[0047] Weigh 0.48507g of Bi(NO 3 ) 3 ·5H 2 O and 0.3g of urea in a beaker; prepare a potassium chloride solution with a concentration of 0.2mol / l and a potassium hydroxide solution of 1mol / l; add 25ml of ultrapure water to the beaker, and add 10ml of the prepared solution dropwise to the cup 0.2mol / l potassium chloride solution, and after stirring at room temperature for 0.5h, a certain concentration of bismuth precursor is formed; transfer the bismuth precursor in the beaker to the reaction kettle and continue stirring; use 1mol / l potassium hydroxide The pH value of the bismuth precursor was adjusted to 6.0 in the solution; the reaction kettle was subjected to a hydrothermal reaction at 160°C for 24 hours to obtain a precipitate; Drying at a temperature of ℃, the sheet-like structure Bi can be obtained 2 o 2 CO 3 Micro-nano sheet photocatalyst powder.

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Abstract

The invention provides a preparation method of a Bi2O2CO3 photocatalyst, the prepared Bi2O2CO3 photocatalyst and application. The preparation method comprises the following steps: (1) adding water into bismuth nitrate and urea, dropwise adding chloride solution, and stirring to form a bismuth precursor, wherein the molar dosage ratio of bismuth nitrate to urea is 1:(1-20); (2) regulating pH value of the bismuth precursor to be 5.0-6.5 by adopting alkaline solution, and forming a reactant; (3) carrying out reaction on the reactant for 24-30 hours at the temperature of 150-160 DEG C, so that precipitate is obtained; and (4) washing the precipitate obtained in the step (3), and drying, so that Bi2O2CO3 micro-nanosheet photocatalyst powder of a flake-like structure is obtained. The preparation method provided by the invention has the advantages that reagents used in the process are respectively a nontoxic and harmless green reagent without secondary pollution, and no pollution can be produced to the environment in a using process of the photocatalyst. The prepared Bi2O2CO3 photocatalyst has good photocatalytic activity, has high catalytic efficiency when being applied to wastewater degradation, also has good stability and is recyclable.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical photocatalytic water treatment, in particular to a Bi 2 o 2 CO 3 Preparation method of photocatalyst and prepared Bi 2 o 2 CO 3 Photocatalysts and applications. Background technique [0002] Photocatalytic technology has important application prospects in solving energy and environmental problems, so it has received extensive attention. In the field of photocatalysis, TiO 2 Due to its excellent properties such as high photocatalytic activity, stable structure, low price, and non-toxicity, it is known as one of the most widely studied photocatalysts. But TiO 2 The electrons and holes generated during photoexcitation are very easy to recombine, making the photon quantum efficiency low. Therefore, the development of new semiconductor photocatalysts has become one of the main research tasks. [0003] At present, Bi-based composite photocatalytic semiconductors have good photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J27/232C02F1/30C02F1/32C02F101/30
CPCC01G29/00C02F1/30C02F1/32B01J27/232C01P2004/03C01P2002/72C01P2002/84C02F2305/10C02F2101/308C01P2004/61B01J35/39
Inventor 徐海明夏东升李东亚袁向娟曹刚孙磊巩嘉杨孙静宇蔡雨杰
Owner WUHAN TEXTILE UNIV
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