Preparation method for significantly enhancing surface photo-voltage signal of BiOCl

A surface photovoltage and signal technology, applied in the fields of material chemistry and photocatalytic materials, can solve the problems of poor controllability and complicated operation, and achieve the effects of simple operation, easy availability of raw materials and easy realization.

Active Publication Date: 2017-10-20
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all have the disadvantages of cumbersome operation and poor controllability. It is urgent to use simple means to improve the photogenerated charge separation effect of BiOCl, so as to further improve the photocatalytic performance and lay a solid foundation for the realization of industrial applications.

Method used

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  • Preparation method for significantly enhancing surface photo-voltage signal of BiOCl
  • Preparation method for significantly enhancing surface photo-voltage signal of BiOCl
  • Preparation method for significantly enhancing surface photo-voltage signal of BiOCl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the first step, bismuth nitrate is dissolved in glacial acetic acid. Specifically, 5 g of bismuth nitrate was dissolved in 40 mL of glacial acetic acid, and 20,000 dextran was added. The molar number of dextran was 1% of that of bismuth nitrate.

[0033] In the second step, 10 mL of KCl solution was added dropwise to the bismuth nitrate-glacial acetic acid solution, and the number of moles of KCl was equal to the number of moles of bismuth nitrate. The resulting precipitate was transferred to a hydrothermal reaction kettle, hydrothermally treated at 180°C for 24 hours, and cooled naturally to room temperature.

[0034] In the third step, wash with deionized water and then wash with alcohol for 1-2 times, take out the powder and disperse it in alcohol, dry at 80°C to obtain a sample, and test the surface photovoltage.

Embodiment 2

[0038] In the first step, bismuth nitrate is dissolved in glacial acetic acid. Specifically, 5 g of bismuth nitrate was dissolved in 50 mL of glacial acetic acid, and dextran 20,000 was added. The molar number of dextran was 3% of that of bismuth nitrate.

[0039] In the second step, 10 mL of KCl solution was added dropwise to the bismuth nitrate-glacial acetic acid solution, and the number of moles of KCl was equal to the number of moles of bismuth nitrate. The resulting precipitate was transferred to a hydrothermal reactor, hydrothermally treated at 160°C for 24 hours, and cooled naturally to room temperature.

[0040] In the third step, wash with deionized water and then wash with alcohol for 1-2 times, take out the powder and disperse it in alcohol, dry at 60°C to obtain a sample, and test the surface photovoltage.

[0041] Compared with Comparative Example 1, in Example 2, 20,000 dextran was added, the molar number of dextran was 3% of that of bismuth nitrate, the hydrot...

Embodiment 3

[0044] In the first step, bismuth nitrate is dissolved in glacial acetic acid. Specifically, 5 g of bismuth nitrate was dissolved in 60 mL of glacial acetic acid, and 20,000 dextran was added. The molar number of dextran was 4% of that of bismuth nitrate.

[0045] In the second step, 10 mL of KCl solution was added dropwise to the bismuth nitrate-glacial acetic acid solution, and the number of moles of KCl was equal to the number of moles of bismuth nitrate. The resulting precipitate was transferred to a hydrothermal reactor, hydrothermally treated at 170°C for 24 hours, and naturally cooled to room temperature.

[0046] In the third step, wash with deionized water and then wash with alcohol for 1-2 times, take out the powder and disperse it in alcohol, dry at 70°C to obtain a sample, and test the surface photovoltage.

[0047] Compared with Comparative Example 1, in Example 3, 20,000 dextran was added, the molar number of dextran was 4% of that of bismuth nitrate, the hydrot...

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Abstract

The invention relates to the field of material chemistry and especially relates to the field of photocatalytic materials, and particularly provides a preparation method for significantly enhancing surface photo-voltage signal of BiOCl. The method includes the steps of: 1) dissolving bismuth nitrate in glacial acetic acid and adding glucan 20000; 2) dropwise adding 10 ml of a KCl solution to the bismuth nitrate-glacial acetic acid-glucan solution to obtain a precipitate, wherein the mole number of KCl is equal to that of the bismuth nitrate; 3) hydrothermally treating the precipitate in a hydrothermal reaction kettle and naturally cooling a product to room temperature; and 4) washing the produced powder with deionized water and ethanol, dispersing the powder in ethanol, and drying the mixture to obtain a sample. With assistance of the glucan 20000, the surface photo-voltage signal of the BiOCl sample is significantly enhanced in the range of 300-500. The method has simple operations, employs easy-to-obtained raw materials, is easy to carry out and is safe and reliable.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to the field of photocatalytic materials, in particular to a preparation method for significantly enhancing the photovoltage signal on the surface of BiOCl. Background technique [0002] The crystal structure of BiOCl is PbFCl type, symmetry: D 4h , space group: P4 / nmm, belonging to the tetragonal crystal system. BiOCl has a layered structure, and the BiOCl atomic layers arranged in double layers are combined by Cl atoms through non-bonding forces (van der Waals forces). The valence band of BiOCl is mainly occupied by O 2p and Cl 3p, and the conduction band is mainly contributed by Bi 6p orbitals. Since BiOCl is an indirect transition band gap, the excited electrons must pass through some K layers to reach the valence band, which reduces the probability of recombination of excited electrons and holes. The coexistence of open crystal structure and indirect transition mode of Bi...

Claims

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Application Information

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IPC IPC(8): B01J27/06
CPCB01J27/06B01J37/10B01J35/39
Inventor 钟俊波宋新建李建章陈久福
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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