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Preparation method of barium titanate/silver iodate heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in the field of photocatalysis, can solve the problems of low separation rate of photogenerated carriers, low spectral response range, poor photocatalytic performance, etc., and achieve high reducing ability and oxidizing ability, efficient photodegradation Organic pollutants, short time effect

Pending Publication Date: 2021-10-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BaTiO 3 It has a wide band gap (~3.18eV), a low spectral response range, and a low separation rate of photogenerated carriers, which leads to poor photocatalytic performance, which limits its application field.

Method used

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  • Preparation method of barium titanate/silver iodate heterojunction photocatalyst
  • Preparation method of barium titanate/silver iodate heterojunction photocatalyst
  • Preparation method of barium titanate/silver iodate heterojunction photocatalyst

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preparation example Construction

[0032] a BaTiO 3 / AgIO 3 A method for preparing a heterogeneous photocatalyst, comprising the following steps:

[0033] Step 1: Preparation of BaTiO 3 : Add 18.3ml of N,N-dimethylacetamide (DMAC) to 58.4mL of isopropanol (IPA) and stir well, then add 2.5ml of tetrabutyl titanate (TBOT) into the above mixture and stir well , and then transfer the obtained suspension to a 100ml hydrothermal kettle, place the hydrothermal kettle in an oven at 200°C for 20 hours, separate the suspension after the reaction, wash with absolute ethanol, and finally place it in an oven at 60°C Dried to H 2 Ti 2 o 5 Precursor;

[0034] Pour 7ml of water into 28ml of absolute ethanol, and stir for 10min with magnetic force. Add 0.2g of H 2 Ti 2 o 5 Precursor, 0.3g of NaOH and 0.32g of Ba(OH) 2 ·8H 2 O was added to the above solution in turn and stirred evenly, and then placed in a hydrothermal kettle to react at 140°C for 8 hours. After the reaction was completed, the precipitate was washed ...

Embodiment 1

[0056] Preparation of x-AgIO by Solvothermal, Hydrothermal and Room Temperature Precipitation 3 / BaTiO 3 , where x=0.3, x is AgNO 3 with BaTiO 3 The mol ratio, concrete steps are as follows:

[0057] Step 1: Preparation of BaTiO 3 : Add 18.3ml of N,N-dimethylacetamide (DMAC) to 58.4mL of isopropanol (IPA) and stir well, then add 2.5ml of tetrabutyl titanate (TBOT) into the above mixture and stir well , and then transfer the obtained suspension to a 100ml hydrothermal kettle, place the hydrothermal kettle in an oven at 200°C for 20 hours, separate the suspension after the reaction, wash with absolute ethanol, and finally place it in an oven at 60°C Dried to H 2 Ti 2 o 5 Precursor;

[0058] Pour 7ml of water into 28ml of absolute ethanol, and stir for 10min with magnetic force. Add 0.2g of H 2 Ti 2 o 5 Precursor, 0.3g of NaOH and 0.32g of Ba(OH) 2 ·8H 2 O was added to the above solution in turn and stirred evenly, and then placed in a hydrothermal kettle to react a...

Embodiment 2

[0061] Preparation of x-AgIO by Solvothermal, Hydrothermal and Room Temperature Precipitation 3 / BaTiO 3 , where x=1, x is AgNO 3 with BaTiO 3 The mol ratio, concrete steps are as follows:

[0062] Step 1: Preparation of BaTiO 3 : Add 18.3ml of N,N-dimethylacetamide (DMAC) to 58.4mL of isopropanol (IPA) and stir well, then add 2.5ml of tetrabutyl titanate (TBOT) into the above mixture and stir well , and then transfer the obtained suspension to a 100ml hydrothermal kettle, place the hydrothermal kettle in an oven at 200°C for 20 hours, separate the suspension after the reaction, wash with absolute ethanol, and finally place it in an oven at 60°C Dried to H 2 Ti 2 o 5 Precursor;

[0063] Pour 7ml of water into 28ml of absolute ethanol, and stir for 10min with magnetic force. Add 0.2g of H 2 Ti 2 o 5 Precursor, 0.3g of NaOH and 0.32g of Ba(OH) 2 ·8H 2 O was added to the above solution in turn and stirred evenly, and then placed in a hydrothermal kettle to react at ...

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Abstract

The invention discloses a preparation method of a barium titanate / silver iodate heterojunction photocatalyst. The preparation method comprises the following steps: firstly, preparing BaTiO3; preparing BaTiO3 powder, adding the BaTiO3 powder into an AgNO3 aqueous solution, adding a KIO3 solution, carrying out a room temperature precipitation reaction, and washing and drying the product to finally obtain the BaTiO3 / AgIO3 heterogeneous photocatalyst. The preparation process is simple, the reaction temperature is low, the reaction time is short, the material cost is low, the method is suitable for industrial production, and the BaTiO3 / AgIO3 heterogeneous photocatalyst obtained through the method is more in active sites, higher in photon-generated carrier separation efficiency, capable of being used repeatedly in the degradation process, better in performance and excellent in dye photocatalytic degradation performance.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a method for preparing a barium titanate / silver iodate heterojunction photocatalyst. Background technique [0002] In 1972, Fujishima and Honda found in TiO 2 After the semiconductor electrode can photocatalytically decompose water to produce hydrogen, semiconductor photocatalysis technology has attracted extensive attention of scientific researchers. Photocatalytic technology has the advantages of mild conditions, economy, high efficiency and less secondary pollution. This technology can convert solar energy into chemical energy, such as photocatalytic hydrogen production and photocatalytic reduction of carbon dioxide. In recent years, semiconductor photocatalysis has been used in air Purification, antibacterial and antibacterial and agriculture and other fields. Although photocatalytic technology has broad application prospects, there are still many problems in its large-scale i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66C02F1/30C02F101/30
CPCB01J23/66C02F1/30C02F2305/10C02F2101/30B01J35/39
Inventor 崔永飞孙欢欢郭鹏党培培
Owner SHAANXI UNIV OF SCI & TECH
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