Synthesis method and application of layered perovskite type photocatalyst

A synthesis method and perovskite-type technology are applied in the synthesis field of layered perovskite-type photocatalysts, which can solve the problems in the field of photocatalysis without application, and achieve excellent water splitting performance, strong morphology controllability, and synthesis Simple effects of routes and installations

Active Publication Date: 2021-03-19
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, currently for Sr 2 Bi 4 Ti 5 o 18 The research is mainly focused on its application in ferroelectric ceramics, and has not been applied in the field of photocatalysis

Method used

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  • Synthesis method and application of layered perovskite type photocatalyst
  • Synthesis method and application of layered perovskite type photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Measure 30mL 4mol / L nitric acid solution and pour it into a beaker, press Sr 2 Bi 4 Ti 5 o 18 The stoichiometric ratio weighs 1.5mmol SrCl 2 ·6H 2 O, 1.5mmol Bi 2 (SO 4 ) 3 . 3.75 mmol of tetrabutyl titanate was dissolved in nitric acid solution and stirred for 10 min to obtain a raw material solution.

[0024] 2. Dissolve 7.2g of NaOH in 30mL of deionized water, stir for 5 minutes, and wait for it to cool to room temperature to obtain a sodium hydroxide solution.

[0025] 3. While stirring, use a dropper to drop the raw material liquid into the sodium hydroxide solution. After the dropwise addition is completed, stir for another 30 minutes to make it evenly mixed. After the reaction was completed, the reaction liquid was cooled to normal temperature, then centrifuged to collect the precipitate, washed with ethanol and deionized water three times, dried in an oven at 60°C for 10 h, and ground into powder to obtain Sr 2 Bi 4 Ti 5 o 18 Photocatalyst 1#.

[0...

Embodiment 2

[0029] 1. Measure 28.4mL 4.3mol / L nitric acid solution and pour it into a beaker, press Sr 2 Bi 4 Ti 5 o 18 The stoichiometric ratio weighs 1.5mmol SrCl 2 ·6H 2 O, 3mmol Bi(NO 3 ) 3 ·5H 2 O. 3.75 mmol of tetrabutyl titanate was dissolved in nitric acid solution, and stirred for 10 min to obtain a raw material solution.

[0030] 2. Dissolve 8.4g NaOH in 30mL deionized water, stir for 5min, and wait for it to cool to room temperature to obtain a sodium hydroxide solution.

[0031] 3. While stirring, use a dropper to drop the raw material liquid into the sodium hydroxide solution. After the dropwise addition is completed, stir for another 60 minutes to make it evenly mixed. After the reaction was completed, the reaction liquid was cooled to normal temperature, and then the precipitate was collected by centrifugation, washed three times with ethanol and deionized water, dried in an oven at 67°C for 9 hours, and ground into powder to obtain Sr 2 Bi 4 Ti 5 o 18 Photocata...

Embodiment 3

[0035] 1. Measure 26.7mL 4.6mol / L nitric acid solution and pour it into a beaker, press Sr 2 Bi 4 Ti 5 o 18 The stoichiometric ratio weighs 1.5mmol SrCl 2 ·6H 2 O, 1.5mmol Bi 2 (SO 4 ) 3 . 3.75 mmol of tetrabutyl titanate was dissolved in nitric acid solution and stirred for 10 min to obtain a raw material solution.

[0036] 2. Dissolve 9.6g NaOH in 30mL deionized water, stir for 5min, and wait for it to cool to room temperature to obtain a sodium hydroxide solution.

[0037] 3. While stirring, use a dropper to drop the raw material liquid into the sodium hydroxide solution. After the dropwise addition is completed, stir for another 90 minutes to make it evenly mixed. After the reaction was completed, the reaction liquid was cooled to normal temperature, and then the precipitate was collected by centrifugation, washed three times with ethanol and deionized water, dried in an oven at 73°C for 8 hours, and ground into powder to obtain Sr 2 Bi 4 Ti 5 o 18 Photocatalys...

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Abstract

The invention discloses a synthesis method of a layered perovskite type photocatalyst, which comprises the following steps: (1) dissolving SrCl2.6H2O, a bismuth source and tetrabutyl titanate in a nitric acid solution to obtain a raw material solution; (2) dropwise adding the obtained raw material solution into a sodium hydroxide solution, and then carrying out hydrothermal synthesis to obtain a white turbid liquid; and (3) cooling and filtering the turbid liquid, taking filter residues, and washing and drying the filter residues to obtain the layered perovskite type Sr2Bi4Ti5O18. The invention also discloses an application of the layered perovskite type photocatalyst in a photocatalytic reaction. The preparation process is simple, the reaction controllability is good, the formed layered perovskite type Sr2Bi4Ti5O18 is high in light absorption capacity, wide in light absorption range and high in photo-generated carrier activity, and the photocatalytic hydrogen production capacity is 3.2 times or above that of traditional TiO2, 2.8 times or above that of solid-phase sintering synthesis and 2 times or above that of Bi4Ti3O12.

Description

technical field [0001] The invention relates to a synthesis method and application of a layered perovskite photocatalyst, belonging to the field of photocatalysts. Background technique [0002] With the continuous increase of the world's population and the rapid development of industrialization, energy consumption and energy demand remain high, and the resulting two major problems of energy crisis and environmental pollution have attracted more and more attention. In recent years, photocatalytic technology has developed rapidly, and its pollutant decomposition efficiency and hydrogen production efficiency have been continuously improved. However, most of the current semiconductor materials have short lifetime of photogenerated carriers, short average diffusion length, low separation efficiency of photogenerated electron-hole pairs, and low photocatalytic activity. Their photocatalytic performance is far from meeting the needs of practical applications. . [0003] Perovskit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C01B3/04
CPCB01J23/18B01J35/004C01B3/042C01B2203/0277Y02E60/36
Inventor 师红旗张健郎俊杰汤涛丁毅沈晓冬
Owner NANJING TECH UNIV
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