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Synthesis method and application of a layered perovskite photocatalyst

A technology of perovskite type and synthesis method, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems in the field of photocatalysis, and achieve Excellent water splitting performance, high product purity, simple synthesis route and device

Active Publication Date: 2022-06-03
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 a layered perovskite photocatalyst
  • Synthesis method and application of a layered perovskite photocatalyst

Examples

Experimental program
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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, and then the precipitate was collected by centrifugation, washed three times with ethanol and deionized water, dried in an oven at 60°C for 10 h, and ground into powder to obtain Sr 2 Bi 4 Ti 5 o 18 Photocat...

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 method for synthesizing a layered perovskite photocatalyst. The steps are: (1) adding SrCl 2 ·6H 2 O, bismuth source and tetrabutyl titanate are dissolved in nitric acid solution to obtain a raw material solution; (2) the gained raw material solution is added dropwise in a sodium hydroxide solution, and then hydrothermally synthesized to obtain a white suspension; (3) Cool and filter the suspension, take the filter residue, wash and dry the filter residue to obtain layered perovskite Sr 2 Bi 4 Ti 5 o 18 . Also disclosed is the application of the layered perovskite photocatalyst in photocatalytic reactions. The preparation process of the present application is simple, the reaction controllability is good, and the formed layered perovskite type Sr 2 Bi 4 Ti 5 o 18 Strong light absorption ability, wide light absorption range, high photogenerated carrier activity, and strong photocatalytic hydrogen production ability are traditional TiO 2 3.2 times more than that of solid-phase sintering synthesis, which is more than 2.8 times that of Bi 4 Ti 3 o 12 more than 2 times.

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 Patents(China)
IPC IPC(8): B01J23/18C01B3/04
CPCB01J23/18C01B3/042C01B2203/0277B01J35/39Y02E60/36
Inventor 师红旗张健郎俊杰汤涛丁毅沈晓冬
Owner NANJING TECH UNIV
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