Alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and preparation method and application thereof

A cobalt phosphate nanometer, photocatalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high efficiency and low cost, and achieve good visible light catalytic oxygen production performance , Visible light catalytic oxygen production performance improvement, the effect of promoting effective combination

Active Publication Date: 2017-11-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although existing studies have reported a variety of visible light-responsive photocatalysts, the results of the research are still far from the requirements of high efficiency and low cost.

Method used

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  • Alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and preparation method and application thereof
  • Alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and preparation method and application thereof
  • Alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Take 0.04 mol of citric acid monohydrate, 0.01 mol of tetraisopropyl titanate, 0.01 mol of lanthanum nitrate hexahydrate and 0.16 mol of ethylene glycol in sequence, add them into 50 mL of methanol and stir to dissolve to obtain a transparent colloid. The transparent colloid was placed in an oil bath at 70° C. for 4 h, followed by an oil bath at 130° C. for 20 h, and then naturally cooled to room temperature to obtain a brown gel substance. Afterwards, the brown gel substance was heated in an oven at 200° C. for 4 h and then naturally cooled to room temperature to obtain a brown-black powder. Then transfer the brown-black powder to an ash furnace, calcine at 250°C for 1 hour, then cool to room temperature naturally, then heat up to 350°C for 1 hour in the ash furnace, then continue to heat up to 500°C for 12 hours, and then cool to room temperature naturally. In order to ensure the removal of the organic matter, the white precursor powder is obtained. Perform high-t...

Embodiment 2

[0040] 1) Take 0.05 mol of citric acid monohydrate, 0.001 mol of tetraisopropyl titanate, 0.001 mol of lanthanum nitrate hexahydrate and 0.2 mol of ethylene glycol in sequence, add them into 80 mL of methanol and stir to dissolve to obtain a transparent colloid. The transparent colloid was placed in an oil bath at 60°C for 6h, followed by an oil bath at 120°C for 24h, and then naturally cooled to room temperature to obtain a brown gel substance. Afterwards, the brown gel substance was heated in an oven at 200° C. for 2 h and then naturally cooled to room temperature to obtain a brown-black powder. Then transfer the brown-black powder to the ash furnace, calcine at 250°C for 1.5h, then cool to room temperature naturally, then heat up to 350°C for 1.5h in the ash furnace, then continue to heat up to 500°C for 15h, and then cool naturally to Room temperature to ensure the removal of organic matter, that is, to obtain white precursor powder. Perform high-temperature ammonia post-...

Embodiment 3

[0043] 1) Take 0.06 mol of citric acid monohydrate, 0.005 mol of tetraisopropyl titanate, 0.005 mol of lanthanum nitrate hexahydrate and 0.24 mol of ethylene glycol in sequence, add them into 120 mL of methanol and stir to dissolve to obtain a transparent colloid. The transparent colloid was placed in an oil bath at 90° C. for 2 h, followed by an oil bath at 150° C. for 18 h, and then naturally cooled to room temperature to obtain a brown gel substance. Afterwards, the brown gel substance was heated in an oven at 200° C. for 3 h and then naturally cooled to room temperature to obtain a brown-black powder. Then transfer the brown-black powder to the ash furnace, calcine at 250°C for 2 hours, then cool to room temperature naturally, then heat up to 350°C for 2 hours in the ash furnace, then continue to heat up to 500°C for 18 hours, and then cool to room temperature naturally. In order to ensure the removal of the organic matter, the white precursor powder is obtained. Perform ...

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Abstract

The invention provides an alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing LaTiO2N by a polymerization complexation method and a high-temperature ammonia gas posttreatment means; then, growing Co3(OH)2(HPO4)2 nanoneedles on the LaTiO2N in situ by a hydrothermal method to obtain a target product. The alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst prepared by the preparation method provided by the invention has special morphology, and special heterojunctions are established between the LaTiO2N and the Co3(OH)2(HPO4)2 nanoneedles, so that compared with pure LaTiO2N, the LaTiO2N photocatalyst compounded with the Co3(OH)2(HPO4)2 nanoneedles has better catalytic oxygen production performance under visible light, and improvement on the catalytic oxygen production performance of the pure LaTiO2N under visible light is achieved.

Description

technical field [0001] The invention belongs to the technical field of sunlight photocatalytic water splitting, and relates to photocatalytic water splitting oxygen production technology, that is, a photocatalytic oxygen production technology using water as a raw material under the condition of simulating sunlight and visible light irradiation, in particular to a LTON (LaTiO 2 In situ hydrothermal growth of basic cobalt phosphate (Co 3 (OH) 2 (HPO 4 ) 2 ) nanoneedle method and its application in photocatalytic oxygen production. Background technique [0002] Energy is a material resource in nature that can provide some form of energy for human beings. For a country, energy is an important material foundation of the national economy, and the future destiny of the country depends on the control of energy. In a sense, the development of human society is inseparable from the emergence of high-quality energy and the use of advanced energy technologies. At present, due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10C01B13/02
CPCB01J27/24B01J35/004B01J37/10C01B13/0207
Inventor 师进文张亚周宗世超关祥久耿嘉锋程诚郭烈锦
Owner XI AN JIAOTONG UNIV
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