Photocatalyst lanthanum phosphate and its preparation method and application

A photocatalyst, lanthanum phosphate technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of restricting the practical application of photocatalytic technology, low quantum efficiency, low solar energy utilization rate, etc. It is beneficial to large-scale promotion, the preparation method is simple and feasible, and the synthesis conditions are mild.

Inactive Publication Date: 2016-09-07
FUZHOU UNIV
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Problems solved by technology

In recent years, semiconductor photocatalytic technology has attracted extensive attention from scientists in many fields due to its important application prospects in the fixation and conversion of carbon dioxide. However, due to the traditional TiO 2 The shortcomings of low quantum efficiency and low utilization rate of solar energy in photocatalysts restrict the practical application of photocatalytic technology. Therefore, the successful development and design of new high-efficiency photocatalysts is one of the key technologies for the use of solar energy to achieve carbon dioxide fixation and conversion.

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  • Photocatalyst lanthanum phosphate and its preparation method and application
  • Photocatalyst lanthanum phosphate and its preparation method and application
  • Photocatalyst lanthanum phosphate and its preparation method and application

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Experimental program
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preparation example Construction

[0019] The preparation method of the photocatalyst is a hydrothermal method:

[0020] The specific steps are as follows: Dissolve one of sodium phosphate, sodium hydrogen phosphate, ammonium phosphate, and ammonium hydrogen phosphate as a phosphorus source in deionized water to prepare a phosphorus source solution with a concentration of 0.1 to 1 mol / L; it will be used as a lanthanum source One of solid lanthanum chloride, lanthanum nitrate or lanthanum acetate is dissolved in deionized water to prepare a lanthanum source solution with a concentration of 0.01~0.1 mol / L; the phosphorus source solution is added dropwise to the lanthanum source solution while stirring. Then adjust the reaction solution to different pH with dilute ammonia water, continue to stir for 30~180 minutes, transfer it into the autoclave for reaction at 90~240℃ for 12~24 hours, cool to room temperature naturally, wash the precipitate with water and ethanol and centrifuge several times (to Ion concentration <1...

Embodiment 1

[0021] Example 1, LaPO 4 Catalyst preparation

[0022] Weigh 0.003 mol (NH 4 ) 2 HPO 4 The solid was dissolved in 30 mL deionized water to prepare (NH 4 ) 2 HPO 4 Solution; weigh out 0.003 mol La(NO 3 ) 3 ·6H 2 O solid was dissolved in 50 mL of deionized water to prepare a lanthanum nitrate solution, and the prepared (NH 4 ) 2 HPO 4 The solution, then adjust the pH of the solution to 8 with dilute ammonia, continue to stir for 30 minutes, transfer the mixed solution into the autoclave, keep the temperature at 180 ℃ for 24 hours, naturally cool to room temperature, centrifuge the resulting precipitate, wash, 80 ℃ normal pressure Dry for 24 hours and grind to obtain white LaPO 4 powder.

Embodiment 2

[0023] Example 2, LaPO 4 Catalyst preparation

[0024] Weigh 0.001 mol Na 3 PO 4 The solid is dissolved in 30 mL deionized water to prepare Na 3 PO 4 Solution; weigh 0.001 mol La(NO 3 ) 3 ·6H 2 The O solid was dissolved in 50 mL of deionized water to prepare a lanthanum nitrate solution, and the prepared Na was added dropwise to the lanthanum nitrate solution while stirring. 3 PO 4 The solution, then adjust the pH of the solution to 11 with dilute ammonia water, continue to stir for 60 minutes, transfer the mixed solution into the autoclave, keep the temperature at 120 ℃ for 12 hours, naturally cool to room temperature, centrifuge the resulting precipitate, wash, 60 ℃ normal pressure Dry for 12 hours and grind to obtain white LaPO 4 powder.

[0025] figure 1 Demonstrated the new photocatalyst LaPO of the present invention 4 X-ray diffraction pattern (XRD), from which you can find the prepared LaPO 4 LaPO with pure hexagonal phase 4 (JCPDS: 04-0635).

[0026] figure 2 Demonstrated th...

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Abstract

The invention provides a photocatalyst LaPO4 as well as a preparation method and an application thereof. The photocatalyst LaPO4 prepared with a hydrothermal method is applied to photochemical catalysis to reduce carbon dioxide and water to prepare methane and hydrogen. LaPO4 is firstly applied to the photocatalysis field. The preparation method is simple, complicated and expensive equipment is not required, the synthesis condition is mild, and large-scale popularization is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of preparation of new materials and photocatalytic reduction of carbon dioxide, and specifically relates to the photocatalyst lanthanum phosphate (LaPO 4 ) And its preparation method and application. Background technique [0002] With the increasingly serious environmental problems such as the energy crisis and the greenhouse effect, the sustainable development of human society is facing huge challenges. How to effectively use solar energy to achieve the fixation and conversion of carbon dioxide has attracted widespread attention from all over the world. In recent years, semiconductor photocatalysis technology has received extensive attention from scientists in many fields due to its important application prospects in the fixation and conversion of carbon dioxide. However, due to the traditional TiO 2 Based photocatalysts have shortcomings such as low quantum efficiency and low solar energy utilization, which rest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18B01D53/86B01D53/62C07C9/04C07C1/02C01B3/04
CPCY02E60/36
Inventor 苏文悦潘宝罗时建王绪绪付贤智王心晨陈旬戴文新
Owner FUZHOU UNIV
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