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Lithium niobate type oxide/attapulgite non-linear optical composite photocatalytic material as well as preparation method and application thereof

A nonlinear optics and composite photocatalytic technology, which is applied in the field of lithium niobate oxide/attapulgite nonlinear optical composite photocatalytic material and its preparation, can solve the problems of low utilization rate of sunlight and the like, and achieve enlarged light response. The effect of increasing the range, increasing the contact surface, and improving the utilization rate

Active Publication Date: 2019-04-09
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to make full use of visible light, which accounts for the majority of sunlight energy, and solve the problem of low utilization rate of sunlight, the present invention provides a lithium niobate oxide / attapulgite nonlinear optical composite photocatalytic material, by making LiNbO 3 Crystals grow in situ on attapulgite (ATP), and after high-temperature calcination, the magnesium element (Mg 2+ ) doped into LiNbO 3 Lattice, the introduction of impurity levels reduces the bandwidth, enabling it to be excited in the visible light band, expanding the range of photoresponse

Method used

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  • Lithium niobate type oxide/attapulgite non-linear optical composite photocatalytic material as well as preparation method and application thereof
  • Lithium niobate type oxide/attapulgite non-linear optical composite photocatalytic material as well as preparation method and application thereof
  • Lithium niobate type oxide/attapulgite non-linear optical composite photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 0.3g (0.676mmol) of niobium hydroxide (H 5 Nb 3 o 10 ) into 50ml of 0.2mol / L oxalic acid solution, stirred by the rotor, heated in a water bath at 80°C for 25min to form a transparent solution;

[0028] (2) Drop ammonia solution into the transparent solution formed in step (1), until the white precipitate is completely separated out; wherein the amount of ammonia water is slightly excessive;

[0029] (3) Take the suspension in the middle and lower layers of step (2), centrifuge the precipitate, wash with distilled water, and centrifuge twice, each time at 8000r / min, 2min;

[0030] (4) Dissolve the precipitate in step (3) in 100mL of 0.04mol / L citric acid solution, and dissolve 0.0851g of lithium hydroxide monohydrate (LiOH·H 2 O), molar ratio [Li + ]:[Nb 5+ ]=1:1; heat the water bath to 80°C, after heating for 2 hours, add 1.0g of ATP into the solution; use the sol-gel method, heat the water bath to 80°C, stir with the rotor to form a precursor solution, and heat...

Embodiment 2

[0039] (1) 0.3g (0.676mmol) of niobium hydroxide (H 5 Nb 3 o 10 ) into 50ml of 0.2mol / L oxalic acid solution, stirred by the rotor, heated in a water bath at 80°C for 25min to form a transparent solution;

[0040] (2) Drop ammonia solution into the transparent solution formed in step (1), until the white precipitate is completely separated out; wherein the amount of ammonia water is slightly excessive;

[0041] (3) Take the suspension in the middle and lower layers of step (2), centrifuge the precipitate, wash with distilled water, and centrifuge twice, each time at 8000r / min, 2min;

[0042] (4) Dissolve the precipitate in step (3) in 100mL of 0.04mol / L citric acid solution, and dissolve 0.0851g of lithium hydroxide monohydrate (LiOH·H 2 O), molar ratio [Li + ]:[Nb 5+ ]=1:1, heat the water bath to 80°C, after 2 hours, add 3.0g of ATP into the solution; sol-gel method, keep the temperature of the water bath constant, stir with the rotor to form a precursor solution, heat f...

Embodiment 3

[0047] (1) 0.3g (0.676mmol) of niobium hydroxide (H 5 Nb 3 o 10 ) into 50ml of 0.2mol / L oxalic acid solution, stirred by the rotor, heated in a water bath at 80°C for 25min to form a transparent solution;

[0048] (2) Drop ammonia solution into the transparent solution formed in step (1), until the white precipitate is completely separated out; wherein the amount of ammonia water is slightly excessive;

[0049] (3) Take the suspension in the middle and lower layers of step (2), centrifuge the precipitate, wash with distilled water, and centrifuge twice, each time at 8000r / min, 2min;

[0050] (4) Dissolve the precipitate in step (3) in 100mL of 0.04mol / L citric acid solution, and dissolve 0.0851g of lithium hydroxide monohydrate (LiOH·H 2 O), molar ratio [Li + ]:[Nb 5+ ]=1:1, heat the water bath to 80°C, after 2 hours, add 1.5g of ATP into the solution; sol-gel method, heat the water bath to 80°C, stir with the rotor to form a precursor solution, heat for 4h to steam Dry;...

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Abstract

The invention belongs to the field of chemical new materials and particularly relates to alithium niobate type oxide / attapulgite non-linear optical composite photocatalytic material as well as a preparation method and application thereof. According to the preparation method, LiNbO3 nano-particles with uniform particle sizes are grown on the surfaced of attapulgite in situ by virtue of a sol-gel method, and rich magnesium elements (Mg<2+>) in ATP are doped into LiNbO3 lattices through high-temperature calcination. The preparation method has the beneficial effects that on one hand, by introducing impurity energy level, the bandwidth is decreased, and the stimulation in a visible optical band can be realized, so that the optical response range is increased, and the utilization rate of sunlight is increased; on the other hand, ATP serving as a catalyst carrier has a good dispersion effect, so that the contact surface of the sunlight is increased; besides, ATP has a relatively large specific surface area and a specific pore structure, is capable of exerting specific adsorptive performance and adsorbing partial nitrogen in a photocatalytic nitrogen fixation process and is cooperated withLiNbO3, so that the photocatalytic nitrogen fixation efficiency is improved.

Description

technical field [0001] The invention belongs to the field of new chemical materials, and in particular relates to a lithium niobate oxide / attapulgite nonlinear optical composite photocatalytic material and a preparation method and application thereof. Background technique [0002] The nitrogen fixation methods in nature are mainly through lightning and microbial nitrogen fixation, but the nitrogen fixed in nature is far from meeting the needs of industrial and agricultural production. At present, the artificial nitrogen fixation method widely used in industry is the Haber-Bosch industrial nitrogen fixation method to produce ammonia, but the equipment requirements are high, the energy consumption is large, and the pollution is serious. Therefore, it is of great social significance to develop and develop a green, clean, and low-energy artificial nitrogen fixation process. With the continuous development of heterogeneous photocatalytic technology, photocatalytic nitrogen fixat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20C01C1/04
CPCB01J23/20C01C1/0411Y02P20/52
Inventor 李霞章何承溧苏欢左士祥姚超刘文杰
Owner CHANGZHOU UNIV
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