Preparation method for 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as autoxidation reaction, small specific surface area, photocorrosion, etc., and achieve improved photocatalytic performance, The reaction conditions are simple and the effect of solving the problem of reunion

Active Publication Date: 2020-05-01
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

But in practical application La 2 Ti 2 o 7 did not show high hydrogen production activity, the main reason is that La 2 Ti 2 o 7 The forbidden band width is about 3.6eV, so that it can only absorb ultraviolet light and cannot respond to visible light, and the utilization range of sunlight is very low. At the same time, La 2 Ti 2 o 7 It has a high recombination probability of photogenerated carriers, which seriously restricts the La 2 Ti

Method used

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  • Preparation method for 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst
  • Preparation method for 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst
  • Preparation method for 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Two-dimensional La 2 Ti 2 o 7 Preparation of nanosheets: Weigh 1g Ti(SO 4 ) 2 9H 2 O with 1.8g La(NO 3 )·6H 2 Add O into 60mL of deionized water, stir for 10min, and record it as solution A; dissolve 1g of NaOH in 10mL of deionized water, disperse it ultrasonically, and record it as solution B; under magnetic stirring, add solution B into solution A, and stir 4h, marked as liquid C; transfer liquid C to a reaction kettle, react at 220°C for 20h, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C to obtain La 2 Ti 2 o 7 Nanosheets.

[0032] (2) Two-dimensional nitrogen-doped La 2 Ti 2 o 7 Preparation of nanosheets: 0.3g La 2 Ti 2 o 7 Add the nanosheets to 30mL of triethanolamine, stir vigorously at room temperature for 8-12h, then transfer the mixture to a reaction kettle, react at 220°C for 40h, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C. Obtain N-doped La 2 Ti 2 o 7 Nanosheets.

[0033] (3) Two-dim...

Embodiment 2

[0036] (1) Two-dimensional La 2 Ti 2 o 7 Preparation of nanosheets: Weigh 1.5g Ti(SO 4 ) 2 9H 2 O with 2.7g La(NO 3 )·6H 2 Add O into 60mL of deionized water, stir for 10min, and record it as liquid A; dissolve 1.5g of NaOH in 10mL of deionized water, disperse it ultrasonically, and record it as liquid B; under magnetic stirring, add liquid B into liquid A, Stir for 4 hours and mark it as solution C; transfer solution C to a reaction kettle, react at 230°C for 26 hours, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C to obtain La 2 Ti 2 o 7 Nanosheets.

[0037] (2) Two-dimensional nitrogen-doped La 2 Ti 2 o 7 Preparation of nanosheets: 0.5g La 2 Ti 2 o 7 Add nanosheets to 30mL of triethanolamine, stir vigorously at room temperature for 8-12h, then transfer the mixture to a reaction kettle, react at 230°C for 50h, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C. Obtain N-doped La 2 Ti 2 o 7 Nanosheets.

[0038] (...

Embodiment 3

[0041] (1) Two-dimensional La 2 Ti 2 o 7 Preparation of nanosheets: Weigh 2g Ti(SO 4 ) 2 9H 2 O with 3.6g La(NO 3 )·6H 2 Add O into 60mL of deionized water, stir for 10min, and record it as liquid A; dissolve 2g of NaOH in 10mL of deionized water, disperse it ultrasonically, and record it as liquid B; under magnetic stirring, add liquid B into liquid A, and stir 4h, marked as liquid C; transfer liquid C to the reaction kettle, react at 240°C for 24h, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C to obtain La 2 Ti 2 o 7 Nanosheets.

[0042] (2) Two-dimensional nitrogen-doped La 2 Ti 2 o 7 Preparation of nanosheets: 1g La 2 Ti 2 o 7 Add the nanosheets into 50mL of triethanolamine, stir vigorously at room temperature for 8-12h, then transfer the mixture to a reaction kettle, react at 240°C for 48h, cool to room temperature, centrifuge and wash 3 times, and dry at 60°C. Obtain N-doped La 2 Ti 2 o 7 Nanosheets.

[0043] (3) Two-dimension...

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Abstract

The invention belongs to the technical field of industrial catalysis, and mainly discloses a preparation method for a 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst and an application of the 2D/2D nitrogen-doped lanthanum titanate/sulfur-indium-zinc heterojunction photocatalyst in hydrogen production by photocatalytic decomposition of water under full-lightirradiation. According to the invention, with a nitrogen-doped lanthanum titanate (N-La2Ti2O7) nanosheet as a substrate and polyfunctional trisodium citrate as a surfactant, the ZnIn2S4 nanosheet uniformly grows on the surface of the N-La2Ti2O7 nanosheet under a hydrothermal treatment condition, and a tight contact surface veneering type II-type heterojunction structure is formed between the ZnIn2S4 nanosheet and the N-La2Ti2O7 nanosheet, so the key problem of easy compounding of electron-hole pairs in a photocatalytic reaction process is well solved. The photocatalytic efficiency, the photo-induced electron migration path and the reaction mechanism of the catalyst are further determined through characterization of a photocatalytic water splitting hydrogen production activity test, a scanning electron microscope, a transmission electron microscope, ultraviolet-visible diffuse reflection, a PL fluorescence spectrum and the like. The series of catalysts are simple in preparation process, low in raw material cost, high in activity and applicable to large-scale production and practical application.

Description

technical field [0001] The invention belongs to the technical field of energy catalysis, and relates to a preparation method of a 2D / 2D nitrogen-doped lanthanum titanate / sulfur indium zinc heterojunction photocatalyst for photocatalytically decomposing water to produce hydrogen under full light irradiation. Background technique [0002] Extensive use of petroleum and fossil energy has caused problems such as global warming, environmental pollution, and energy shortages, which are major challenges facing society today. Here, hydrogen, as an efficient and clean secondary energy source, is considered to be an important source of clean energy for the future society. Therefore, the development of pollution-free and low-cost hydrogen production technology has attracted increasing attention. Semiconductor photocatalytic technology decomposes water to produce hydrogen, which is one of the ideal technologies to realize the provision of renewable hydrogen energy for human society. A...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/1088Y02E60/36
Inventor 杨贵东夏梦阳严孝清
Owner XI AN JIAOTONG UNIV
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