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Ternary compound photocatalyst and preparation and application methods thereof

A photocatalyst, ternary composite technology, applied in catalyst activation/preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc. Effects of interfacial electron transfer efficiency and excellent visible light water splitting for hydrogen production

Active Publication Date: 2019-09-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of these composite photocatalysts is relatively complicated, requiring chemical initiators and reducing agents to react

Method used

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  • Ternary compound photocatalyst and preparation and application methods thereof
  • Ternary compound photocatalyst and preparation and application methods thereof
  • Ternary compound photocatalyst and preparation and application methods thereof

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preparation example Construction

[0036] The present invention provides a method for preparing the above-mentioned ternary composite photocatalyst, comprising: S1) mixing MOFs and noble metal salts in a first solvent, and then irradiating to obtain MOFs of composite noble metals; S2) mixing MOFs of the composite noble metals MOFs, sulfur sources and metal salts are mixed in a second solvent, and then irradiated to obtain a ternary composite photocatalyst.

[0037] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0038] Among them, the MOFs are preferably titanium-based organic framework materials, chromium-based organic framework materials and zirconium-based organic framework materials, more preferably MIL-125, MIL-125-NH 2 , MIL-101, UIO-66 and UIO-66-NH 2One of them; the MOFs are preferably prepared according to the following steps: mixing metal sources and organic ligands in a solvent, heating for solvothermal reaction, and obtaini...

Embodiment 1

[0052] Take CdS / Pt / MIL-125 ternary composite photocatalyst as an example:

[0053] 1.1 Put a mixture of titanium isopropoxide (0.312mL), terephthalic acid (0.60g), 1.2mL methanol and 9mL N,N-dimethylformamide into a 25mL polytetrafluoroethylene liner and stir at room temperature After uniformity, it was sealed in a stainless steel autoclave and heated at 130°C for 15 hours. Finally, after natural cooling, they were washed with N,N-dimethylformamide, methanol and acetone respectively and centrifuged, the white powder was collected by filtration, and dried in vacuum at 50°C for 12 hours to obtain MIL-125.

[0054] 1.2 Disperse 40 mg of the MIL-125 obtained in 1.1 in 10 mL containing 1.5 mg K 2 PtCl 4 After ultrasonic treatment for 10 minutes at room temperature, the glass bottle containing the mixed solution was further stirred for 24 hours; the impregnated MIL-125 sample was obtained by centrifugation; and the impregnated sample was dispersed by ultrasonic treatment for 10 mi...

Embodiment 2

[0061] The ternary composite photocatalyst was prepared in the same manner as in Example 1 except that the content of supported noble metal was changed.

[0062] When 40mg of MIL-125 is dispersed in 10mL containing 3mg K 2 PtCl 4 In absolute ethanol solution, the hydrogen production efficiency of the obtained CdS / Pt / MIL-125 ternary composite photocatalyst was 832.03μmol·g -1 h -1 .

[0063] When 40mg of MIL-125 is dispersed in 10mL containing 0.5mg K 2 PtCl 4 In absolute ethanol solution, the hydrogen production efficiency of the obtained CdS / Pt / MIL-125 ternary composite photocatalyst was 1596.37μmol·g -1 h -1 .

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Abstract

The invention provides a preparation method of a ternary compound photocatalyst. The preparation method comprises S1) mixing MOFs (metal-organic frameworks) and noble metal salts in a first solvent and performing irradiation to obtain noble metal-compounded MOFs; S2) mixing the noble metal-compounded MOFs, a sulfur source and metal salts inside a second solvent and performing irradiation to obtain the ternary compound photocatalyst. Compared with the prior art, the preparation method applies irradiation, which is high in penetrating power and can uniformly grow noble metal and metal sulfide nanoparticles on the MOFs substrate; meanwhile, the porous structure of the MOFs can effectively limit the size of the metal sulfide nanoparticles to avoid particle agglomeration and inhibit compounding photo-induced electron-hole pairs; meanwhile, with the Schottky barriers formed by noble metals and the MOFs, the efficiency the ternary compound photocatalyst for separating the photo-induced electron-hole pairs can be enhanced, and further the ternary compound photocatalyst is excellent in performance when applied to hydrogen production through water decomposition by visible light.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalysts, in particular to a ternary composite photocatalyst, its preparation method and application. Background technique [0002] The global energy shortage and environmental pollution problems have promoted the in-depth research on new energy sources. To solve this challenging problem, the use of solar energy for photocatalytic water splitting to produce hydrogen is a promising solution, because hydrogen energy is eco-friendly and has high thermal conversion efficiency, it is considered to be the " Green" energy. However, hydrogen production is difficult due to the electron transfer process involved. Therefore, the selection of efficient and stable photocatalysts is one of the key factors to achieve photocatalytic water splitting. [0003] As an emerging crystalline material, metal-organic frameworks (MOFs) have great potential applications in fields such as catalysis due to their uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/26B01J37/02B01J37/34C01B3/04
CPCB01J31/1691B01J31/26B01J37/0201B01J37/341C01B3/042C01B2203/1082C01B2203/1041C01B2203/0277B01J35/39Y02E60/36
Inventor 刘华蓉邰晨
Owner UNIV OF SCI & TECH OF CHINA
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