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Zr-MOF modified ZnCdS nano microsphere composite material and application thereof

A technology of nano-microspheres and composite materials, which can be used in organic compound/hydride/coordination complex catalysts, inorganic chemistry, hydrogen and other directions, which can solve application limitations, large band gaps, and photocatalytic activity of photocatalysts that cannot meet basic requirements. and other problems, to achieve the effects of multiple active sites, excellent hydrogen production performance, and good recyclability

Inactive Publication Date: 2019-08-23
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, Cd 0.5 Zn 0.5 The photocatalytic activity of S photocatalysts is far from meeting the basic requirements for practical applications.
Therefore, the development of Cd 0.5 Zn 0.5 New pathways for S photocatalyst modification are highly desirable; metal-organic frameworks (MOFs) possess high specific surface area, tunable pore size, highly exposed active centers, and flexible structure, which have attracted attention in However, due to the large band gap (3.5 eV) of UIO-66(Zr), which can only absorb ultraviolet light, its application in visible light catalysis is limited.

Method used

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  • Zr-MOF modified ZnCdS nano microsphere composite material and application thereof
  • Zr-MOF modified ZnCdS nano microsphere composite material and application thereof
  • Zr-MOF modified ZnCdS nano microsphere composite material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Dissolve 1 mmol of zirconium chloride and 1 mmol of terephthalic acid in 30 mL of DMF and sonicate until complete

[0031] After completely dissolving, transfer it to a 50 mL polytetrafluoroethylene reactor liner, cover and seal it, put it in an oven, heat at 120 °C for 24 h, and after cooling down to room temperature, the product is washed several times with DMF and methanol respectively, and the After vacuum drying at 80 ℃, the metal-organic framework Zr-MOF was obtained, which was named UIO-66(Zr).

[0032]2) Weigh 80.7 mg, 121 mg, 181.5 mg, 282.3 mg of UIO-66(Zr) obtained in step (1) into four beakers (representing the moles of UIO-66(Zr) added to the composite material 40%, 50%, 60%, 70%), add 5mL of water, ultrasonic treatment to obtain uniformly dispersed suspensions A1, A2, A3, A4, take four other beakers, respectively weigh 0.5 mmol cadmium acetate and 0.5 Mmol zinc acetate, measure 15 mL of water, stir for 30 min until uniformly dispersed to obtain suspens...

Embodiment 2

[0038] 1) The composite material catalyst obtained in Example 1 is subjected to photocatalytic hydrogen production with visible light.

[0039] 2) Under the irradiation of visible light, the hydrogen production experiment was carried out in a closed quartz reaction system. The temperature of the reaction system was kept at 6 °C by cooling circulating water, and 50 mg of catalyst was dispersed in an aqueous solution of 0.25 M sodium sulfide and 0.35 M sodium sulfite ( 80mL), in which sodium sulfide and sodium sulfite were used as sacrificial agents, the air was completely removed under continuous stirring, and a 300W Xe arc lamp with a 420nm filter (CEL-HXF300) was used as a light source, and online gas chromatography (FULI, GC -7920) for hydrogen evolution analysis. After the light starts, samples are taken every 1 hour to get Figure 5 The hydrogen production histogram is shown. It can be concluded that when the weight of UIO-66(Zr) is added to 50%, the hydrogen production ...

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Abstract

The invention discloses a bimetallic sulfide-based composite material, preparation of the nano composite catalytic material of which the ZnCdS nano microspheres and the organic framework material forma heterostructure and an application of the composite material in photocatalytic hydrogen production, and belongs to the technical fields of nanomaterial preparation and green energy sources. The composite material of the bimetallic sulfide nano microspheres and the metal organic framework (MOF) using Zr as a metal center is prepared by using a one-step hydrothermal method; and the method comprises the following steps: firstly performing a solvothermal reaction by utilizing zirconium chloride and terephthalic acid as raw materials to synthesize a square block shaped Zr metal organic frameworkmaterial (called UIO-66(Zr) for short), and further synthesizing the ZnCdS nano microsphere modified metal organic framework UIO-66(Zr) nano composite material by utilizing cadmium acetate and zinc acetate. The nano composite material provided by the invention has excellent catalytic activity in the photocatalytic hydrogen production.

Description

technical field [0001] The invention belongs to the field of nano-material preparation technology and green energy, and in particular relates to a preparation method of a Zr-MOF modified ZnCdS nano-microsphere composite material and its application in photocatalytic hydrogen production. Background technique [0002] Energy is an inseparable energy carrier for human survival, life and development. The excessive development and utilization of fossil energy has made the problem of environmental pollution more and more serious. In order to cope with the depletion of fossil fuels and the further deterioration of environmental conditions, people have conducted a lot of research on green and renewable energy. Among renewable energy sources, solar energy is the largest exploitable resource, and semiconductor-based photocatalytic hydrogen production technology is widely considered as a promising route to convert solar energy into chemical fuels, rationally designing sustainable and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/22B01J35/08B01J35/10C01B3/04
CPCB01J31/26B01J31/1691C01B3/042B01J2531/48B01J2531/0213B01J35/23B01J35/51B01J35/617B01J35/647B01J35/39Y02E60/36
Inventor 侯东芳邓敏汤凡黄磊乔秀清李东升兰亚乾吴涛卜贤辉
Owner CHINA THREE GORGES UNIV
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