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Hollow zinc copper selenide/zinc sulfide/zinc titanate nano composite material as well as preparation method and application thereof

A technology of hollow zinc titanate and empty zinc titanate, which is applied in the field of photocatalysis, can solve the problems of wide band gap of photocatalysts and high recombination rate of photogenerated electrons and holes, and achieve large-scale production, abundant raw material resources, and low production costs Effect

Active Publication Date: 2022-06-03
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of wide band gap of single-component photocatalyst and high recombination rate of photogenerated electrons and holes, the present invention provides a kind of hollow zinc titanate nanosphere as the substrate, and the outer layer is coated with zinc sulfide shell to obtain zinc sulfide / titanic acid Zinc composite, and then use the aqueous zinc selenide copper quantum dots and zinc sulfide / zinc titanate composite to obtain a hollow zinc selenide copper / zinc sulfide / zinc titanate nanocomposite material, and provide the zinc selenide copper / zinc sulfide / Preparation method of zinc titanate nanocomposite and its application in photocatalytic hydrogen production

Method used

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  • Hollow zinc copper selenide/zinc sulfide/zinc titanate nano composite material as well as preparation method and application thereof
  • Hollow zinc copper selenide/zinc sulfide/zinc titanate nano composite material as well as preparation method and application thereof
  • Hollow zinc copper selenide/zinc sulfide/zinc titanate nano composite material as well as preparation method and application thereof

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Embodiment 1

[0029] The present embodiment provides a method for preparing hollow zinc titanate nanospheres, comprising the following steps:

[0030] (1) 0.2217g of zinc acetate was added to 50mL of N,N-dimethylformamide, and dissolved by magnetic stirring to obtain solution A;

[0031] (2) 0.3451mL of tetrabutyl titanate was added to 49.6541mL of absolute ethanol, and dissolved by magnetic stirring to obtain solution B;

[0032] (3) adding the solution A to the solution B, magnetic stirring, after mixing uniformly, adding 0.35g carbon balls, magnetic stirring for 4.5 h, then centrifuging, washing and drying in turn to obtain the zinc titanate;

[0033] (4) put the zinc titanate described in the step (3) into a muffle furnace, select an air atmosphere, the heating rate is 2°C / min, heat to 500°C to start calcination, and calcine for 300min to obtain the hollow zinc titanate Nanospheres.

Embodiment 2

[0035] The present embodiment provides a preparation method of hollow zinc sulfide / zinc titanate, comprising the following steps:

[0036] (1) 0.2217g of zinc acetate was added to 50mL of N,N-dimethylformamide, and dissolved by magnetic stirring to obtain solution A;

[0037] (2) 0.3451mL of tetrabutyl titanate was added to 49.6541mL of absolute ethanol, and dissolved by magnetic stirring to obtain solution B;

[0038] (3) adding the solution A to the solution B, magnetic stirring, after mixing uniformly, adding 0.35g carbon balls, magnetic stirring for 4.5 h, then centrifuging, washing and drying in turn to obtain the zinc titanate;

[0039] (4) put the zinc titanate described in the step (3) into a muffle furnace, select an air atmosphere, the heating rate is 2°C / min, heat to 500°C to start calcination, and calcine for 300min to obtain the hollow zinc titanate Nanospheres.

[0040] (5) 0.0414g of hollow zinc titanate, 0.3496g of zinc chloride and 0.2891g of thioacetamide w...

Embodiment 3

[0042] The present embodiment provides a preparation method of aqueous zinc-copper selenide quantum dots, comprising the following steps:

[0043] (1) 1 mmol Zn(NO 3 ) 2 ·6H 2 O, 1 mmol Cu(NO 3 ) 2 ·3H 2 O, 200 mL of deionized water and 352.1 μL of 3-mercaptopropionic acid were sequentially added to the three-necked flask, stirred evenly, and adjusted to pH 11.00 with 1 M NaOH solution to obtain solution A;

[0044] (2) Take 0.6 mL of NaHSe solution with a concentration of 0.6667M and quickly inject it into solution A, and after the reaction is stable, heat under reflux at 100° C. for 8 hours to obtain the zinc-copper selenide quantum dot solution.

[0045] The steps (1) and (2) are all carried out in a nitrogen atmosphere.

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Abstract

The invention provides a hollow zinc copper selenide / zinc sulfide / zinc titanate nano composite material, a preparation method thereof and application of the hollow zinc copper selenide / zinc sulfide / zinc titanate nano composite material in photocatalytic hydrogen production. The preparation method of the copper zinc selenide / zinc sulfide / zinc titanate comprises the following steps: (1) synthesizing zinc titanate by using a carbon sphere as a template through an in-situ deposition method, and calcining to form a hollow structure; (2) depositing zinc sulfide on the surface through stirring to obtain zinc sulfide / zinc titanate; (3) synthesizing water-phase zinc copper selenide quantum dots; and (4) compounding the zinc sulfide / zinc titanate with the zinc copper selenide quantum dots to obtain the zinc copper selenide / zinc sulfide / zinc titanate. Besides, when the prepared zinc copper selenide / zinc sulfide / zinc titanate is used as a photocatalyst, the hydrogen production effect of the zinc copper selenide / zinc sulfide / zinc titanate is obviously improved compared with that of zinc titanate, the photocatalytic hydrogen production amount within 6 hours can reach 27787.57 mu mol. G <-1 >, and the material can keep good cycle stability in the photocatalytic hydrogen production process.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a hollow zinc-copper selenide / zinc sulfide / zinc titanate nanocomposite material and a preparation method and application thereof. Background technique [0002] As a green and sustainable hydrogen production method, photocatalytic water splitting has achieved many important progress in recent years. Photocatalysts based on hollow structures, such as copper molybdenum sulfide, zinc titanate, copper cobaltate, etc., have the advantages of distinguishable internal voids, uniform size, low density, high specific surface area, shortened transport length of mass and charge, etc. received widespread attention. However, when these hollow-structured photocatalysts are used alone, there are problems such as insufficient carrier separation and low carrier yield, which limit the further improvement of their photocatalytic performance. Thus, the construction of heterojunctions by mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057C01B3/04
CPCB01J27/0573C01B3/042B01J35/396B01J35/39Y02E60/36
Inventor 韩吉姝彭佳茹韩悦王磊赵瑞阳
Owner QINGDAO UNIV OF SCI & TECH
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