A core-shell structure nanosphere photocatalytic material and its preparation method and application

A technology of photocatalytic materials and core-shell structure, which is applied in the field of core-shell structure nanosphere photocatalytic materials and its preparation, can solve the problems of limiting energy utilization and catalytic efficiency, and achieve improved catalytic efficiency and stability, low cost, The effect of rapid infiltration and diffusion

Active Publication Date: 2021-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As an important II-VI direct bandgap semiconductor material, ZnS has important applications in photocatalysis, optoelectronics and other fields, while pure zinc sulfide can only absorb ultraviolet rays in sunlight due to its wide band gap. Band energy, and the visible light part that accounts for nearly 50% of sunlight energy is not effectively utilized, which greatly limits its energy utilization rate and catalytic efficiency

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  • A core-shell structure nanosphere photocatalytic material and its preparation method and application
  • A core-shell structure nanosphere photocatalytic material and its preparation method and application
  • A core-shell structure nanosphere photocatalytic material and its preparation method and application

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Embodiment 1

[0032] The core-shell structure nanosphere photocatalytic material of the present embodiment, the core-shell structure nanosphere photocatalyst material is made of SiO 2 Nanospheres as the core, with ZnS / CuS x The nanosheet-like structure is the shell; the SiO 2 The diameter of the nanosphere is 300nm-350nm; the diameter of the core-shell nanosphere photocatalytic material is 500nm-600nm; the ZnS / CuS x The molar ratio of Zn element and Cu element is 0.2:1.

[0033] This embodiment also provides a method for preparing the above-mentioned core-shell structure nanosphere photocatalytic material, the method is:

[0034] S1. At room temperature, add 4.2 mL of tetraethyl orthosilicate and 24 mL of ammonia water with a mass fraction of 17% to 80 mL of ethanol, stir and mix for 5 h at a speed of 300 r / min to obtain SiO 2 nanospheres;

[0035] The SiO formed can be adjusted by controlling the amount of ammonia water and tetraethyl orthosilicate, stirring speed and stirring time. 2...

Embodiment 2

[0045] The core-shell structure nanosphere photocatalytic material of the present embodiment, the core-shell structure nanosphere photocatalyst material is made of SiO 2 Nanospheres as the core, with ZnS / CuS x The nanosheet-like structure is the shell; the SiO 2 The diameter of the nanosphere is 200nm-300nm; the diameter of the core-shell nanosphere photocatalytic material is 500nm-600nm; the ZnS / CuS x The molar ratio of Zn element and Cu element is 0.2:1.

[0046] This embodiment also provides a method for preparing the above-mentioned core-shell structure nanosphere photocatalytic material, the method is:

[0047] S1. At room temperature, add 4.2 mL of tetraethyl orthosilicate and 24 mL of ammonia water with a mass fraction of 17% to 80 mL of ethanol, stir and mix for 1 h at a speed of 600 r / min to obtain SiO 2 nanospheres;

[0048] S2, SiO obtained from 30mg of S1 2 Nanospheres were dispersed in 30mL of deionized water, and then 0.8g of urea, 0.5mL of 0.1mol / L copper n...

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Abstract

The invention provides a nanosphere photocatalytic material with a core-shell structure, which is made of SiO 2 Nanospheres as the core, with ZnS / CuS x The nanosheet structure is the shell, and a preparation method is also provided, the method is: adding tetraethyl orthosilicate and ammonia water to ethanol, stirring and mixing to obtain SiO 2 Nanospheres are dispersed in deionized water, urea, copper nitrate aqueous solution and zinc nitrate aqueous solution are added, after hydrothermal reaction, centrifuged and dried to obtain the primary product of core-shell structure, thiourea is added, after hydrothermal reaction, centrifuged and dried, The core-shell structure nanosphere photocatalytic material was obtained. Also provided is the application of the core-shell structure nanosphere photocatalytic material for solar energy splitting water to produce hydrogen. The present invention passes photons in the core SiO 2 Nanosphere and Shell ZnS / CuS x Continuous reflection improves the light energy utilization rate, and can make full use of the light energy of visible light to catalyze the decomposition of water molecules to produce hydrogen gas, which can be precipitated quickly.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a nanosphere photocatalytic material with a core-shell structure and a preparation method and application thereof. Background technique [0002] Hydrogen energy is a clean energy with great development prospects, and how to obtain it cheaply and efficiently has become a worldwide research hotspot. Hydrogen production by splitting water with solar energy is an environmentally friendly and cheap way, which has the characteristics of green, low energy consumption, and low cost, so it has received a lot of attention. [0003] As an important II-VI direct bandgap semiconductor material, ZnS has important applications in photocatalysis, optoelectronics and other fields, while pure zinc sulfide can only absorb ultraviolet rays in sunlight due to its wide band gap. Band energy, while the visible light part, which accounts for nearly 50% of the sunlight energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J35/02B01J35/08B01J35/10C01B3/04
CPCB01J27/04B01J35/004B01J35/0073B01J35/023B01J35/08B01J35/1004C01B3/042C01B2203/0277C01B2203/1076Y02E60/36Y02P20/133
Inventor 朱挺刘国强曾伟
Owner CENT SOUTH UNIV
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