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A kind of i-doped bismuth-based oxyhalide photocatalyst and its preparation method and application

A technology of photocatalysts and oxyhalides, which is applied in the field of photocatalytic materials and can solve the problems of photogenerated hole oxidation and photocorrosion of halogen anions

Active Publication Date: 2022-04-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the halogen anion (X np orbital) in most oxyhalide photocatalysts such as BiOX is easily oxidized by the photogenerated holes near the top of the valence band (VBM) under light, and then photocorrosion occurs. It is critical to maintain a stable photocatalyst that satisfies both hydrogen and oxygen production reactions

Method used

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  • A kind of i-doped bismuth-based oxyhalide photocatalyst and its preparation method and application
  • A kind of i-doped bismuth-based oxyhalide photocatalyst and its preparation method and application
  • A kind of i-doped bismuth-based oxyhalide photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1: molten salt method prepares I-Bi 2 GO 4 Cl

[0055] Take 2.425 g Bi(NO3 ) 3 ·5H 2 O was dissolved in 30 mL ethanol, 0.83 g KI was dissolved in 10 mL water (Bi:I molar ratio was 1:1), the two were mixed and stirred continuously for 5 hours, washed with ethanol and water three times, and dried by centrifugation to obtain BiOI . Take 0.5 gBi 2 o 3 , 0.389 g Gd 2 o 3 , 0.755 g BiOI (Bi:Gd:I molar ratio is 2:1:1) was mixed and ground for 40 minutes, then 0.627 g NaCl and 0.8 g KCl were added to continue grinding for 20 minutes, and put into the muffle furnace at 10 K / min The heating rate was increased to 1073 K, the temperature was kept constant for 20 h, and it was taken out after cooling down to room temperature. The samples were subsequently washed with hot water, centrifuged and dry-milled to obtain I-doped Bi 2 GO 4 Cl, denoted as I-Bi 2 GO 4 Cl.

[0056] The composition and crystallinity of the phases in the product were measured by an X-ray...

Embodiment 2

[0058] Embodiment 2: molten salt method prepares I-Bi 2 SmO 4 Cl

[0059] Take 2.425 g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 30 mL ethanol, 0.83 g KI was dissolved in 10 mL water (Bi:I molar ratio was 1:1), the two were mixed and stirred continuously for 5 hours, washed with ethanol and water three times respectively, and BiOI was obtained after centrifugal drying. . Take 0.45 gBi 2 o 3 , 0.337 g Sm 2 o 3 , 0.68 g BiOI (Bi:Sm:I molar ratio is 2:1:1) mixed and ground for 40 minutes, then added 0.565 g NaCl and 0.72 g KCl to continue grinding for 20 minutes, and put it into the muffle furnace at 10 K / min The heating rate was increased to 1073 K, the temperature was kept constant for 20 h, and it was taken out after cooling down to room temperature. The samples were subsequently washed with hot water, centrifuged and dry-milled to obtain I-doped Bi 2 SmO 4 Cl, denoted as I-Bi 2 SmO 4 Cl.

[0060] The composition and crystallinity of the phases in the product were me...

Embodiment 3

[0062] Embodiment 3: Molten salt method prepares the Bi of different I doping content 2 GO 4 Cl

[0063] (1) Bi without doping I 2 GO 4 Preparation of Cl: Take 0.5 g Bi 2 o 3 , 0.389 g Gd 2 o 3 , 0.559 g BiOCl (Bi:Gd:Cl molar ratio 2:1:1) was mixed and ground for 40 minutes, then 0.627 g NaCl and 0.8 g KCl were added to continue grinding for 20 minutes, and put into the muffle furnace at 10 K / min The heating rate was increased to 1073 K, and the temperature was kept constant for 20 h. After cooling down to room temperature, it was taken out. The catalytic material obtained after grinding was denoted as 0I-Bi 2 GO 4 Cl (undoped sample). Among them, BiOCl was purchased from commercially available products.

[0064] (2) 0.2I-Bi 2 GO 4 Preparation of Cl (I:Gd molar ratio is 0.2): take 0.9 g Bi respectively 2 o 3 , 0.389g Gd 2 o 3 and 0.151 g BiOI (Bi:Gd:I molar ratio 2:1:0.2) were prepared according to the above (1) steps to obtain I-doped Bi 2 GO 4 Cl catalytic ...

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Abstract

The invention belongs to the technical field of photocatalytic materials, in particular to an I-doped bismuth-based oxyhalide photocatalyst and its preparation method and application. The chemical composition of the bismuth-based oxyhalide is Bi 2 MO 4 Cl, wherein M=Gd, Sm; [Bi 2 MO 4 ] + and [Cl] − The layers are stacked alternately, with a perovskite-like layered crystal configuration. The photocatalyst is prepared by molten salt method, bismuth oxide Bi 2 o 3 , M 2 o 3 It is mixed and ground evenly with bismuth oxyiodide BiOI, added into a salt reaction medium to continue grinding, and then calcined at high temperature, washed and dried to obtain the photocatalyst. And for the first time, this kind of material was applied to the photocatalytic water splitting system, which achieved high oxygen production activity under visible light and hydrogen production activity under full spectrum, and showed good photochemical stability.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to an I-doped bismuth-based oxyhalide photocatalyst and a preparation method and application thereof. Background technique [0002] Energy and environmental pollution are two major challenges faced by human beings in the 21st century. Hydrogen is a clean energy with high combustion value and high efficiency. Therefore, hydrogen production from water splitting by solar energy is one of the most effective ways to solve the above challenges. In order to improve the efficiency of solar hydrogen production, the key point is to develop high-efficiency photocatalysts. [0003] The existing photocatalytic materials responsive to visible light generally include the following categories: nitrogen (oxygen) compounds, halogen (oxygen) compounds, sulfur (oxygen) compounds and a small amount of oxides. Among them, oxides have always been the research focus of scienti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06B01J27/13B01J37/00B01J37/08C01B3/04
CPCB01J27/06B01J27/13B01J37/0036B01J37/08B01J37/082C01B3/042B01J35/39Y02E60/36
Inventor 董贝贝宋向瑶王瑞虎赵聪慧徐洋
Owner HEBEI UNIV OF TECH