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a cevo 4 /ag/g‑c 3 n 4 Composite photocatalyst and preparation method thereof

A technology of catalyst and composite light, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc. Higher requirements and other problems, to achieve the effect of inhibiting recombination, increasing specific surface area, and simple process

Inactive Publication Date: 2018-01-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201410749861.x discloses a g-C3N4 / S-TiO2 / AC photocatalyst and its preparation method and application. However, the preparation process is complex and requires strict control of environmental conditions
Chinese patent 201510249499.4 discloses a metal / metal oxide / g-C3N4 composite photocatalytic material and its preparation method. The oxides of the first metal and the second metal are deposited in sheets, but the raw materials required are mostly noble metals. , and the water-soluble precursor of the first metal is required, and the raw material requirements are relatively high
However, pure g-C 3 N 4 There are the following disadvantages: direct recombination of photogenerated electrons and holes, small specific surface area, and low utilization rate of visible light
Chinese patent 201310751520.1 discloses a CeVO 4 Microsphere photocatalyst and its preparation method, through relatively simple synthesis technology to synthesize CeVO 4 microsphere photocatalyst, however CeVO 4 The specific surface area of ​​microspheres is small, and the photocatalytic efficiency is low

Method used

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  • a cevo <sub>4</sub> /ag/g‑c <sub>3</sub> n <sub>4</sub> Composite photocatalyst and preparation method thereof
  • a cevo <sub>4</sub> /ag/g‑c <sub>3</sub> n <sub>4</sub> Composite photocatalyst and preparation method thereof
  • a cevo <sub>4</sub> /ag/g‑c <sub>3</sub> n <sub>4</sub> Composite photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] CeVO of this embodiment 4 / Ag / g-C 3 N 4 Composite photocatalyst, wherein x=0.05, the specific preparation steps are as follows:

[0036] a) Weigh 10.0000g melamine in a crucible, calcinate at 500°C for 4h (heating rate 5°C / min), wash with deionized water and absolute ethanol 2-3 times, dry and grind at 80°C to obtain g-C 3 N 4 powder.

[0037] b) Weigh 4.3427gCe(NO 3 ) 3 Dissolve in 20mL deionized water, weigh 3.7223g EDTA and dissolve in 5mL deionized water, place them on a magnetic stirrer and stir for 15min to obtain solutions A and B, mix and stir for 15min; weigh 1.1698gNH 4 VO 3 Dissolve in 20mL deionized water to obtain solution C, mix solution C with the above mixture, and stir on a magnetic stirrer for 45min, then transfer the mixed solution to a high-pressure reactor, heat to 200°C, and keep it warm for 24h; take it out and let it cool naturally, The resulting solution was centrifuged, washed 2–3 times with deionized water and absolute ethanol, and dri...

Embodiment 2

[0041] CeVO of this example 4 / Ag / g-C 3 N 4 Composite photocatalyst, wherein x=0.1, concrete preparation steps are as follows:

[0042] a) Weigh 10.0000g melamine in a crucible, calcinate at 520°C for 5h (heating rate 5°C / min), wash with deionized water and absolute ethanol 2-3 times, dry and grind at 80°C to obtain g-C 3 N 4 powder.

[0043] b) Weigh 4.3427gCe(NO 3 ) 3 Dissolve in 20mL deionized water, weigh 5.5836g EDTA and dissolve in 8mL deionized water, place them on a magnetic stirrer and stir for 15min to obtain solutions A and B, mix and stir for 15min; weigh 1.1698gNH 4 VO 3 Dissolve in 20mL deionized water to obtain solution C, mix solution C with the above mixed solution, and stir on a magnetic stirrer for 45min, then transfer the mixed solution to a high-pressure reactor, heat to 170°C, and keep it warm for 22h; take it out and let it cool naturally, The resulting solution was centrifuged, washed 2–3 times with deionized water and absolute ethanol, and drie...

Embodiment 3

[0046] CeVO of this example 4 / Ag / g-C 3 N 4 Composite photocatalyst, wherein x=0.25, concrete preparation steps are as follows:

[0047] a) Weigh 10.0000g melamine in a crucible, calcinate at 520°C for 4h (heating rate 5°C / min), wash with deionized water and absolute ethanol 2-3 times, dry and grind at 80°C to obtain g-C 3 N 4 powder.

[0048] b) Weigh 4.3427gCe(NO 3 ) 3 Dissolve in 20mL deionized water, weigh 3.7223g EDTA and dissolve in 5mL deionized water, place them on a magnetic stirrer and stir for 15min to obtain solutions A and B, mix and stir for 15min; weigh 1.1698gNH 4 VO 3 Dissolve in 20mL deionized water to obtain solution C, mix solution C with the above mixture, and stir on a magnetic stirrer for 45min, then transfer the mixed solution to a high-pressure reactor, heat to 180°C, and keep it warm for 23h; take it out and let it cool naturally, The resulting solution was centrifuged, washed 2–3 times with deionized water and absolute ethanol, and dried at 8...

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Abstract

The invention discloses a CeVO 4 / Ag / g‑C 3 N 4 Composite photocatalyst and preparation method thereof. The present invention prepares g-C through calcination 3 N 4 Powder and hydrothermal synthesis of CeVO 4 , change g‑C 3 N 4 , CeVO 4 , Ag mixed ultrasound to obtain CeVO 4 / Ag / g‑C 3 N 4 Composite photocatalyst. CVO 4 / Ag / g‑C 3 N 4 The band gap of the composite photocatalyst is between 2.10eV and 2.80eV, and increases with CeVO 4 Compared with CeVO4, which has a bandgap width of 2.90eV, the bandgap becomes narrower and the visible light range that can be responded to is broadened. CVO 4 / Ag / g‑C 3 N 4 Composite photocatalyst with graphite-like structure g‑C 3 N 4 For matrix composite tetragonal phase CeVO 4 and Ag to form a three-phase heterojunction structure, which can effectively separate photogenerated electron-hole pairs and improve g-C 3 N 4 The photocatalytic performance can effectively degrade organic dyes in sewage.

Description

technical field [0001] The invention belongs to the technical field of functional materials, relates to a photocatalyst, in particular to a CeVO 4 / Ag / g-C 3 N 4 Composite photocatalyst and preparation method thereof. Background technique [0002] Traditional semiconductor photocatalytic material TiO 2 , due to the wide forbidden band, only ultraviolet light with a wavelength below 387nm can be responded. In the solar spectrum, ultraviolet light only accounts for about 5% of solar energy, while visible light, which accounts for the vast majority, has not been effectively utilized, which limits its application in the actual production process. Therefore, it is imperative to develop photocatalysts with visible light response and high conversion efficiency to improve the utilization rate of solar energy and finally realize the industrial application of photocatalytic technology. [0003] Graphite carbon nitride (g-C 3 N 4 ) as an n-type semiconductor with good chemical st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24A62D3/17A62D101/20
CPCA62D3/17B01J23/10B01J23/22B01J23/50B01J27/24A62D2101/20B01J35/19
Inventor 汪浩然李莉王雄
Owner NANJING UNIV OF SCI & TECH