A kind of preparation method of go/sb-biobr composite photocatalyst

A technology of photocatalyst and composite light, applied in chemical instruments and methods, light water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of reducing the probability of recombination of electrons and holes, located in the ultraviolet region, and solar energy utilization Low efficiency and other problems, to achieve the effect of favorable degradation, easy availability of raw materials, and low cost

Inactive Publication Date: 2018-02-06
HOHAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The earliest photocatalyst discovered by humans is TiO 2 , but its bandgap energy is about 3.2eV, which leads to its absorption edge in the ultraviolet region
However, ultraviolet light only accounts for about 4% of the entire solar spectrum, so TiO 2 The utilization rate of solar energy is very low, and now it is becoming the focus of human research to find new high-efficiency photocatalysts that can respond to visible light
[0003] BiOX (X=Cl, Br, I) is a new type of PbFCl tetragonal semiconductor material. The layered structure of bismuth oxyhalide crystals has enough space to polarize atoms and atomic orbitals, so that photogenerated electrons and space can be polarized. However, the photogenerated electrons excited by BiOCl, BiOBr, and BiOI indirect bandgap semiconductors must pass through some k-layers to reach the valence band position, which greatly reduces the electron and photocatalytic effect. recombination probability of holes

Method used

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  • A kind of preparation method of go/sb-biobr composite photocatalyst
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  • A kind of preparation method of go/sb-biobr composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0028] A kind of preparation method of GO / Sb-BiOBr composite photocatalyst, concrete steps are as follows:

[0029] (1) Preparation of Sb-BiOBr photocatalyst

[0030] Weigh 2.4254gBi(NO 3 ) 3` 5H 2 O and 0.0114gSbCl 3 Dissolve in 30mL of ethylene glycol, then weigh 0.5145g NaBr and slowly add it to the above solution, ultrasonically oscillate for 10min, then add 0.20g of polyvinylpyrrolidone and 0.0020g of mannitol, stir well, then ultrasonically oscillate for 30min again, Then transfer the shaken solution to a 50mL polytetrafluoroethylene autoclave, react at 150°C for 6h, wash with deionized water several times to remove excess ions and other impurities in the precipitate, and wash with absolute ethanol several times In order to remove excess organic matter, after washing, it was placed in a blast drying oven at 70° C. for 8 hours to obtain a 1% atm Sb-BiOBr photocatalyst.

[0031] (2) Preparation of GO (graphene oxide)

[0032] Prepare GO by airtight oxidation method, ...

Embodiment 2

[0036] A preparation method of a GO / Sb-BiOBr composite photocatalyst, the specific steps are as follows:

[0037] (1) Weigh 2.4254gBi (NO 3 ) 3` 5H 2 O and 0.0342gSbCl 3 Dissolve in 30mL of ethylene glycol, then weigh 0.5145g of NaBr and slowly add it to the above solution, ultrasonically vibrate for 10min and then add 0.20g of polyvinylpyrrolidone and 0.0020g of mannitol to it, stir evenly and then ultrasonically vibrate again for 30min. Then transfer the shaken solution to a 50mL polytetrafluoroethylene autoclave, react at 150°C for 6 hours, wash with deionized water for several times to remove excess ions and other impurities in the precipitate, and wash with absolute ethanol for several times In order to remove excess organic matter, after washing, it was placed in a blast drying oven at 70° C. for drying for 8 h to obtain a 3% atm Sb-BiOBr photocatalyst.

[0038] (2) step (2) with embodiment 1;

[0039] (3) According to the mass ratio of Sb-BiOBr to GO of 100:0.5, we...

Embodiment 3

[0041] A preparation method of a GO / Sb-BiOBr composite photocatalyst, the specific steps are as follows:

[0042] (1) Weigh 2.4254gBi (NO 3 ) 3` 5H 2 O and 0.0570gSbCl 3 Dissolve in 30mL of ethylene glycol, then weigh 0.5145g of NaBr and slowly add it to the above solution, ultrasonically vibrate for 10min and then add 0.20g of polyvinylpyrrolidone and 0.0020g of mannitol to it, stir evenly and then ultrasonically vibrate again for 30min. Then transfer the shaken solution to a 50mL polytetrafluoroethylene autoclave, react at 150°C for 6 hours, wash with deionized water for several times to remove excess ions and other impurities in the precipitate, and wash with absolute ethanol for several times In order to remove excess organic matter, after washing, it was placed in a blast drying oven at 70° C. to dry for 8 h to obtain a 5% atm Sb-BiOBr photocatalyst.

[0043] (2) step (2) with embodiment 1;

[0044] (3) According to the mass ratio of Sb-BiOBr to GO of 100:0.5, weigh ...

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Abstract

The invention discloses a preparation method of GO / Sb-BiOBr composite photocatalyst, comprising the following steps: 1) preparing Sb-BiOBr photocatalyst; 2) preparing GO / Sb-BiOBr composite photocatalyst: weighing Sb-BiOBr photocatalyst and the GO prepared by the airtight oxidation method were put into deionized water respectively, ultrasonically oscillated respectively, and then the two were mixed and ultrasonically oscillated again, washed, filtered, and dried to obtain the GO / Sb‑BiOBr composite photocatalyst precursor, and then the precursor The body was put into a muffle furnace for the second heat preservation and calcined to obtain a GO / Sb-BiOBr composite photocatalyst; a combination of solvothermal method and ultrasonic precipitation method was used to realize the doping of Sb3+ and the recombination with GO. The GO / Sb-BiOBr composite photocatalyst prepared by doping Sb3+ and further loading GO in the present invention not only has a narrow band gap, but also the good electrical conductivity of GO can make photogenerated electrons move quickly and inhibit charge recombination; at the same time, GO The larger specific surface area can increase the adsorption capacity of the photocatalyst, which is more conducive to the degradation of dyes; it can be used for large-scale sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a preparation method of a GO / Sb-BiOBr composite photocatalyst. Background technique [0002] In recent years, with the rapid development of the economy, the problems of environmental pollution and energy shortage have become increasingly prominent. Photocatalytic technology provides us with a way to effectively treat pollutants in water and utilize solar energy efficiently. The earliest photocatalyst discovered by humans is TiO 2 , but its bandgap energy is about 3.2eV, which leads to its absorption edge in the ultraviolet region. However, ultraviolet light only accounts for about 4% of the entire solar spectrum, so TiO 2 The utilization rate of solar energy is very low, and now it is becoming the focus of human research to find new high-efficiency photocatalysts that can respond to visible light. [0003] BiOX (X=Cl, Br, I) is a new type of PbFCl tetragona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/38
CPCY02W10/37
Inventor 孙红伟闫振华陆光华覃冬荭潘婷但孝香
Owner HOHAI UNIV
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