Preparation method of Co-BiOBr (cobalt-bismuth oxybromide)/TiO2 (titanium dioxide)/GO (graphene oxide) ternary composite photocatalyst

A photocatalyst and ternary recombination technology, applied in the field of photocatalysis, can solve problems such as hindering wide application, large band gap, and low solar energy utilization efficiency, and achieve good practicability, suppress charge recombination, solvothermal method and ultrasonic method Simple and convenient effect

Inactive Publication Date: 2017-07-07
HOHAI UNIV
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Problems solved by technology

However, TiO 2 Due to its large band gap (3.2eV), the utilization efficiency of solar energy is low, only about 5%, which hinders its wide application

Method used

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  • Preparation method of Co-BiOBr (cobalt-bismuth oxybromide)/TiO2 (titanium dioxide)/GO (graphene oxide) ternary composite photocatalyst
  • Preparation method of Co-BiOBr (cobalt-bismuth oxybromide)/TiO2 (titanium dioxide)/GO (graphene oxide) ternary composite photocatalyst

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preparation example Construction

[0028] A Co-BiOBr / TiO 2 The preparation method of / GO ternary composite photocatalyst comprises the following steps:

[0029] 1) Preparation of doped Co 2+ BiOBr photocatalyst (Co-BiOBr)

[0030] Weigh Bi(NO 3 ) 3` 5H 2 O and Co(NO 3 ) 2 ·6H 2 Dissolve O in a polar organic solvent, then add a corresponding amount of NaBr, stir to dissolve, add a surfactant, stir evenly and then oscillate ultrasonically, transfer the solution after ultrasonication to a polytetrafluoroethylene high-pressure reactor for the first heat preservation reaction Post-washing, filtering, and drying to obtain the Co-BiOBr photocatalyst;

[0031] 2) Preparation of Co-BiOBr / TiO 2 binary composite photocatalyst

[0032] According to the Bi:Ti molar ratio (0.25~0.75):1, weigh the Co-BiOBr photocatalyst with the optimal doping amount prepared in step 1) and the TiO prepared by solvothermal method 2 Put them into deionized water and ultrasonically oscillate respectively, then mix the two together and...

Embodiment 1

[0040] A kind of preparation method of Co-BiOBr photocatalyst, specifically as follows:

[0041] Weigh 2.4254gBi(NO 3 ) 3` 5H 2 O and 0.0073gCo(NO 3 ) 2 ·6H 2 O was dissolved in 35mL of ethylene glycol, then weighed 0.5145gNaBr and slowly added it to the above solution, stirred until it was completely dissolved, added 0.20gPVP to it, stirred evenly, ultrasonically oscillated for 30min, and then transferred the oscillated solution to In a 50mL polytetrafluoroethylene autoclave, react at 160°C for 6 hours, wash with deionized water three times to remove excess ions and other impurities in the precipitate, wash with absolute ethanol three times to remove residual organic matter, and place in Dry in an air-blast oven at 80°C for 6 hours to obtain a 0.5% atm Co-BiOBr photocatalyst.

Embodiment 2

[0043] A kind of preparation method of Co-BiOBr photocatalyst, specifically as follows:

[0044] Weigh 2.4254gBi(NO 3 ) 3` 5H 2 O and 0.0146gCo(NO 3 ) 2 ·6H 2 O was dissolved in 35mL of ethylene glycol, then weighed 0.5145g NaBr and slowly added it to the above solution, stirred until it was completely dissolved, added 0.20g of PVP to it, stirred evenly, ultrasonically oscillated for 35min, and then transferred the oscillated solution to In a 50mL polytetrafluoroethylene autoclave, react at 165°C for 7 hours, wash with deionized water three times to remove excess ions and other impurities in the precipitate, wash with absolute ethanol three times to remove residual organic matter, and place in Dry it in an air-blast oven at 80° C. for 6 hours to obtain a 1% atm Co-BiOBr photocatalyst.

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Abstract

The invention discloses a preparation method of a Co-BiOBr (cobalt-bismuth oxybromide) / TiO2 (titanium dioxide) / GO (graphene oxide) ternary composite photocatalyst, and belongs to the technical field of photocatalysis. The preparation method comprises the following steps of (1) preparing a BiOBr photocatalyst doped with Co<2+>; (2) preparing a Co-BiOBr / TiO2 binary composite photocatalyst; (3) preparing the Co-BiOBr / TiO2 / GO ternary composite photocatalyst. The preparation method has the advantages that by doping the Co<2+> and compounding with the TiO2 to form a heterojunction, the photo-induced electron can be quickly moved through the good conductivity of GO, and the charge compounding is inhibited; by utilizing the larger specific surface area of GO, the adsorbing ability of the photocatalyst is improved, and a dye is favorably degraded; the degrading rate on Rhodamine B can reach 96.8% within 20min by the prepared modified Co-BiOBr / TiO2 / GO ternary composite photocatalyst; the improved solvent thermal method and ultrasonic method are simpler and more convenient, and the reaction condition is milder; compared with the method of depositing noble metal on the BiOBr surface, the obtaining of the raw materials in the preparation method is simple, the cost is lower, the preparation method is suitable for the treatment of large-scale printing-dyeing wastewater, and the practicality is good.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a Co-BiOBr / TiO 2 / GO ternary composite photocatalyst preparation method. Background technique [0002] With the rapid development of industry, the problems of environmental pollution and energy shortage are becoming increasingly prominent. Photocatalytic technology is an advanced oxidation technology that effectively utilizes solar energy and solves water pollution, and has attracted more and more attention in recent years. As we all know, printing and dyeing wastewater is a kind of wastewater that is difficult to treat, and photocatalytic technology has its unique advantages in treating printing and dyeing wastewater. [0003] BiOBr is a new type of semiconductor material. Its crystal layered structure can polarize atoms and atomic orbitals, and separate photogenerated electrons and holes, thereby improving the photocatalytic effect; however, photogenerated electrons ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135C02F1/30C02F1/72
CPCY02W10/37B01J27/135B01J35/004C02F1/30C02F1/725C02F2305/10
Inventor 孙红伟闫振华陆光华江润仁沈杰周冉冉
Owner HOHAI UNIV
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