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Preparation method and application of copper-doped CQD (carbon quantum dot)/bismuth tungstate composite photocatalyst

A carbon quantum dot and copper doping technology, applied in the chemical industry, can solve the problems of less research and less research on the photocatalytic performance of carbon quantum dots, and achieve improved degradation rate, good catalytic activity and stability, and electron transfer ability enhanced effect

Active Publication Date: 2018-11-13
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current research on carbon quantum dots focuses on the light emission performance of carbon quantum dots, and there are few studies on the photocatalytic performance of carbon quantum dots. Carbon quantum dots strengthen TiO 2 The resear

Method used

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  • Preparation method and application of copper-doped CQD (carbon quantum dot)/bismuth tungstate composite photocatalyst
  • Preparation method and application of copper-doped CQD (carbon quantum dot)/bismuth tungstate composite photocatalyst

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Effect test

Embodiment 1

[0021] Embodiment 1: The preparation method and application of this copper-doped carbon quantum dot / bismuth tungstate composite photocatalyst are as follows:

[0022] (1) Take 1.6gNa 2 [Cu(EDTA)] and 0.3 g ascorbic acid, mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300 °C for 2 h, after the roasting was completed, the black product was ground and dissolved in 100 mL of deionized water, and ultrasonicated for 20 min; then the black suspension was centrifuged at 15,000 rpm for 15 min, and the supernatant was passed through a 0.22 μm filter membrane; the filtrate was dried in a vacuum oven at 60 °C for 24 h to obtain copper-doped carbon quantum dots;

[0023] (2) Weigh 7.6g Bi (NO 3 ) 3 ·5H 2 O and 1.0g copper-doped carbon quantum dots were added to 40mL deionized water, stirred and dissolved; then 0.8mmol L -1 Add 5 mL of phosphotungstic acid hydrate to the above solution, and mix ultrasonically for 20 min; after agin...

Embodiment 2

[0027] Embodiment 2: The preparation method and application of this copper-doped carbon quantum dot / bismuth tungstate composite photocatalyst are as follows:

[0028] (1) Take 2.0g Na 2 [Cu(EDTA)] and 0.2g ascorbic acid, mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300°C for 2h, after the roasting was completed, the black product was ground and dissolved in 100 mL of deionized water, and sonicated for 25 min; then the black suspension was centrifuged at 12,000 rpm for 18 min, and the supernatant was passed through a 0.22 μm filter membrane. The filtrate was taken and dried in a vacuum oven at 65 °C for 24 h to obtain copper-doped carbon quantum dots;

[0029] (2) Weigh 8.0g Bi (NO 3 ) 3 ·5H 2 O and 0.5g copper-doped carbon quantum dots were added to 50mL deionized water, stirred and dissolved; then 0.85mmol L -1 Add 5 mL of phosphotungstic acid hydrate to the above solution, and mix ultrasonically for 25 minutes; af...

Embodiment 3

[0032] Embodiment 3: The preparation method and application of this copper-doped carbon quantum dot / bismuth tungstate composite photocatalyst are as follows:

[0033] (1) Take: 1.8g Na 2 [Cu(EDTA)] and 0.1g ascorbic acid were mixed evenly, placed in a corundum boat with a lid, and roasted in a high-temperature tube furnace at 300°C for 2.5h. After the roasting was completed, the black product was ground and dissolved in 100 mL to Then, the black suspension was centrifuged at 10,000 rpm for 20 min, and the supernatant was passed through a 0.22 μm filter membrane; the filtrate was dried in a vacuum oven at 60 °C for 24 h to obtain copper-doped carbon quantum dots;

[0034] (2) Weigh 7.8g Bi (NO 3 ) 3 ·5H 2 O and 0.8g copper-doped carbon quantum dots were added to 45mL deionized water, stirred and dissolved; then 0.9mmol L -1 Add 5 mL of phosphotungstic acid hydrate to the above solution, and mix ultrasonically for 30 minutes; after aging the solution for 2.5 hours at room t...

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Abstract

The invention discloses a preparation method and an application of a copper-doped CQD (carbon quantum dot)/bismuth tungstate composite photocatalyst. The preparation method comprises the following steps: (1) preparation of copper-doped CQDs; (2) preparation of the copper-doped CQD/bismuth tungstate composite system. Photocatalytic performance of the prepared composite is tested by visible light, and superior photocatalytic performance of the material is proved by degradation of antibiotic ceftiofur sodium; the composite photocatalyst has good catalytic activity and stability, because electrontransfer in the photocatalytic process is enhanced by the copper-doped CQDs, capacity of an electron acceptor and an electron donor is improved, and the copper-doped CQDs act heterogeneously and synergistically with bismuth tungstate; after irradiation with visible light for 30 min, the degradation rate of ceftiofur sodium by the composite photocatalyst is remarkably increased as compared with thedegradation rate of the single copper-doped CQD and single bismuth tungstate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of a copper-doped carbon quantum dot / bismuth tungstate composite photocatalyst and a method for degrading ceftiofur sodium. Background technique [0002] Bismuth tungstate (Bi 2 WO 6 ) Bi 6 s orbital and O 2 P orbital hybridization forms the valence band, W 5d The track forms a conduction band, so its forbidden band width is narrow (about 2.7eV), it can be excited by absorbing visible light, and can degrade pollutants under visible light, but its low photogenerated carrier separation efficiency makes it photocatalytically active Low. Carbon quantum dots (CQDs) nanomaterials have the characteristics of broad absorption spectrum and high absorption coefficient, non-toxic, stable chemical properties, abundant raw materials, simple preparation methods, etc., and their good electrical conductivity is conducive to charge transport. Howe...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/00C02F1/30C02F101/30
CPCB01J23/002B01J23/31B01J35/004C02F1/30C02F2101/305
Inventor 杨亚玲杨德志
Owner KUNMING UNIV OF SCI & TECH
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