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Composite photocatalytic system cqd s -knbo 3 And its preparation method and application

A composite photocatalysis and photocatalysis technology, applied in the field of photocatalysis, can solve the problems of large band gap, low light utilization efficiency, and low utilization efficiency of photogenerated carriers, and achieve strong redox effect

Active Publication Date: 2019-12-06
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, KNbO 3 As a photocatalytic degradation material for hydrogen production, it has certain disadvantages
KbO 3 It has a wide bandgap (3.3eV) and a large forbidden band width, which cannot effectively use the visible light part of sunlight, and the light utilization rate is low
Also, KNbO 3 The probability of recombination of holes and photogenerated electrons is relatively high, which makes the utilization efficiency of photogenerated carriers low

Method used

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  • Composite photocatalytic system cqd <sub>s</sub> -knbo <sub>3</sub> And its preparation method and application
  • Composite photocatalytic system cqd <sub>s</sub> -knbo <sub>3</sub> And its preparation method and application
  • Composite photocatalytic system cqd <sub>s</sub> -knbo <sub>3</sub> And its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 Composite photocatalytic system CQD S -KNbO 3

[0014] 1. KNbO 3 Preparation of particles:

[0015] Preparation of KNbO by hydrothermal method 3 Particles. 3.57g Nb 2 O 5 Add the powder and 37.69g KOH flake solid to a beaker containing 19ml deionized water, stir on a magnetic stirrer for 30 minutes, until Nb 2 O 5 Mix well with KOH, and all dissolve. Then the mixture was sealed in a polytetrafluoroethylene lined stainless steel autoclave and heated at 160°C for 12 hours. Cool to room temperature. The product was ground to a granular shape, and then calcined in a muffle furnace. The calcining temperature was 400° C., and the calcining time was 1 h. Cool to room temperature and grind to obtain KNbO 3 Particles.

[0016] 2. Preparation of carbon quantum dots CQDs:

[0017] Preparation of CQD by hydrothermal method S . 1.6 g of ascorbic acid, 15 ml of ethylene glycol and 25 ml of deionized water were added to the beaker and stirred on a magnetic stirrer for 30 minute...

Embodiment 2

[0020] Example 2 Composite photocatalytic system CQD S -KNbO 3 Visible light catalytic degradation of crystal violet

[0021] (1) The effect of light time on the photocatalytic degradation of crystal violet

[0022] Visible light catalytic degradation: Take 50.0 mL of 10.0 mg / L crystal violet solution in a 100 mL conical flask, and add the CQD prepared in Example 1 S -KNbO 3 50.0mg, irradiated under visible light for 1.0~5.0h. Filter and measure its UV spectrum at 200-800nm. Take the absorbance at 582nm to calculate the degradation rate of crystal violet.

[0023] Degradation rate (%) = (C 0 –C) / C 0 ×100% (where C 0 : Concentration of stock solution; C: Concentration of sample). The results are shown in Table 1.

[0024] Table 1 Composite photocatalytic system CQD S -KNbO 3 Visible light photocatalytic degradation of crystal violet

[0025]

[0026] As shown in Table 1, with the prolongation of the light time, the degradation rate of the catalyst C / K 0, C / K 0.5, C / K 1.0, C / K 1.5 to ...

Embodiment 3

[0032] Example 3 Composite photocatalytic system CQD S -KNbO 3 Photocatalytic hydrogen production with crystal violet as sacrificial agent

[0033] (1) The effect of light time on the photocatalytic hydrogen production with crystal violet as a sacrificial agent

[0034] Method: Measure 500 mL of 50.0 mg / L crystal violet solution into a photocatalytic hydrogen production reactor, add 200.0 mg of the catalyst prepared in Example 1, and irradiate it under visible light for 1.0 to 5.0 hours. Gas chromatography was used to measure the amount of hydrogen produced in the reaction. The results are shown in Table 3.

[0035] Table 3 Composite system CQD S -KNbO 3 Visible light photocatalytic hydrogen production

[0036]

[0037] As shown in Table 3, with the prolongation of the illumination time, the hydrogen production of the catalysts C / K 0, C / K 0.5, C / K 1.0, and C / K 1.5 all increased with the increase of the concentration of CQDs. When the C / K is 1.5 and the light time is 5.0h, the amount...

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Abstract

The invention relates to a composite photocatalytic system CQD S ‑KNbO 3 and preparation methods and applications thereof. The preparation method includes the following steps: carbon quantum dots CQD S Dissolve in deionized water, then KNbO 3 Added to Carbon Quantum Dots CQD S In the aqueous solution, stir for 1 hour and dry at 80°C to obtain the composite photocatalytic system CQD S ‑KNbO 3 . Composite photocatalytic system CQD with strong redox activity provided by the invention S ‑KNbO 3 , can achieve the simultaneous production of hydrogen while degrading organic pollutants under visible light irradiation, treating pollutants as a resource, achieving the dual purpose of environmental governance and generating clean energy.

Description

Technical field [0001] The invention belongs to the field of photocatalysis, and specifically relates to a composite photocatalytic system CQD S -KNbO 3 Preparation and application of photocatalytic degradation of organic pollutants and simultaneous hydrogen production under visible light irradiation. Background technique [0002] Environmental pollution has evolved into a serious problem that mankind must face in the process of social development. In the dye industry, some azo dyes are produced. Because of their stable structure, high toxicity, and electron-withdrawing groups, they are difficult to degrade. This kind of refractory pollutants will exist in the environment for a long time and have great harm to the ecological environment and human health. However, it is also a waste of resources to degrade these refractory pollutants alone without using them. Therefore, an economical and reasonable method should be proposed to solve this problem. In fact, refractory pollutants ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20C01B3/02C02F1/30C02F101/38
CPCC01B3/02C02F1/30B01J23/20C02F2101/38B01J35/39Y02P20/10
Inventor 张朝红屈泽鹏刘逸伦纪剑峰王君宋有涛孙意忱
Owner LIAONING UNIVERSITY
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