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A light reduction co 2 Composite photocatalyst with ultra-thin Ti-based LDHS and its preparation method

A CO2 and catalyst technology, applied in the field of visible light response photocatalyst preparation, can solve the problems of large size, small specific surface area, low catalytic activity of photocatalytic reduction, etc., and achieve the effect of high activity and stability

Active Publication Date: 2021-02-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that although the hydrotalcite material is in the photocatalytic reduction of CO 2 It has a wide range of applications in the reaction, but Ti-based materials are the most widely used catalysts in photocatalytic reactions. There are few reports on the design of Ti-based LDHs photocatalysts by introducing Ti elements into LDHs laminates, and most of the reported LDHs-based photocatalysts have a size Larger, smaller specific surface area, and narrow light absorption range, making it photocatalytically reduce CO 2 The catalytic activity is very low

Method used

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  • A light reduction co <sub>2</sub> Composite photocatalyst with ultra-thin Ti-based LDHS and its preparation method
  • A light reduction co <sub>2</sub> Composite photocatalyst with ultra-thin Ti-based LDHS and its preparation method
  • A light reduction co <sub>2</sub> Composite photocatalyst with ultra-thin Ti-based LDHS and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A. Measure 569 μL TiCl 4 (TiCl 4 Dissolved in concentrated HCl with a volume ratio of 1:1), weigh 0.009mol of Mg(NO 3 ) 2 ·6H 2 O, 0.006mol of Al (NO 3 ) 3 ·9H 2 O, add 150mL to remove CO 2 Dissolved in deionized water, configure mixed salt solution A; weigh 0.036mol of NaOH, add 150mL to remove CO 2 Dissolve the deionized water in the solution, configure alkaline solution B, drop solution A into the 500mL reactor at a speed of 1-10mL / min, control the dropping speed of solution B at the same time, adjust the pH of the whole system = 9-11, to be added dropwise After the end, the reaction was carried out at 80°C for 16h (the whole reaction process was 2 Completed under the protection of atmosphere), centrifuged to pH=7 of the supernatant after the reaction, and fully dried in an oven at 60 °C to obtain TiMgAl-NO 3 - -LDHs;

[0029] B. Weigh 0.2500g TiMgAl-NO of step A 3 - -LDHs was placed in a flask, 250 mL of formamide was added, and stirred for 48 h under a...

Embodiment 2

[0034] A. with embodiment 1;

[0035] B. Weigh 0.2500g TiMgAl-NO of step A 3 - -LDHs was placed in a flask, 250 mL of N,N-dimethylformamide was added, and stirred for 48 h under a nitrogen atmosphere to obtain a transparent and stable colloidal solution, expressed as U-TiMgAl-LDHs;

[0036] C. Weigh 0.0250g of C 3 N 4 Add 100 mL of an aqueous solution of sodium dodecyl sulfate with a concentration of 0.25 g / L, and ultrasonically disperse for 30 min to obtain uniformly dispersed C 3 N 4 slurry;

[0037] D. The C obtained from the C step 3 N 4 The slurry was added dropwise to the U-TiMgAl-LDHs colloidal solution in step B at a rate of 2 mL / min. After the dropwise addition was completed, stirring was continued for 30 min, alternately washed with deionized water and ethanol for several times, and vacuum dried at 60 °C to obtain U-TiMgAl-LDHs. TiMgAl-LDH / C 3 N 4 composite catalyst.

[0038] E. U-TiMgAl-LDH / C obtained by step D 3 N 4 Composite catalysts for photocatalyt...

Embodiment 3

[0040] A. Measure 569 μL TiCl 4 (TiCl 4 Dissolved in concentrated HCl with a volume ratio of 1:1), weigh 0.009mol of Zn(NO 3 ) 2 ·6H 2 O, 0.006mol of Al (NO 3 ) 3 ·9H 2 O, add 150mL to remove CO 2 Dissolved in deionized water, configure mixed salt solution A; weigh 0.036mol of NaOH, add 150mL to remove CO 2 Dissolve the deionized water in the solution, configure alkaline solution B, drop solution A into the 500mL reactor at a speed of 1-10mL / min, control the dropping speed of solution B at the same time, adjust the pH of the whole system = 9-11, to be added dropwise After the end, the reaction was carried out at 80°C for 16h (the whole reaction process was 2 Completed under the protection of atmosphere), centrifuged to pH=7 of the supernatant after the reaction, and fully dried in a 60°C oven to obtain TiZnAl-NO 3 - -LDHs;

[0041] B. Weigh 0.2500g TiZnAl-NO of step A 3 --LDHs in the flask, add 250mL formamide, stir for 48h under nitrogen atmosphere, get a transpa...

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Abstract

The invention provides a photocatalytic reduction of CO 2 Composite photocatalyst with ultra-thin Ti-based LDHs and its preparation method. In the invention, the photoactive Ti element is introduced into the LDHs laminate, and the ultra-thin Ti-based LDHs nanochip with highly dispersed active component Ti and enhanced accessibility is obtained by peeling off the layer, and compounded with a carrier with special properties to realize the catalyst response in the visible range. The catalyst is denoted as U‑TiM 1 m 2 ‑LDHs / S, where U‑TiM 1 m 2 ‑LDHs is an ultra-thin Ti-based LDHs nanochip with an average thickness of 1‑2nm, and S is a carrier with visible light absorption capacity. The catalyst has the ability to respond to visible light and can be used in the photocatalytic reduction of CO 2 The system has high activity and stability. Photocatalytic reduction of CO by the composite catalyst under visible light excitation 2 The system shows excellent catalytic activity, and its catalytic performance is close to that of supported noble metal catalysts, which provides a new way for the preparation of low-cost and high-efficiency photocatalysts.

Description

technical field [0001] The invention relates to the field of visible light-responsive photocatalyst preparation, in particular to photocatalytic reduction of CO under visible light 2 Ultrathin Ti-based LDHs composite catalyst and preparation method thereof. Background technique [0002] With the continuous development of society, energy shortage and environmental pollution have gradually attracted people's attention. On the one hand, about 80% of the global energy supply comes from non-renewable energy sources such as fossil fuels, and people's extensive use of energy has led to increasingly poor energy. On the other hand, the burning of fossil fuels causes serious environmental problems such as environmental pollution and greenhouse effect. Therefore, the development and utilization of new energy sources and the prevention and control of environmental pollution are of great significance to the sustainable development of mankind. Photocatalytic technology has the advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/25B01J37/34B01D53/86B01D53/62B82Y30/00B82Y40/00C07C1/02C07C9/04C01B32/40
CPCB01D53/8671B01D2257/504B01J27/25B01J35/004B01J37/343B82Y30/00B82Y40/00C07C1/02C01B32/40C07C9/04
Inventor 冯俊婷王凯旋李殿卿贺宇飞
Owner BEIJING UNIV OF CHEM TECH
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