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Ultrathin Ti-based LDHs composite photocatalyst for photoreduction of CO2 and preparation method thereof

A CO2, catalyst technology, applied in the field of visible light-responsive photocatalyst preparation, can solve the problems of large size, narrow light absorption range, small specific surface area, etc., and achieve the effect of high activity and stability

Active Publication Date: 2018-09-21
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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  • Ultrathin Ti-based LDHs composite photocatalyst for photoreduction of CO2 and preparation method thereof
  • Ultrathin Ti-based LDHs composite photocatalyst for photoreduction of CO2 and preparation method thereof
  • Ultrathin Ti-based LDHs composite photocatalyst for photoreduction of CO2 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A. Measure 569μL TiCl 4 (TiCl 4 dissolved in concentrated HCl with a volume ratio of 1:1), weighed 0.009 mol of Mg(NO 3 ) 2 ·6H 2 O, 0.006mol of Al(NO 3 ) 3 9H 2 O, add 150mL to remove CO 2 Dissolve in deionized water, configure mixed salt solution A; weigh 0.036mol of NaOH, add 150mL to remove CO 2 Dissolve in deionized water, configure alkaline solution B, add solution A dropwise to a 500mL reactor at a rate of 1-10mL / min, and control the drop rate of solution B at the same time, adjust the pH of the entire system to 9-11, and wait for the dropwise addition After finishing, react 16h at 80 ℃ (whole reaction process is under N 2 under the protection of the atmosphere), after the reaction, centrifuge the supernatant to pH = 7, and fully dry it in an oven at 60°C to obtain TiMgAl-NO 3 - - LDHs;

[0029] B. Weigh 0.2500g of TiMgAl-NO from step A 3 - -LDHs in the flask, add 250mL formamide, stir for 48h under nitrogen atmosphere, get a transparent and stable c...

Embodiment 2

[0034] A. with embodiment 1;

[0035] B. Weigh 0.2500g of TiMgAl-NO from step A 3 - -LDHs into the flask, add 250mL N,N-dimethylformamide, stir for 48h under 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 100mL of 0.25g / L sodium lauryl sulfate aqueous solution, and ultrasonically disperse for 30min to obtain evenly dispersed C 3 N 4 slurry;

[0037] D. The C obtained in step C 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 and continued to stir for 30 min, it was alternately washed with deionized water and ethanol several times, and dried in vacuum at 60°C to obtain U- TiMgAl-LDH / C 3 N 4 Composite catalyst.

[0038] E. U-TiMgAl-LDH / C obtained in step D 3 N 4 Composite catalyst for photocatalytic reduction of CO under visible light 2 Reacting. The reaction conditio...

Embodiment 3

[0040] A. Measure 569μL TiCl 4 (TiCl 4 dissolved in concentrated HCl with a volume ratio of 1:1), weighed 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 Dissolve in deionized water, configure mixed salt solution A; weigh 0.036mol of NaOH, add 150mL to remove CO 2 Dissolve in deionized water, configure alkaline solution B, add solution A dropwise to a 500mL reactor at a rate of 1-10mL / min, and control the drop rate of solution B at the same time, adjust the pH of the entire system to 9-11, and wait for the dropwise addition After finishing, react 16h at 80 ℃ (whole reaction process is under N 2 under the protection of the atmosphere), after the reaction, centrifuge the supernatant to pH = 7, and fully dry it in an oven at 60°C to obtain TiZnAl-NO 3 - - LDHs;

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

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Abstract

The invention provides an ultrathin Ti-based LDHs composite photocatalyst for photoreduction of CO2 and a preparation method thereof. The method in the invention comprises the following steps: introducing Ti element with photoactivity into an LDHs laminate, peeling to obtain an ultrathin Ti-based LDHs nano-chip of which the active ingredient Ti is highly dispersed and the accessibility is enhanced, and compounding with a carrier with special property, thereby realizing response of the catalyst in a visible range. The catalyst is represented as U-TiM1M2 / LDHs / S, wherein U-TiM1M2 / LDHs is the ultrathin Ti-based LDHs nano-chip and has an average thickness of 1-2nm, and S is a carrier with visible light absorption ability. The catalyst has visible light responsiveness, and has high activity andstability in a photocatalytic reduction CO2 system. The composite catalyst has excellent catalytic activity in the photocatalytic reduction CO2 system under visible light excitation, has catalytic performance close to that of a supported noble metal catalyst, and provides a novel pathway for preparation of low-cost high-efficiency photocatalysts.

Description

technical field [0001] The invention relates to the field of preparation of visible light-responsive photocatalysts, in particular to photocatalytic reduction of CO under visible light 2 Ultrathin Ti-based LDHs composite catalyst and its preparation method. 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. People's extensive use of energy has led to energy shortages. On the other hand, the combustion of fossil fuels has caused serious environmental problems such as environmental pollution and the 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 human beings. Photocatalytic technology has the advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25B01J37/34B01D53/86B01D53/62B82Y30/00B82Y40/00C07C1/02C07C9/04C01B32/40
CPCB01D53/8671B82Y30/00B82Y40/00C01B32/40C07C1/02B01J27/25B01J37/343B01D2257/504B01J35/39C07C9/04
Inventor 冯俊婷王凯旋李殿卿贺宇飞
Owner BEIJING UNIV OF CHEM TECH
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