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Rare earth-doped NaYF4/Au@CdS composite photocatalyst and preparation method thereof

A rare earth doping, composite light technology, applied in the field of photocatalysis, to achieve the effect of excellent catalytic performance

Inactive Publication Date: 2017-01-04
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, only this three-component composite of upconversion matrix / semiconductor / plasmon resonance structure has been reported.

Method used

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  • Rare earth-doped NaYF4/Au@CdS composite photocatalyst and preparation method thereof
  • Rare earth-doped NaYF4/Au@CdS composite photocatalyst and preparation method thereof
  • Rare earth-doped NaYF4/Au@CdS composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] NaYF 4 :Yb 3+ / Er 3+ / Au@CdS composite photocatalyst preparation:

[0030] (1) Preparation of NaYF 4 :Yb 3+ / Er 3+ Microspheres:

[0031] At a temperature of 60°C and a stirring speed of 300r / min, 1.408mmol Y(NO 3 ) 3 •6H 2 O,0.16mmol Yb(NO 3 ) 3 • 5H 2 O, 0.032mmol Er(NO 3 ) 3 • 5H 2 O was dissolved in 20mL water; 1.6mmol EDTA was dissolved in 20mL water; 14.4mmol NaF was dissolved in 20mL water, and the above rare earth nitrate solution, surfactant and fluorine source solution were mixed and stirred for 1h to form a reaction precursor solution; The obtained precursor solution was transferred into a sealed 100mL polytetrafluoroethylene-lined reaction kettle, heated to 180°C, and kept for 3h; cooled to room temperature, washed with deionized water and absolute ethanol three times, and centrifuged to collect the precipitate. NaYF can be obtained by vacuum drying at 60°C 4 :Yb 3+ / Er 3+ microspheres;

[0032] (2) Preparation of NaYF 4 :Yb 3+ / Er 3+ ...

Embodiment 2

[0040] NaYF 4 :Yb 3+ / Er 3+ / Au@CdS composite photocatalyst preparation:

[0041] (1) Preparation of NaYF 4 :Yb 3+ / Er 3+ Microspheres:

[0042] At a temperature of 50°C and a stirring speed of 100r / min, 1.408mmol Y(NO 3 ) 3 •6H 2 O,0.28mmol Yb(NO 3 ) 3 • 5H 2 O, 0.141mmol Er(NO 3 ) 3 • 5H 2 O was dissolved in 20mL water; 1.4mmol sodium citrate was dissolved in 20mL water; 20mmol NaF was dissolved in 20mL water, and the above rare earth nitrate solution, surfactant and fluorine source solution were mixed and stirred for 1h to form a reaction precursor solution; Transfer the obtained precursor solution into a sealed 100mL polytetrafluoroethylene-lined reaction kettle, raise the temperature to 160°C, and keep it warm for 2h; cool to room temperature, wash with deionized water and absolute ethanol three times respectively, and centrifuge to collect the precipitate , NaYF was obtained by vacuum drying at 60°C 4 :Yb 3+ / Er 3+ microspheres;

[0043] (2) Preparati...

Embodiment 3

[0050] NaYF 4 :Yb 3+ / Er 3+ / Au@CdS composite photocatalyst preparation:

[0051] (1) Preparation of NaYF 4 :Yb 3+ / Er 3+ Microspheres:

[0052] At a temperature of 70°C and a stirring speed of 500r / min, 1.408mmol Y(NO 3 ) 3 •6H 2 O,0.08mmol Yb(NO 3 ) 3 • 5H 2 O, 0.0141mmol Er(NO 3 ) 3 • 5H 2 O was dissolved in 20mL water; 1.5mmol EDTA was dissolved in 20mL water; 6mmol NaF was dissolved in 20mL water, the above rare earth nitrate solution, surfactant solution and fluorine source solution were mixed and stirred for 1h to form a reaction precursor solution; The obtained precursor solution was transferred into a sealed 100mL polytetrafluoroethylene-lined reaction kettle, heated to 170°C, and kept for 6h; cooled to room temperature, washed three times with deionized water and absolute ethanol, and centrifuged to collect the precipitate. NaYF can be obtained by vacuum drying at 60°C 4 :Yb 3+ / Er 3+ microspheres;

[0053] (2) Preparation of NaYF 4 :Yb 3+ / Er ...

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Abstract

The invention discloses a rare earth-doped NaYF4 / Au@CdS composite photocatalyst and a preparation method thereof. Rare earth-doped NaYF4 serves as a core, CdS nano-crystal serves as a shell and an Au nanoparticle is inlaid in the core-shell interface position, wherein the molar weight ratio of the CdS to the rare earth-doped NaYF4 is (1:50)-(50:1); and the mass percentage of Au is 0.1%-10%. The NaYF4 / Au@CdS composite photocatalyst absorbs infrared light by utilizing an up-conversion material to convert and emit visible light, and induces a near-field electromagnetic field by initiating plasma resonance of an Au nano-structure to efficiently excite CdS so as to respond to near-infrared light. Therefore, in a photocatalytic ethanol reforming hydrogen production reaction, the composite photocatalyst optimizes the utilization efficiency of near-infrared light and improves the utilization efficiency of sunlight in the photocatalytic reaction.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a rare earth-doped NaYF 4 / Au@CdS composite photocatalyst and its preparation method. Background technique [0002] Hydrogen is a clean and efficient energy source that can potentially replace traditional fossil fuels. Using mild photocatalytic technology to catalyze hydrogen production from renewable resources is an effective means to meet environmental and energy needs in sustainable development. As a typical renewable biomass resource, bioethanol (ethanol concentration is about 12wt%) is mainly produced by microbial fermentation from woody materials, crop straw, and organic fractions of municipal solid waste. At present, the utilization of bio-ethanol often requires the process of purification and separation of ethanol, and the process is relatively complicated and the cost is high. The photocatalytic splitting of water to produce hydrogen can directly obtain high-purity hydrog...

Claims

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Application Information

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IPC IPC(8): B01J27/138C01B3/32
CPCC01B3/326B01J27/138B01J35/39
Inventor 刘平冯文辉吉成华王波张岩张璐璐
Owner FUZHOU UNIVERSITY
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