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Up-conversion photocatalytic material as well as preparation method and application thereof

A catalytic material and technology for converting light, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of limiting penetration depth and hindering the efficiency of upconversion luminescent photocatalysts

Pending Publication Date: 2019-02-26
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, upconversion luminescence is usually suppressed by Yb 3+ Ion sensitization, Yb after sensitization 3+ The ions respond only to excitation by narrow-band infrared light centered at about 980 nm or 980 nm, and due to the Yb 3+ Adsorption of ions and water molecules overlaps, and near-infrared light leads to a limited penetration depth, which greatly hinders the efficiency of upconversion luminescent photocatalysts
[0004] It can be seen that although the above-mentioned modification methods can adjust the TiO 2 absorption, however design and fabrication will TiO 2 It is still a great challenge to effectively extend the absorption of light into the visible and infrared regions. Therefore, it is necessary to study a new up-conversion photocatalytic material in order to solve at least some of the above-mentioned problems in the prior art.

Method used

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  • Up-conversion photocatalytic material as well as preparation method and application thereof
  • Up-conversion photocatalytic material as well as preparation method and application thereof
  • Up-conversion photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] a NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 A preparation method for a composite up-conversion photocatalytic material, comprising the steps of:

[0045] 1. NaYF 4 :Yb 3+ ,Tm 3+ Synthesis of nuclear structural materials:

[0046] (1) 3mmol RE (CH 3 COO) 3 Mix it with 45ml of octadecene and 30ml of oleic acid and add it to a 150ml volumetric flask; raise the temperature to 150°C at a rate of 10°C / 4min under nitrogen atmosphere, and keep it for 40min to form a clear liquid, and then drop it to room temperature, where, RE =Y+Yb+Tm, the purpose of this step is to dissolve and mix the raw materials evenly;

[0047] (2) Inject the clarified liquid containing 12mmol NH in the step (1) 4 F and methanol solution of 7.5mmol NaOH form a reaction system, then raise the temperature of the reaction system to 50°C at a rate of 10°C / 4min under nitrogen atmosphere, and keep it for 40min, then raise the temperature of the reaction system at a rate of 10°C / 4min to 11...

Embodiment 2

[0058] a NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 A preparation method for a composite up-conversion photocatalytic material, comprising the steps of:

[0059] 1. NaYF 4 :Yb 3+ ,Tm 3+ Synthesis of nuclear structural materials:

[0060] (1) 5mmol RE (CH 3 COO) 3Mix it with 30ml of octadecene and 40ml of oleic acid and add it to a 120ml volumetric flask; raise the temperature to 180°C at a rate of 12°C / 4min under nitrogen atmosphere, and keep it for 40min to form a clear liquid, and then drop it to room temperature, where, RE =Y+Yb+Tm, the purpose of this step is to dissolve and mix the raw materials evenly;

[0061] (2) Inject the clarified liquid containing 10mmol NH 4 F and methanol solution of 6mmol NaOH form a reaction system, then raise the temperature of the reaction system to 60°C at a rate of 5°C / 4min under nitrogen atmosphere, and keep it for 40min, and then raise the temperature of the reaction system at a rate of 10°C / 4min to 100°C, after compl...

Embodiment 3

[0071] a NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 A preparation method for a composite up-conversion photocatalytic material, comprising the steps of:

[0072] 1. NaYF 4 :Yb 3+ ,Tm 3+ Synthesis of nuclear structural materials:

[0073] (1) Add 1mmol RE(CH 3 COO) 3 Mix it with 40ml of octadecene and 10ml of oleic acid and add it to a 160ml volumetric flask; raise the temperature to 120°C at a rate of 5°C / 4min under nitrogen atmosphere, and keep it for 60min to form a clear liquid, then drop to room temperature, where, RE =Y+Yb+Tm, the purpose of this step is to dissolve and mix the raw materials evenly;

[0074] (2) Inject the clarified liquid containing 14mmol NH in the step (1) 4 F and methanol solution of 5mmol NaOH form a reaction system, then raise the temperature of the reaction system to 70°C at a speed of 15°C / 4min under nitrogen atmosphere, and keep it for 40min, and then raise the temperature of the reaction system at a speed of 10°C / 4min to 110...

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Abstract

The invention relates to a NaYF4:Yb<3+>,Tm<3+>@NaYF4:Yb3+,Nd<3+>@TiO2 composite up-conversion photocatalytic material, and belongs to the technical field of up-conversion luminescence and photocatalytic materials. The catalyst is formed by compounding NaYF4:Yb<3+>,Tm<3+>, NaYF4:Yb<3+>, Nd<3+> and TiO2, wherein the NaYF4: Yb<3+>,Tm<3+> and NaYF4:Yb<3+>, Nd<3+> form a core-shell structure, and TiO2is coated on the surface of the NaYF4:Yb<3+>, Tm<3+>@NaYF4:Yb<3+>, Nd<3+> core-shell structure. The catalyst of the invention coats TiO2 on the NaYF4:Yb<3+>, Tm<3+>@NaYF4:Yb<3+>, Nd<3+> core-shell structure, expands the wavelength range of TiO2 response, and can drive the all-optical spectral response.

Description

technical field [0001] The invention belongs to the technical field of up-conversion luminescent and photocatalytic materials, and in particular relates to a multifunctional composite photocatalyst capable of driving the entire solar spectrum and its preparation method and application. Background technique [0002] Solar energy utilization is considered to be one of the most important sciences and technologies in the 21st century, and photocatalysis is an effective technology for purifying different organic pollutants in water. From the perspective of solar energy utilization, finding semiconductor photocatalysts that can harvest the spectrum from ultraviolet to near-infrared wavelengths in sunlight and realize efficient solar energy conversion is still one of the most urgent tasks. Due to its strong catalytic performance, good chemical and thermal stability, non-toxicity and low cost, TiO 2 It has been proved to be a representative photocatalyst. However, TiO 2 With a wi...

Claims

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Application Information

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IPC IPC(8): B01J27/12C02F1/30
CPCC02F1/30B01J27/12C02F2305/10B01J35/398B01J35/39
Inventor 王泽岩黄慧宁黄柏标张晓阳秦晓燕郑昭科王朋刘媛媛张倩倩
Owner SHANDONG UNIV
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