Preparation method for transition of photocatalysis material on Yb3+-Er3+-Tm3+ doped CaF2 matrix loaded Cr3+-Bi2WO6

A catalytic material and a technology for converting light, applied in the field of photocatalytic materials, can solve the problems of difficulty in obtaining, not mentioned, and high cost of fluoride, and achieve the effects of improving utilization efficiency, broad application prospects and simple preparation process

Active Publication Date: 2013-09-04
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

According to the existing literature reports, with photocatalytic materials (TiO 2 or CdS) composite upconversion matrix materials mainly include rare earth fluorides such as NaYF 4 (Related literature: ACS Appl.Mater.Interfaces2011, 3, 3239; Appl.Catal.B: Environ.2010, 100, 433), YF 3 (Related literature: Chem.Commun.2010, 46, 2304), LaF 3 (Related literature: Adv.Mater.2010, 22, 4373), etc., these fluorides are expensive and difficult to obtain, therefore, it is difficult to be applied in practice
In 2010, Qin Weiping of Jilin University (Patent No.: CN102737852A) mentioned the use of CaF 2 As an up-conversion host material for carrying rare earth ions, but there is no mention of doping CaF with rare earth 2 with Bi 2 WO 6 Combined, not to mention rare earth doped CaF 2 with Cr 3+ -Bi 2 WO 6 Preparation of relevant upconversion photocatalytic materials by combining
[0005] At present, the preparation of up-conversion photocatalytic materials is still a brand-new technical field. The performance of up-conversion photocatalytic materials that have been reported is not ideal, and the better effect of Cr 3+ Doped with Bi 2 WO 6 The preparation of photocatalytic materials has not been described in the literature, and Yb with near-infrared light up-conversion effect and high-efficiency photocatalytic effect 3+ -Er 3+ -Tm 3+ Triple doped CaF 2 Matrix-loaded Cr 3+ -Bi 2 WO 6 Up-conversion photocatalytic materials have not been reported in the literature

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment relates to a kind of Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 Matrix-loaded Cr 3+ -Bi 2 WO 6 A preparation method for an up-conversion photocatalytic material, comprising the steps of:

[0029] Step 1, the hydrofluoric acid that the mass fraction is 40% is added dropwise to Yb 3+ :Er 3+ :Tm 3+ : Ca 2+ The molar ratio is 0.2: 0.02: 0.02: 1 concentration is in 0.056mol / L nitrate solution, stirs evenly, obtains colloidal solution A;

[0030] Step 2, put the colloid solution A into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 180°C for 12 hours, and calcinate at 500°C for 4 hours to obtain powder B;

[0031] Step 3, powder B is added to the Bi(NO 3 ) 3 ·5H 2 O aqueous solution, where Bi 3+ :Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 (Powder B) with a molar ratio of 1:0.1, stirred to obtain colloidal solution C;

[0032] Step 4, the concentration is the Na of 0.1mol / L 2 WO 4 2H 2 O aqueous solution is added in the colloidal solution...

Embodiment 2

[0037] This embodiment relates to a kind of Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 Matrix-loaded Cr 3+ -Bi 2 WO 6 A preparation method for an up-conversion photocatalytic material, comprising the steps of:

[0038] Step 1, the hydrofluoric acid that the mass fraction is 40% is added dropwise to Yb 3+ :Er 3+ :Tm 3+ : Ca 2+ The molar ratio is 0.2: 0.02: 0.02: 1 concentration is in 0.056mol / L nitrate solution, stirs evenly, obtains colloidal solution A;

[0039] Step 2, put the colloid solution A into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 180°C for 12 hours, and calcinate at 500°C for 4 hours to obtain powder B;

[0040] Step 3, powder B is added to the Bi(NO 3 ) 3 ·5H 2 O aqueous solution, where Bi 3+ :Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 (Powder B) with a molar ratio of 1:0.3, stirred to obtain colloidal solution C;

[0041] Step 4, the concentration is the Na of 0.1mol / L 2 WO 4 2H 2 O aqueous solution is added in the colloidal solution...

Embodiment 3

[0046] This embodiment relates to a kind of Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 Matrix-loaded Cr 3+ -Bi 2 WO 6 A preparation method for an up-conversion photocatalytic material, comprising the steps of:

[0047] Step 1, the hydrofluoric acid that the mass fraction is 40% is added dropwise to Yb 3+ :Er 3+ :Tm 3+ : Ca 2+ The molar ratio is 0.2: 0.02: 0.02: 1 concentration is in 0.056mol / L nitrate solution, stirs evenly, obtains colloidal solution A;

[0048] Step 2, put the colloid solution A into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 180°C for 12 hours, and calcinate at 500°C for 4 hours to obtain powder B;

[0049] Step 3, powder B is added to the Bi(NO 3 ) 3 ·5H 2 O aqueous solution, where Bi 3+ :Yb 3+ -Er 3+ -Tm 3+ doped CaF2 (Powder B) with a molar ratio of 1:0.9, stirred to obtain colloidal solution C;

[0050] Step 4, the concentration is the Na of 0.1mol / L 2 WO 4 2H 2 O aqueous solution is added in the colloidal solution C...

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Abstract

The invention provides a preparation method for transition of photocatalysis material on Yb3+-Er3+-Tm3+ doped CaF2 matrix loaded Cr3+-Bi2WO6, which comprises the following steps: 1. adding hydrofluoric acid into a nitrate liquid, uniformly stirring, and obtaining a colloidal solution A; 2. placing the colloidal solution A into a reaction vessel, centrifuging, drying, calcining, and obtaining the powder B; 3. adding powder B into the aqueous solution of Bi(NO3)3x5H2O, stirring and obtaining the colloidal solution C; 4. adding the aqueous solution of Na2WO4x2H2O into the colloidal solution C, stirring and obtaining the colloidal solution D; 5. adding Cr(NO3)3x9H2O into a colloidal solution D, stirring and obtaining the colloidal solution E; 6. 2. placing the colloidal solution E into a reaction vessel, centrifuging, drying, calcining and obtaining the product; The invention improves the utilization efficiency of sunlight, simple preparation technology and low cost.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a Yb 3+ -Er 3+ -Tm 3+ doped CaF 2 Matrix-loaded Cr 3+ -Bi 2 WO 6 Preparation method of up-conversion photocatalytic material. Background technique [0002] At present, environmental and energy issues are major issues that we need to solve urgently. Photocatalysis is an environmental pollution control technology that uses photocatalytic materials to absorb light of a certain wavelength to drive photochemical reactions, thereby degrading organic matter in wastewater. Photocatalytic materials mainly include TiO 2 , CdS, Bi 2 WO 6 etc., among them, Bi 2 WO 6 It is a typical n-type direct bandgap bismuth-based semiconductor photocatalytic material. Its forbidden band width is 2.7eV and its absorption band edge is about 459nm. But this also means that visible light and near-infrared light with a wavelength greater than 459nm in sunlight cannot be utilized. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30
CPCY02W10/37
Inventor 朱南文黄寿强楼紫阳袁海平单爱党谷麟苗琛金宁奔于豹
Owner SHANGHAI JIAO TONG UNIV
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