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Black oxygen-deficient bismuth oxide and preparation method thereof, and rare earth metal doped oxygen-deficient bismuth oxide photocatalytic material and preparation method thereof

A technology of photocatalytic materials and rare earth metals, applied in the field of photocatalysis, can solve problems such as poor light absorption efficiency, easy recombination of photogenerated electrons and holes, application limitations, etc., and achieve high-efficiency absorption enhancement, significant adsorption capacity and removal effect, and high photocatalysis performance effect

Active Publication Date: 2020-05-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single-phase photocatalysts have many inherent defects, such as poor light absorption efficiency and easy recombination of photogenerated electrons and holes, which greatly limits their application.

Method used

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  • Black oxygen-deficient bismuth oxide and preparation method thereof, and rare earth metal doped oxygen-deficient bismuth oxide photocatalytic material and preparation method thereof
  • Black oxygen-deficient bismuth oxide and preparation method thereof, and rare earth metal doped oxygen-deficient bismuth oxide photocatalytic material and preparation method thereof
  • Black oxygen-deficient bismuth oxide and preparation method thereof, and rare earth metal doped oxygen-deficient bismuth oxide photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of black oxygen-deficient bismuth oxide

[0043] 1. Preparation of bismuth oxide base material

[0044] (1) Take by weighing bismuth nitrate pentahydrate 4.85g, put into beaker;

[0045] (2) Add 100mL ultrapure water;

[0046] (3) 125 microliters of concentrated nitric acid of 65%~68% were added dropwise, stirred evenly, and the solution was clarified;

[0047] (4) Add 4.203g of citric acid monohydrate, 7.108g of acrylamide and 20.180g of glucose, and stir with ultrasound for 10min to form a homogeneous solution;

[0048] (5) Heating in a water bath at 95°C and keeping the polymerization reaction for 15 minutes;

[0049] (6) Cool the gel to precipitate and separate, and wash with ultrapure water for 3 to 5 times;

[0050] (7) The obtained powder was dried at 80° C. for 8 hours;

[0051] (8) Carry out calcination at last, and the heating program is, heat up to 300 DEG C from 25 DEG C through 275 min, keep warm for 60 min, heat up to 600 DEG C t...

Embodiment 2

[0076] Embodiment 2 dipping method prepares the black bismuth oxide of La, Ce, Er doping

[0077] One, prepare the black bismuth oxide of La doping, operate according to the following steps:

[0078] (1) preparation concentration is the aqueous solution of lanthanum nitrate hexahydrate of 216.51g / L;

[0079] (2) Get a corundum boat, add 100 microliters of the above-mentioned aqueous solution of lanthanum nitrate hexahydrate dropwise therein, and then add 100 microliters of ultrapure water;

[0080] (3) Sample 1 oxygen-deficient black Bi prepared in Example 1 was weighed 2 o 3-x Add 0.5g into the above corundum boat and stir rapidly;

[0081] (4) Stir for 6 minutes and then soak for 3 minutes, stir again for 6 minutes and then soak for 3 minutes. Repeat this process until the total time reaches 90 minutes;

[0082](5) Put it into a vacuum drying oven (vacuumize 0.1Pa) and dry at 80°C for 6h;

[0083] (6) Put the dried La-doped black bismuth oxide into the tube furnace to e...

Embodiment 3

[0104] The photocatalytic removal effect of embodiment 3 methyl orange

[0105] (1) Take by weighing respectively 0.2g of the following photocatalytic materials (prepared in Examples 1 and 2): Bi 2 o 3-x 、 Bi 2 o 3 、La / Bi 2 o 3-x 、Ce / Bi 2 o 3-x and Er / Bi 2 o 3-x ;

[0106] (2) Add 100mL of 10mg / L methyl orange (MO) solution respectively, and the initial test pH of the degradation solution is about 7.0;

[0107] (3) Prepare five 1000mL glass containers, put the suspension solution of step (2) into the glass containers respectively, and stir magnetically for 30min under dark conditions, so that the MO and the photocatalytic material reach the adsorption-desorption equilibrium. Water cooling, so that the temperature of the entire reaction during the experiment does not exceed 30 ° C;

[0108] (4) Then use a 500W xenon lamp to simulate the sunlight light source (in order to obtain strict visible light in the experiment), and use a filter (420<λ<800nm) to irradiate the s...

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Abstract

The invention discloses black oxygen-deficient bismuth oxide and a preparation method thereof. The preparation method comprises the following steps: (1) putting Bi2O3 into a corundum boat, and puttingaluminum powder into another corundum boat; (2) putting the two corundum boats into a double-temperature-zone tubular furnace, vacuumizing, and introducing inert gas for protection; (3) heating the side, with Bi2O3, of the tubular furnace from 25-30 DEG C to 400-500 DEG C after 120-150 minutes, and heating the side, with Al powder, of the tubular furnace from 25-30 DEG C to 600-800 DEG C after 120-150 minutes, wherein experiments are finished to obtain the product. The invention also discloses a rare earth metal doped oxygen-deficient bismuth oxide photocatalytic material and a preparation method thereof, wherein the preparation method comprises the following steps: (1) preparing a rare earth metal compound aqueous solution, and adding Bi2O3-x into the rare earth metal compound aqueous solution; (2) quickly stirring and dipping, and repeatedly stirring and dipping multiple times, wherein the total time is 90-210 minutes; (3) drying; and (4) calcining.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and specifically relates to a black oxygen-deficient bismuth oxide, a rare-earth metal-doped oxygen-deficient bismuth oxide photocatalytic material and a preparation method thereof. Background technique [0002] Visible-light photocatalysts are a potentially cost-effective approach to address various environmental and energy-related challenges. A good photocatalyst needs to have good light collection efficiency over the full solar spectrum, efficient charge transport to surface active sites, and high chemical stability. Bi 2 o 3 is a wide bandgap semiconductor with good electron mobility and chemical inertness, but unmodified Bi 2 o 3 In the structure, there are fewer grain boundaries, fewer defect sites, and a wider band gap (~2.8eV), which shows that the absorption capacity in the visible spectrum range is not enough, and its application as a visible light catalyst has been largely r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J35/00B01J37/02B01J37/16C02F1/30C02F101/30
CPCB01J37/16B01J37/0201B01J23/18C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 唐瑾陈志莉席缘胡天佑吕江谢文静汪楚依
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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