Magnesium doped calcium niobium oxygen nitrogen photocatalyst and preparation method thereof

A photocatalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low photocatalytic efficiency, poor material stability, environmental pollution, etc., and achieve good results and excellent solar energy. Effects of photocatalytic water splitting for hydrogen production and photodegradation of formaldehyde

Inactive Publication Date: 2019-01-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN 106390740A discloses a photocatalytic degradation of formaldehyde film, the nanoscale photocatalytic material TiO 2 Adding it to the hard coating of automobile film, architectural film and household film in a certain way ensures the original performance of the product, and does not change the hardness, scratch resistance, transmittance, etc. of the original film hard coating, and increases the degradation The function of formaldehyde, where TiO 2 is a common photocatalyst material, but TiO 2 It only responds to ultraviolet light, and the utilization rate of visible light in sunlight is not high, and the photocatalytic efficiency is low
Another common photocatalyst, CdS (The Journal of Physical Chemistry C, 115(2011) 11466-11473), is not suitable because the material itself is not stable, prone to self-corrosion, and contains toxic metals, which is easy to pollute the environment. very ideal

Method used

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  • Magnesium doped calcium niobium oxygen nitrogen photocatalyst and preparation method thereof
  • Magnesium doped calcium niobium oxygen nitrogen photocatalyst and preparation method thereof
  • Magnesium doped calcium niobium oxygen nitrogen photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0028] Preparation of CaNb by Sol-Gel Method 1-x Mg x o 2+y N 1-y

[0029] Prepare CaNb according to different Nb / Mg ratios in Table 1 by sol-gel method 1-x Mg x o 2+y N 1-y and perform performance testing. At a temperature of 298K, mix acetic acid and acetic anhydride to obtain transparent solution S1; mix niobium pentachloride and absolute ethanol to obtain transparent solution S2; mix solution S1 and solution S2, and vigorously stir to obtain Mix solution S3; add calcium nitrate tetrahydrate and magnesium acetate tetrahydrate to the mixed solution S3, and stir vigorously until the solution is clear, which is marked as solution S4; put solution S4 in an oven, and keep it warm at 323K for 2-72 hours, The white precipitate P1 is obtained; the white precipitate P1 is filtered at 323K and kept for 12-72 hours, then placed in an inert atmosphere (nitrogen or argon) and burned at 523K-623K for 3-8 hours, and continued to be under the protection of oxygen Burn at 873K-973K...

Embodiment 6-10

[0037] Preparation of CaNb by PC method 1-x Mg x o 2+y N 1-y

[0038] Prepare CaNb according to different Nb / Mg ratios in Table 3 by sol-gel method 1-x Mg x o 2+y N 1-y and perform performance testing. Under the condition of temperature of 298K, dissolve 7.8g of anhydrous citric acid into 30mL of ethylene glycol and stir for 30 minutes to obtain a transparent solution S1; dissolve niobium pentachloride in ethanol to obtain a transparent solution S2; 1. Calcium nitrate tetrahydrate and magnesium acetate tetrahydrate were added to solution S1, and continued to stir for 30 minutes to obtain transparent solution S3; solution S3 continued to heat up to 473K-523K under stirring conditions until it became brownish red transparent solution S4; stop stirring , the temperature is further raised to 563K-583K, and the brown-red transparent solution S4 is further polymerized to form brown-red colloid G1; under the air atmosphere, colloid G1 is placed in a muffle furnace and burned ...

Embodiment 11-15

[0045] Preparation of CaNb by coprecipitation method 1-x Mg x o 2+y N 1-y

[0046] Prepare CaNb according to different Nb / Mg ratios in Table 5 by co-precipitation method 1-x Mg x o 2+y N 1-y and perform performance testing. Under the condition of temperature at 298K, dissolve calcium nitrate tetrahydrate, magnesium acetate tetrahydrate and niobium pentachloride ethanol solution in 100mL deionized water to obtain transparent solution S1; dissolve 20g of sodium hydroxide in 100mL deionized water to obtain Transparent solution S2; add the S2 solution drop by drop to the stirred S1 solution at a rate of about 40 drops per minute, from the beginning of the drop to the end of the stirring, the entire process takes 6 hours, and the product is a flocculent white oxide. Wash with deionized water until the pH value is neutral, place in an oven to obtain powder P1 (metal oxide precursor); the prepared metal oxide precursor powder is placed in an alumina crucible, under the protec...

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PUM

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Abstract

The invention relates to a magnesium doped calcium niobium oxygen nitrogen photocatalyst and a preparation method thereof. The photocatalyst comprises an active component and a cocatalyst. The molecular formula of the active component is CaNb1-xMgxO2+yN1-y, wherein, 0<=x, y<=1, the synthetic method thereof comproses a sol-gel method, a PC method, a coprecipitation method and a fusion salt method.The above method can obtain pure phase sample of CaNb1-xMgxO2+yN1-y, and the visible light absorption can be continuously adjusted in a range of 550nm-600nm as different magnesium doped amounts, the prepared CaNb1-xMgxO2+yN1-y exhibits excellent photocatalytic water splitting hydrogen and formaldehyde degradation properties after carrying a proper cocatalyst.

Description

technical field [0001] The invention belongs to the technical field of nanometer photocatalytic materials, and in particular relates to a magnesium-doped calcium-niobium-oxygen-nitrogen photocatalyst and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the demand for energy in human society is getting higher and higher, and the fossil fuels that are the main source of energy today will be exhausted within hundreds of years, and the toxic and harmful gases released after burning will bring Greenhouse effect, acid rain, smog and other serious environmental problems. In order to solve the increasingly serious energy crisis and environmental problems, it is particularly important to develop a new type of green energy. [0003] Solar energy is an inexhaustible renewable clean energy. It is reported that the sun can continue to burn for 5 billion years, and the energy reaching the earth's surface in one hour can meet th...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06B01D53/86B01D53/72
CPCB01D53/8668C25B1/04C25B11/04B01J27/24B01J35/39Y02E60/36
Inventor 徐晓翔汪亚威喻金星
Owner TONGJI UNIV
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