Carbon-modified silver phosphate/titanoniobate compound visible light pholocatalyst and preparation thereof

A technology of titanium niobate and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of weak visible light activity, achieve good modification effect, increase specific surface area, contact tight effect

Active Publication Date: 2014-06-25
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the compounds formed by these two transition elements show good stability and solid acid catalytic activity, they are weak in visible light activity in catalytic engineering and need to be modified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Will Nb 2 o 5 、TiO 2 and K 2 CO 3 Weigh and mix at a molar ratio of 1:3:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 1150°C at a rate of 15°C / min, keep warm for 10h, and take it out after naturally cooling to room temperature. further grind into solid powder in a bowl to obtain KTiNbO 5 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20mL of tetramethylammonium bromide solution with a concentration of 100mmol / L, and stirred for 2h to form a modified KTiNbO 5 Suspension; at 25°C, with continuous stirring, dissolve 3g of ammonium carbamate in 10ml of methanol, and add 2g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 25°C, Adding silver organic complexes to modified KTiNbO 5 In the suspension, stir for 4 hours, precipitate and separate, and dry at 85°C; place the dried product in a vacuum tube furnace, raise the temperature to 600°C under vacuum, keep it for 3 h...

Embodiment 2

[0020] Will Nb 2 o 5 、TiO 2 and K 2 CO 3 Weigh and mix at a molar ratio of 1:2:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 1150°C at a rate of 10°C / min, keep warm for 8 hours, take it out after naturally cooling to room temperature, and put it in an agate grinder. further grind into solid powder in a bowl to obtain KTiNbO 5 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20 mL of tetramethylammonium bromide solution with a concentration of 50 mmol / L, and stirred for 2 h to form a modified KTiNbO 5 Suspension; at 20°C, keep stirring, dissolve 2g of ammonium carbamate in 10ml of methanol, and add 1g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 20°C, Adding silver organic complexes to modified KTiNbO 5 In the suspension, stir for 2 hours, precipitate and separate, dry at 60°C, place the dried product in a vacuum tube furnace, raise the temperature to 500°C under vacu...

Embodiment 3

[0023] Will Nb 2 o 5 、TiO 2 and K 2 CO 3 Weigh and mix at a molar ratio of 1:2:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 1150°C at a rate of 10°C / min, keep warm for 9 hours, take it out after naturally cooling to room temperature, and put it in an agate grinder. further grind into solid powder in a bowl to obtain KTiNbO 5 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20mL of tetramethylammonium bromide solution with a concentration of 100mmol / L, and stirred for 2h to form a modified KTiNbO 5 Suspension; at 25°C, with continuous stirring, dissolve 3g of ammonium carbamate in 10ml of methanol, and add 2g of silver oxide, after stirring, the silver oxide gradually dissolves to form an organic complex of silver; at 25°C, Adding silver organic complexes to modified KTiNbO 5 In the suspension, stir for 3 hours, precipitate and separate, and dry at 75°C; place the dried product in a vacuum tube furnace, raise the temperature to 600...

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PUM

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Abstract

The invention discloses a carbon-modified silver phosphate / titanoniobate compound visible light pholocatalyst and a preparation thereof. The preparation method comprises the following specific steps: mixing and grinding Nb2O5, TiO2 and K2CO3, then heating to obtain KTiNbO5 powder; adding KTiNbO5 powder to four methyl ammonium bromide solution and stirring to obtain a modified KTiNbO5 suspension; dissolving ammonium carbamate in methanol at the temperature of 20-25 DGE C and adding silver oxide to obtain the organic complexes of silver; adding the organic complexes of silver to the modified KTiNbO5 suspension, stirring, separating, drying, and calcining in a vacuum state, keeping for 2-3 hours, adding a small amount of air, taking out after natural cooling, grinding, adding into a phosphoric acid solution, depositing, separating, and drying to obtain a carbon-modified silver phosphate / titanoniobate compound visible light pholocatalyst. The preparation method disclosed by the invention has the advantages that silver and carbon are connected directly and tightly, the modification effect is relatively good, and a plurality of neterogeny semiconductor doped materials are adopted, and the catalytic ability is greatly improved.

Description

technical field [0001] The invention relates to the field of new materials for environmental pollution control, in particular to a carbon-modified silver phosphate / titanium niobate composite visible light photocatalyst and a preparation method thereof. Background technique [0002] With the development of science and technology, toxic organic pollutants from industrial and agricultural production seriously threaten the environment and human health. It is of great significance to seek a new and efficient environmental governance technology. Photocatalytic technology has become an emerging environmental treatment technology with important application prospects due to its advantages of energy saving, high efficiency, complete pollutant degradation, and no secondary pollution. In recent years, the development of new and efficient visible light photocatalysts has become an important research content in photocatalytic technology. Among them, photocatalytic materials with surface p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J35/10C02F1/30C02F101/38
Inventor 马建锋李良银邹静姚超
Owner 溧阳常大技术转移中心有限公司
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