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Carbon modified silver phosphate/niobium tungesate composite visible light catalyst and preparation method thereof

A niobium tungstate, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as weak photoactivity, and achieve improved catalytic ability, tight contact, and modification effects. Good results

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 two transition elements, niobium and tungsten, 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] WO 3 , Nb 2 o 5 and K 2 CO 3 Weigh and mix at a molar ratio of 3:1:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 900°C at a rate of 15°C / min, keep warm for 10h, and take it out after naturally cooling to room temperature. further ground into a solid powder in a bowl to obtain KNbWO 6 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20 mL of tetramethylammonium bromide solution with a concentration of 200 mmol / L, and stirred for 2 h to form a modified KNbWO 6 Suspension; at 25°C, with continuous stirring, dissolve 3g of ammonium carbamate in 10ml of methanol, and add 2g of silver oxide, and stir to form an organic complex of silver; at 25°C, dissolve the organic complex of silver compound added to the modified KNbWO 6 In the suspension, stir for 2 to 4 hours, precipitate and separate, dry at 85°C, and exchange the organic complex of silver to KNbWO through distribution. 6 Between layers: place the dried product in a vacuum t...

Embodiment 2

[0020] WO 3 , Nb 2 o 5 and K 2 CO 3 Weigh and mix at a molar ratio of 2:1:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 750°C at a rate of 10°C / min, keep it warm for 8 hours, and take it out after naturally cooling to room temperature. further ground into a solid powder in a bowl to obtain KNbWO 6 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20mL of tetramethylammonium bromide solution with a concentration of 60mmol / L, and stirred for 2h to form a modified KNbWO 6 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, The organic complex of silver was added to the modified KNbWO 6 In the suspension, stir for 2 hours, precipitate and separate, dry at 60°C, and exchange the organic complex of silver to KNbWO through distribution 6 Between layers: put the dried product...

Embodiment 3

[0023] WO 3 , Nb 2 o 5 and K 2 CO 3 Weigh and mix at a molar ratio of 2:1:1, grind evenly in an agate mortar, add to a corundum crucible, heat to 800°C at a rate of 10°C / min, keep warm for 10h, and take it out after naturally cooling to room temperature. further ground into solid powder in a bowl to obtain KNbWO 6 powder; KTiNbO with a weight of 5 g 5 The powder was added to 20 mL of tetramethylammonium bromide solution with a concentration of 200 mmol / L, and stirred for 2 h to form a modified KNbWO 6 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, The organic complex of silver was added to the modified KNbWO 6 In the suspension, stir for 3 hours, precipitate and separate, dry at 85°C, and exchange the organic complex of silver to KNbWO through distribution 6 Between layers: place the dried...

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Abstract

The invention discloses a carbon modified silver phosphate / niobium tungesate composite visible light catalyst and a preparation method thereof. The preparation method comprises the following steps of mixing WO3, Nb2O5 and K2CO3, uniformly grinding the mixture, and heating the mixture to obtain KNbWO6 powder; adding the KNbWO6 powder into tetramethyl ammonium bromide solution, and stirring to obtain modified KNbWO6 turbid liquid; dissolving ammonium carbamate into methanol at 20 to 25 DEG C, and adding silver oxide to form an organic complex of silver; adding the organic complex of the silver into the modified KNbWO6 turbid liquid, stirring, separating and drying; calcining in vacuum, maintaining the state for 2h to 3h, introducing little air, naturally cooling, taking out and grinding; adding the ground mixture into a phosphoric acid solution, and precipitating, separating and drying the reaction product to obtain the carbon modified silver phosphate / niobium tungesate composite visible light catalyst. The method has the advantages that the silver directly comes into close contact with carbon, so that the decorative effect is better, and the catalytic capacity of the material is greatly improved by mutually doping multiple heterogeneous semiconductors.

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 / niobium tungstate 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/195C02F1/30
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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