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Method for synthesizing flower-ball-shaped bismuth phosphate nano-powder photocatalyst by microwave hydrothermal process

A bismuth phosphate nanometer, microwave hydrothermal method, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of low solar energy utilization, restricting the practical application of photocatalytic technology, and low quantum efficiency. , to achieve the effect of being conducive to large-scale promotion, novel appearance, and simple preparation method

Inactive Publication Date: 2014-08-13
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to the traditional TiO 2 Photocatalysts have shortcomings such as low quantum efficiency and low solar energy utilization, which restrict the practical application of photocatalytic technology. Therefore, the successful development and design of new high-efficiency photocatalysts is one of the key technologies for using solar energy to control environmental pollution.

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  • Method for synthesizing flower-ball-shaped bismuth phosphate nano-powder photocatalyst by microwave hydrothermal process
  • Method for synthesizing flower-ball-shaped bismuth phosphate nano-powder photocatalyst by microwave hydrothermal process
  • Method for synthesizing flower-ball-shaped bismuth phosphate nano-powder photocatalyst by microwave hydrothermal process

Examples

Experimental program
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Embodiment 1

[0011] (1) Under the condition of magnetic stirring, dissolve 0.002mol of bismuth nitrate in 30mL of deionized water, and stir for 20min to obtain solution A; (2), under the condition of magnetic stirring, dissolve 0.002mol of BmimPF 6 Add dropwise to solution A, and continue to stir for 30 minutes after the dropwise addition to obtain the precursor solution; (3), transfer the above precursor solution to a microwave hydrothermal reactor lined with polytetrafluoroethylene, and adjust the pH with nitric acid =1, the hydrothermal temperature is 180°C, microwave hydrothermal for 60min; (4), after the reaction is completed, cool to room temperature, use deionized water and absolute ethanol to wash repeatedly by centrifugation, and vacuum dry at 80°C for 12h to obtain the white target product. figure 1 Show that the powder prepared in this example is a pure phase of BiPO 4 structure, no impurity peaks appear, sharp diffraction peaks indicate good crystallinity, figure 2 It shows t...

Embodiment 2

[0013] (1) Under the condition of magnetic stirring, dissolve 0.002mol of bismuth nitrate in 30mL of deionized water, and stir for 20min to obtain solution A; (2), under the condition of magnetic stirring, dissolve 0.002mol of BmimPF 6 Add dropwise to solution A, and continue to stir for 30 minutes after the dropwise addition to obtain the precursor solution; (3), transfer the above precursor solution to a microwave hydrothermal reactor lined with polytetrafluoroethylene, and adjust the pH with nitric acid =4, the hydrothermal temperature is 200°C, microwave hydrothermal for 40min; (4), after the reaction is completed, cool to room temperature, use deionized water and absolute ethanol to wash repeatedly by centrifugation, and vacuum dry at 80°C for 12h to obtain the white target product.

Embodiment 3

[0015] (1) Under the condition of magnetic stirring, dissolve 0.002mol of bismuth nitrate in 30mL of deionized water, and stir for 20min to obtain solution A; (2), under the condition of magnetic stirring, dissolve 0.002mol of BmimPF 6 Add dropwise to solution A, and continue to stir for 30 minutes after the dropwise addition to obtain the precursor solution; (3), transfer the above precursor solution to a microwave hydrothermal reactor lined with polytetrafluoroethylene, and adjust the pH with ammonia water =8, the hydrothermal temperature is 220°C, microwave hydroheating for 20min; (4), after the reaction is completed, cool to room temperature, use deionized water and absolute ethanol to wash repeatedly by centrifugation, and vacuum dry at 80°C for 12h to obtain the white target product.

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Abstract

The invention discloses a method for synthesizing a flower-ball-shaped bismuth phosphate nano-powder photocatalyst by a microwave hydrothermal process. According to the key points of the technical scheme, the method comprises the following steps: (1) preparing a bismuth nitrate solution from bismuth nitrate and deionized water, and adding an ionic liquid 1-butyl-3-methylimidazole hexafluorophosphate in the bismuth nitrate solution under a stirring condition, thereby forming a uniform transparent solution; (2) transferring the uniform transparent solution into a hydrothermal reaction kettle, adjusting the pH of the reacting solution to 1-11 by acid or alkali, placing the hydrothermal reaction kettle into a microwave digester and lasting microwave reaction for 10-60 minutes; and (3) after reaction, cooling, centrifuging, washing and drying, thereby obtaining the flower-ball-shaped bismuth phosphate nano-powder photocatalyst. According to the method, the ionic liquid serves as a substitute for a traditional raw material to prepare the BiPO4 photocatalyst; in a reaction system, the ionic liquid can not only serve as a raw material, but also serve as a template agent for modification on the surface of BiPO4, and is capable of capturing photogenerated electrons and inhibiting the recombination of photogenerated electrons and electron holes, thereby enhancing the capability of bismuth phosphate in photocatalytically degrading organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of inorganic environment-friendly photocatalytic materials, and in particular relates to a method for synthesizing flower-shaped bismuth phosphate nano-powder photocatalysts by a microwave hydrothermal method. Background technique [0002] Since the 20th century, while enjoying the comfort and convenience brought by the rapid development of science and technology, human beings have also tasted the bitter fruit of the deteriorating living environment caused by blindness and short-sightedness. Environmental pollution has become one of the important challenges facing the world today. This issue is of great significance to the sustainable development of our society and the construction of a harmonious society. Photocatalytic degradation of pollutants is an energy-saving and efficient green technology developed in recent years. It has the advantages of low energy consumption, mild reaction conditions, and less se...

Claims

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Application Information

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IPC IPC(8): C01B25/37B01J27/186B01J35/08C02F1/30
Inventor 刘玉民吕华汤海波张鹏丁志伟李爽李紫金
Owner HENAN NORMAL UNIV
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