Preparation method of rare-earth element doped modified hollow microsphere bismuth oxyiodide photocatalyst

A rare earth element, bismuth iodide technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve complex and diverse pollutants that cannot be completely degraded, and difficult to degrade by microbial methods. It can achieve good application prospects, improved photocatalytic degradation performance, and high reusability.

Inactive Publication Date: 2018-01-19
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these common methods of dealing with pollutants can solve part of the pollution to a certain extent, some of these technologies still have some shortcomings.
For example, microbial methods are often difficult to completely degrade some pollutants
Physical sedimentation method is also difficult to completely degrade pollutants fundamentally
The chemical oxidation method uses selective oxidants, but it is not conducive to recycling, and it cannot completely degrade complex and diverse pollutants

Method used

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  • Preparation method of rare-earth element doped modified hollow microsphere bismuth oxyiodide photocatalyst
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  • Preparation method of rare-earth element doped modified hollow microsphere bismuth oxyiodide photocatalyst

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Effect test

Embodiment 1

[0033] (1) 0.002mmol bismuth nitrate pentahydrate was mixed with 0% (as a control group), 1%, 2%, 3%, 4%, 5% (Y 3+ Bi 3+ molar ratio) of the yttrium element nitrate mixed into 20mL ethylene glycol solvent, magnetic stirring (60rpm) 3h, fully dissolved, to obtain 5 groups of bismuth nitrate solutions containing yttrium element with different contents.

[0034] (2) Add 0.002 mmol of potassium iodide into 20 mL of ethylene glycol solvent, stir magnetically (60 rpm) for 1 hour, and fully dissolve to obtain a potassium iodide solution.

[0035] (3) under magnetic stirring (60rpm), the potassium iodide solution obtained by step (2) is added dropwise at a constant speed (3 drops / second) to the bismuth nitrate solution containing yttrium element in different contents obtained by step (1), drop After the addition, continue magnetic stirring for 0.5h to obtain the precursor solution, put it in a polytetrafluoroethylene high-temperature reactor and react at 120°C for 12h, with a heating...

Embodiment 2

[0038] (1) 0.002mmol bismuth nitrate pentahydrate was mixed with 1%, 2%, 3%, 4%, 5% (Ce 3+ Bi 3+ molar ratio) of cerium nitrate mixed with 20mL ethylene glycol solvent, magnetic stirring (60rpm) 3h, fully dissolved, to obtain 5 groups of bismuth nitrate solutions containing cerium with different contents.

[0039](2) Under magnetic stirring (60rpm), the potassium iodide solution obtained in step (2) of embodiment 1 is added dropwise at a constant speed (3 drops / second) to the bismuth nitrate solution containing cerium element in different contents obtained in step (1) After the dropwise addition, continue magnetic stirring for 0.5h to obtain the precursor solution, place it in a polytetrafluoroethylene high-temperature reactor and react at 120°C for 12h, with a heating rate of 5°C / min, and naturally cool down to room temperature after the reaction and take it out , washed three times with ethanol and water respectively, dried in a vacuum oven at 60°C for 12 hours, and ground ...

Embodiment 3

[0042] (1) 0.002mmol bismuth nitrate pentahydrate was mixed with 1%, 2%, 3%, 4%, 5% (Pr 3+ Bi 3+ The nitrate of the praseodymium element) is mixed and added in 20mL ethylene glycol solvent, magnetically stirred (60rpm) for 3h, fully dissolved, and 5 groups of bismuth nitrate solutions containing praseodymium element with different contents are obtained.

[0043] (2) under magnetic stirring (60rpm), the potassium iodide solution obtained in embodiment 1 step (2) is added dropwise at a constant speed (3 drops / second) to the bismuth nitrate solution containing praseodymium element in different contents obtained in step (1) After the dropwise addition, continue magnetic stirring for 0.5h to obtain the precursor solution, place it in a polytetrafluoroethylene high-temperature reactor and react at 120°C for 12h, with a heating rate of 5°C / min, and naturally cool down to room temperature after the reaction and take it out , washed three times with ethanol and water respectively, dri...

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Abstract

The invention relates to a preparation method of a rare-earth element doped modified hollow microsphere bismuth oxyiodide photocatalyst. The preparation method comprises the following steps: adding bismuth nitrate pentahydrate and nitrate of a rare-earth element into a solvent and sufficiently dissolving to obtain a bismuth nitrate solution containing the rare-earth element; under magnetic stirring, dropwise adding a potassium iodide solution at a uniform speed drop by drop; after finishing dropwise adding, continually carrying out the magnetic stirring to obtain a precursor solution; puttingthe precursor solution into a reaction kettle to react by adopting a solvothermal method; after finishing the reaction, cooling a product to room temperature and taking out the product; washing, drying in vacuum and grinding to obtain the rare-earth element doped modified hollow microsphere bismuth oxyiodide photocatalyst. The method provided by the invention is simple and feasible and has the characteristics of simple process, good experiment reproducibility, low production cost and the like; the prepared rare-earth element doped composite photocatalyst has good photocatalytic degradation performance on organic pollutant and a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a method for preparing a rare earth element-doped modified hollow microsphere bismuth oxyiodide photocatalyst. Background technique [0002] Since the 20th century, while enjoying the comfort and convenience brought by the rapid development of industry and technology, human beings have also tasted the bitter fruit of the deteriorating living environment caused by blindness and short-sightedness. The global warming, the destruction of the ozone layer, and the loss of biodiversity discovered this year are all the direct results of environmental degradation in the 20th century. Chemical plants and power plants will emit a lot of toxic substances, such as CO and SO 2 , NO 2 NO, etc. will cause serious pollution to the atmosphere; environmental pollution not only comes from these, but also from all aspects of production and life. Pollution, environmental protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/30
Inventor 毛志平马曾强张琳萍徐红钟毅隋晓锋王碧佳
Owner DONGHUA UNIV
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