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Heptamolybdate intercalated porous carbon nitride as well as preparation method and application thereof

A technology of carbon nitride and ammonium heptamolybdate tetrahydrate, which is applied in chemical instruments and methods, chemical/physical processes, special compound water treatment, etc. Short life of runners and other problems, to achieve the effect of good recyclability, easy access to raw materials, and simple operation

Active Publication Date: 2020-04-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bulk g-C 3 N 4 Due to the weak light absorption ability, easy recombination of photogenerated electrons and holes, and short carrier life, improving the utilization rate of visible light has always been a challenging problem in research.

Method used

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  • Heptamolybdate intercalated porous carbon nitride as well as preparation method and application thereof
  • Heptamolybdate intercalated porous carbon nitride as well as preparation method and application thereof
  • Heptamolybdate intercalated porous carbon nitride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of two-dimensional porous layered Mo-UCN, the specific steps are as follows:

[0033] (1) Weigh 5g of dicyandiamide and 1-15g of urea into 40mL of water, place the mixture in a constant temperature water bath at 80°C, and magnetically stir until completely dissolved. Weigh an appropriate amount of ammonium heptamolybdate tetrahydrate (0.015 ~ 0.1g) into the above solution, and continue to stir until the water evaporates completely to obtain a solid mixture;

[0034] (2) After grinding the solid mixture obtained in step (1) into powder, place it in a 50mL ceramic crucible, and continue roasting at 550°C for 3h in a muffle furnace (the heating rate is 2°C / min), naturally Cool to normal temperature to obtain the product catalyst, named as x wt% Mo-UCN-y, wherein x represents the mass ratio (0.3~2) of the preferred ammonium heptamolybdate tetrahydrate and dicyandiamide: 1, and y represents the preferred urea and dicyandiamide The mass ratio of cyanamide (0.2~3)...

Embodiment 2

[0036] Detect the visible light degradation effect of the two-dimensional porous layered Mo-UCN prepared in Example 1 on BPA, the specific operations are as follows:

[0037] (1) Add 50mL of BPA solution (10mg·L -1 ) and 50mg catalyst;

[0038] (2) Under dark conditions, magnetically stir the suspension for 30 minutes to achieve adsorption-desorption equilibrium;

[0039] (3) Then in visible light (wavelength λ>420nm, light intensity 20mw cm -2 ) to catalyze the reaction. Samples were taken at regular intervals, passed through a 0.45 μm filter membrane to obtain clear liquid, and the change of BPA concentration in the solution was determined by high performance liquid chromatography.

[0040] image 3 0.8wt% Mo-UCN-0.2~3 prepared for different amounts of pore-forming agents on the photodegradation performance spectrum of BPA, Figure 4 The photodegradation performance map of BPA prepared by 0.3-4wt% Mo-UCN-2 for different molybdenum source contents; from image 3 with 4 I...

Embodiment 3

[0042] Detect the stability and recycling effect of the two-dimensional porous layered Mo-UCN prepared in Example 1, and use 0.8wt% Mo-UCN-2 with the best catalytic activity as the target sample for testing. The specific operations are as follows:

[0043] (1) Add 50mg of 0.8wt% Mo-UCN-2 catalyst and 50mL of BPA solution (10mg·L -1 );

[0044] (2) Under dark conditions, magnetically stir the suspension for 30 minutes to achieve adsorption-desorption equilibrium;

[0045] (3) Then in visible light (wavelength λ>420nm, light intensity 20mw cm -2 ) to catalyze the reaction. Samples were taken at regular intervals, passed through a 0.45 μm filter membrane to obtain clear liquid, and the change of BPA concentration in the solution was determined by high performance liquid chromatography.

[0046] (4) After the photocatalytic reaction, the remaining suspension was passed through a 0.45 μm filter membrane, washed and dried to obtain the residual catalyst, and steps (1) to (4) were...

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Abstract

The invention relates to heptamolybdate intercalated porous carbon nitride as well as a preparation method and an application thereof. The preparation method comprises the step of carrying out a thermal polymerization reaction by taking dicyandiamide as a precursor, ammonium heptamolybdate tetrahydrate as a molybdenum source and urea as a pore-forming agent. A photocatalyst provided by the invention is strong in response to visible light, high in phenol pollutant degradation efficiency and good in cyclic utilization, and the preparation process has the advantages of being simple to operate, mild in reaction, green, environment-friendly, low in cost and the like, and shows a wide application prospect in the field of environmental photocatalysis.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a heptamolybdate-intercalated porous carbon nitride and its preparation method and application. Background technique [0002] With the rapid development of the petrochemical industry, a large number of phenolic substances are discharged into natural water bodies (such as surface water and groundwater) by humans, and their diversity, persistence, endocrine disruption and acute toxicity seriously threaten the health of ecosystems and humans . Therefore, how to effectively remove persistent phenolic compounds in wastewater, reduce the risk of pollution, and realize water recycling is an urgent problem to be solved at present. Traditional sewage treatment processes, such as adsorption, aerobic / anaerobic biological methods, sedimentation filtration, ion exchange, etc., cannot effectively treat such pollutants, and have disadvantages such as high cost, complicated steps, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/34
CPCB01J27/24C02F1/30C02F2101/345C02F2305/10B01J35/39
Inventor 张塞艾玥洁文涛王祥科
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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