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Inorganic ion doped carbon nitride photocatalyst and preparation method thereof

A technology of inorganic ions and catalysts, applied in the field of photocatalysis, can solve the problems of low specific surface area of ​​carbon nitride, high recombination rate of photogenerated electrons and holes, and unsatisfactory activity of carbon nitride, etc., and achieve simple and easy-to-operate equipment Effect

Active Publication Date: 2013-09-18
重庆传森迅特科技有限公司
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Problems solved by technology

However, due to the low specific surface area of ​​carbon nitride, the high recombination rate of photogenerated electrons and holes, and the existence of a large number of structural defects, the activity of carbon nitride under visible light is not ideal, which limits the large-scale application of carbon nitride.

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  • Inorganic ion doped carbon nitride photocatalyst and preparation method thereof
  • Inorganic ion doped carbon nitride photocatalyst and preparation method thereof
  • Inorganic ion doped carbon nitride photocatalyst and preparation method thereof

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preparation example Construction

[0050] The invention provides a method for preparing an inorganic ion-doped carbon nitride photocatalyst, which comprises the following steps:

[0051] The carbon nitrogen source and the inorganic salt are thoroughly mixed in the aqueous solution and then dried and calcined to obtain an inorganic ion-doped carbon nitride photocatalyst having the molecular formula represented by formula (I):

[0052] [X] m [C 3 N 4 ] (1-m) (I);

[0053] Among them, m is 1%-40%, preferably 2%-20%, more preferably 5%-15%;

[0054] The carbon nitrogen source is a raw material for preparing carbon nitride, preferably monocyanamide, dicyandiamine, melamine, cyanuric acid, thiourea or urea;

[0055] The inorganic salt is potassium chloride, potassium bromide, potassium iodide, ammonium chloride, ammonium bromide, ammonium iodide, potassium nitrate, potassium sulfate, potassium carbonate, potassium dihydrogen phosphate, calcium chloride, magnesium chloride, barium chloride , Ammonium sulfate, ammonium nitrat...

Embodiment 1

[0071] Dissolve 0.126 g of potassium chloride with deionized water, and add 4 g of cyanamide to the potassium chloride solution, stir and mix thoroughly. After drying the resulting mixture at 60°C, it is heat-treated at 550°C for 2h. After the temperature is cooled to room temperature, the reaction product is ground into a powder for use.

[0072] The obtained photocatalyst was analyzed by XRD and XPS, and the results showed that. The molecular formula of the potassium chloride doped carbon nitride photocatalyst prepared in this embodiment is [KCl] 0.03 [C 3 N 4 ] 0.97 .

[0073] In the present invention, the obtained potassium chloride doped carbon nitride photocatalyst is subjected to UV-vis DRS analysis, and the results are as follows figure 1 Shown. The results show that the forbidden band width of the potassium chloride doped carbon nitride photocatalyst prepared in this example is 2.52eV, which has a large absorption of visible light; the present invention performs PL analy...

Embodiment 2

[0076] Dissolve 0.089 g of potassium bromide with deionized water, and add 4 g of dicyandiamide to the potassium bromide solution, stir and mix thoroughly. After drying the resulting mixture at 60°C, it is heat-treated at 500°C for 3h. After the temperature is cooled to room temperature, the reaction product is ground into a powder for use.

[0077] The obtained photocatalyst was analyzed by XRD and XPS, and the results showed that. The molecular formula of the potassium bromide doped carbon nitride photocatalyst prepared in this embodiment is [KBr] 0.05 [C 3 N 4 ] 0.95 .

[0078] In the present invention, the obtained potassium bromide doped carbon nitride photocatalyst is analyzed by SEM, and the results are as follows image 3 Shown. by image 3 It can be seen that the potassium bromide doped carbon nitride photocatalyst obtained in this embodiment has a two-dimensional layered nanosheet structure, and the doping of potassium bromide does not damage the carbon nitride structur...

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Abstract

The invention provides an inorganic ion doped carbon nitride photocatalyst and a preparation method thereof. The inorganic ion doped carbon nitride photocatalyst has a molecular formula shown in a formula (I). The preparation method comprises the following steps of: sufficiently mixing carbon and nitrogen sources and inorganic salt in a water solution, then drying and calcining to obtain the inorganic ion doped carbon nitride photocatalyst which has the molecular formula shown in the formula (I). According to the photocatalyst, inorganic ions enter a crystal lattice or an interlayer of C3N4, and visible-light catalytic activity of the C3N4 photocatalyst provided by the invention is greatly enhanced through the doping of the inorganic ions. Experiments indicate that the visible-light catalytic activity of the inorganic ion doped C3N4 photocatalyst with a two-dimensional structure is 1.5-3 times higher than that of a photocatalyst without C3N4 doped. Besides, the preparation method provided by the invention is moderate in condition, easy to operate and favorable to large-scale production.

Description

Technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a carbon nitride photocatalyst doped with inorganic ions and a preparation method thereof. Background technique [0002] At present, human beings are facing two basic problems: environmental pollution and energy shortage. How to effectively use sustainable clean solar energy to solve environmental and energy problems has attracted more and more attention and attention from all over the world. In recent years, with the development of photocatalytic technology, the use of solar energy to achieve photocatalytic technology has shown great application potential in the field of environmental pollution purification and the conversion of solar energy into chemical energy. [0003] It is the photocatalytic material that plays an important role in the photocatalysis process. Because the visible light-driven photocatalyst can directly use sunlight or human light, and has shown great applic...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/25
Inventor 董帆李秋燕王震宇孙艳娟赵再望傅敏
Owner 重庆传森迅特科技有限公司
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