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Composite photocatalyst SiO2/CNI, preparation method therefor and application in field of hydrogen production by water photolysis

A catalyst and compound light technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problems of low hydrogen content, high raw material cost, limited increase in photocatalytic efficiency of modified catalysts, etc.

Inactive Publication Date: 2016-03-30
FUYANG NORMAL UNIVERSITY
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  • Description
  • Claims
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Problems solved by technology

Among the many new energy sources, hydrogen has attracted much attention because of its non-pollution and the reaction product is water, but the content of hydrogen in nature is extremely low, so it is difficult to obtain enough hydrogen resources from nature for utilization, and the existing technology The method for preparing hydrogen in China is mainly electrolysis, which consumes a large amount of energy when preparing hydrogen, and will cause pollution. Therefore, it is urgent to develop a method for preparing hydrogen that is simple, pollution-free and low-energy.
[0005] However, the above-mentioned preparation method is not only complicated in operation and high in cost of raw materials, but also the degree of increase in the photocatalytic efficiency of the modified catalyst is limited, which cannot meet the industrial requirements. Moreover, the above-mentioned photocatalyst cannot be applied to photocatalytic degradation of water to produce hydrogen

Method used

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  • Composite photocatalyst SiO2/CNI, preparation method therefor and application in field of hydrogen production by water photolysis
  • Composite photocatalyst SiO2/CNI, preparation method therefor and application in field of hydrogen production by water photolysis
  • Composite photocatalyst SiO2/CNI, preparation method therefor and application in field of hydrogen production by water photolysis

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experiment example 5

[0046] The inventors have found through research that SiO 2 The carrier has the characteristics of surface dispersion effect, large specific surface area and porous structure. When SiO 2 Carbon nitride with graphite phase (g-C 3 N 4 ) after recombination to form a binary semiconductor composite photocatalyst, its photocatalytic activity is significantly improved, and is not bound by any theory. The stages can be transferred and separated, thereby prolonging the life of the carriers, thereby improving the photocatalytic reactivity.

[0047] According to a third aspect of the present invention, there is provided a method for preparing the above-mentioned composite photocatalyst SiO 2 The method of / CNI is characterized in that, the method comprises the following steps:

[0048] Step 1, mixing the nitrogen-containing organic matter with the iodine-containing compound, calcining, optionally cooling, and then purifying to obtain a CNI sample.

[0049] In the present invention, ...

Embodiment 1

[0094] (1) Accurately weigh 2.0g of dicyandiamide and 1.0g of ammonium iodide in a small beaker (ammonium iodide should be weighed in the dark), add 10ml of deionized water, and place the small beaker in a water bath at 80°C Evaporate to dryness in a water bath at 80°C for 6 hours; put the obtained sample into an agate mortar and grind it finely, then put it in a crucible and place it in a box-type resistance furnace for calcination at 550°C for 4 hours, then take it out, cool the obtained sample to room temperature, and grind Finely pack into the sample bag to prepare the CNI catalyst as it is;

[0095] The obtained CNI was transferred as it was to a small beaker filled with 80 mL of distilled water, then washed with water, acid washed (HCl, 1mol / L), alkali washed (NaOH, 1mol / L), washed with water again, and suction filtered to remove all unreacted harmful Surface substance: Put the treated sample in an oven at 80°C and dry for 5 hours. After the drying is completed, grind th...

Embodiment 2～4

[0098] The method used in embodiment 2~4 is similar to embodiment 1, difference is only in step (2) SiO 2 The weights are 0.2000g, 0.1200g and 0.1000g respectively, and the composite catalysts prepared are SiO 2 / CNI(1:15), SiO2 2 / CNI(1:25), SiO2 2 / CNI (1:30).

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Abstract

The present invention provides a composite photocatalyst and a preparation method and an application thereof. The composite photocatalyst can catalytically decompose water under a visible light condition so as to prepare hydrogen, and provides a new approach to develop and utilize new energy sources. The composite photocatalyst is prepared by using a nitrogen-containing organic compound and an iodine-containing compound as raw materials, by calcining the raw materials to obtain iodine doped carbon nitride (CNI), and by compounding the obtained CNI with silicon dioxide. The preparation method is simple and feasible, and has excellent operability.

Description

technical field [0001] The invention relates to a photocatalyst and its preparation method and application, in particular to photocatalyst SiO 2 / CNI and its preparation method and application. Background technique [0002] Graphite phase carbon nitride, because of its high photocatalytic activity, good stability, cheap raw material price, especially the outstanding advantages of no metal, makes it a new type of photocatalytic material, however, the single-phase g-C 3 N 4 Catalysts usually have unsatisfactory photocatalytic performance due to low quantum efficiency. In addition, g-C 3 N 4 The high photogenerated electron-hole recombination rate of the material leads to low catalytic efficiency, which limits its application in photocatalysis. [0003] To improve g-C 3 N 4 In recent years, many modification methods have been studied. One is to use non-metallic elements to g-C 3 N 4 To modify, the non-metallic elements include S, N, C, B, F, P, etc. It is generally be...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCY02E60/36
Inventor 李慧泉崔玉民苗慧陶栋梁
Owner FUYANG NORMAL UNIVERSITY
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