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Two-dimensional I-doped BiOIO3/g-C3N4 composite catalyst and preparation method and application thereof

A composite catalyst, g-c3n4 technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of limiting the photocatalytic performance of pure catalysts, narrow visible light response range, and low specific surface area. The effect of low cost of raw materials, promotion of photocatalytic activity, and simple preparation process

Active Publication Date: 2020-01-17
SUZHOU UNIV
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Problems solved by technology

Among the various current photocatalysts, g-C3N4 has been widely studied because of its unique planar structure, suitable bandgap (2.7eV), and metal-free catalyst; however, due to its low specific surface area, poor conductivity, and narrow visible light response range, Extremely fast photogenerated carrier recombination greatly limits its photocatalytic performance as a pure catalyst

Method used

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  • Two-dimensional I-doped BiOIO3/g-C3N4 composite catalyst and preparation method and application thereof
  • Two-dimensional I-doped BiOIO3/g-C3N4 composite catalyst and preparation method and application thereof
  • Two-dimensional I-doped BiOIO3/g-C3N4 composite catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Two-dimensional g-C 3 N 4 Preparation of nanosheets: First, add 10 g of urea into an aluminum crucible with a lid, put it into a muffle furnace, cover it, and calcinate at 550 °C for 4 h, with a heating rate of 2.5 °C min -1 (room temperature to 550 °C), after the muffle furnace was cooled to room temperature, a yellow solid was obtained; then the obtained yellow solid was spread in a rectangular crucible, and then calcined at 500 °C for 2 h, the heating rate was 5 °C min -1 (room temperature to 500°C), the light yellow product was collected, that is, the two-dimensional g-C 3 N 4 Nanosheets.

[0046] In order to observe the morphology of the material, the products prepared in this embodiment were characterized by scanning electron microscope and transmission electron microscope, with figure 1 is the two-dimensional g-C prepared in this example 3 N 4 SEM and TEM images of nanosheets, (a) and (d) are the g-C prepared in this example respectively 3 N 4 Nanosheets,...

Embodiment 2

[0048] First, 1.456 g Bi(NO 3 ) 3 ·5H 2 O and 0.5 g I 2 o 5 Dissolve in 30ml of deionized water, stir magnetically at room temperature for 15 minutes, then transfer to a 50ml reactor for hydrothermal reaction, the reaction temperature is 160°C, and the reaction time is 12 hours. When the system was naturally cooled to room temperature, the obtained white product was washed three times with water and ethanol respectively, and the product was collected by centrifugation, and then dried in an oven at 60 °C for 12 h to obtain BiOIO 3 Nanosheets, called BOI.

[0049] At room temperature, 0.5 g BiOIO was ultrasonically 3 Disperse evenly in 50 ml deionized water, then slowly drop 30 ml aqueous solution containing 0.1g KI into the above solution while continuing to stir, then keep stirring for 2 h, age for 1 h, centrifuge to collect the product, and the obtained light yellow The product was dried in an oven at 60 °C for 12 h to prepare I-doped BiOIO 3 Nanosheets, called IBOI. ...

Embodiment 3

[0052] I-doped BiOIO 3 / g -C 3 N 4 Preparation of nanocomposites: First, 0.03 g 2:1I doped BiOIO 3 Ultrasonic dispersion in 80 ml ethanol for 30 minutes, then 0.07 g g-C 3 N 4 Add it into the solution, then sonicate the mixture for 1 h, stir for 1 h, then transfer it to a 100ml reaction kettle and react at 160°C for 6 h, then centrifuge, wash the light yellow product collected by centrifugation with water and ethanol several times, and store it at 60°C Drying in an oven for 12 h prepared I-doped BiOIO 3 / g -C 3 N 4 (I-doped BiOIO 3 / g -C 3 N 4 The composite catalyst, simply labeled as 30% IBOI / CN) nanocomposite, was used for the following SEM and TEM tests. According to the addition of I-doped BiOIO 3 10% IBOI / CN, 30% IBOI / CN, and 50% IBOI / CN were prepared with different proportions, among which, I doped BiOIO in 30% IBOI / CN 3 The dosage is 0.03g, g-C 3 N 4 is 0.07 g.

[0053] In order to observe the morphology of the materials after compounding, the products pr...

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Abstract

The invention discloses a two-dimensional I-doped BiOIO3 / g-C3N4 composite catalyst and a preparation method and application thereof. Urea is used as a raw material to prepare g-C3N4 nano-sheets through calcination; a bismuth salt and an oxidized iodine salt are used as raw materials to prepare BiOIO3 nano-sheets through a hydrothermal reaction; then the BiOIO3 nano-sheets are reacted with an inorganic iodide salt to prepare I-doped BiOIO3 nano-sheets; the I-doped BiOIO3 nano-sheets and the g-C3N4 nano-sheets are subjected to a solvothermal reaction to prepare the two-dimensional I-doped BiOIO3 / g-C3N4 composite catalyst. The two-dimensional I-doped BiOIO3 / g-C3N4 composite photo-catalyst promotes the separation efficiency of photo-generated carriers in I-doped BiOIO3 and g-C3N4, and effectively increases the survival life of photo-generated charges, and thereby the photo-catalytic activity is promoted. At the same time, expensive metal elements in metal semiconductor materials are replaced, and thereby the preparation cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, in particular to a two-dimensional I-doped BiOIO 3 / g -C 3 N 4 A preparation method of a composite catalyst and its application to waste gas treatment. Background technique [0002] With the rapid development of industries all over the world, air pollution has become one of the most serious problems today. Exhaust gas will lead to photochemical pollution, acid rain, smog, etc., which will cause great harm to the human body, land, and water sources. Therefore, finding cheap, efficient and energy-saving methods to degrade and treat waste gas has become a hot issue in environmental research. At present, semiconductor photocatalytic technology has the advantages of non-toxicity, high degradation efficiency, and strong redox ability, and is considered to be one of the most economical and effective methods for treating exhaust pollution. Among the various current photocataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/38
CPCB01J27/24B01D53/8678B01J35/39Y02A50/20
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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