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Preparation method of sulfur-doped titanium dioxide photocatalyst

A titanium dioxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of uniform particle size, improved photocatalytic activity, and improved degradation efficiency

Active Publication Date: 2020-05-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, titanium dioxide particles are also refined by sol-gel method, direct precipitation method, microemulsion method and other methods to increase the specific surface area of ​​the material, but most of these methods require calcination at high temperature, and the existing preparation Most of the methods are to first complete the preparation of titanium dioxide, and then carry out two-step preparation processes such as loading and doping of the prepared titanium dioxide.

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  • Preparation method of sulfur-doped titanium dioxide photocatalyst
  • Preparation method of sulfur-doped titanium dioxide photocatalyst
  • Preparation method of sulfur-doped titanium dioxide photocatalyst

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preparation example Construction

[0027] The specific steps of the preparation method of sulfur-doped titanium dioxide photocatalyst of the present invention are:

[0028] Step 1: Weigh the raw materials of pure Cu and pure Ti according to the designed atomic ratio, mix them evenly, and prepare Cu by smelting and spin quenching. x Ti y Amorphous alloy thin strip;

[0029] Step 2: Configure ammonium persulfate to a concentration of 0.5-2mol L -1 solution, add NaOH to the prepared solution, wherein the NaOH content is 0.1-1mol L -1 ; Transfer the amorphous strips obtained in step 1 and the configured ammonium persulfate solution to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 120-180° C. for 10-30 hours.

[0030] Step 3: The obtained Cu after hydrothermal reaction x Ti y The amorphous alloy thin strips are taken out, soaked and cleaned with deionized water and alcohol repeatedly in turn, and after drying, the strips are ground into powder by grinding, sulfur-doped titanium dioxide ...

Embodiment 1

[0040] According to Cu 70 Ti 30 The target composition is to take Cu and Ti metal element raw materials with a purity of 99.9%, and prepare Cu by vacuum arc melting and vacuum stripping 70 Ti 30 Amorphous alloy strips, the XRD results are as follows figure 1 , indicating that the as-prepared strips are amorphous.

[0041] Use deionized water to configure ammonium persulfate to a concentration of 2mol L -1 solution, during the configuration process, add sodium hydroxide, the concentration is 0.5mol L -1 .

[0042] Mix 25ml of configured ammonium persulfate solution with 200mg of prepared Cu 70 Ti 30 The amorphous alloy strips were transferred to a hydrothermal reaction kettle for 20 hours of hydrothermal reaction at 150°C, and cooled with the furnace after the reaction was completed.

[0043] The cooled strips were taken out of the solution, soaked and washed with deionized water and absolute ethanol repeatedly, and dried in a drying oven at 45°C for 1 hour to obtain th...

Embodiment 2

[0046] According to Cu 70 Ti 30 The target composition is to take Cu and Ti metal element raw materials with a purity of 99.9%, and prepare Cu by vacuum arc melting and vacuum stripping 70 Ti 30 Amorphous alloy strips.

[0047] Use deionized water to configure ammonium persulfate to a concentration of 0.5mol L -1 solution, during the configuration process, add sodium hydroxide, the concentration is 0.5mol L -1 .

[0048] Mix 25ml of configured ammonium persulfate solution with 200mg of prepared Cu 70 Ti 30 The amorphous alloy strips were transferred to a hydrothermal reaction kettle for 20 hours of hydrothermal reaction at 150°C, and cooled with the furnace after the reaction was completed.

[0049] The cooled strips were taken out of the solution, soaked and washed with deionized water and absolute ethanol repeatedly in sequence, and dried in a drying oven at 45° C. for 1 hour to obtain dried strips.

[0050] The dried strips were ground into powder and heat-treated i...

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Abstract

The invention provides a preparation method of a sulfur-doped titanium dioxide photocatalyst, which takes a copper-titanium amorphous alloy as a precursor and comprises the following steps: A, preparing an amorphous alloy strip from pure metals Cu and Ti according to an atomic ratio as a precursor for subsequent preparation of titanium dioxide through selective corrosion reaction; B, preparing ammonium persulfate into a 0.5-2 mol L<-1> solution, and adding NaOH (the content is 0.1-1 mol L<-1>) into the prepared solution; C, transferring the amorphous strip and the prepared solution into a hydrothermal reaction kettle, performing reacting at 120-180 DEG C for 10-30 hours, washing the obtained product with deionized water, washing the wobtained product ith absolute ethyl alcohol, and performing drying; and D, grinding the dried sample into powder, and carrying out heat treatment under different conditions to obtain the photocatalyst material. By means of the method, the copper-titanium amorphous alloy strip can be effectively prepared into sulfur-doped anatase type titanium dioxide, sulfur element doping is achieved, the forbidden band width of the material is reduced, the light utilization rate is increased, and the photocatalytic performance of the material is improved.

Description

technical field [0001] The invention belongs to the field of preparation and synthesis of photocatalytic materials, and specifically designs a preparation method of sulfur-doped titanium dioxide photocatalyst. Background technique [0002] Water resources occupy an extremely important position in our daily life, and with the continuous advancement of industrialization, the problem of water pollution control has become increasingly severe. Because metal oxides have shown good performance in catalytic degradation and treatment of wastewater, such as strong adsorption capacity, high catalytic activity, good chemical stability, and low price, they have obvious advantages in sewage treatment. Removing pollutants through catalytic technology can not only treat toxic substances that are difficult to degrade by biological methods, but also completely degrade organic pollutants and mineralize them into H 2 O.CO 2 and other inorganic small molecule substances, avoiding secondary pol...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/02
CPCB01J27/043B01J35/50B01J35/39
Inventor 潘冶张恩铭陆韬
Owner SOUTHEAST UNIV