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Photocatalyst as well as preparation method and application method thereof

A photocatalyst and nanofiber technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of easy recombination of photogenerated electrons and holes, insufficient specific surface area, etc. Separation, improving optoelectronic properties, and convenient preparation

Inactive Publication Date: 2013-04-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The wide band gap can only absorb ultraviolet light, photogenerated electrons and holes are easy to recombine, and the specific surface area is not large enough, etc., which limits other practical applications.

Method used

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  • Photocatalyst as well as preparation method and application method thereof
  • Photocatalyst as well as preparation method and application method thereof
  • Photocatalyst as well as preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, CdS-ZnS / TiO of the present invention 2 Preparation of nanofibers

[0028] (1) Under magnetic stirring, add 1.5g tetraisopropyl titanate, 3mL ethanol and 3mL acetic acid to a 10mL beaker, stir magnetically for about 30min, then add PVP solution (0.45g PVP dissolved in 3mL ethanol), and continue stirring for 1h .Get TiO 2 Sol;

[0029] (2) Add the above sol into the syringe ( figure 1 ), the operating voltage is controlled to be 10kV, the distance between the receiver and the spinning needle is adjusted to be 10cm, and the outflow rate of the solution is 0.5mL / h. The solution in the tube is sprayed out stably, and the collecting plate is made of aluminum foil.

[0030] (3) The spun fibers were dried in a vacuum oven (120°C) for 12h, and then calcined at 450°C for 3h. Then naturally lowered to room temperature, TiO 2 Nanofibers.

[0031] (4) CdS-ZnS / TiO 2 Preparation of nanofibers

[0032] ① Put TiO 2 The nanofibers were impregnated with 0.2mol / L Zn(N...

Embodiment 2

[0035] TiO 2 Nanofibers, CdS / TiO 2 Nanofiber, ZnS-CdS / TiO 2 Nanofiber, CdS-ZnS / TiO 2 Nanofibers were tested for optoelectronic properties.

[0036] Implementation steps:

[0037] (1) CdS-ZnS / TiO fixed on ITO glass 2 Nanofibers are placed in 50mL KOH solution with a concentration of 1mol / L;

[0038] (2) Use a Xe lamp with a light source of 500W (100mW / cm 2 ), photoelectrochemical tests were carried out on it under visible light;

[0039] (3) The photoelectrochemical performance test was carried out on a standard three-electrode system electrochemical workstation (CHI600D, Shanghai Chenhua), in which the Pt electrode was used as the counter electrode, the saturated calomel electrode (SCE) was used as the reference electrode, and the CdS-ZnS / TiO 2 Nanofibers are working electrodes. The electrolyte is 0.1mol / L KOH.

[0040] (4) Control experiment on TiO 2 Nanofibers, CdS / TiO 2 Nanofiber, ZnS-CdS / TiO 2 On the nanofiber, the steps are the same as above.

[0041] image...

Embodiment 3

[0044] CdS-ZnS / TiO 2 Nanofiber Photocatalytic Degradation of Methylene Blue

[0045] The present invention adopts CdS / TiO 2 Nanofibers, CdS-ZnS / TiO 2 Nanofibers degrade 5mg / L methylene blue wastewater respectively.

[0046] Implementation steps:

[0047] (1) CdS-ZnS / TiO fixed on ITO glass 2 Nanofibers (the size of ITO glass is 1cm×4cm, the effective area is 1cm×3cm, a total of 3 pieces) were put into 50mL of methylene blue wastewater with a concentration of 5mg / L;

[0048] (2) Use a Xe lamp with a light source of 500W (100mW / cm 2 ), photocatalytic degradation of it under visible light;

[0049] (3) After regular sampling, use a UV-Vis spectrophotometer to monitor the change of methylene blue in the solution;

[0050] (4) Control experiment in CdS / TiO 2 On the nanofiber, the steps are the same as above, and the cycle is 3 times.

[0051] Figure 4 is CdS / TiO 2 Nanofibers and CdS-ZnS / TiO 2 Experimental diagram of three cycles of degradation of methylene blue solution...

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Abstract

The invention relates to a photocatalyst as well as a preparation method and an application method thereof. The preparation method comprises the following steps of: carrying out electrostatic spinning on TiO2 solution obtained by mixing tetraisopropyl titanate and PVP (Poly Vinyl Pyrrolidone) solution to obtain TiO2 nano fibers; immersing the TiO2 nano fibers into Zn(NO3)2 solution to flush and blow-drying the TiO2 nano fibers; then soaking, flushing and blow-drying the obtained TiO2 nano fibers in Na2S solution to obtain ZnS / TiO2 nano fibers; finally, immersing the ZnS / TiO2 nano fibers into Cd(NO3)2 solution and flushing and blow-drying the ZnS / TiO2 nano fibers; and soaking, flushing and blow-drying the obtained ZnS / TiO2 nano fibers in Na2S solution. According to the invention, the CdS-ZnS / TiO2 nano fibers with a one-dimensional structure are synthesized by adopting an electrostatic spinning technology and the successive ionic layer adsorption and reaction (SILAR) method for the first time. CdS is a narrow-band semiconductor material and ZnS can improve stability of the CdS, and thus, the TiO2 nano fibers subjected to modification of CdS and ZnS not only can widen the adsorption range in a visible region, but also can utilize the SILAR to obtain a CdS-ZnS / TiO2 composite material, better utilizes a visible light source, accelerates effective separation of a photon-generated carrier and improves photovoltaic conversion efficiency.

Description

technical field [0001] The invention relates to a novel functional nanomaterial with excellent photoelectric properties——CdS-ZnS / TiO 2 Nanofiber and its preparation method and application. Background technique [0002] One-dimensional nanomaterials are a new type of functional materials developed in recent years, and have attracted more and more attention because of their unique electrical, optical, magnetic, mechanical and other properties. There are many methods for preparing nanomaterials, such as etching technology, hydrothermal method, template method, electrospinning method, etc. Among them, the electrospinning method is a spinning technology different from the conventional method. It is to add a high-voltage electrostatic field of several thousand to tens of thousands of volts to the polymer solution or melt, so that the polymer solution or melt first Taylor conical droplets are formed at the jet orifice. When the electric field stretching force generated by the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/06C02F1/30
Inventor 罗胜联李玥刘承斌韦振栋孟德水丁明月
Owner HUNAN UNIV
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