A kind of n, ti 3+ Co-doped visible-light photocatalytic tio 2 Preparation method of nanotube array

A nanotube array and visible light technology, applied in the field of nanomaterials, can solve problems such as non-reduction, and achieve the effects of simple process, saving of raw materials and equipment, and removal of refractory organic pollutants by strong visible light

Active Publication Date: 2017-12-12
YANGZHOU MINGSHENG NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method greatly improves the TiO 2 visible light photocatalytic performance, but considering its requirements for additional raw materials (hydrogen) and equipment, it is still not an economical method

Method used

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  • A kind of n, ti <sup>3+</sup> Co-doped visible-light photocatalytic tio <sub>2</sub> Preparation method of nanotube array
  • A kind of n, ti <sup>3+</sup> Co-doped visible-light photocatalytic tio <sub>2</sub> Preparation method of nanotube array
  • A kind of n, ti <sup>3+</sup> Co-doped visible-light photocatalytic tio <sub>2</sub> Preparation method of nanotube array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) After ultrasonically cleaning the pure titanium sheet with deionized water, immerse it in HF and HNO with a volume ratio of 1:3:6 3 、H 2 Etched in O mixed solution for 1 min, rinsed with deionized water immediately, and dried in nitrogen flow; weighed 0.37 g of NH 4 F is dissolved in a mixture of 90ml ethylene glycol and 10ml deionized water and configured as NH 4 F concentration is the electrolytic solution of 0.1mol / L; With the treated titanium sheet as the anode and the platinum sheet as the cathode, carry out the anodic oxidation reaction at 20V DC voltage for 0.5h, after the reaction is finished, wash with deionized water, and Dry in air to obtain amorphous TiO 2 nanotube arrays;

[0028] (2) the amorphous TiO 2 The nanotubes were suspended above 0.1g melamine, put into a muffle furnace and calcined at 450°C for 2h to crystallize and prepare N-doped TiO 2 After testing, its SEM image and EDS spectrum are as follows figure 1 shown in;

[0029] (3) With pl...

Embodiment 2

[0037] (1) After ultrasonically cleaning the pure titanium sheet with deionized water, immerse it in HF and HNO with a volume ratio of 1:3:6 3 、H 2 Etched in O mixed solution for 1min, rinsed with deionized water immediately, and dried in nitrogen flow; weighed 2.96g of NH 4 F is dissolved in a mixture of 90ml ethylene glycol and 10ml deionized water and configured as NH 4 Electrolyte with F concentration of 0.8mol / L; take the treated titanium sheet as anode and platinum sheet as cathode, and carry out anodic oxidation reaction at 35V DC voltage for 2h. After the reaction, wash with deionized water and dry in air dry in medium to obtain amorphous TiO 2 nanotube arrays;

[0038] (2) the amorphous TiO 2 The nanotubes were suspended above 0.7g melamine, put into a muffle furnace and calcined at 500°C for 2h to crystallize and prepare N-doped TiO 2 ;

[0039] (3) With platinum sheet as anode, crystallized TiO 2 The nanotube is the cathode, 2.5mol / L Na 2 SO 4 The solution ...

Embodiment 3

[0041] (1) After ultrasonically cleaning the pure titanium sheet with deionized water, immerse it in HF and HNO with a volume ratio of 1:3:6 3 、H 2 Etched in O mixed solution for 1min, rinsed with deionized water immediately, and dried in nitrogen flow; weighed 5.55g of NH 4 F is dissolved in a mixture of 90ml ethylene glycol and 10ml deionized water and configured as NH 4 Electrolyte with F concentration of 1.5mol / L; take the treated titanium sheet as anode and platinum sheet as cathode, and carry out anodic oxidation reaction at 50V DC voltage for 4h. dry in medium to obtain amorphous TiO 2 nanotube arrays;

[0042] (2) the amorphous TiO 2 The nanotubes were suspended above 1 g of melamine, and placed in a muffle furnace for calcination at 550 °C for 2 h to crystallize and prepare N-doped TiO 2 ;

[0043] (3) With platinum sheet as anode, crystallized TiO 2 Nanotube as cathode, 5mol / L Na 2 SO 4 The solution is an electrolyte, and an external -2V DC voltage is applie...

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Abstract

The invention relates to a preparation method of an N, Ti<3+> codoped visible light catalysis TiO2 nanotube array and belongs to the technical field of nanometer materials. The method comprises the following steps: growing a TiO2 nanotube on a titanium sheet by utilizing two electrode systems in a fluorine-containing electrolyte, then suspending the TiO2 nanotube above melamine for calcining in air at the temperature of 450-550 DEG C to obtain N-doped TiO2 nanotube (N-TiO2); and carrying out potentiostatic polarization on the array in inert electrolyte with negative potential to obtain N, Ti<3+> codoped modified visible light catalysis TiO2 nanotube array. By utilizing the preparation method, the Ti<3+> / N doped modified TiO2 nanotube array is successfully prepared. Compared with unmodified TiO2 nanotube array, the visible light response of the modified TiO2 nanotube array is obviously improved, and the strong capacity of removing persistent organic pollutant with strong visual light is shown. The preparation method is simple in process. By utilizing the preparation method, the photoelectric catalysis efficiency of TiO2 in visual light is improved so that the modified TiO2 nanotube array can be used in fields of environmental management, photovoltaic conversion, catalytic hydrogen production and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a visible light catalytic TiO 2 Preparation method of nanotube arrays. Background technique [0002] At present, the quality of tap water in my country is still relatively poor. More than 2,000 organic substances have been detected in tap water, including carcinogenic or suspected carcinogenic substances. Therefore, the research and development of new technologies for removing organic matter in tap water have received more and more attention. Due to TiO 2 Nanotube arrays have many advantages such as easy recycling and reusability, and the preparation of ordered TiO 2 Nanotube arrays are TiO 2 An important development direction in the research field of nanotube preparation. But due to TiO 2 The forbidden band (3.0 ~ 3.2eV) is wide, and only about 4% of solar energy can be used, and the recombination of photogenerated electrons and holes leads to low photon quantum effi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26B82Y40/00
Inventor 张延荣廖文娟
Owner YANGZHOU MINGSHENG NEW TECH
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