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CNX/TiO2 core-shell nanowire array and manufacture method thereof

A nanowire array, core-shell technology, applied in the field of photocatalysis, can solve the problems of ineffective use of visible light, high electron-hole recombination rate, short electron migration distance, etc. performance, the effect of promoting separation

Inactive Publication Date: 2019-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

with powdered TiO 2 Compared to 1D TiO 2 Nanowire arrays have the advantages of larger specific surface area, shorter electron migration distance, faster electron migration rate, and more reactive active sites, which can be used for photocatalytic reactions and are easy to recycle, but TiO 2 There are still some deficiencies in nanowire arrays: (1) TiO 2 The band gap is wide and can only be excited by ultraviolet light, and cannot effectively use visible light; (2) The electron-hole recombination rate is high, the quantum efficiency is low, and the activity is poor
However, currently reported TiO 2 / g -C 3 N 4 The electrode has problems such as narrow light absorption range (absorption band edge is only about 420nm), high electron-hole recombination rate and poor activity.

Method used

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  • CNX/TiO2 core-shell nanowire array and manufacture method thereof
  • CNX/TiO2 core-shell nanowire array and manufacture method thereof
  • CNX/TiO2 core-shell nanowire array and manufacture method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This embodiment provides a CN x / TiO 2 Core-shell nanowire array photocatalyst, its preparation method specifically comprises the following steps:

[0050] Step 1: Select a carbon cloth with a size of about 2cm×3cm as the growth substrate of titanium dioxide nanowires. The carbon cloth was ultrasonically cleaned in acetone, distilled water, and absolute ethanol in sequence. Add about 20mL n-hexane, 2 drops of TiCl to the beaker 4 , formulated into a uniform TiCl 4 hexane solution, and then add two pieces of carbon cloth to each beaker, take it out after soaking for 12 hours. After the carbon cloth was taken out, it was placed in a tube furnace. Under the air atmosphere, the heating rate was 3°C / min, from room temperature to 500°C. After a constant temperature of 30 minutes, the temperature was naturally lowered. It can be observed that the surface of the nanowire is covered with a thin layer of TiO 2 Seed layer;

[0051] Step 2: In a 200mL polytetrafluoroethylene...

Embodiment 2

[0055] Prepare a solution with methylene blue as the target pollutant to carry out an evaluation experiment on the photocatalytic degradation activity of the catalyst. The evaluation experiment is carried out in the following manner:

[0056] Will have CN x / TiO 2 The carbon cloth of the core-shell nanowire array was used as a photoanode, and the initial concentration of immersion was 1.5×10 - 5 In a mol / L methylene blue solution, a three-electrode system (PEC) is used to apply a bias voltage of 1.0V to the photoanode by connecting to an electrochemical workstation;

[0057] Before the start of the reaction, the adsorption was carried out under dark conditions, and the reaction was started after the adsorption equilibrium was reached.

[0058] A 300W Xe lamp is used as the light source, and a 420nm cut-off filter is installed on it, and the distance between the light source and the reaction liquid surface is 10cm; during the reaction time of 4 hours, sampling is performed e...

Embodiment 3

[0061] For the CN prepared in Example 1 x / TiO 2 The core-shell nanowire array is used as a photocatalyst for activity evaluation. The specific steps are similar to those in Example 2. The applied bias voltage is 2.0V, and the curve of photocatalytic degradation of methylene blue is obtained, as shown in Figure 5 shown. Depend on Figure 5 The results show that when the applied bias voltage is 2.0V, CN x / TiO 2 The photodegradation rate constant of the core-shell nanowire array is 0.01268min -1 , which is TiO in Comparative Example 1 below 2 1.4 times that of nanowire arrays. It can be seen that the CN provided by this embodiment x / TiO 2 The core-shell nanowire array photocatalyst has high photocatalytic activity, compared with pure TiO 2 Compared with nanowires, the degradation rate is significantly improved.

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Abstract

The invention provides a CNX / TiO2 core-shell nanowire array and a manufacture method thereof. The manufacture method comprises: soaking a conductive substrate in n-hexane solution of titanium tetrachloride, taking out the conductive substrate, and treating at a high temperature to obtain the substrate with a TiO2 seed layer; mixing well methylbenzene, tetrabutyl titanate, concentrated hydrochloricacid and titanium tetrachloride to obtain a liquid mixture; soaking the substrate with the TiO2 seed layer in the liquid mixture, carrying out hydrothermal reaction, cooling, washing with absolute ethyl alcohol, and treating at a high temperature to obtain the substrate with a TiO2 nanowire array; dissolving dicyandiamide and 4,5-dicyanoimidazole in water, drying by water bath evaporation, grinding into powder, mixing with the powder with the substrate with the TiO2 nanowire array, and treating at a high temperature to obtain the CNX / TiO2 core-shell nanowire array. The CNX / TiO2 core-shell nanowire array has good light-absorbing performance and photoelectric catalytic degradation, has a visible light absorbing range expansible to 550 nm and above, and can well photoelectrically catalyze methylene blue.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a CN x / TiO 2 Core-shell nanowire array and its preparation method. Background technique [0002] Since the 1970s and 1980s, with the rapid growth of the world's population and the rapid development of industry, it has brought serious water pollution problems, and the governance of the water environment has always been the focus of environmental governance in my country. Photocatalytic technology is a low-energy, green and environmentally friendly technology that can directly use solar energy to degrade pollutants. It has unique advantages in dealing with highly toxic, low-concentration, and refractory pollutants. [0003] TiO 2 Because of its non-toxic, cheap, high activity and stability, it has been widely studied and is currently the most widely used photocatalytic material. with powdered TiO 2 Compared to 1D TiO 2 Nanowire arrays have the advantages of larger spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10H01L31/0264B82Y30/00B82Y40/00C02F1/30C02F101/36C02F101/38
Inventor 王雅君姜桂元姜尧武巧焕刘萌萌李宇明徐春明赵震
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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