Preparation method of spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl)

A helical and nanowire technology, applied in the field of preparation of helical TiO2 nanowires, can solve the problems of reducing the speed of photocatalytic degradation of organic pollutants, affecting the scope of use, low quantum yield, etc., and achieving accelerated photocatalytic degradation of organic pollutants. process, fast catalytic degradation, and high catalytic efficiency

Inactive Publication Date: 2013-07-10
HOHAI UNIV
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  • Application Information

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Problems solved by technology

But this material also has some disadvantages that limit its wide application, one of which is TiO 2 The quantum yield is low, which will limit the exchange speed of its electrons and holes, ...

Method used

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  • Preparation method of spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl)
  • Preparation method of spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl)
  • Preparation method of spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A Helical TiO Doped with Ag / AgCl 2 Nanowires, prepared by:

[0030] (1) Take 0.03g of glutamic acid with 18 carbon chains (C 18-D- Glu), dissolved in a mixed solution of 13.6g of methanol and 80mL of water, at room temperature, the reaction time is 10min;

[0031] (2) Take 0.29g of titanium diisopropoxybisacetylacetonate, add the mixed solution obtained in step (1), and stir for 2 hours at 55°C;

[0032] (3) 10000r / min, centrifuge the mixture obtained in step (2) for 15min to obtain a colloid, and freeze-dry at -60°C for 12h to obtain a light yellow powder;

[0033] (4) At 550°C, calcinate the light yellow powder for 6 hours to obtain helical TiO 2 nanowires, the resulting schematic diagram is shown in figure 1 shown;

[0034] (5) Take 0.2g TiO 2 Mix the nanowires with 0.3g cetyltrimethylammonium chloride and 100mL water, and stir for 1h at room temperature;

[0035] (6) Add AgNO to the mixture obtained in step (5) 3 (2mL, 1.0M), stirred at room temperature for ...

Embodiment 2

[0040] Take 500mL of sewage with a 17β-estradiol concentration of 0.5mg / L, and put 0.25g of Ag / AgCl-doped helical TiO under the irradiation of a 24W fluorescent lamp. 2 The nanowires (prepared in Example 1), after 10 minutes, have a degradation rate of 99% for 17β-estradiol, while the degradation rate for common P25 is 20%. While ordinary helical TiO 2 It takes 80 minutes for nanowires to achieve a 99% degradation rate under the same conditions of light intensity and pollutant concentration. Therefore, it can be said that the helical TiO doped with Ag / AgCl 2 The nanowires significantly improved the removal of 17β-estradiol.

Embodiment 3

[0042] A Helical TiO Doped with Ag / AgCl 2 Nanowires, prepared by:

[0043] (1) Take 0.1mol of glutamic acid with eighteen carbon chains (C 18-D-Glu), dissolved in a mixed solution of 380mol methanol and 5596.2mol water, at room temperature, the reaction time is 15min;

[0044] (2) Take 0.5 mol of titanium diisopropoxybisacetylacetonate, add the mixture obtained in step (1), and stir for 2.5 hours at 56°C;

[0045] (3) 10000r / min, centrifuge the mixture obtained in step (2) for 15min to obtain a colloid, and freeze-dry at -60°C for 12h to obtain a light yellow powder;

[0046] (4) Calcining light yellow powder at 600°C for 8 hours to obtain helical TiO 2 Nanowires;

[0047] (5) Take 0.2g TiO 2 Mix the nanowires with 0.3g cetyltrimethylammonium chloride and 100mL water, and stir for 1.5h at room temperature;

[0048] (6) Add AgNO to the mixture obtained in step (5) 3 (2mL, 1.0M), stirred at room temperature for 1.5h, and then continued to stir for 1.5h under the irradiati...

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Abstract

The invention discloses a preparation method of a spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl). The preparation method comprises the following steps of 1) dissolving C18-D-Glu in a mixed solution of methanol and water; 2) adding isopropoxy diacetyl titanium acetone into the mixed solution, stirring for 2h at the temperature of 55 DEG C; 3) centrifugally separating the mixed solution to obtain colloid, and freeze-drying the colloid to obtain faint yellow powder; 4) calcinating the faint yellow powder at the temperature of 550 DEG C for 6h to obtain a spiral TiO2 nano wire; 5) mixing the spiral TiO2 nano wire, cetyl trimethylammonium chloride and water and stirring for 1h; 6) adding the silver nitrate (AgNO3) and stirring for 1h, and continuously stirring the mixture for 1h under the radiation of a 8W ultraviolet lamp; 7) centrifugally separating the mixture and drying at the temperature of 80 DEG C for 8h to obtain brown powder; and 8) calcinatinng the brown powder for 6h at the temperature of 300 DEG C to obtain the spiral TiO2 nano wire doped with the Ag/AgCl. Due to the adoption of the preparation method, the quantum yield of the TiO2 is greatly improved, and the process for photocatalytically degrading organic pollutants by utilizing TiO2 can be accelerated. Compared with the ordinary P25, the spiral titanium dioxide (TiO2) nano wire doped with silver/silver chloride (Ag/AgCl) has the advantage that the speed for degrading the pollutant with the same concentration can be improved by ten times; the catalysis efficiency under the visible light is high, and the catalytic degrading speed is high.

Description

technical field [0001] The present invention relates to TiO 2 The technical field of nanomaterials, in particular to a helical TiO doped with Ag / AgCl 2 Methods of preparing nanowires. Background technique [0002] Water is the basic element for the survival of human beings and all living things, and it is also an indispensable resource for safeguarding industry and agriculture and maintaining the health of natural ecology. The total amount of water resources remains unchanged in the natural cycle, but its water quality undergoes complex changes. Only when the water quality meets the necessary requirements can it become a usable water resource. With the increase of population, the development of industrial and agricultural production, and the increasingly serious pollution of water environment, the available water resources in many areas are in crisis one after another, seriously restricting the development of society and economy. The water crisis and its derived water qua...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y40/00B82Y30/00
Inventor 王大伟张文彬李轶王新瑞孙飞飞
Owner HOHAI UNIV
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