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Composite photoelectric catalyst as well as preparation and applications

A catalyst and photoelectric technology, applied in the field of composite photocatalysts, can solve the problems of low solar energy utilization rate, high recombination rate, and low photocatalytic efficiency, and achieve the effects of improving photocatalytic efficiency, low cost, and simple preparation method

Inactive Publication Date: 2012-01-11
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the recombination rate of photogenerated electrons and holes in the intrinsic state of titanium dioxide is high, resulting in low photocatalytic efficiency, and can only absorb ultraviolet light (below 400nm), and the utilization rate of solar energy is low.

Method used

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  • Composite photoelectric catalyst as well as preparation and applications
  • Composite photoelectric catalyst as well as preparation and applications
  • Composite photoelectric catalyst as well as preparation and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of titania nanotube arrays

[0025] ① Grind the surface of the base material titanium sheet, clean it and set aside;

[0026] ② Preparation of inorganic electrolyte: the electrolyte is composed of 0.1M NaF and 0.5M NaHSO 4 The composition of the aqueous solution;

[0027] ③Under the condition of 15V DC voltage, using pure titanium sheet as the anode and platinum sheet as the cathode, the titanium dioxide nanotube array is electrolyzed in the electrolyte;

[0028] ④The titania nanotube array prepared above was calcined under aerobic conditions at 500°C for 3 hours to crystallize it into a titania nanotube array. see figure 1 .

[0029] (2) Preparation of graphene (RGO) film:

[0030] ① Preparation of graphene oxide aqueous dispersion: graphene oxide dispersed Na 2 HPO 4 -KH 2 PO 4 In the buffer solution, sonicate for 30 minutes and set aside;

[0031] ②Using the titanium dioxide nanotube array electrode as the working electrode, the platinum ele...

Embodiment 2

[0041] (1)CuInS 2 / RGO-TiO 2 Fabrication of Composite Nanotube Arrays

[0042] The RGO-TiO prepared in Example 1 2 Nanotube array in 20ml containing CuCl 2 (2mmol), InCl 3 (2mmol) and Na 2 S 2 o 3 (20mmol) solution, in standard three-electrode system, in TiO 2 Electrodeposition of CuInS on the nanotube array (relative to the saturated calomel electrode, the energization voltage is -2.5V, the pulse time on-off ratio is 0.5 seconds: 1 second) 2 / RGO-TiO 2 Composite nanotube arrays. see Figure 4 .

[0043] (2)CuInS 2 / RGO-TiO 2 Photocatalytic degradation of methylene blue and 2,4-dichlorophenoxyacetic acid by composite materials

[0044] CdS / RGO-TiO in embodiment 1 2 Replaced by CuInS 2 / RGO-TiO 2 , the rest are the same as in Example 1, the degradation efficiency of methylene blue is 98%, and the degradation efficiency of 2,4-dichlorophenoxyacetic acid is 97%.

Embodiment 3

[0046] (1) WO 3 / RGO-TiO 2 Fabrication of Composite Nanotube Arrays

[0047] At 30°C, slowly add 1g of tungsten powder into 20mL of 30% H 2 o 2 , stirred for 2 hours, the black tungsten powder was almost completely covered by H 2 o 2 Oxidative dissolution, only a small amount of white precipitate of insoluble oxides of W, and clear peroxytungstic acid sol was obtained after sol filtration. Add 20 mL of absolute ethanol to the sol to consume unreacted H 2 o 2 And makes the sol band negatively charged. The RGO-TiO prepared in Example 1 2 The nanotube array was immersed in the above sol for 2 hours, and then aerobically calcined at 400°C for 5 hours to obtain WO 3 / RGO-TiO 2 Composite nanotube arrays. see Figure 5 .

[0048] (2) WO 3 / RGO-TiO 2 Photocatalytic degradation of methylene blue and 2,4-dichlorophenoxyacetic acid by composite materials

[0049] CdS / RGO-TiO in embodiment 1 2 replace with WO 3 / RGO-TiO 2 , the rest are the same as in Example 1, the deg...

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Abstract

The invention discloses a composite photoelectric catalyst as well as preparation and applications. A graphene thin film layer is deposited on the outer surface of a titanium oxide nanotube array and the opening of a nanotube array, and semiconductor nanoparticles are deposited on the surface of the graphene thin film layer and the inner surface of the nanotubes of the titanium oxide nanotube array. The catalyst has an excellent performance in the aspect of treating water pollutants.

Description

Technical field: [0001] The invention relates to a composite photocatalyst which can be used for organic waste water treatment and its preparation and application. Background technique: [0002] Titanium dioxide has become the most promising semiconductor photocatalyst due to its stable chemical properties, non-toxicity, low cost and high catalytic activity. As we all know, the recombination rate of photogenerated electrons and holes in the intrinsic state of titanium dioxide is high, resulting in low photocatalytic efficiency, and can only absorb ultraviolet light (below 400nm), and the utilization rate of solar energy is low. Invention content: [0003] The object of the present invention aims to provide a kind of composite photocatalyst and application, can fully utilize solar energy in the visible region, to organic pollutants (such as herbicide 2,4-dichlorophenoxyacetic acid, dyestuff) such as aromatic hydrocarbon in organic waste water The photocatalytic or photoele...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J27/057B01J23/30B01J23/745B01J23/18B01J37/34B82Y30/00B82Y40/00C02F1/30C02F1/46
CPCY02W10/37
Inventor 罗胜联刘承斌滕雅蓉唐艳红张甘张锡林
Owner HUNAN UNIV
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