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A method for preparing plasma composite photocatalyst

A plasma and composite light technology, applied in the field of alkaline earth metal potassium tantalate, to achieve the effects of complete crystallization, regular morphology and good dispersibility

Active Publication Date: 2018-06-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Alkaline earth metal potassium tantalate (KTaO 3 ) conduction band consists of Ta5d orbitals, which are much higher than Ti3d orbitals, so it is similar to titanium dioxide (TiO 2 ) compared with photoexcited potassium tantalate, the electrons generated have stronger reducing power, which is more conducive to the efficient photocatalytic decomposition of organic matter; currently, Gregory et al. (J. Mater. Res., Vol. 17, No. 11, Nov 2002) studied the morphology changes of potassium tantalate synthesized by hydrothermal method under different time and temperature, different ratios of potassium hydroxide and tantalum pentoxide, and finally prepared cubic potassium tantalate, but only Response under ultraviolet light; however, in the solar spectrum, the ultraviolet light is less than 5%, and the visible light region is more than 50%. Therefore, some researchers use Ag / AgCl loaded on the surface of nano-semiconductor compounds to construct composites with plasmon resonance effects. system; this system has the effect of efficiently utilizing visible light. Jiaguo Yu et al. (J. Phys. Chem. C 2009, 113, 16394–16401) prepared Ag / AgCl supported on the surface of titanium dioxide nanotube arrays, Sara Naghizadeh-Alamdari. et al. (Solid State Sciences 2015, 40, 111-120) prepared Ag / AgCl loaded on the surface of ZnO. This kind of composite photocatalyst using plasmon is widely used. However, the construction of Ag / AgCl loaded on the surface of nano-potassium tantalate has no apps yet

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  • A method for preparing plasma composite photocatalyst
  • A method for preparing plasma composite photocatalyst
  • A method for preparing plasma composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Ag / AgCl / KTaO 3 Preparation of Plasmonic Nanocomposite Photocatalysts

[0016] Add 400 mg of nano-potassium tantalate to 25 mL of silver nitrate solution containing 4.8, 6.4, 8.0 and 9.6 mg / L respectively, stir magnetically, then add excess hydrochloric acid, continue stirring for 2 hours, and then place it under a 300 W xenon lamp After irradiating for 20 minutes, after the reaction, the obtained product was washed with deionized water, filtered, and dried in a constant temperature drying oven at 60°C.

Embodiment 2

[0017] Example 2 Ag / AgCl / KTaO 3 Characterization and analysis of plasmonic nanocomposite photocatalysts

[0018] Such as figure 1 As shown, it can be seen from the figure that with the increase of the amount of Ag / AgCl, the peaks of AgCl and Ag gradually appeared, indicating that we successfully prepared Ag / AgCl / KTaO 3 Plasmonic nanocomposite photocatalysts.

[0019] Such as figure 2 As shown, pure KTaO can be seen in (A) 3 For nanoblocks, the presence of Ag and AgCl nanoparticles can be seen in (B).

[0020] Such as image 3 As shown, the spectrum shows the presence of silver, chlorine, tantalum, potassium, and oxygen elements.

Embodiment 3

[0021] Example 3 Ag / AgCl / KTaO 3 Visible light catalytic activity experiments of plasmonic nanocomposite photocatalysts

[0022] (1) Prepare a methyl orange solution with a concentration of 10 mg / L, and place the prepared solution in a dark place.

[0023] (2) Weigh Ag / AgCl / KTaO 3 Put 0.1 g of the plasma nanocomposite photocatalyst into the photocatalytic reactor respectively, add 100 mL of the target degradation solution prepared in step (1), and stir magnetically for 30 min. After the composite photocatalyst is uniformly dispersed, turn on the water source and light source. Photocatalytic degradation experiments were carried out.

[0024] (3) Draw up the photocatalytic degradation solution in the reactor every 10 minutes, centrifuge and use it for the measurement of UV-Vis absorbance.

[0025] (4) by Figure 4 It can be seen that the prepared nanocomposite photocatalysts have excellent visible light catalytic activity, especially Ag / AgCl and KTaO 3 The mass ratio of the ...

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Abstract

The invention relates to alkaline-earth metal potassium tantalite, and particularly relates to a method for preparing an Ag / AgCl / KTaO3 plasma composite photo-catalyst by using hydrochloric acid, silver nitrate and potassium tantalite as raw materials. According to the method, firstly, the potassium tantalite is added into a silver nitrate solution, excessive hydrochloric acid is added while stirring, stirring is performed for 2 hours, and then irradiation is performed for 20 minutes under a 300w xenon lamp. After reacting, a final product is obtained through filtering, washing and drying. Tests prove that through degrading methyl orange (MO) under visible light, the prepared composite photo-catalyst has good photocatalytic activity.

Description

technical field [0001] The present invention relates to alkaline earth metal potassium tantalate, in particular to a kind of preparation of Ag / AgCl / KTaO with hydrochloric acid, silver nitrate and potassium tantalate as raw materials. 3 A method for plasma composite photocatalyst, especially a method for preparing a nanocomposite photocatalyst with simple preparation process and good visible light catalytic activity. technical background [0002] Alkaline earth metal potassium tantalate (KTaO 3 ) conduction band consists of Ta5d orbitals, which are much higher than Ti3d orbitals, so it is similar to titanium dioxide (TiO 2 ) compared with photoexcited potassium tantalate, the electrons generated have stronger reducing power, which is more conducive to the efficient photocatalytic decomposition of organic matter; currently, Gregory et al. (J. Mater. Res., Vol. 17, No. 11, Nov 2002) studied the morphology changes of potassium tantalate synthesized by hydrothermal method under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/10C02F1/30C02F101/38
Inventor 施伟东徐东波陈必义延旭李春发陈超
Owner JIANGSU UNIV
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