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Ag/AgCl/TiO* nanotube array plasma visible-light photocatalyst and preparation method thereof

A nanotube array, photocatalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve problems such as hindering the promotion and application of photocatalytic materials

Inactive Publication Date: 2009-09-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since anatase has a forbidden band width of 3.2eV, it only responds to ultraviolet light with a wavelength less than 387.5nm, but ultraviolet light only accounts for 4% of sunlight, which seriously hinders TiO 2 Promotion and application of photocatalytic materials

Method used

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  • Ag/AgCl/TiO* nanotube array plasma visible-light photocatalyst and preparation method thereof
  • Ag/AgCl/TiO* nanotube array plasma visible-light photocatalyst and preparation method thereof
  • Ag/AgCl/TiO* nanotube array plasma visible-light photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] For the preparation of visible light active Ag / AgCl / TiO 2 Nanotube array plasmonic photocatalyst, the titanium sheet should be anodized first to generate amorphous TiO on the surface 2 array, and then the amorphous TiO 2 Calcination transforms to anatase, and then in the anatase phase TiO 2 Ag / AgCl particles are deposited on the walls of the arrayed nanotubes. The detailed experimental process is as follows: In a 250 ml polytetrafluoroethylene beaker, prepare 150 ml of electrolyte solution with a concentration of 0.5 mol / liter of phosphoric acid and 0.14 mol / liter of sodium fluoride, with the platinum sheet as the cathode and the titanium sheet as Anode, anodized at a voltage of 20V for 1 hour, and amorphous TiO was formed on the surface of the titanium sheet 2 array of nanotubes. Amorphous TiO 2 The nanotube array is placed in a muffle furnace and calcined at 450°C for 2 hours, and the amorphous state is transformed into anatase. anatase phase TiO 2 Nanotube arr...

Embodiment 2

[0050] In order to prove that nano silver, AgCl and TiO 2 array on Ag / AgCl / TiO 2 Synergy and Ag / AgCl / TiO in plasmonic photocatalysts 2 The visible light plasmonic photocatalytic mechanism of different nanotube arrays was compared (see Table 1). The results showed that TiO alone 2 Array, AgCl / TiO 2 Arrays without visible light photocatalytic activity, Ag / TiO 2 The array has weak activity at the beginning of visible light irradiation, and the activity gradually disappears with the increase of irradiation time, while the Ag / AgCl / TiO 2 The array has strong visible light photocatalytic activity. This shows that Ag / AgCl / TiO 2 The activity of plasmonic photocatalyst is nano-silver, AgCl and TiO 2 The result of array synergy. Ag / TiO 2 It is active at the beginning of illumination because of the plasmonic visible light absorption effect of nano-silver. Under the excitation of visible light, nano-silver generates electron-hole pairs, resulting in photocatalytic activity. Since ...

Embodiment 3

[0052] In order to test the effect of HCl concentration on the photocatalytic activity of the sample, in addition to the different HCl concentrations, other reaction conditions such as: anodic oxidation voltage (20V), oxidation time (1 hour), calcination temperature (450 ° C), calcination time (2 hours) , AgNO 3 Concentration (0.1 mol / liter) etc. are all identical with embodiment 1. The results show that when the concentration of HCl is in the range of 0.5-2 mol / L, the prepared Ag / AgCl / TiO 2 Nanotube arrays have good photocatalytic activity. In experiments, it was found that the optimum HCl concentration was 0.8-1.2 mol / liter.

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Abstract

The invention discloses an Ag / AgCl / TiO2 nanotube array plasma visible-light photocatalyst and a preparation method thereof. Aperture, tube wall thickness, and tube length of a TiO2 nanotube in the photocatalyst are 90-120nm, 10-20nm, and 500-600nm respectively, particle size of Ag / AgCl inside the TiO2 nanotube is 10-30nm. The preparation method comprises the following steps: first anodizing a metallic titanium sheet in sodium fluoride and phosphoric acid solution, generating a TiO2 nanotube array of amorphous state on the titanium sheet surface, and then converting an amorphous phase into an anatase phase by calcining the TiO2 nanotube array. Then soaking the anatase TiO2 nanotube array in HC1 and AgNO3 solution sequentially so that the AgC1 nano-particles can deposit on tube walls of the TiO2 nanotubes, thus generating a AgC1 / TiO2 nanotube array, and then irradiating the AgC1 / TiO2 nanotube array with UV light to reduce partial Ag<+> on surface of AgC1 particles to metallic silver to obtain the Ag / AgCl / TiO2 nanotube array. The photocatalyst has high visible light photocatalytic activity. The method has low preparation cost, is environmentally friendly, and has simple operations. The method can be also used to prepare other Ag / silver halide / TiO2 nanotube array plasma photocatalysts.

Description

technical field [0001] The present invention relates to visible light active Ag / silver halide / TiO 2 Nanotube array plasmonic photocatalysts and methods for their preparation, specifically relating to visible light active Ag / AgCl / TiO 2 Nanotube array plasmonic photocatalyst and preparation method thereof. technical background [0002] In recent years, TiO prepared by electrochemical anodic oxidation on Ti substrate 2 Nanotube arrays have the advantages of high specific surface area, controllable nanotube size, and high bonding strength between the array layer and the substrate, and have a variety of potential applications, such as gas sensing devices, photocatalytic water splitting hydrogen production materials, photocatalysts, solar cells and Biological materials, etc., so the preparation of TiO by anodic oxidation 2 Nanotube arrays have attracted much attention. [0003] Titanium dioxide is one of the best photocatalysts widely used in environmental treatment because of...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/50B01J27/10B01J37/03B01J37/16A62D3/10G01N21/64A62D101/28
Inventor 余家国戴高鹏程蓓
Owner WUHAN UNIV OF TECH
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