Metal ion-doped titanium dioxide plate-type photocatalytic microreactor and preparation method for catalyst thin films in reactor

A technology of metal ions and titanium dioxide, applied in the field of photocatalysis, can solve problems such as difficult engineering problems, low processing capacity of a single microchannel, inconsistent surface in the propagation direction, etc., and achieve low cost, increase raw material processing capacity, and simple parallel amplification Effect

Active Publication Date: 2014-11-19
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both Chinese patents 200910197401.X and 201010148412.1 use circular microchannels as the reaction area, which not only has a small light receiving area, low processing capacity of a single microchannel, but also makes parallel amplification difficult, and engineering problems are difficult to solve, etc.
Chinese patent 201210051512.1 provides a way of parallel amplification, but there is a limit to the effective propagation distance of light when the optical fiber is used as the channel of light (AIChEJ.2006,52(6):2271-2280), the direction of light propagation and the need to be illuminated Inconsistency of the surface of the catalyst and other problems, while the reactor is operated intermittently

Method used

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  • Metal ion-doped titanium dioxide plate-type photocatalytic microreactor and preparation method for catalyst thin films in reactor
  • Metal ion-doped titanium dioxide plate-type photocatalytic microreactor and preparation method for catalyst thin films in reactor
  • Metal ion-doped titanium dioxide plate-type photocatalytic microreactor and preparation method for catalyst thin films in reactor

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preparation example Construction

[0047] The present invention has the preparation method of catalyst thin film in the titania plate type photocatalytic microreactor of metal ion doping, and it comprises the following steps:

[0048] Step 1: Prepare the sol-gel solution, the specific steps are:

[0049] (a) Add butyl titanate, absolute ethanol and diethanolamine in sequence in the reactor, and electromagnetically stir until the mixture reaches a clear and transparent state, wherein the molar ratio of butyl titanate, absolute ethanol and diethanolamine is 1: (4-6):(1-8);

[0050] (b) add absolute ethanol, distilled water and metal soluble salt in the container successively to completely dissolve the metal soluble salt to form a metal soluble salt solution, wherein absolute ethanol, distilled water and metal soluble salt are added with butyl titanate in step (a) The molar ratio of amount is (2-4):(1-10):(0.0001-0.005):1; The preferred metal ion of doping is La 3+ 、Cu 2+ , Mn 2+ , Fe 3+ , Zn 2+ or Ni 2+ On...

Embodiment 1

[0056] In the first step, a single-channel groove reaction area is formed on a stainless steel plate by chemical etching. The width of the groove is 15 mm, and the depth is 300 μm. An inlet 1 and an outlet 2 respectively connected to the inlet and outlet of the single-channel reaction area are opened on the stainless steel plate base;

[0057] In the second step, TiO doped with metal ions was prepared by sol-gel method 2 Sol-gel.

[0058] (a) Add butyl titanate, absolute ethanol and diethanolamine in sequence in the reactor, and electromagnetically stir until the mixture reaches a clear and transparent state, wherein the molar ratio of butyl titanate, absolute ethanol and diethanolamine is 1: 4:5;

[0059](b) add absolute ethanol, distilled water and metal soluble salt in the container successively, make metal soluble salt dissolve completely and form metal soluble salt solution, wherein absolute alcohol, distilled water and metal soluble salt are mixed with butyl titanate i...

Embodiment 2

[0069] Preparation of the single channel reactor of the present invention:

[0070] In the first step, a single-channel grooved reaction area is formed on a stainless steel plate by electrocorrosion. The width of the groove is 20 mm, and the depth is 250 μm. On the base of the stainless steel plate, an inlet 1 and an outlet 2 respectively connected with the inlet and outlet of the single-channel reaction area are opened, the area of ​​the channel wall, the area of ​​the inner bottom of the channel, and the area of ​​the catalyst. Coating area, reaction volume, and specific surface area parameters are as follows: 26mm 2 , 727mm 2 , 753mm 2 , 0.15mL, 5.18mm 2 / mm 3 ;

[0071] In the second step, Cu 2+ Doped TiO 2 Sol-gel.

[0072] (a) Add butyl titanate, absolute ethanol and diethanolamine in sequence in the reactor, and electromagnetically stir until the mixture reaches a clear and transparent state, wherein the molar ratio of butyl titanate, absolute ethanol and dietha...

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Abstract

The invention discloses a metal ion-doped titanium dioxide plate-type photocatalytic microreactor and a preparation method for catalyst thin films in the reactor. The reactor includes a stainless steel plate base; a groove on the stainless steel plate base is used as a single-channel reaction region; an inlet and an outlet respectively communicated with an inlet and an outlet of the single-channel reaction region are arranged on the stainless steel plate base, the inlet is communicated with an inlet pipeline, and the outlet is communicated with an outlet pipeline; one face, having the groove, of the stainless steel plate base and one face of a light-penetrating surface are each loaded with the metal ion-doped TiO2 catalyst thin film; the face, loaded with the catalyst thin film, of the light-penetrating surface is in opposite arrangement with the face, having the groove, of the stainless steel plate base, and has the periphery edges bonded and fixed by a sealing adhesive; an incident light source is arranged above the light-penetrating surface opposite to the groove. By using the device and the method, the light utilization efficiency is higher, and the degradation rate is increased to 2 times of the original degradation rate of an undoped TiO2 catalyst.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to microreactor technology. Background technique [0002] TiO 2 Photocatalytic materials have the advantages of high photocatalytic activity, strong oxidation ability, high stability, and no pollution, and are currently one of the photocatalytic materials with the most potential for promotion and application. However, when it is applied to photocatalytic reactions, there are disadvantages such as narrow spectral response range (wavelength below 387nm), easy recombination of photogenerated electron-hole pairs, and poor surface selective adsorption performance. Therefore, researchers at home and abroad have studied TiO 2 Photocatalysts have been modified (Gu Hengda et al., Applied Chemical Industry, 2007, 36(2): 136-139; Niu Xinshu et al., Electronic Components and Materials, 2004, 23(8): 39-44; Zhu Yuchan et al., Guangdong Chemical Industry, 2010,37(12):19-22), mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/12B01J23/10B01J23/34B01J23/06B01J23/72B01J23/745B01J23/755
Inventor 刘明言林骋杨中国
Owner TIANJIN UNIV
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