Oxygen-deficient titanium dioxide catalyst as well as preparation method and application thereof

A technology of titanium dioxide and nano-titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, physical/chemical process catalysts, etc., can solve the problems of complex process, unfavorable industrial application, high energy consumption, etc., achieve high degradation rate, novel technology, Experiment with the effect of less energy consumption

Active Publication Date: 2020-04-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In preparation containing defects and Ti 3+ The process of self-doping titanium dioxide often adopts the method of element doping and high-temperature calcination. The above methods are often complicated in the preparation process and consume high energy, which is not conducive to the realization of industrial applications.

Method used

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  • Oxygen-deficient titanium dioxide catalyst as well as preparation method and application thereof
  • Oxygen-deficient titanium dioxide catalyst as well as preparation method and application thereof
  • Oxygen-deficient titanium dioxide catalyst as well as preparation method and application thereof

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preparation example Construction

[0034] The preparation method of the oxygen-deficient titania catalyst of the present invention comprises the following steps:

[0035] a. Uniformly disperse titanium dioxide in the plasma reactor, and pass through the working gas to empty the reactor;

[0036] b. Keep the working gas continuously fed, then turn on the power supply of the plasma reactor, adjust the power supply voltage and current to a stable working state, under the conditions of the plasma reactor voltage of 80-140V and current of 1.35-1.93A, Treat for 20 to 50 minutes. After the treatment, turn off the power first, and then turn off the gas source. After the reactor is cooled to room temperature, an oxygen-deficient nano-titanium dioxide catalyst is obtained;

[0037] Wherein, the working gas is composed of H 2 and N 2 composition.

[0038] The reaction of the present invention is carried out under normal pressure, and the outside of the reaction does not need to be heated.

[0039] Preferably, 0.3-0.6 ...

Embodiment 1

[0059] Step 1: Evenly disperse the weighed 0.3g commercial titanium dioxide P25 in the DBD dielectric barrier discharge cold plasma reactor;

[0060] Step 2: Pass N into the plasma reactor in Step 1 2 -H 2 Mixed gas, the purpose is to evacuate the air in the plasma reactor in step 1, wherein the flow rate of nitrogen-hydrogen mixed gas is 40mL / min, N 2 :H 2 The volume percentage is 99%:1%, and the emptying time is 5 minutes;

[0061] Step 3: Keep N 2 -H 2 Continue to connect in the state of step 2, then turn on the power supply of the DBD cold plasma reactor, and adjust the power supply voltage and current to a stable working state. At this time, the voltage is 100V and the current is 1.58A.

[0062] Step 4: Continue N at step 3 2 -H 2 Under plasma gas atmosphere, process for 30min.

[0063] Step 5: After the treatment, turn off the power first, then turn off the gas source, wait for the reactor to cool down to room temperature, and collect the catalyst.

[0064] Step...

Embodiment 2

[0066] Step 1: Evenly disperse 0.3 g of commercial titanium dioxide P25 in a DBD dielectric barrier discharge cold plasma reactor.

[0067] Step 2: Pass N into the plasma reactor in Step 1 2 -H 2 Mixed gas, the purpose is to evacuate the air in the plasma reactor in step 1, wherein the flow rate of nitrogen-hydrogen mixed gas is 100mL / min, N 2 :H 2 The volume percentage is 95%:5%, and the emptying time is 5 minutes.

[0068] Step 3: Keep N 2 -H 2 Continue to connect in the state of step 2, then turn on the power supply of the DBD cold plasma reactor, and adjust the power supply voltage and current to a stable working state. At this time, the voltage is 100V and the current is 1.58A.

[0069] Step 4: Continue N at step 3 2 -H 2 Under the plasma gas atmosphere, the treatment time of titanium dioxide is 30min.

[0070] Step 5: After the treatment, turn off the power first, then turn off the gas source, wait for the reactor to cool down to room temperature, and collect the...

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Abstract

The invention belongs to the field of synthesis of titanium dioxide photocatalytic materials, and particularly relates to an oxygen-deficient titanium dioxide catalyst as well as a preparation methodand application thereof. The preparation method of the oxygen-deficient titanium dioxide catalyst comprises the following steps: a, uniformly dispersing titanium dioxide in a plasma reactor, and introducing a working gas to carry out emptying treatment on the reactor; b, keeping the continuous introduction of the working gas, and treating for 20-50 min under the conditions that the voltage of theplasma reactor is 80-140 V and the current is 1.35-1.93 A to obtain the oxygen-deficient nano titanium dioxide catalyst, wherein the working gas is composed of H2 and N2. The preparation method is simple, and the prepared catalyst has good catalytic degradation activity on organic matters.

Description

technical field [0001] The invention belongs to the field of synthesis of titanium dioxide photocatalytic materials, and in particular relates to an oxygen-deficient titanium dioxide catalyst and a preparation method and application thereof. Background technique [0002] Since 1972, Fujishima and Honda (A Fujishima, Honda K. Electrochemical photolysis of water at a semiconductor electrode [J]. Nature, 1972, 238 (5358): 37-38.) found that titanium dioxide single crystal electrodes can Since the decomposition of water into hydrogen and oxygen (Honda-Fujishima Effect), titanium dioxide photocatalysis has attracted extensive research by many researchers; due to the advantages of low cost, non-toxicity, ultraviolet light response and large environmental reserves, titanium dioxide has been widely used in recent decades. It is widely used in organic matter degradation, solar cells, hydrogen production by hydrolysis and biotechnology. However, the shortcomings of titanium dioxide i...

Claims

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Application Information

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IPC IPC(8): B01J21/06C01G23/08C02F1/30C02F101/38
CPCB01J21/063C02F1/30C01G23/08C02F2101/40C01P2002/72C01P2002/85B01J35/39
Inventor 吴洪波文婕张连红张国平于明伟
Owner SOUTHWEST PETROLEUM UNIV
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