A chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material and its preparation method and application

A technology of titanium dioxide and amino modification, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, analytical materials, etc., can solve the problem of poor detection of acetone and achieve improved gas-sensing performance, Effects of improving sensitivity and increasing adsorption capacity

Active Publication Date: 2020-10-30
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

However, even if compounding other semiconductor materials or doping metal ions in the semiconductor material can improve the sensitivity of the sensor, this type of sensor is still not very good at detecting acetone, especially at low concentrations of acetone.

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  • A chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material and its preparation method and application
  • A chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material and its preparation method and application
  • A chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material and its preparation method and application

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[0026] The present invention also provides a preparation method of the chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material described in the above technical solution, comprising the following steps:

[0027] Mixing strong alkali, titanium dioxide particles, water-soluble chromium salt and water to form a precursor solution; performing a hydrothermal reaction on the precursor solution to obtain a hydrothermal reaction solution; centrifuging the precipitate obtained from the hydrothermal reaction solution for washing , drying and sintering to obtain chromium-doped titania nanotubes;

[0028] Using the improved Hummers method to prepare graphene oxide to obtain graphene oxide; modifying the graphene oxide with ethylenediamine to obtain amino-modified graphene oxide;

[0029] Mixing the chromium-doped titanium dioxide nanotubes with N,N-dimethylformamide to obtain a chromium-doped titanium dioxide nanotube solution; mixing the amino-modified gr...

Embodiment 1

[0073] Step 1 Preparation of chromium-doped titania nanotubes

[0074] 20g sodium hydroxide and 50mL deionized water were stirred for 10min to obtain a NaOH solution with a concentration of 10mol / L, and 1g nano-TiO 2 Add the particles into the NaOH solution, sonicate for 5 minutes, and continue to stir for 20 minutes to obtain a titanium dioxide solution; dissolve 1.5 g of chromium nitrate hexahydrate in 28 mL of deionized water, and stir mechanically for 10 minutes to obtain a chromium nitrate solution; add the chromium nitrate solution dropwise to the titanium dioxide solution , the dropwise addition is completed within 5 minutes, and the stirring is continued for 25 minutes to obtain a precursor solution;

[0075] Pour all the precursor solution into a 100mL reaction kettle, place it in an oven at 150°C and heat it for 20h (hydrothermal reaction). Put the hydrothermal reaction liquid into a 500mL beaker, first wash the product with 1% hydrochloric acid, adjust the pH value...

Embodiment 2

[0085] Step 1 Preparation of chromium-doped titania nanotubes

[0086] Add 2g of sodium hydroxide to 50mL of deionized water, and stir mechanically for 10min to obtain a NaOH solution with a concentration of 1mol / L. Add 0.1g of nano-TiO 2 Add the particles into the NaOH solution, sonicate for 5 minutes, and continue to mechanically stir for 20 minutes to obtain a titanium dioxide solution; dissolve 0.15 g of chromium nitrate hexahydrate in 20 mL of deionized water, and mechanically stir for 10 to obtain a chromium nitrate solution; add the chromium nitrate solution dropwise to the titanium dioxide solution During the process, the dropwise addition is completed within 5 minutes, and the mechanical stirring is continued for 25 minutes to obtain the precursor solution;

[0087] Pour all the precursor solution into a 100mL reaction kettle, place it in an oven at 160°C and heat it for 24h (hydrothermal reaction). Put the hydrothermal reaction liquid into a 500mL beaker, first wash...

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Abstract

The invention provides a chromium-doped titanium dioxide nanotube-amino modified graphene oxide composite material as well as a preparation method and application thereof, and belongs to the technicalfield of composite materials. Chromium ions are doped on a titanium dioxide nanotube, so that the gas-sensitive property of the titanium dioxide nanotube is improved; amino-modified graphene oxide iscompounded with the chromium ion-doped titanium dioxide nanotube, so that the adsorbability of the composite material in contact with gas is increased, and further the sensitivity of the material isimproved. In addition, through compounding of the chromium-doped titanium dioxide nanotube with the amino modified graphene oxide, the polymerization of amino modified graphene oxide sheets is prevented to a certain extent; the form of multi-dimensional combination of tubes dispersed on the surface is formed to increase the adsorption capacity of the composite material to the gas, which can also be used for detecting low concentration of acetone gas. Data from the embodiment shows that the response of the composite material provided by the invention to acetone of 20 ppm is 4.091.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a chromium-doped titanium dioxide nanotube-amino-modified graphene oxide composite material and a preparation method and application thereof. Background technique [0002] A gas sensor is a sensitive gas element that can detect toxic, harmful, and flammable gases, and is generally made of metal oxide or semiconductor metal oxide materials. The gas sensors that have been developed so far include semiconductor gas sensors, catalytic combustion gas sensors, infrared gas sensors, etc., which can be used to detect various gases. Among them, semiconductor gas sensors have become a type of gas sensor with a wide range of applications and strong practical value due to their advantages such as simple preparation process, low cost, high sensitivity, short response recovery time, and good selectivity stability. With the continuous improvement of technology, higher and higher re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J31/02G01N27/00
CPCB01J27/24B01J31/0254G01N27/00
Inventor 姜丽丽于海涛涂思豪
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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