CN215939937U - Dielectric barrier discharge device for preparing modified titanium dioxide - Google Patents
Dielectric barrier discharge device for preparing modified titanium dioxide Download PDFInfo
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- CN215939937U CN215939937U CN202121877695.3U CN202121877695U CN215939937U CN 215939937 U CN215939937 U CN 215939937U CN 202121877695 U CN202121877695 U CN 202121877695U CN 215939937 U CN215939937 U CN 215939937U
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Abstract
The utility model relates to a dielectric barrier discharge device for preparing modified titanium dioxide, which comprises a dielectric barrier discharge reactor, an external power supply, a gas mixing buffer tank, a hydrogen tank, a helium tank, a nitrogen tank, a water pump and a gasification device. The device has simple structure, convenient use and low cost, and the titanium dioxide modified by the device has excellent specific surface area and surface structure and stable performance, thereby achieving the effects of high adsorption and high dispersion. The surface of the titanium dioxide modified by the device contains a large amount of oxygen active groups, and has a certain pollutant purification effect.
Description
Technical Field
The utility model belongs to the field of material modification in the environmental protection technology, and particularly relates to a dielectric barrier discharge device for preparing modified titanium dioxide.
Background
As one of low-temperature plasma NTP) technologies, dielectric barrier discharge DBD) technology is widely used in the field of material modification due to its advantages of high efficiency, environmental protection, no secondary pollution, etc. The DBD technology can excite high-energy electrons to generate plasma to process and purify substances in the device, and forms an electron bombardment effect on the surface of a processed material to initiate a plurality of physical and chemical reactions, so as to change the surface properties of the processed material, and is a discharge reaction device which has been popular in recent years. However, at present, no dielectric barrier discharge device particularly suitable for modified titanium dioxide exists.
SUMMERY OF THE UTILITY MODEL
According to the dielectric barrier discharge device for preparing the modified titanium dioxide, the device can be used for preparing the modified titanium dioxide, and is simple in structure, convenient to use and low in cost, and the modified titanium dioxide prepared by the device is excellent in specific surface area and surface structure and stable in performance, so that the effects of high adsorption and high dispersion are achieved.
A dielectric barrier discharge device for preparing modified titanium dioxide,
comprises a dielectric barrier discharge reactor, an external power supply, a gas mixing buffer tank, a hydrogen tank, a helium tank, a nitrogen tank, a water pump and a gasification device;
the dielectric barrier discharge reactor comprises an outer quartz tube, an inner electrode, an outer electrode, a connecting sleeve and a bottom cover;
the top of the outer quartz tube is provided with a feeding hole, the bottom of the outer quartz tube is provided with a discharging hole, the bottom cover is sleeved on the peripheral tube wall of the discharging hole at the bottom of the outer quartz tube and used for opening and closing the discharging hole, the bottom tube opening of the connecting sleeve is sleeved on the peripheral tube wall of the feeding hole at the top of the outer quartz tube, the side wall of the connecting sleeve is provided with an air inlet for communicating the inner cavity and the outside of the connecting sleeve, the top wall of the connecting sleeve is closed, and the middle part of the connecting sleeve is provided with a first through hole which is communicated up and down;
the bottom of the inner quartz tube is closed, the inner quartz tube sequentially penetrates through the first through hole of the connecting sleeve and the feed inlet of the outer quartz tube to be inserted into the outer quartz tube, the top of the inner quartz tube is reserved above the top of the connecting sleeve, and a reaction chamber for containing titanium dioxide is formed between the outer peripheral wall of the inner quartz tube and the inner peripheral wall of the outer quartz tube;
the top of the inner quartz tube is provided with an opening, the inner electrode is inserted into the inner quartz tube from the opening of the inner quartz tube, and the inner electrode is electrically connected with the external power supply;
a first quartz cotton layer sleeved between the outer peripheral wall of the inner quartz tube and the inner peripheral wall of the feeding hole is arranged in the feeding hole of the outer quartz tube, and a second quartz cotton layer positioned between the discharging hole and the top surface of the bottom cover is arranged at the bottom of the outer quartz tube;
the outer electrode is sleeved on the outer peripheral wall of the outer quartz tube and is grounded;
an opening at one side of the gas mixing buffer tank is connected with the gas inlet of the connecting sleeve through a gas guide pipe,
the water pump is connected with a gasification device for preparing water vapor through an air duct, and the hydrogen tank, the helium tank, the nitrogen tank and the gasification device are all connected with the opening at the other side of the gas mixing buffer tank through the air duct.
Furthermore, the inner electrode is a high-purity tungsten rod.
Furthermore, a circle of limiting grooves are annularly arranged on the outer peripheral wall of the outer quartz tube, and the outer electrode is arranged in the limiting grooves; the outer electrode is a stainless steel net.
Furthermore, the dielectric barrier discharge device for preparing the modified titanium dioxide also comprises a polytetrafluoroethylene film layer which is arranged in the reaction chamber and used for wrapping the titanium dioxide, and the polytetrafluoroethylene film layer is breathable but cannot enable the titanium dioxide to pass through.
When the dielectric barrier discharge device for preparing the modified titanium dioxide is used for preparing the modified titanium dioxide, the volume ratio of the hydrogen tank to the helium tank to the nitrogen tank is as follows: 1: 10: 50, the volume ratio of the sum of hydrogen, helium and nitrogen to water is 10: 1. During preparation, titanium dioxide is placed in a reaction cavity, then gas is introduced, an external power supply is added, the external potential voltage of the power supply is 3-7kV, the frequency is 20kHz,
description of the principle:
the utility model provides a dielectric barrier discharge device for preparing modified titanium dioxide, which can excite high-energy electrons to form a high-frequency alternating current electric field. The gas components in the treatment device are mainly nitrogen and oxygen) are excited under the action of the plasma and react with the titanium dioxide to be treated in the reactor, so that oxidation active groups are generated on the surface of the titanium dioxide, and the active groups can be favorable for realizing better adhesive force and dispersibility of the titanium dioxide. In addition, a large amount of high-energy electrons generated by the device can treat and purify impurities in the titanium dioxide, modify the surface structure of the titanium dioxide and finally cause the titanium dioxide to have more pore structures and larger specific surface area, thereby being beneficial to realizing good purification function of the treated titanium dioxide.
Compared with the prior art, the utility model has the following beneficial effects:
the device has simple structure, convenient use and low cost, and the titanium dioxide modified by the device has excellent specific surface area and surface structure and stable performance, thereby achieving the effects of high adsorption and high dispersion.
The surface of the titanium dioxide modified by the device contains a large amount of oxygen active groups, and has a certain pollutant purification effect.
Drawings
Fig. 1 is a schematic structural view of a dielectric barrier discharge reactor of example 1 of the present invention.
Fig. 2 is a schematic structural view of embodiment 1 of the present invention.
Detailed Description
The utility model will be further elucidated with reference to the following embodiments:
example 1
As shown in fig. 1 and 2, a dielectric barrier discharge device for preparing modified titanium dioxide comprises a dielectric barrier discharge reactor 1, an external power supply 2, a gas mixing buffer tank 3, a hydrogen tank 4, a helium tank 5, a nitrogen tank 6, a water pump 7 and a gasification device 8;
the dielectric barrier discharge reactor 1 comprises an outer quartz tube 1-1, an inner quartz tube 1-2, an inner electrode 1-3, an outer electrode 1-4, a connecting sleeve 1-5 and a bottom cover 1-6;
the top of the outer quartz tube 1-1 is provided with a feeding hole 1-1-1, the bottom of the outer quartz tube 1-1 is provided with a discharging hole 1-1-2, the bottom cover (1-6) is sleeved on the peripheral tube wall of the discharging hole 1-1-2 at the bottom of the outer quartz tube 1-1 and used for opening and closing the discharging hole 1-1-2, the bottom tube opening of the connecting sleeve 1-5 is sleeved on the peripheral tube wall of the feeding hole 1-1-1 at the top of the outer quartz tube 1-1, the side wall of the connecting sleeve 1-5 is provided with an air inlet 1-5-1 for communicating the inner cavity of the connecting sleeve 1-5 with the outside, the top wall of the connecting sleeve 1-5 is closed, and the middle part of the connecting sleeve 1-5 is provided with a first through hole 1-5-2 which is communicated up and down;
the bottom of the inner quartz tube 1-2 is closed, the inner quartz tube sequentially penetrates through the first through hole 1-5-2 of the connecting sleeve 1-5 and the feed inlet 1-1-1 of the outer quartz tube 1-1 to be inserted into the outer quartz tube 1-1, the top of the inner quartz tube 1-2 is reserved above the top of the connecting sleeve 1-5, and a reaction chamber 1-9 for containing titanium dioxide is formed between the outer peripheral wall of the inner quartz tube 1-2 and the inner peripheral wall of the outer quartz tube 1-1;
the top of the inner quartz tube 1-2 is provided with an opening 1-2-1, the inner electrode 1-3 is inserted into the inner quartz tube 1-2 from the opening 1-2-1 of the inner quartz tube 1-2, and the inner electrode 1-3 is electrically connected with the outer power supply 2;
a first quartz cotton layer 1-7 sleeved between the outer peripheral wall of the inner quartz tube 1-2 and the inner peripheral wall of the feed inlet 1-1-1 is arranged in the feed inlet 1-1-1 of the outer quartz tube 1-1, and a second quartz cotton layer 1-8 positioned between the discharge outlet 1-1-2 and the top surface of the bottom cover 1-6 is arranged at the bottom of the outer quartz tube 1-1;
the outer electrode 1-4 is sleeved on the outer peripheral wall of the outer quartz tube 1-1 and is grounded;
an opening at one side of the gas mixing buffer tank 3 is connected with the gas inlet 1-5-1 of the connecting sleeve 1-5 through a gas guide pipe,
the water pump 7 is connected with a gasification device 8 used for preparing water vapor through an air duct, and the hydrogen tank 4, the helium tank 5, the nitrogen tank 6 and the gasification device 8 are all connected with the opening at the other side of the gas mixing buffer tank 3 through the air duct.
The inner electrode 1-3 is a high-purity tungsten rod.
A circle of limiting grooves are annularly arranged on the outer peripheral wall of the outer quartz tube 1-1, and the outer electrode 1-4 is arranged in the limiting grooves; the outer electrodes 1-4 are stainless steel meshes.
The dielectric barrier discharge device for preparing the modified titanium dioxide also comprises a polytetrafluoroethylene film layer which is arranged in the reaction chamber 1-9 and is wrapped outside the titanium dioxide, and the polytetrafluoroethylene film layer is breathable but cannot allow the titanium dioxide to pass through.
Claims (4)
1. A dielectric barrier discharge device for preparing modified titanium dioxide is characterized in that:
comprises a dielectric barrier discharge reactor (1), an external power supply (2), a gas mixing buffer tank (3), a hydrogen tank (4), a helium tank (5), a nitrogen tank (6), a water pump (7) and a gasification device (8);
the dielectric barrier discharge reactor (1) comprises an outer quartz tube (1-1), an inner quartz tube (1-2), an inner electrode (1-3), an outer electrode (1-4), a connecting sleeve (1-5) and a bottom cover (1-6);
the top of the outer quartz tube (1-1) is provided with a feed inlet (1-1-1), the bottom is provided with a discharge outlet (1-1-2), the bottom cover (1-6) is sleeved on the peripheral tube wall of the bottom discharge port (1-1-2) of the outer quartz tube (1-1) for opening and closing the discharge port (1-1-2), the bottom tube opening of the connecting sleeve (1-5) is sleeved on the peripheral tube wall of the top feed port (1-1-1) of the outer quartz tube (1-1), the side wall of the connecting sleeve (1-5) is provided with an air inlet (1-5-1) for communicating the inner cavity of the connecting sleeve (1-5) with the outside, the top wall of the connecting sleeve (1-5) is closed, and the middle part of the connecting sleeve (1-5) is provided with a first through hole (1-5-2) which is communicated up and down;
the bottom of the inner quartz tube (1-2) is closed, and the inner quartz tube sequentially penetrates through the first through hole (1-5-2) of the connecting sleeve (1-5) and the feed inlet (1-1-1) of the outer quartz tube (1-1) to be inserted into the outer quartz tube (1-1), the top of the inner quartz tube (1-2) is reserved above the top of the connecting sleeve (1-5), and a reaction chamber (1-9) for placing titanium dioxide is formed between the outer peripheral wall of the inner quartz tube (1-2) and the inner peripheral wall of the outer quartz tube (1-1);
the top of the inner quartz tube (1-2) is provided with an opening (1-2-1), the inner electrode (1-3) is inserted into the inner quartz tube (1-2) from the opening (1-2-1) of the inner quartz tube (1-2), and the inner electrode (1-3) is electrically connected with the outer power supply (2);
a first quartz cotton layer (1-7) sleeved between the outer peripheral wall of the inner quartz tube (1-2) and the inner peripheral wall of the feed port (1-1-1) is arranged in the feed port (1-1-1) of the outer quartz tube (1-1), and a second quartz cotton layer (1-8) positioned between the discharge port (1-1-2) and the top surface of the bottom cover (1-6) is arranged at the bottom of the outer quartz tube (1-1);
the outer electrode (1-4) is sleeved on the outer peripheral wall of the outer quartz tube (1-1) and is grounded;
an opening at one side of the gas mixing buffer tank (3) is connected with the gas inlet (1-5-1) of the connecting sleeve (1-5) through a gas guide pipe,
the water pump (7) is connected with a gasification device (8) used for preparing water vapor through an air duct, and the hydrogen tank (4), the helium tank (5), the nitrogen tank (6) and the gasification device (8) are connected with the opening at the other side of the gas mixing buffer tank (3) through the air duct.
2. The dielectric barrier discharge device for preparing modified titanium dioxide according to claim 1, wherein: the inner electrode (1-3) is a high-purity tungsten rod.
3. The dielectric barrier discharge device for preparing modified titanium dioxide according to claim 1, wherein: a circle of limiting grooves are annularly arranged on the outer peripheral wall of the outer quartz tube (1-1), and the outer electrode (1-4) is arranged in the limiting grooves; the outer electrodes (1-4) are stainless steel meshes.
4. The dielectric barrier discharge device for preparing modified titanium dioxide according to claim 1, wherein: the dielectric barrier discharge device for preparing the modified titanium dioxide also comprises a polytetrafluoroethylene film layer which is arranged in the reaction chamber (1-9) and is wrapped outside the titanium dioxide, and the polytetrafluoroethylene film layer is breathable but cannot allow the titanium dioxide to pass through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121877695.3U CN215939937U (en) | 2021-08-11 | 2021-08-11 | Dielectric barrier discharge device for preparing modified titanium dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121877695.3U CN215939937U (en) | 2021-08-11 | 2021-08-11 | Dielectric barrier discharge device for preparing modified titanium dioxide |
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| Publication Number | Publication Date |
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| CN215939937U true CN215939937U (en) | 2022-03-04 |
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| CN202121877695.3U Active CN215939937U (en) | 2021-08-11 | 2021-08-11 | Dielectric barrier discharge device for preparing modified titanium dioxide |
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2021
- 2021-08-11 CN CN202121877695.3U patent/CN215939937U/en active Active
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