CN112285267A - A device for online monitoring of photocatalytic reaction efficiency and gas concentration - Google Patents
A device for online monitoring of photocatalytic reaction efficiency and gas concentration Download PDFInfo
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- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention discloses a device for monitoring photocatalytic reaction efficiency and gas concentration on line, which comprises an air tank, an NO gas tank, a gas reaction tank and a gas detector, wherein the NO gas tank is arranged on one side of the air tank, a base is fixedly connected to the bottom of the NO gas tank, a first connecting pipeline is fixedly connected to the top of the air tank, a second connecting pipeline is fixedly connected to the top of the NO gas tank, a third connecting pipeline is fixedly connected to one side of the first connecting pipeline on the top of a gas washing bottle 1, one-way valves are fixedly arranged at the tail ends of the second connecting pipeline and the third connecting pipeline, a fourth connecting pipeline is connected in series with a connecting pipe of the second connecting pipeline and the third connecting pipeline, and the gas reaction tank is fixedly connected to one end of the fourth connecting pipeline, so that the device has the advantages of simple structure, convenient operation and high testing efficiency, visualizes the dynamic change of a system in the testing process to achieve the purpose of real-time, this plays an important role in constantly optimizing the test conditions.
Description
Technical Field
The invention relates to the technical field of monitoring gas reaction and concentration, in particular to a device for monitoring photocatalytic reaction efficiency and gas concentration on line.
Background
Photocatalysis is the intersection of photochemical and catalytic science and generally refers to photochemical reactions in the presence of a catalyst. The principle is based on the oxidation-reduction capability of the photocatalyst under the condition of illumination, so that the aims of purifying pollutants, synthesizing and converting substances and the like can be fulfilled. Specifically, when sunlight irradiates the surface of a solid inorganic substance, part of photons with energy higher than the forbidden band width of the inorganic substance can excite an electrode of a solid conduction band, transition to a valence band, generate a photo-generated electron (e-), and leave a positive hole (h +) in the conduction band. The photo-generated electrons and holes are transferred to the surface of the catalyst through the action of an electric field or self-diffusion movement. Chemical reactions can be driven if electrons with reducing properties and holes with oxidizing properties migrate to the solid surface and are captured by acceptors or donors before they recombine (re-combination). Photocatalytic reactions have been used for hydrogen production by water decomposition, degradation of organic pollutants, oxidation of toxic and harmful gases, oxidative decomposition of Volatile Organic Compounds (VOCs), and the like.
The key steps of photocatalysis are: the light excitation of the catalyst, the migration and capture of the photo-generated electrons and holes, the surface charge migration between the photo-generated electrons and holes and the adsorption and the in-vivo or surface recombination of the electrons and holes. The low quantum efficiency of the photocatalytic reaction is the most critical factor for the practical application of the photocatalytic reaction. The quantum efficiency depends on the recombination probability of electrons and holes, and the recombination process of electrons and holes mainly depends on two factors: the trapping process of electrons and holes on the surface of the catalyst; migration process of surface charge. We have therefore improved this and have proposed a means of monitoring the efficiency of the photocatalytic reaction and the variation in gas concentration on-line.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a device for monitoring photocatalytic reaction efficiency and gas concentration on line, which comprises an air tank, an NO gas tank, a gas reaction tank and a gas detector, wherein four corners of the bottom of the air tank are fixedly welded with supporting legs, one side of the air tank is provided with the NO gas tank, the bottom of the NO gas tank is fixedly connected with a base, the top of the air tank is fixedly connected with a first connecting pipeline, the top of the NO gas tank is fixedly connected with a second connecting pipeline, the output end of the first connecting pipeline is fixedly connected with a gas washing bottle, one side of the first connecting pipeline at the top of the gas washing bottle is fixedly connected with a third connecting pipeline, the output end of the third connecting pipeline is fixedly connected with the output end of the second connecting pipeline, the tail ends of the second connecting pipeline and the third connecting pipeline are fixedly provided with one-way valves, and connecting pipes of the second connecting pipeline and the third connecting pipeline are connected with a fourth connecting pipeline in series, and one end of the fourth connecting pipeline is fixedly connected with a gas reaction tank.
As a preferred technical solution of the present invention, one end of the gas reaction tank is fixedly connected with a fifth connecting pipeline, one end of the fifth connecting pipeline is fixedly connected with a gas detector, and one end of the gas detector is fixedly provided with a gas outlet.
As a preferable technical solution of the present invention, flowmeters are disposed outside the first connecting pipeline and the second connecting pipeline.
As a preferable technical scheme of the invention, the top of the gas reaction tank is fixedly provided with a light source part, and the light source part can adopt a xenon lamp or an LED lamp.
As a preferred technical scheme of the invention, the circumferential wall of the gas reaction tank is provided with small holes, namely a gas inlet and a gas outlet, the upper end of the gas reaction tank is provided with quartz glass, the thickness of the quartz glass is set to be 8mm, two ends of the quartz glass are respectively provided with a rubber ring, the top end cover of the quartz glass is provided with a stainless steel circular ring, and the circumferences of the base and the upper circular ring are respectively provided with 3 screw modules.
As a preferred technical scheme of the invention, a gas reaction space is arranged at the bottom end of the quartz glass, a stainless steel base is arranged at the bottom end of the gas reaction space, and a water inlet and a water outlet are respectively arranged at two ends of the stainless steel base.
As a preferable technical scheme of the invention, the bottom of the gas reaction tank is provided with a stainless steel base and is divided into two layers, the lowest layer is provided with a water supply module, and the upper layer is provided with a sample placing part.
A method for monitoring the efficiency of photocatalytic reaction and gas concentration on line is used for the device for monitoring the efficiency of photocatalytic reaction and gas concentration on line, and comprises the following steps:
the method comprises the following steps: fully grinding the photocatalyst by taking soil as an example, adding pure water, stirring, uniformly dispersing soil particles in the pure water by using ultrasonic waves, pouring the soil particles on a quartz glass sheet, and coating a circle of the circumference of the glass sheet with a hot melt adhesive in advance to prevent liquid from flowing out;
step two: putting into a drying oven, drying at 75 ℃, and removing the surrounding hot melt adhesive. So that the photocatalyst is uniformly distributed on the glass sheet;
step three: putting the glass sheet into a reaction space, putting a quartz glass plate with the thickness of 8mm, finally covering the stainless steel ring on the uppermost layer, screwing down the screw, putting a xenon lamp, and turning on a gas detector;
step four: and adjusting the gas flow according to the test scheme, so that the test can be started to obtain the real-time concentration change data of the gas in the system.
The invention has the beneficial effects that:
1. the whole device has simple and clear structure and is easy to operate. For different photocatalysts, only the glass sheet put into the reaction space needs to be replaced, and other parts can be fixed. The influence of different photocatalysts on the catalytic efficiency is convenient to explore; the external light source can be replaced randomly according to test requirements, so that the influence of different light sources on the catalytic efficiency is conveniently researched, the test flow is simplified, the operation cost is effectively reduced, and the efficiency of exploring the photocatalytic reaction factor test is improved.
2. For the preparation of the photocatalyst, a container similar to an evaporating dish is not used, so that the blockage of the wall of the container to the gas flow is avoided, and therefore, the reaction gas can be uniformly and smoothly blown across the interface of the photocatalyst, and more accurate test results can be obtained.
3. The test efficiency is high, and the dynamic change of the system in the test process is visualized, so that the purposes of monitoring and recording data in real time are achieved.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for on-line monitoring of photocatalytic reaction efficiency and gas concentration according to the present invention;
FIG. 2 is a schematic diagram of the internal structure of the gas reaction of the device for on-line monitoring the efficiency and concentration of the photocatalytic reaction according to the present invention;
FIG. 3 is a first data diagram of the internal structure of the gas reaction of the apparatus for on-line monitoring the efficiency of the photocatalytic reaction and the gas concentration according to the present invention;
FIG. 4 is a second data diagram of the gas reaction internal structure of an apparatus for on-line monitoring of photocatalytic reaction efficiency and gas concentration according to the present invention;
FIG. 5 is a third data diagram of an apparatus for on-line monitoring of photocatalytic reaction efficiency and gas concentration in accordance with the present invention.
In the figure: 1. an air tank; 2. supporting legs; 3. a NO gas canister; 4. a base; 5. a first connecting pipe; 6. a second connecting pipe; 7. a flow meter; 8. a gas washing bottle; 9. a third connecting pipe; 10. a one-way valve; 11. a fourth connecting pipe; 12. a gas reaction tank; 13. a fifth connecting pipe; 14. a gas detector; 15. an air outlet; 16. a light source unit; 17. a rubber ring; 18. quartz glass; 19. a gas reaction space; 20. a stainless steel base; 21. a water inlet; 22. and (7) a water outlet.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in FIGS. 1-5, the device for on-line monitoring of photocatalytic reaction efficiency and gas concentration of the present invention comprises an air tank 1, an NO gas tank 3, a gas reaction tank 12 and a gas detector 14, wherein four corners of the bottom of the air tank 1 are fixedly welded with supporting legs 2, one side of the air tank 1 is provided with the NO gas tank 3, the bottom of the NO gas tank 3 is fixedly connected with a base 4, the top of the air tank 1 is fixedly connected with a first connecting pipeline 5, the top of the NO gas tank 3 is fixedly connected with a second connecting pipeline 6, the output end of the first connecting pipeline 5 is fixedly connected with a gas washing bottle 8, one side of the first connecting pipeline 5 at the top of the gas washing bottle 8 is fixedly connected with a third connecting pipeline 9, the output end of the third connecting pipeline 9 is fixedly connected with the output end of the second connecting pipeline 6, and the ends of the second connecting pipeline 6 and the third connecting pipeline 9 are both fixedly provided with a one-, the connecting pipes of the second connecting pipeline 6 and the third connecting pipeline 9 are connected with a fourth connecting pipeline 11 in series, and one end of the fourth connecting pipeline 11 is fixedly connected with a gas reaction tank 12.
Wherein, the one end fixedly connected with fifth connecting tube 13 of gas retort 12, the one end fixedly connected with gas detector 14 of fifth connecting tube 13, the fixed gas outlet 15 that is provided with in one end of gas detector 14, fifth connecting tube 13 adopts the PVC material to make, is connected with the gas retort through the transparent trachea of PVC, can read out in real time and record different gas concentration numerical values in the reaction space.
Wherein, the outer sides of the first connecting pipeline 5 and the second connecting pipeline 6 are both provided with a flowmeter 7, the reaction gas (taking NO as an example) is mixed and conveyed into the reaction generating device through a PVC transparent gas pipe by the provided flowmeters 7, and the flow rate of the reaction gas is controlled by adjusting the flowmeters.
The top of the gas reaction tank 12 is fixedly provided with a light source part 16, the light source part 16 can adopt a xenon lamp or an LED lamp, and the top of the gas reaction tank 12 is fixedly provided with the light source part 16 which can be used as a photocatalyst.
Wherein, it has the aperture to open on the circumference wall of gas retort 12, air inlet and gas outlet promptly, quartz glass 18 has been seted up to the upper end of gas retort 12, quartz glass 18's thickness sets to 8mm thick, and quartz glass 18's both ends all are equipped with rubber circle 17, 18 top end covers of quartz glass are equipped with the stainless steel ring, the circumference of base and upper ring all is equipped with 3 screw modules, the circumference of base and upper ring is equipped with 3 screw devices, can guarantee the gas tightness after screwing up, 8mm thick quartz glass board both sides all have the rubber circle, play buffering and sealed effect.
Wherein, the bottom of quartz glass 18 is equipped with gas reaction space 19, and the bottom of gas reaction space 19 is provided with stainless steel base 20, and the both ends of stainless steel base 20 are provided with water inlet 21 and delivery port 22 respectively, are provided with water inlet 21 and delivery port 22 respectively at the both ends of stainless steel base 20 and are convenient for the business turn over of water.
Wherein, the bottom of gas retort 12 is provided with stainless steel base 20 and divide into two-layerly, and the lower floor sets up to the water supply module, and the upper strata sets up the sample portion of placing, and the stainless steel base divide into two-layerly, and the lower floor supplies water through in order to reach refrigerated effect, and the upper strata is used for placing the sample, photocatalyst promptly.
A method for monitoring the efficiency of photocatalytic reaction and gas concentration on line is used for the device for monitoring the efficiency of photocatalytic reaction and gas concentration on line, and comprises the following steps:
the method comprises the following steps: fully grinding the photocatalyst, taking soil as an example, uniformly dispersing the photocatalyst in pure water, stirring the ground photocatalyst, pouring the ground photocatalyst on quartz glass, and coating hot melt adhesive on a circle of the circumference of a glass sheet in advance to prevent liquid from flowing out;
step two: putting into a drying oven, drying at 75 ℃, and removing the surrounding hot melt adhesive. So that the photocatalyst is uniformly distributed on the glass sheet;
step three: putting the glass sheet into a reaction space, putting a quartz glass plate with the thickness of 8mm, finally covering the stainless steel ring on the uppermost layer, screwing down the screw, putting a xenon lamp, and turning on a gas detector;
step four: and adjusting the gas flow according to the test scheme, so that the test can be started to obtain the real-time concentration change data of the gas in the system.
The working principle is as follows: firstly checking whether the device is normal or not, including the air tightness of the device, the connection of an air bottle and an air pipe and whether parts are complete or not, after the checking is finished, the output end of a first connecting pipeline 5 is fixedly connected with a gas washing bottle 8, one side of the first connecting pipeline 5 at the top of the gas washing bottle 8 is fixedly connected with a third connecting pipeline 9, the output end of the third connecting pipeline 9 is fixedly connected with the output end of a second connecting pipeline 6, the tail ends of the second connecting pipeline 6 and the third connecting pipeline 9 are respectively and fixedly provided with a one-way valve 10, the one-way valve 10 is opened to enable the gas to enter a gas reaction tank 12, meanwhile, the outer sides of the first connecting pipeline 5 and the second connecting pipeline 6 are respectively provided with a flowmeter 7, the reaction gas (taking NO as an example) is mixed and conveyed into the reaction generating device through a PVC transparent air pipe through the flowmeter 7, the flow of the reaction gas is controlled by adjusting, the gas reaction tank 12 is provided with small holes, namely a gas inlet and a gas outlet, the upper end of the gas reaction tank 12 is provided with quartz glass 18, the thickness of the quartz glass 18 is set to be 8mm, both ends of the quartz glass 18 are respectively provided with a rubber ring 17, the top end cover of the quartz glass 18 is provided with a stainless steel ring, the circumferences of the base and the upper ring are respectively provided with 3 screw modules, the circumferences of the base and the upper ring are respectively provided with 3 screw devices, the tightness can be ensured after screwing, both sides of the quartz glass plate with the thickness of 8mm are respectively provided with the rubber ring to play a role of buffering and sealing, the top of the gas reaction tank 12 is fixedly provided with a light source part 16 which can be used as a photocatalyst, the photocatalyst is fully ground by taking soil as an example, the pure water is added for stirring, soil particles are uniformly dispersed in the pure water by using ultrasonic waves, then the glue is poured on the quartz glass plate, one circle of the circumference of the hot melt glue plate, putting into a drying oven, drying at 75 ℃, and removing the surrounding hot melt adhesive. So that the photocatalyst is uniformly distributed on the glass sheet; putting the glass sheet into a reaction space, putting a quartz glass plate with the thickness of 8mm, finally covering the stainless steel ring on the uppermost layer, screwing down the screw, putting a xenon lamp, and turning on a gas detector; the test can be started by adjusting the gas flow according to the test scheme, and the gas reaction tank is connected with the PVC transparent gas pipe, so that the concentration values of different gases in the reaction space can be read and recorded in real time, and the real-time concentration change data of the gases in the system can be obtained.
Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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