Novel testing device for photocatalytic degradation of formaldehyde

Abstract

The utility model relates to a novel testing device for photocatalytic degradation of formaldehyde. The novel testing device comprises a formaldehyde generation chamber, an environment simulation chamber, a catalytic support plate, an ultraviolet light source and a formaldehyde detector, the formaldehyde generating chamber is used for generating formaldehyde gas with different concentrations; the environment simulation chamber is used for simulating photocatalytic degradation operation of formaldehyde gas under specific experiment conditions; the catalytic support plate comprises a base plate and a catalyst coated on the base plate; the ultraviolet light source is used for providing ultraviolet light required by the photocatalytic reaction; the formaldehyde detector is used for analyzing and detecting the formaldehyde content in the environment simulation chamber; wherein the environment simulation chamber is communicated with the formaldehyde generation chamber, and the catalytic support plate and the ultraviolet light source are arranged in the environment simulation chamber. The novel testing device for photocatalytic degradation of formaldehyde, disclosed by the utility model, is simple in structure and convenient to operate, not only can accurately control the generation and degradation process of formaldehyde, but also effectively improves the accuracy and repeatability of experiments, and provides a reliable experimental platform for the research and application of photocatalysts.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of formaldehyde catalytic degradation especially relates to a novel photocatalytic degradation formaldehyde testing arrangement. BACKGROUND

[0002] With the rapid development of economy and the improvement of people's living standards, indoor decoration has become a common phenomenon. However, the harmful substances such as formaldehyde released in the decoration materials pose a serious threat to human health. Effective removal of indoor formaldehyde and construction of livable environment become an urgent need. The traditional formaldehyde removal method is often inefficient and may cause secondary pollution. Photocatalytic technology as a green and environmentally friendly technology uses light to drive the decomposition of formaldehyde into harmless carbon dioxide and water, showing potential in formaldehyde degradation. In order to further study the effect and mechanism of photocatalytic technology in degrading formaldehyde, the utility model provides a novel photocatalytic degradation formaldehyde testing device, which aims to screen efficient photocatalysts through a laboratory-level closed system, in order to achieve more efficient and environmentally friendly formaldehyde degradation effect. SUMMARY

[0003] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a novel photocatalytic degradation formaldehyde testing device to solve the technical problems of complex operation, low efficiency, inability to accurately simulate experimental conditions, and difficulty in adapting to different photocatalyst testing requirements of traditional formaldehyde testing devices. The utility model integrates advanced photocatalytic technology, precise control system, multifunctional experimental platform design, and efficient data recording and analysis system, aiming to provide a simple structure, easy operation, high reliability, and efficient formaldehyde degradation testing device, thereby providing more accurate, flexible, and efficient formaldehyde degradation testing solutions for researchers and industrial applications.

[0004] To achieve the above purpose, the utility model adopts the technical scheme of:

[0005] A novel photocatalytic degradation formaldehyde testing device, the testing device comprises:

[0006] A formaldehyde generation chamber for generating formaldehyde gas of different concentrations;

[0007] An environmental simulation chamber for simulating photocatalytic degradation of formaldehyde gas under specific experimental conditions;

[0008] A catalytic carrier plate comprising a substrate and a catalyst coated on the substrate for catalyzing formaldehyde degradation;

[0009] An ultraviolet light source for providing ultraviolet light required for photocatalytic reaction; and

[0010] The formaldehyde detector is used for analyzing and detecting the formaldehyde content in the environment simulation chamber.

[0011] The environment simulation chamber is communicated with the formaldehyde generating chamber, and the catalytic carrier plate and the ultraviolet light source are arranged in the environment simulation chamber.

[0012] As a preferred technical solution, the formaldehyde generating chamber is provided with a container with a double-layer structure, the inner layer of the container is used for containing formaldehyde solution, and the outer layer is heated by a water circulation system to generate formaldehyde gas.

[0013] As a preferred technical solution, the environment simulation chamber is also provided with a temperature and humidity monitor for monitoring and controlling the temperature and humidity in the environment simulation chamber.

[0014] As a preferred technical solution, the environment simulation chamber is also provided with a humidifier for adjusting the humidity in the environment simulation chamber.

[0015] As a preferred technical solution, the environment simulation chamber has an adjustable ventilation system for simulating different air flow conditions.

[0016] As a preferred technical solution, the simulation of specific experimental conditions includes but is not limited to air humidity, temperature, flow rate, initial concentration of formaldehyde, etc. These conditions can be accurately controlled by the novel photocatalytic degradation formaldehyde testing device to simulate the formaldehyde degradation process in the actual environment, thereby providing scientific experimental basis for the efficiency evaluation and selection of photocatalysts.

[0017] As a preferred technical solution, the top of the environment simulation chamber is designed as an openable sealing cover plate to facilitate the debugging and maintenance of the equipment.

[0018] As a preferred technical solution, the catalytic carrier plate is designed to be detachable, which facilitates the replacement of different types of catalysts for testing.

[0019] As a preferred technical solution, the formaldehyde detector includes an electrochemical formaldehyde detector and a photoelectric photometric formaldehyde detector; the electrochemical formaldehyde detector is used for detecting high-concentration formaldehyde gas, and the photoelectric photometric formaldehyde detector is used for testing low-concentration formaldehyde gas.

[0020] As a preferred technical solution, the electrochemical formaldehyde detector is arranged in the environment simulation chamber; the photoelectric photometric formaldehyde detector is arranged outside the environment simulation chamber, and the sample inlet of the photoelectric photometric formaldehyde detector is communicated with the environment simulation chamber through a pipeline.

[0021] As a preferred technical solution, a gas pump is further arranged on the pipeline communicated between the environment simulation chamber and the formaldehyde generating chamber for controlling the flow of formaldehyde gas.

[0022] As a preferred technical solution, the test device further comprises a data recording system for storing and analyzing data of changes in formaldehyde concentration.

[0023] Compared with the prior art, the novel photocatalytic degradation formaldehyde test device has the beneficial effects that:

[0024] The novel photocatalytic degradation formaldehyde test device has the beneficial effects that: the advanced photocatalytic technology is combined with the precise control system, the overall device has simple structure, is easy to assemble and disassemble, is convenient to operate, has high reliability, and can realize efficient degradation of formaldehyde. Through optimization of the design of the formaldehyde generation chamber and the environment simulation chamber, the device can accurately control the generation and degradation process of formaldehyde gas and provide more accurate experimental data. In addition, the detachable design of the catalytic carrier plate makes it convenient and fast to replace different types of catalysts, thereby adapting to different experimental requirements and improving the efficiency and flexibility of the experiment. The integration of the ultraviolet light source and the application of the double detection method (electrochemical method and photoelectric photometry) of the formaldehyde detector enable the device to cover the detection range of formaldehyde gas from low concentration to high concentration, thereby improving the flexibility and accuracy of the test. The addition of the data recording system enables the data in the experimental process to be automatically recorded and analyzed, further enhancing the repeatability of the experiment and the reliability of the results. What is particularly important is that the device can simulate different experimental conditions such as air humidity, temperature, flow rate, and initial concentration of formaldehyde, thereby providing an ideal reaction environment for the photocatalyst, making it a multifunctional screening platform that supports rapid replacement and testing of various photocatalysts and helps researchers quickly identify and optimize formaldehyde catalysts with excellent degradation performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Figure 1 is a structural schematic diagram of the photocatalytic degradation formaldehyde test device of the present application.

[0026] Figure 2 Figure 2 is a physical demonstration diagram of the photocatalytic degradation formaldehyde test device of the present application.

[0027] Among them, the formaldehyde generation chamber 1, the environment simulation chamber 2, the catalytic carrier plate 3, the ultraviolet light source 4, the electrochemical formaldehyde detector 5, the photoelectric photometry formaldehyde detector 6, the temperature and humidity monitor 7, the humidifier 8, the ventilation system 9, the sealing cover plate 10, the container 11, and the air pump 12. DETAILED DESCRIPTION

[0028] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only as examples, and those skilled in the art can think of other obvious modifications. EMBODIMENT

[0029] As Figure 1and Figure 2 As shown in the drawings, the novel photocatalytic degradation of formaldehyde testing device of the embodiment includes a formaldehyde generation chamber 1 (with a size of 18 cm x 24 cm x 22 cm), an environment simulation chamber 2 (with a size of 60 cm x 40 cm x 40 cm), a catalytic carrier plate 3, an ultraviolet light source 4, and a formaldehyde detector, the formaldehyde generation chamber 1 is used to generate formaldehyde gas with different concentrations; the environment simulation chamber 2 is used to simulate the photocatalytic degradation operation of formaldehyde gas under specific experimental conditions; the catalytic carrier plate 3 includes a substrate and a catalyst coated on the substrate for catalyzing the degradation of formaldehyde; the ultraviolet light source 4 is used to provide ultraviolet light required for photocatalytic reaction; the formaldehyde detector is used to analyze and detect the formaldehyde content in the environment simulation chamber 2; wherein the environment simulation chamber 2 is in communication with the formaldehyde generation chamber 1, and the catalytic carrier plate 3 and the ultraviolet light source 4 are arranged in the environment simulation chamber 2. The novel photocatalytic degradation of formaldehyde testing device of the embodiment, the formaldehyde generation chamber 1 and the environment simulation chamber 2 are both carefully made of acrylic plates and exhibit excellent air tightness and optical transparency, especially it is convenient to directly observe and record the value of high concentration formaldehyde inside the environment simulation chamber 2 by using electrochemical sensing technology through the formaldehyde detector.

[0030] In one embodiment, the formaldehyde generation chamber 1 is provided with a container 11 with a double-layer structure, the inner layer of the container 11 is used to hold formaldehyde solution, and the outer layer is heated by a water circulation system to generate formaldehyde gas. In the embodiment, the container 11 adopts a beaker, and as an alternative technical solution, the container 11 can also adopt other vessels that can hold liquid and be heated.

[0031] In one embodiment, the environment simulation chamber 2 is also provided with a temperature and humidity monitor 7, which is used to monitor and control the temperature and humidity in the environment simulation chamber 2.

[0032] In one embodiment, the environment simulation chamber 2 is also provided with a humidifier 8, which is used to adjust the humidity in the environment simulation chamber 2.

[0033] In one embodiment, the environment simulation chamber 2 has an adjustable ventilation system 9, which is used to simulate different air flow conditions. The ventilation system 9 can control the air in the environment simulation chamber 2 to maintain a certain flow rate by directly setting a fan in the environment simulation chamber 2, so as to realize the uniform distribution of formaldehyde gas in the environment simulation chamber 2; the ventilation system 9 can also realize the uniform distribution of formaldehyde gas in the environment simulation chamber 2 by connecting flowing gas to enter the environment simulation chamber 2 for disturbance.

[0034] In one embodiment, the top of the environmental simulation chamber 2 is designed as an openable sealed cover 10 to facilitate equipment debugging and maintenance. The sealed cover 10 is equipped with an elastic sealing ring and a pressure lock to ensure the airtightness of the chamber while facilitating equipment debugging and access. The top of the formaldehyde generation chamber 1 is also designed as an openable sealed cover to facilitate equipment debugging and maintenance. The sealed cover is equipped with an elastic sealing ring and a pressure lock to ensure the airtightness of the chamber while facilitating equipment debugging and access.

[0035] In one embodiment, the formaldehyde detector includes an electrochemical formaldehyde detector 5 and a photoelectric photometric formaldehyde detector 6. The electrochemical formaldehyde detector 5 is used to detect high-concentration formaldehyde gas, and the photoelectric photometric formaldehyde detector 6 is used to test low-concentration formaldehyde gas. The electrochemical formaldehyde detector 5 is installed inside the environmental simulation chamber 2; the photoelectric photometric formaldehyde detector 6 is installed outside the environmental simulation chamber 2. The inlet of the photoelectric photometric formaldehyde detector 6 is connected to the environmental simulation chamber 2 via a pipe. A ball valve is also provided on the connecting pipe or the side wall of the environmental simulation chamber 2 to control the formaldehyde gas injection operation. This invention relates to high-concentration formaldehyde (0.5-4 mg / m³). 3 The formaldehyde detector, utilizing electrochemical detection principles, was used in real-time to read the readings within the environmental simulation chamber 2; while low concentrations of formaldehyde (0.01-0.5 mg / m³) were monitored. 3 The formaldehyde tester, which uses the photoelectric photometric detection principle, is used in the environmental simulation room 2. The reading on the tester is directly read after the test strip develops color in 8 minutes.

[0036] In one embodiment, an air pump 12 is installed on the pipeline connecting the environmental simulation chamber 2 and the formaldehyde generation chamber 1 to control the flow of formaldehyde gas, thereby achieving the circulation and pressure stability of formaldehyde gas. To further ensure the pressure balance between the formaldehyde generation chamber 1 and the environmental simulation chamber 2, two pipelines are installed between them, each equipped with an air pump 12. By simultaneously activating the air pumps 12, the pressure balance between the two chambers is ensured. An adjustable ball valve is also installed on the connecting pipeline between the formaldehyde generation chamber 1 and the environmental simulation chamber 2. These valves not only ensure an airtight connection between the two chambers but also allow for precise control of the gas flow path within the system, thereby achieving precise control of the formaldehyde gas flow. As an alternative technical solution, the ball valve can also be installed on the side wall of the formaldehyde generation chamber 1 or the environmental simulation chamber 2.

[0037] In one embodiment, the testing apparatus further includes a data recording system for storing and analyzing data on changes in formaldehyde concentration.

[0038] The working principle and operation mode of this photocatalytic degradation formaldehyde testing device are as follows: The device generates formaldehyde gas of a specific concentration through a formaldehyde generation chamber 1, which is then transported to an environmental simulation chamber 2. Inside the environmental simulation chamber 2, the formaldehyde gas, under ultraviolet light irradiation, comes into contact with the catalyst coated on a catalytic carrier plate 3, triggering a photocatalytic reaction. This process utilizes semiconductor photocatalysis technology, using ultraviolet light to excite semiconductor materials, generating separated photogenerated electrons and holes. Formaldehyde molecules are adsorbed on the surface of the photocatalyst, and through the photogenerated holes excited by the light, they undergo an oxidation reaction with the formaldehyde molecules, mineralizing them into water and carbon dioxide, thereby achieving the chemical decomposition of formaldehyde. The temperature and humidity monitor 7, humidifier 8, and ventilation system 9 within the environmental simulation chamber 2 work together to simulate actual environmental conditions, ensuring the accuracy and reliability of the experimental data. Formaldehyde detectors monitor changes in formaldehyde concentration in the environmental simulation chamber 2 in real time. The electrochemical formaldehyde detector 5 is responsible for detecting high concentrations of formaldehyde, while the photoelectric photometric formaldehyde detector 6 is suitable for testing low concentrations of formaldehyde. The data recording system automatically records formaldehyde concentration data throughout the degradation process, facilitating subsequent analysis and research. Through this integrated design, the device can efficiently and accurately evaluate the performance of different photocatalysts, providing a powerful experimental tool for the application of photocatalysis technology in formaldehyde degradation.

[0039] Specifically, the operation process of this photocatalytic degradation formaldehyde testing device is as follows: First, according to experimental requirements, a specific amount of formaldehyde solution is added to the inner layer of the double-layered container 11 (beaker) of the formaldehyde generation chamber 1, and heated through the outer water circulation system to control the generation rate and concentration of formaldehyde gas. When the experimental process begins, an appropriate amount of formaldehyde solution is injected into the double-layered beaker in the formaldehyde generation chamber 1, and then the formaldehyde generation chamber 1 is sealed. Next, the water bath heating circulation system is started to heat the beaker for 5 minutes, then the heating device is turned off, and the system is allowed to stand for 10 minutes to ensure the stable state of formaldehyde gas in the formaldehyde generation chamber (formaldehyde generation chamber 1). Afterwards, the gas valve connecting the formaldehyde generation chamber 1 and the environmental simulation chamber 2, as well as the small vacuum pump 12, are opened, allowing formaldehyde gas to smoothly enter the environmental simulation chamber 2 through a flexible pipe. When the formaldehyde concentration in the environmental simulation chamber 2 reaches the preset standard, the gas valve and the vacuum pump 12 are closed.

[0040] Subsequently, a small fan in environmental simulation chamber 2 was turned on and shut off after 5 minutes to promote uniform gas distribution. Once the instrument reading for measuring formaldehyde concentration in environmental simulation chamber 2, where the glass substrate coated with photocatalyst was located, stabilized, ultraviolet light source 4 was turned on to initiate the photocatalytic degradation process (irradiation by ultraviolet light source 4). During the experiment, different experimental parameters could be adjusted to explore their impact on formaldehyde removal efficiency. Simultaneously, the formaldehyde meter readings were recorded in real-time during the experiment, and the collected data were organized and analyzed after the experiment to draw corresponding experimental conclusions.

[0041] Throughout the experiment, the temperature and humidity monitor 7, humidifier 8, and ventilation system 9 (fan) in the environmental simulation chamber 2 worked together to simulate actual environmental conditions, ensuring the accuracy and reliability of the experimental data. Formaldehyde detectors monitored changes in formaldehyde concentration in the environmental simulation chamber 2 in real time. The electrochemical formaldehyde detector 5 was responsible for detecting high concentrations of formaldehyde, while the photoelectric photometric formaldehyde detector 6 was suitable for testing low concentrations. The data recording system automatically recorded formaldehyde concentration data throughout the degradation process, facilitating subsequent analysis and research. Furthermore, the catalyst support plate 3 of this device is designed to be detachable, allowing for easy replacement of the catalyst according to different experimental needs, further optimizing and screening for highly efficient photocatalysts (catalytic support plate 3). The design and operation of the entire device reflect a dual consideration of experimental accuracy and operational convenience, making it widely applicable and practical in scientific research and industrial applications.

[0042] Therefore, it is evident that this utility model patent has significant advantages over currently used technologies. The basic principles, main features, and advantages of this utility model have been shown and described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A novel photocatalytic degradation formaldehyde testing device, characterized in that, The testing apparatus includes: A formaldehyde generation chamber, wherein the formaldehyde generation chamber is used to generate formaldehyde gas of different concentrations; An environmental simulation chamber, used to simulate the photocatalytic degradation of formaldehyde gas under specific experimental conditions; A catalytic carrier plate, the catalytic carrier plate comprising a substrate and a catalyst coated on the substrate for catalyzing the degradation of formaldehyde; An ultraviolet light source, wherein the ultraviolet light source is used to provide ultraviolet light required for the photocatalytic reaction; and A formaldehyde detector, used to analyze and detect the formaldehyde content in a simulated indoor environment; The environmental simulation chamber is connected to the formaldehyde generation chamber, and the catalytic carrier plate and ultraviolet light source are located in the environmental simulation chamber. The formaldehyde generation chamber is equipped with a double-layered container. The inner layer of the container holds formaldehyde solution, while the outer layer is heated by a water circulation system to generate formaldehyde gas. The environmental simulation chamber is also equipped with a temperature and humidity monitor for monitoring and controlling the temperature and humidity within the chamber. The formaldehyde detectors include an electrochemical formaldehyde detector and a photoelectric photometric formaldehyde detector. The electrochemical formaldehyde detector is used to detect high concentrations of formaldehyde gas, while the photoelectric photometric formaldehyde detector is used to test low concentrations of formaldehyde gas.

2. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, The simulated environment room is also equipped with a humidifier, which is used to regulate the humidity inside the simulated environment room.

3. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, The environmental simulation chamber has an adjustable ventilation system for simulating different airflow conditions.

4. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, The top of the environmental simulation chamber is designed with an openable, sealed cover to facilitate equipment debugging and maintenance.

5. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, The electrochemical formaldehyde detector is installed inside the environmental simulation chamber; the photoelectric formaldehyde detector is installed outside the environmental simulation chamber, and the sample inlet of the photoelectric formaldehyde detector is connected to the environmental simulation chamber through a pipeline.

6. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, An air pump is also installed on the pipeline connecting the environmental simulation chamber and the formaldehyde generation chamber to control the flow of formaldehyde gas.

7. The novel photocatalytic degradation formaldehyde testing device as described in claim 1, characterized in that, The testing device also includes a data recording system for storing and analyzing data on changes in formaldehyde concentration.

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