Photocatalytic system for efficient removal of hydrogen sulfide

Abstract

The application provides a photocatalytic system for efficiently removing hydrogen sulfide, comprising a box body and a light source, a photocatalytic fiber membrane, a power system, a hydrogen sulfide detector and a filter screen arranged in the box body. The operation process of the photocatalytic system is as follows: air is filtered through the filter screen and then passes through the detector to detect the hydrogen sulfide content therein; if the hydrogen sulfide content exceeds the standard, an alarm is given and the photocatalytic fiber membrane is automatically started to process the air; and the ultraviolet lamp provides the light source, so that the catalytic purification of the hydrogen sulfide is completed.

Description

Technical Field

[0001] This invention relates to the field of photocatalysis, specifically to a highly efficient photocatalytic system for removing hydrogen sulfide. Background Technology

[0002] According to statistics on hazardous chemical accidents over the past 10 years, hydrogen sulfide poisoning in confined spaces accounts for 35% of poisoning accidents in chemical enterprises. Currently, preventing hydrogen sulfide poisoning accidents in confined spaces mainly relies on management measures. However, elevated hydrogen sulfide concentrations are difficult to detect, or by the time they are detected, it is too late for self-rescue. Furthermore, hasty rescue operations by on-site personnel can lead to the escalation of the accident due to improper procedures. Therefore, managing hydrogen sulfide poisoning in confined spaces alone is insufficient to prevent such accidents. Hydrogen sulfide treatment technologies include biological treatment, chemical treatment, porous material adsorption, and photocatalytic treatment. However, biological and chemical treatment methods are unsuitable for confined spaces due to site limitations, and adsorption methods are prone to saturation and failure. Therefore, effectively removing hydrogen sulfide from confined spaces and providing escape opportunities for personnel operating in these spaces is crucial.

[0003] Photocatalysis is a newly emerging advanced oxidation technology that has developed in recent years. It is characterized by high activity, no secondary pollution, and low cost, and shows great promise in the treatment of pollutants. The technology uses a photocatalyst as its core, leveraging sunlight to drive the photocatalyst and generate photo-generated electrons and holes. These electrons and holes are rapidly transferred to the surface of the photocatalyst and, through solvent or gas-phase adsorption, come into contact with protons or substrates, thereby degrading hydrogen sulfide into non-toxic substances.

[0004] To address the issue of limited spaces where hydrogen sulfide cannot be promptly decomposed, this project aims to design and develop a photocatalyst with high hydrogen sulfide decomposition efficiency. The project will utilize a simple, pollution-free photocatalytic technology to decompose hydrogen sulfide and develop a hydrogen sulfide monitoring, alarm, and removal technology. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a photocatalytic system for the efficient removal of hydrogen sulfide.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A highly efficient photocatalytic system for removing hydrogen sulfide includes a housing and a light source, a photocatalytic fiber membrane, a power system, a hydrogen sulfide detector, and a filter screen disposed inside the housing.

[0008] Preferably, the light source is an ultraviolet lamp with an irradiance of 20-50 μW / cm². 2 .

[0009] Preferably, the power system includes a power battery and an air extraction device.

[0010] Preferably, the detector is also equipped with an alarm device.

[0011] Preferably, the alarm indicator inside the hydrogen sulfide detector is the detection of a hydrogen sulfide gas concentration higher than 10 mg / m³. 3 The alarm is deactivated when the concentration of hydrogen sulfide gas is below 5 mg / m³. 3 .

[0012] Preferably, the photocatalytic fiber membrane has a multilayer structure and is prepared from a photocatalyst, which is CF&TiO2-In2O3-Bi2O3.

[0013] Preferably, the method for preparing the photocatalyst includes:

[0014] Sodium bismuthate, sodium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.0. Then, carbon fiber membrane CF was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3.

[0015] Preferably, the mass ratio of sodium bismuthate, sodium indium, sodium titanate and deionized water is 1.32-1.68:0.65-0.87:1.58-1.86:30-50.

[0016] Preferably, the ratio of the amount of carbon fiber membrane (CF) added to the mass of deionized water is 1:10-20.

[0017] Preferably, the concentration of sodium hydroxide is 0.1-1 mol / L.

[0018] Preferably, the reaction temperature of the reactor is 180-200℃, and the reaction time is 6-8h.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention prepares a photocatalyst capable of efficiently removing hydrogen sulfide. The catalyst is fabricated into a photocatalytic fiber membrane and then assembled into an equipment. The equipment mainly includes an integrated structure comprising a housing, an ultraviolet lamp, a photocatalytic fiber membrane, an air extraction system, a power supply (battery), a hydrogen sulfide detector, and a filter. The hydrogen sulfide detector provides real-time monitoring and alarm for hydrogen sulfide concentration. Upon alarm, the photocatalytic system is activated. Specifically, the air-powered system filters the hydrogen sulfide through the filter and then detects its content. If the concentration exceeds the limit, an alarm is triggered, and the system automatically activates to reach the photocatalytic fiber membrane for treatment. The ultraviolet lamp provides the light source, thereby completing the catalytic purification of hydrogen sulfide.

[0021] The photocatalytic fiber membrane of this invention is made by coating a carbon fiber membrane with a layer of polymetallic oxide TiO2-In2O3-Bi2O3. The polymetallic oxide is synthesized by hydrothermal reaction of carbon fiber membrane (CF) and metal salt. The resulting photocatalyst exhibits good removal efficiency for hydrogen sulfide gas. Attached Figure Description

[0022] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the highly efficient photocatalytic system for removing hydrogen sulfide prepared in Example 1 of the present invention;

[0024] Attached reference numerals: 1-box, 2-light source, 3-filter, 4-hydrogen sulfide detector, 5-photocatalytic fiber membrane, 6-power system. Detailed Implementation

[0025] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0027] The present invention will be further described below with reference to the following embodiments.

[0028] Example 1

[0029] A highly efficient photocatalytic system for removing hydrogen sulfide includes a housing 1 and a light source 2, a photocatalytic fiber membrane 5, a power system 6, a hydrogen sulfide detector 3, and a filter screen 4 disposed inside the housing 1.

[0030] The light source 2 is an ultraviolet lamp with an irradiance of 35 μW / cm². 2 The power system 6 includes a power battery and a gas extraction device. The detector 3 also has an alarm device inside. The alarm indicator inside the hydrogen sulfide detector 3 is when the concentration of hydrogen sulfide gas is detected to be higher than 10 mg / m³, and the alarm deactivation indicator is when the concentration of hydrogen sulfide gas is detected to be lower than 5 mg / m³. 3 .

[0031] The photocatalytic fiber membrane 5 has a multilayer structure and is prepared from a photocatalyst, which is CF&TiO2-In2O3-Bi2O3.

[0032] The preparation method of the photocatalyst includes:

[0033] Sodium bismuthate, sodium indium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.0. Then, carbon fiber membrane (CF) was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3. The mass ratio of sodium bismuthate, sodium indium indium, sodium titanate, and deionized water was 1.47:0.72:1.63:40, the mass ratio of carbon fiber membrane (CF) to deionized water was 1:15, the concentration of sodium hydroxide was 0.5 mol / L, the reaction temperature of the reaction vessel was 200℃, and the reaction time was 7 h.

[0034] Example 2

[0035] A highly efficient photocatalytic system for removing hydrogen sulfide includes a photocatalytic fiber membrane, which has a multilayer structure and is prepared from a photocatalyst, namely CF&TiO2-In2O3-Bi2O3.

[0036] The preparation method of the photocatalyst includes:

[0037] Sodium bismuthate, sodium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.0. Then, carbon fiber membrane (CF) was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3. The mass ratio of sodium bismuthate, sodium indium, sodium titanate, and deionized water was 1.32:0.6:1.58:30, the mass ratio of carbon fiber membrane (CF) to deionized water was 1:10, the concentration of sodium hydroxide was 0.1 mol / L, the reaction temperature of the reaction vessel was 180℃, and the reaction time was 6 h.

[0038] Example 3

[0039] A highly efficient photocatalytic system for removing hydrogen sulfide includes a photocatalytic fiber membrane, which has a multilayer structure and is prepared from a photocatalyst, namely CF&TiO2-In2O3-Bi2O3.

[0040] The preparation method of the photocatalyst includes:

[0041] Sodium bismuthate, sodium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.0. Then, carbon fiber membrane (CF) was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3. The mass ratio of sodium bismuthate, sodium indium, sodium titanate, and deionized water was 1.57:0.73:1.7:30, the mass ratio of carbon fiber membrane (CF) to deionized water was 1:16, the concentration of sodium hydroxide was 0.3 mol / L, the reaction temperature of the reaction vessel was 180℃, and the reaction time was 6 h.

[0042] Example 4

[0043] A highly efficient photocatalytic system for removing hydrogen sulfide includes a photocatalytic fiber membrane, which has a multilayer structure and is prepared from a photocatalyst, namely CF&TiO2-In2O3-Bi2O3.

[0044] The preparation method of the photocatalyst includes:

[0045] Sodium bismuthate, sodium indium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.0. Then, carbon fiber membrane (CF) was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3. The mass ratio of sodium bismuthate, sodium indium indium, sodium titanate, and deionized water was 1.68:0.87:1.86:50, the mass ratio of carbon fiber membrane (CF) to deionized water was 1:20, the concentration of sodium hydroxide was 1 mol / L, the reaction temperature of the reaction vessel was 200℃, and the reaction time was 8 h.

[0046] This invention addresses the problem of the inability to promptly decompose hydrogen sulfide when it is present in confined spaces due to location limitations. It designs and develops a photocatalyst with high hydrogen sulfide decomposition efficiency, selects a simple and pollution-free photocatalytic technology to decompose hydrogen sulfide, and develops a hydrogen sulfide monitoring, alarm, and removal technology.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A highly efficient photocatalytic system for removing hydrogen sulfide, characterized in that, Includes the housing and the light source, photocatalytic fiber membrane, power system, hydrogen sulfide detector, and filter screen installed inside the housing; The photocatalytic fiber membrane has a multilayer structure and is prepared from a photocatalyst, which is CF&TiO2-In2O3-Bi2O3. The preparation method of the photocatalyst includes: Sodium bismuthate, sodium indium, sodium titanate, and deionized water were mixed, and sodium hydroxide solution was added dropwise until the pH reached 11.0-12.

0. Then, carbon fiber membrane CF was added, stirred evenly, and poured into a reaction vessel for reaction. After the reaction was completed, the solid was collected by centrifugation, washed three times with water, and dried to obtain the desired photocatalyst CF&TiO2-In2O3-Bi2O3.

2. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The light source is an ultraviolet lamp with an irradiance of 20-50 μW / cm². 2 .

3. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The power system includes a power battery and an air extraction device.

4. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The hydrogen sulfide detector is also equipped with an alarm device.

5. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 4, characterized in that, The alarm indicator inside the hydrogen sulfide detector is when the concentration of hydrogen sulfide gas detected is higher than 10 mg / m³. 3 The alarm is deactivated when the concentration of hydrogen sulfide gas is below 5 mg / m³. 3 .

6. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The mass ratio of sodium bismuthate, sodium indium, sodium titanate, and deionized water is 1.32-1.68:0.65-0.87:1.58-1.86:30-50.

7. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The ratio of the amount of carbon fiber membrane (CF) added to the mass of deionized water is 1:10-20.

8. The photocatalytic system for efficient removal of hydrogen sulfide according to claim 1, characterized in that, The reaction temperature in the reactor is 180-200℃, and the reaction time is 6-8 hours.

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