A microplastic composite filter and a tap water microplastic filtering device

Abstract

The present invention provides a microplastic composite filter and a tap water microplastic filtration device. The filter includes an outer tube body and multiple filter layers. One end of the outer tube body is a water inlet and the other end is a water outlet. The filter layers are arranged in the outer tube body and arranged around the axis of the outer tube body. The filter layers are, from the inside to the outside, an activated carbon layer, a graphene oxide aerogel layer, a nanofiltration membrane layer, and a silver ion-loaded activated carbon layer. Liquid entering from the water inlet flows through the activated carbon layer, the graphene oxide aerogel layer, the nanofiltration membrane layer, and the silver ion-loaded activated carbon layer in sequence. The beneficial effects of the present invention are: a graphene oxide aerogel composite material is used as an adsorbent to chemically react with microplastic particles in liquids such as tap water, thereby adsorbing the microplastic particles. The large specific surface area and chemical stability of the graphene oxide aerogel greatly extend the service life of the adsorbent, far exceeding the removal effect of traditional physical filtration and chemical oxidation technologies.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid filtering and purification equipment, and in particular to a microplastic composite filter and a tap water microplastic filtering device. Background Art

[0002] Tap water is an indispensable source of water in human daily life, but with the development of human industry and lifestyle, the content of microplastics in water bodies has gradually increased. Microplastics refer to plastic particles with a diameter of less than 5mm, including tiny particles, fibers and flakes. Many water purifiers on the market use filter elements made of PP cotton, and the water pipes are made of PVC or PE. After long-term use, the material ages and is very likely to release a large number of microplastic particles. The most common microplastic particles in tap water are plastic fragments, followed by polymers such as polyethylene terephthalate (PET) and polypropylene. At present, because the water treatment system of the water purifier cannot filter out all these microplastic particles, more efficient detection technology and filtration methods need to be developed. Summary of the Invention

[0003] In view of this, in order to solve the problem of microplastic filtration in tap water, an embodiment of the present invention provides a microplastic composite filter and a tap water microplastic filtration device.

[0004] An embodiment of the present invention provides a microplastic composite filter, comprising:

[0005] An outer tube body, one end of which is a water inlet and the other end is a water outlet;

[0006] And multiple filter layers, each of the filter layers is arranged in the outer tube body and around the axis of the outer tube body, and each of the filter layers is, from the inside to the outside, an activated carbon layer, a graphene oxide aerogel layer, a nanofiltration membrane layer and a silver ion-loaded activated carbon layer. The liquid entering from the water inlet flows through the activated carbon layer, the graphene oxide aerogel layer, the nanofiltration membrane layer and the silver ion-loaded activated carbon layer in sequence, wherein the graphene oxide aerogel layer can chemically react with microplastic particles in the liquid to adsorb the microplastic particles.

[0007] Furthermore, it also includes a terminal filter membrane, which is arranged at the water outlet.

[0008] Furthermore, the graphene oxide aerogel layer is cylindrical, the activated carbon layer is filled inside the graphene oxide aerogel layer, the activated carbon layer is aligned with the water inlet, the nanofiltration membrane layer is wrapped around the activated carbon layer, and the silver ion-loaded activated carbon layer is arranged on the periphery of the nanofiltration membrane layer.

[0009] Furthermore, the nanofiltration membrane layer includes multiple layers of nanofiltration membranes, the pore size of each nanofiltration membrane decreases from the inside to the outside, and activated carbon is filled between two adjacent layers of nanofiltration membranes.

[0010] Furthermore, the nanofiltration membrane layer includes three layers of nanofiltration membranes, which are 100nm, 10nm, and 1nm nanofiltration membranes from the inside to the outside.

[0011] Furthermore, the water inlet is provided with a filter grid.

[0012] In addition, based on the above-mentioned microplastic composite filter, an embodiment of the present invention also provides a tap water microplastic filtration device, including the above-mentioned microplastic composite filter, and also including a first water inlet pipe and a first faucet, the water inlet is connected to the first water inlet pipe, and the water outlet is connected to the first faucet.

[0013] Furthermore, it also includes a first water outlet pipeline, the water outlet is connected to the water outlet pipeline, and the water outlet pipeline is connected to the first faucet.

[0014] Furthermore, it also includes a water supply pipeline, a second water inlet pipeline and a second faucet, the water supply pipeline is connected to the first water inlet pipeline and the second water inlet pipeline respectively, and the second water inlet pipeline is connected to the second faucet.

[0015] Furthermore, the water inlet is arranged downward, and the water outlet is arranged upward.

[0016] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are:

[0017] 1. The microplastic composite filter and tap water microplastic filtration device of the present invention use a graphene oxide aerogel composite material as an adsorbent, which chemically reacts with microplastic particles in liquids such as tap water to adsorb the microplastic particles. The large specific surface area and chemical stability of the graphene oxide aerogel greatly extend the service life of the adsorbent, which is far higher than the removal effect of traditional physical filtration and chemical oxidation technologies. In addition, the graphene oxide aerogel can also adsorb a variety of organic matter and heavy metal ions, and can comprehensively filter the liquid.

[0018] 2. The microplastic composite filter and tap water microplastic filtering device of the present invention filter the particles generated by adsorption of the silver ion-carrying activated carbon layer through the terminal filter membrane, further improving the filtering effect of the liquid.

[0019] 3. The microplastic composite filter and tap water microplastic filtration device of the present invention first adsorb large-sized particles in the liquid through the activated carbon layer and the graphene oxide aerogel layer, and then filter the nano-scale microplastic particles step by step through the nanofiltration membrane layer, greatly reducing the probability of large particle pollutants clogging the small-diameter nanofiltration membrane and improving the service life of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a tap water microplastic filtering device according to the present invention;

[0021] Figure 2 It is a cross-sectional view of a microplastic composite filter of the present invention.

[0022] In the figure: 1. Microplastic composite filter; 101. Outer tube body; 102. Water inlet; 103. Water outlet; 104. Activated carbon layer; 105. Graphene oxide aerogel layer; 106. Nanofiltration membrane layer; 107. Silver ion-loaded activated carbon layer; 108. Constraint grid; 109. Filter grid; 110. Terminal filter membrane; 2. First water inlet pipe; 3. First faucet; 4. First water outlet pipe; 5. Water supply pipe; 6. Second water inlet pipe; 7. Second faucet. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following describes a preferred embodiment of the present invention among multiple possible embodiments, which is intended to provide a basic understanding of the present invention but is not intended to identify the key or decisive elements of the present invention or to limit the scope of protection.

[0024] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0025] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual scale.

[0027] It should be further clarified that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0028] Please refer to Figure 1 and 2An embodiment of the present invention provides a microplastic composite filter 1 for filtering microplastic particles in a liquid. The microplastic composite filter 1 mainly includes an outer tube body 101 and multiple filter layers.

[0029] like Figure 2 As shown, the outer tube body 101 is a hollow cylindrical tube. The outer tube body 101 has smaller diameters at both ends, with one end being a water inlet 102 and the other being a water outlet 103. The water inlet 102 and water outlet 103 at both ends of the outer tube body 101 can be configured as threaded joints to facilitate connection of the outer tube body 101 to a pipeline transporting the liquid to be filtered. The larger diameter of the middle portion of the outer tube body 101 forms a space for each filter layer.

[0030] Each of the filter layers is arranged in the middle of the outer tube body 101. Each of the filter layers is arranged inside the outer tube body 101 and around the axis of the outer tube body 101. Each of the filter layers is, from the inside to the outside, an activated carbon layer 104, a graphene oxide aerogel layer 105, a nanofiltration membrane layer 106 and a silver ion-loaded activated carbon layer 107. The liquid entering from the water inlet 102 flows through the activated carbon layer 104, the graphene oxide aerogel layer 105, the nanofiltration membrane layer 106 and the silver ion-loaded activated carbon layer 107 in sequence.

[0031] Specifically, the graphene oxide aerogel layer 105 is cylindrical, the activated carbon layer 104 is filled inside the graphene oxide aerogel layer 105, the activated carbon layer 104 is aligned with the water inlet 102, the nanofiltration membrane layer 106 is wrapped around the outer periphery of the activated carbon layer 104, and the silver ion-loaded activated carbon layer 107 is arranged on the outer periphery of the nanofiltration membrane layer 106.

[0032] The activated carbon layer 104 can remove larger particles, sediments, and suspended solids from the liquid, reducing the burden on subsequent processing steps and also reducing the probability of clogging of subsequent modules. A filter grid 109 can also be provided at the water inlet 102. Liquid entering through the water inlet 102 passes through the filter grid 109 before entering the activated carbon layer 104. This filter grid 109 performs preliminary filtration and purification on the liquid, removing particles and contaminants. This specifically addresses large particles such as silt, sand, and rust, reducing the possibility of clogging subsequent filter layers.

[0033] The graphene oxide aerogel layer 105 is composed of graphene oxide aerogel filled in a filling column. The graphene oxide aerogel chemically reacts with microplastic particles in the liquid, adsorbing them. The graphene oxide aerogel has an adsorption efficiency of 90% or more for organic matter, and the adsorption effect is stable, far exceeding the removal efficiency of traditional physical filtration and chemical oxidation technologies.

[0034] The nanofiltration membrane layer 106 can filter out microscale, heavy metals, and macromolecular substances in the liquid. The nanofiltration membrane layer 106 comprises multiple layers of nanofiltration membranes, each with a decreasing pore size from the inside out, with activated carbon filled between adjacent layers. Depending on the size and morphology of the microplastic particles, a PVDF nanofiltration membrane with a pore size between 1 and 100 nm can be selected. In this embodiment, the nanofiltration membrane layer 106 comprises three layers of nanofiltration membranes: 100 nm, 10 nm, and 1 nm, from the inside out.

[0035] The silver-loaded activated carbon layer 107 removes residual microorganisms and other organic matter through physical adsorption and chemical reactions. The silver-loaded activated carbon is filled within a confinement grid 108, which is disposed outside the nanofiltration membrane layer 106. The silver-loaded activated carbon is distributed between the confinement grid 108 and the nanofiltration membrane layer 106 to form the silver-loaded activated carbon layer 107. The high specific surface area and pore structure of the activated carbon in the silver-loaded activated carbon layer 107 provide a large number of adsorption sites for microorganisms and organic matter. The attached silver ions enhance the bactericidal and antibacterial properties of the activated carbon, thereby reducing secondary pollution caused by pollutant degradation.

[0036] Preferably, the microplastic composite filter 1 further includes a terminal filter membrane 110, which is arranged at the water outlet 103. The liquid filtered through the silver ion-loaded activated carbon layer 107 passes through the terminal filter membrane 110, which can filter out tiny particles that may remain in the water. Since the silver ion-loaded activated carbon layer 107 may release particulate matter during filtration, the particle size of the particulate matter is relatively large. Here, the particles generated by adsorption of the silver ion-loaded activated carbon layer 107 can be filtered through the terminal filter membrane 110, further improving the filtering effect on the liquid. The terminal filter membrane 110 can be a 100nm PVDF nanofiltration membrane.

[0037] Also, please refer to Figure 1 Based on the above-mentioned microplastic composite filter 1, an embodiment of the present invention also provides a tap water microplastic filtering device, which can directly filter tap water. It includes the above-mentioned microplastic composite filter 1 and also includes a first water inlet pipe 2 and a first faucet 3. The water inlet 102 is connected to the first water inlet pipe 2, and the water outlet 103 is connected to the first faucet 3.

[0038] Open the first faucet 3 , and tap water enters the microplastic composite filter 1 through the first water inlet pipe 2 . The microplastic composite filter 1 filters out the microplastic particles in the tap water, and the filtered tap water flows out from the first faucet 3 .

[0039] Considering that the faucet will be at a certain distance from the microplastic composite filter 1 when actually installed, the tap water microplastic filtering device also includes a first water outlet pipe 4, the water outlet 103 is connected to the water outlet pipe, and the water outlet pipe is connected to the first faucet 3.

[0040] In addition, tap water generally needs to be filtered for microplastic particles when it is drunk by humans, but does not need to be filtered in other usage situations. The tap water microplastic filtering device also includes a water supply pipe 5, a second water inlet pipe 6 and a second faucet 7. The water supply pipe 5 is respectively connected to the first water inlet pipe 2 and the second water inlet pipe 6, and the second water inlet pipe 6 is connected to the second faucet 7.

[0041] Tap water can flow into the first water inlet pipe 2 and the second water inlet pipe 6 at the same time. When it is necessary to filter microplastic particles, the first faucet 3 is opened to obtain tap water after filtering microplastic particles; and when it is not necessary to filter microplastic particles, the second faucet 7 is opened to obtain tap water without filtering microplastic particles. This can reduce the frequency of use of the microplastic composite filter 1 and thereby extend the life of the microplastic composite filter 1.

[0042] It should be noted that when the microplastic composite filter 1 is in use, the water inlet 102 is set downward and the water outlet 103 is set upward. The outer tube body 101 is generally set vertically. The tap water to be filtered passes through the outer tube body 101 from top to top, so that the tap water is fully in contact with each filter layer, thereby improving the filtration efficiency of each filter layer.

[0043] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended for clarity and convenience in describing the technical solution. It should be understood that these terms are relative and may vary depending on usage and placement. The use of these directional terms should not limit the scope of protection claimed in this application.

[0044] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A microplastic composite filter, characterized in that: include: An outer tube body, one end of which is a water inlet and the other end is a water outlet; and a multi-layer filter layer, each of the filter layers is arranged in the outer tube body and around the axis of the outer tube body, each of the filter layers is sequentially composed of an activated carbon layer, a graphene oxide aerogel layer, a nanofiltration membrane layer and a silver ion-loaded activated carbon layer from the inside to the outside, and the liquid entering from the water inlet flows through the activated carbon layer, the graphene oxide aerogel layer, the nanofiltration membrane layer and the silver ion-loaded activated carbon layer in sequence, wherein the graphene oxide aerogel layer can chemically react with microplastic particles in the liquid to adsorb the microplastic particles; The graphene oxide aerogel layer is cylindrical, the activated carbon layer is filled inside the graphene oxide aerogel layer, the activated carbon layer is aligned with the water inlet, the nanofiltration membrane layer is wrapped around the activated carbon layer, and the silver ion-loaded activated carbon layer is arranged on the periphery of the nanofiltration membrane layer.

2. A microplastic composite filter according to claim 1, characterized in that: It also includes a terminal filter membrane, which is arranged at the water outlet.

3. The microplastic composite filter according to claim 1, characterized in that: The nanofiltration membrane layer comprises multiple layers of nanofiltration membranes, the pore sizes of the nanofiltration membranes decrease from the inside to the outside, and activated carbon is filled between two adjacent nanofiltration membrane layers.

4. A microplastic composite filter according to claim 3, characterized in that: The nanofiltration membrane layer includes three layers of nanofiltration membranes, which are 100nm, 10nm, and 1nm nanofiltration membranes from the inside to the outside.

5. The microplastic composite filter according to claim 1, characterized in that: The water inlet is provided with a filtering grid.

6. A tap water microplastic filtering device, characterized by: It comprises a microplastic composite filter as described in any one of claims 1 to 5, and also comprises a first water inlet pipe and a first faucet, wherein the water inlet is connected to the first water inlet pipe, and the water outlet is connected to the first faucet.

7. A tap water microplastic filtering device according to claim 6, characterized in that: It also includes a first water outlet pipe, the water outlet is connected to the first water outlet pipe, and the first water outlet pipe is connected to the first faucet.

8. The tap water microplastic filtering device according to claim 6, characterized in that: It also includes a water supply pipeline, a second water inlet pipeline and a second faucet, the water supply pipeline is connected to the first water inlet pipeline and the second water inlet pipeline respectively, and the second water inlet pipeline is connected to the second faucet.

9. A tap water microplastic filtering device according to any one of claims 6 to 8, characterized in that: The water inlet is arranged downward, and the water outlet is arranged upward.

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