An atmospheric gas filtration system and device

Abstract

An atmospheric gas filtration device (1) comprising a housing (2) having a rear side and a front side. The housing (2) envelopes within an inner chamber (7) at least one carbon dioxide storage media (

Description

Field of the Invention The invention relates to an atmospheric gas (for example, carbon dioxide (CO2)) filtration device. Specifically, the invention relates to an atmospheric gas (such as CO2) filtration device that functions both passively and actively, and can be connected in a modular fashion to form a larger filtration system. Background to the Invention Direct air capture (DAC) technologies extract atmospheric gases such as carbon dioxide (CO2) directly from the atmosphere at any location, unlike carbon capture which is generally carried out at the point of emissions, such as a steel plant. The atmospheric gas, such as CO2, can be permanently stored in deep geological formations or used for a variety of applications, such as, for example, low emission synthetic hydrocarbon fuel production. One of the main atmospheric gases that is sequestered currently from air is CO2. CO2 sequestration from the atmosphere has its issues, such as the high energy costs associated with removing dilute quantities of CO2 from the atmosphere. Emerging DAC technologies relying on innovative separation systems include (i) electro swing adsorption (ESA)-DAC (an electrochemical cell where a solid electrode adsorbs, for example,CO2 when negatively charged and releases it when a positive charge is applied; (ii) zeolites (their porous structure is suitable for CO2 adsorption; and (iii) passive DAC (relies on accelerating the natural process that transforms calcium hydroxide and atmospheric gas, such as CO2, into limestone). WO2022115785A1 (hereinafter the ‘785 application) describes a passive CO2 collection device which utilizes sorbent disks vertically stacked, which are optimized for contact with air for CO2 collection. These stacked sorbent disks are contained within a housing which is designed to be in a fixed position on the ground. This device is designed to have both a CO2 capture structure (encompassing a plurality of sorbent stacked disks) where CO2 is captured from ambient air and a release configuration whereby once the disks are laden with CO2 the capture structure is moved into the release configuration where the disks are sealed within the chamber and a regeneration cycle is initiated to release CO2 into chambers where it is harvested and stored (see paragraph

[0027] ). US2023046271A1 (hereinafter the ‘271 application) discloses passive direct air CO2 filtration devices. The ‘271 application discloses in one embodiment an omni-directional “wind collector”, wherein this “wind collector” includes one or more funnels or cones or truncated cones that receive atmospheric wind and channel the wind into a body of the system wherein it contacts the sorbent material to capture CO2. It is an object of the present invention to overcome at least one of the above-referenced problems. Summary of the Invention The invention described herein is a passive, direct air atmospheric gas filtration device comprising a housing that encompasses at least one atmospheric gas filter. The filter can be in the form of a series of fins in a circular configuration around a central axis (a rolodex formation of sorts) that allows contact with passive air flow, for example, wind. Further, the proposed configuration of filters does not interfere with the incoming air flow while ensuring there is sufficient contact of air with the surface of the fins in the device. The device performs both absorption and desorption of atmospheric gases, such as CO2. In one aspect, the invention is a device as described in the appended claims. In one aspect, there is provided an atmospheric gas filtration device (1) comprising a housing (2) having a rear side (30) and a front side (32), wherein the housing (2) envelopes within an inner chamber (7) at least one carbon dioxide storage media (4), a filter (10) configured to absorb atmospheric gas from air, a first ring system (20), a second ring system (22), and a third ring system (24), a slot (18) on an outer surface of the housing (2), and a plurality of valves (36a,36b) that are in fluid communication with the slot (18), wherein the plurality of valves (36a,36b) are adapted to recycle passive air and an inert gas through the device (1). In one aspect, the first ring system (20) further comprises a plurality of valves (26) configured to deliver the inert gas, such as nitrogen, to the inner chamber (7). In one aspect, the filter (10) comprises a series of fins (12) radiating outward from a central axis (14). Preferably, the fins (12) are coated with a sorbent material selected from silica, zeolites, alumina, amine-based materials, metal oxides, metal-organic frameworks (MOFs), polymers, and carbon materials (activated carbon, graphite, graphene, fullerene, carbon nanotubes, biochar, and hydrochar). In one aspect, the atmospheric gas is selected from carbon dioxide, carbon monoxide, methane, argon, and ozone. Other atmospheric gases include neon, helium, krypton, hydrogen, nitrous oxide, xenon, iodine, and ammonia. In one aspect, the inert gas is selected from nitrogen, helium, neon, and xenon. In one aspect, the atmospheric gas filtration device (1) further comprises a series of flaps (50,52) attached to the rear (30) and the front (32), respectively, of the device (1), wherein the flaps (50,52) close to create a negative pressure environment in the device (1) and permits the inert gas to purge atmospheric gas absorbed to the filter (10). Preferably, the negative pressure environment in the device (1) is reversed when the flaps (50,52) open. In one aspect, the first ring system (20), the second ring system (22), and the third ring system (24) each further comprises a connection means (28). In one aspect, the atmospheric gas filtration device (1) further comprises a chamber lining (7) between the storage media (4) and the filter (10). In one aspect, there is provided an atmospheric gas filtration array (60) comprising a plurality of the atmospheric gas filtration devices (1) described above connected together via the slot (18) and a connecting means (28). In one aspect, the atmospheric gas filtration device (1) described above or the array (60) described above is adapted for use on a vertical or near-vertical axis of a surface. Preferably, the surface is selected from a pre-existing structure, a building, a cliff-face, a hillside, a mountainside, a vehicle (such as a ship, a car, a truck, an articulated lorry, a van, etc.) and the like. In one aspect, the invention relates to a carbon dioxide filtration device (1) comprising a housing (2) having a rear side (30) and a front side (32), wherein the housing (2) envelopes within an inner chamber (7) at least one carbon dioxide storage media (4), a filter (10) configured to absorb carbon dioxide from air, a first ring system (20), a second ring system (22), and a third ring system (24), a slot (18) on an outer surface of the housing (2), and a plurality of valves (36a,36b) that are in fluid communication with the slot (18), wherein the plurality of valves (36a,36b) are adapted to recycle passive air and an inert gas through the device (1). In one aspect, the first ring system (20) further comprises a plurality of valves (26) configured to deliver the inert gas, such as nitrogen, to the inner chamber (7). In one aspect, the filter (10) comprises a series of fins (12) radiating outward from a central axis (14). Preferably, the fins (12) are coated with a sorbent material selected from silica, zeolites, alumina, amine-based materials, metal oxides, metal-organic frameworks (MOFs), polymers, and carbon materials (activated carbon, graphite, graphene, fullerene, carbon nanotubes, biochar, and hydrochar). In one aspect, the inert gas is selected from nitrogen, helium, neon, argon, and xenon. In one aspect, the carbon dioxide filtration device (1) further comprises a series offlaps (50,52) attached to the rear (30) and the front (32), respectively, of the device (1), wherein the flaps (50,52) close to create a negative pressure environment in the device (1) and permits the inert gas to purge carbon dioxide absorbed to the filter (10). In one aspect, the negative pressure environment in the device (1) is reversed when the flaps (50,52) open. In one aspect, the first ring system (20), the second ring system (22), and the third ring system (24) each further comprise a connection means (28). In one aspect, the carbon dioxide filtration device (1) further comprises a chamber lining (7) between the storage media (4) and the filter (10). In one aspect, there is provided a carbon dioxide filtration array (60) comprising a plurality of the carbon dioxide filtration device (1) described above connected together via the slot (18) and a connecting means (28). In one aspect, the carbon dioxide filtration device (1) above or the array (60) of devices (1) are adapted for use on a vertical or near-vertical axis of a surface. In one aspect, the surface is selected from a pre-existing structure, a building, a cliff-face, a hillside, a mountainside, a vehicle (such as a ship, a car, a truck, an articulated lorry, a van, etc.) and the like. Definitions In the specification, the term “modular” should be understood to mean individual parts that can be connected together to form a larger and continuous structure. In the specification, the term “rolodex” should be understood to mean a type of rotating device having fins or panels extending outward from a central axis, typically in a circular form. In the specification, the term “passive” should be understood to mean air that is drawn or pushed into the device of the claimed invention by the force of the wind. In the specification, the term “active” should be understood to mean air or gas that is drawn into and around the device of the claimed invention by a pressure circulation system. In the specification, the term “ducting network” should be understood to mean the passageways in the ring systems of the device that allow the air to pass from the inner chamber of the device when the air first enters the device, to slots at the rear of the device where the air is expelled following extraction of the atmospheric gas (such as CO2). In the specification, the term “atmospheric gas” should be understood to mean a gas found in the atmosphere of a planetary body (the Earth, the Earth’s moon, Mars, and the like) for example, argon (Ar), carbon dioxide (CO2), neon (Ne), helium (He), methane (CH4), krypton (Kr), hydrogen (H2), nitrous oxide (NO), xenon (Xe), ozone (O3), iodine (I), carbon monoxide (CO), and ammonia (NH3). The preferred atmospheric gases sequestered by the claimed invention are carbon dioxide, argon, methane, carbon monoxide, and ozone. Brief Description of the Drawings The invention will be more clearly understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings, in which:- Figure 1 is a perspective view of the rear of a device of the claimed invention. Figure 2 is an exploded view of the device of Figure 1 from the front. Figure 3 is (A) an isolated view of the device of Figure 1 showing slots at a rear of the device and (B) a cross-section view of the ring system (including the ducting network) of the device of Figure 1. Figure 4 is a perspective view of the front device of Figure 1 in modular form, without flaps shown. Figure 5 is a simple front view of ring system of Figure 1 connected together in the modular form of Figure 3. Figure 6 is a perspective view of (A) the front of the device of Claim 1 with a front cover in situ that is open and (B) the front cover in situ that is closed. Figure 7 is a perspective view of the ring system and storage media of the device of Figure 1. Detailed Description of the Drawings The present invention provides an atmospheric gas filtration device and system that can be used on any suitable surface perpendicular or otherwise to a horizontal surface. The device can be connected together to other devices in a modular form that provides the device with the ability to connect with one another in a pattern of choice, for example, a hexagonal honeycomb pattern. To reduce the cost of constructing and installing these systems, the device of the claimed invention operates at a much smaller scale than seen in industry previously, each device will be less than 1m in depth, width, and height. It is has an internal ducting network 80 (see Figure 3B) to transfer all compressed gaseous matter - rather than external piping of current DAC systems. There will be three gas transfer systems (nitrogen, atmospheric gas (such as CO2), and low pressure air), all self-contained within ring systems incorporated in the device. The ducting network 80 of each device will connect with counterpart ducting networks 80 via a connection means 28 on each device to form the system (see Figure 5). A sorbent filter system is optimised for contact with limited (passive) air flow rather than a constant delivered stream of airflow (forced airflow). This means that the new geometry of the device is much more efficient with the amount of surface area it holds compared to the volume it fills. The filter is typically a plurality of fins arranged in a circular configuration that does not hinder the air’s ability to flow, while still ensuring the air will contact the surface of the filter. The device of the claimed invention uses nitrogen (or other suitable inert gases), which is a cheap and common element that is gaseous at room temperature, to desorb atmospheric gas (such as CO2) from the filter. The device and system of the claimed invention can desorb atmospheric gas (such as CO2) from the filter at temperatures <80°C. This means that steam is no longer essential to be used as a carrier gas. Through the use of nitrogen, the ‘condensation’ part of the standard desorption process is eliminated. Condensation was previously another costly element of typical DAC, where once the atmospheric gas (such as CO2) and steam are mixed, the chamber must then cool to under 100°C to allow the steam to condense into water and separate from the atmospheric gas (such as CO2). By using nitrogen here, a standard selective membrane can be incorporated into the device where the atmospheric gas (such as CO2) passes through a membrane (later to be stored) and nitrogen is recycled. Referring now to the figures, where Figure 1 illustrates a general embodiment of a device of the present invention. Specifically, Figure 1 illustrates a perspective view of the rear of a device of the present invention, and is generally referred to by reference numeral 1. The device 1 comprises an outer housing 2 that surrounds elements of an atmospheric gas filtration system. The device 1 further comprises a plurality of storage media 4 that extend 360° around an inner lining 6 of the housing 2. The plurality of storage media 4 are covered by the inner lining 6. The inner lining 6 is typically made of a lightweight material, such as aluminium. The inner lining 6 is further covered by a chamber lining 7 that creates an inner chamber 8 (see Figure 2). The storage media 4 are sandwiched between the inner lining 6 and the housing 2. The chamber lining 7 is typically made of a material that provides strength to the structure of the device 1, for example, stainless steel. Positioned within the inner chamber 8 is a filter 10. The filter 10 comprises a plurality of fins 12 that radiate our form a central axis 14 of the filter 10. In the example shown in the Figures, the filter 10 takes the form of a circular rolodex design. The fins 12 are coated with a sorbent material that adsorbs the atmospheric gas (such as CO2) from the air being filtered. Positioned within the inner chambers, and in front of the filter 10, are three circular ring systems 20,22,24. The first ring system 20 comprise a series of valves 26 that deliver nitrogen gas into the chamber lining 7 and contacting the fins 12 of the filter 10. The second ring system 22 allows residual air within the device 1 to drain from the inner chamber 8 via a series of valves 36a to create a low-pressure environment required to allow the nitrogen to remove the atmospheric gas (such as CO2) from the filter 10. The third ring system 24 allows the nitrogen and CO2 mixture to leave the device 1 via the storage media 4 (see Figure 7). Each of the ring systems 20,22,24 have a connection means 28 comprising of three parts (one part on each the three ring systems 20,22,24) that is adapted to be in fluid communication with a series of slots 18 on the housing 2 that open out to the atmosphere. When connected directly to second device 1, the connection means 28 engage with each other (see Figure 5). The device 1 further comprises a plurality of valves 36a,36b that run through the device 1 via the ducting network 80 that connects the movement of gases from the chamber lining 7 through to the inner lining 6 and the storage media 4 (see Figures 3B,7). The valves 36a act to create a low-pressure environment by acting as a conduit for air to enter the valves 36a and enter through the second ring 22 (see arrow Z in Figure 3B). The air then moves out of the second ring 22 and into either a second device 1 in an array of devices 1 (as shown in Figure 4), or into the atmosphere through the slots 18 (see arrow X in Figure 3A). The valves 36b act to transport the nitrogen and the atmospheric gas (such as CO2) mixture (once desorbed from the filter 10) to the ducting network 80 (see Figure 3B) where the atmospheric gas (such as CO2) is transported to the storage media 4. Figures 4 and 5 illustrate how a plurality of devices 1 can be connected together via the slots 18 on the housing 2 to form a system or an array 60 of the atmospheric gas (such as CO2) filtration devices 1 of the claimed invention. By connecting the array 60 of devices 1 together via the slots 18, the flow of gas through the array of devices 1 is continuous, and forms a continuous network of contained gas. In the example shown, the array 60 takes the form of a hexagonal honeycomb pattern. At each connection between devices 1, there slots 18 have the ability to open and close. This essentially allows for each device 1 within the array 60 to depressurise individually when the slots 18 are closed, while retaining the ability to pressurise afterwards automatically. In a singular device 1, the slots 18 should remain open, in which case a series offlaps 50,52 would seal them (see Figure 6). This is to allow for a singular constant pressure system across the entire device 1. As shown in Figure 6, there is the plurality of flaps 50 at a rear 30 of the device 1 and the series offlaps 52 at a front 32 of the device 1. When the plurality offlaps 50,52 are opened, this facilitates the movement of passive air through the device 1. The valves 26,36a,36b are closed to allow the air to interact with the fins 12 of the filter 10. The atmospheric gas (such as CO2) is adsorbed onto the material coating the fins 12 on the filter. When the adsorbent material coating the fins 12 is saturated with atmospheric gas (such as CO2), the flaps 50,52 close. When the plurality offlaps 50,52 are closed, the valves 36a on the second ring system 22 are opened to create a low pressure environment within the inner chamber 8, and the inner chamber 8 within the device 1 is effectively sealed off from the outside environment, the atmospheric gas (such as CO2) is absorbed on the fins 12 of the filter 10. When the sorbent material reaches full capacity, the valves 36a on the second ring system 22 are closed, and the atmospheric gas (such as CO2) adsorbed to the sorbent material is purged via the use of an inert gas, such as nitrogen, that is released via the opening of the valves 26. The inner chambers is now in a low pressure state. In use, and to maintain pressure within the device 1, whether at the ground level or elsewhere (for example, on a building or any vertical (or near vertical) surface, and external to the device 1), there is a pump that is attached to a reservoir of nitrogen (or other inert gas) that pumps the inert gas through device 1, which would maintain pressure across the entire device 1 or array. As there are three ring systems 20,22,24 each carrying different gas mixtures (air, nitrogen / inert gas, and a mixture of nitrogen / inert gas and atmospheric gas (such as CO2), respectively), there would be three pumps overall. In the case of the nitrogen / inert gas in the first ring system 20, the pumps purpose would be to maintain a standard pressure (for example, 1 bar) so to allow the nitrogen / inert gas to flow out into the inner chamber 8 once the valves 26 on the first ring system 20 are opened. In the case of the second ring system 22, a low pressure loop (for example, 0.1 to 0.4 bar, preferably 0.2 bar) would be maintained, so to allow residual air to escape the device 1 into this loop. The residual air would be exhausted back into the outside environment afterwards via the slots 18 (see Arrow X of Figure 3A). In the case of the third ring system 24, another low pressure loop (for example, 0.1 to 0.4 bar, preferably 0.2 bar) would be maintained, so to allow the nitrogen / inert gas and the atmospheric gas (such as CO2) mix that fills the chamber 8 to escape once the valves 36b are opened (see Arrow Z in Figure 3B). The capture (adsorption) and release (desorption) of the atmospheric gas (such as CO2) in the device 1 does not occur within the ring systems 20,22,24. The inner chamber 8 that occupies the majority of the volume of the device 1 accommodates the filter 10, and subsequently this is where the atmospheric gas (such as CO2)is absorbed and desorbed. The fins 12 of the filter 10 act as a selective membrane in the same way that a membrane that would be commonly used to in the desalination of water. The gas mixture of the atmospheric gas (such as CO2) and nitrogen / inert gas would pass down through the valves 36b into the storage media 4 for storage of the atmospheric gas (such as CO2), while the released nitrogen / inert gas would be extracted into the first ring system 20 for re-circulation. The nitrogen / inert gas flows more slowly around and between the fins 12 relative to the atmospheric gas (such as CO2) which aids in separating the two gases from the chamber 8. The filter 10 can occupy any shape that balances having sufficient airflow with minimal pressure drop, along with maintaining a high surface area to allow the atmospheric gas (such as CO2)to adsorb to its surface in an efficient manner. The fins 12 extending from the centre axis 14 is only one possible implementation. The fins 12 themselves could be any material that is electromagnetically non-polar in nature so as not to interfere with the sorbent material that coats its surface. For example, silica, zeolites, alumina, amine-based materials, metal oxides, metal-organic frameworks (MOFs), polymers, and carbon materials (activated carbon, graphite, graphene, fullerene, carbon nanotubes, biochar, and hydrochar). The end of the process of extracting and storing the atmospheric gas (such as CO2) occurs by opening the valves 36b on the third ring system 24. When the valves 36b are opened, the gas mixture leaves the inner chamber 8 through the valves 36b as the gas mixture is drawn to the lower pressure environment of the third ring system 24. The inner chamber 8 is now empty of any air or flushed atmospheric gas (such as CO2), and the sorbent material of the fins 12 is depleted of atmospheric gas (such as CO2). The flaps 50,52 are now free to open, allowing passive air to enter the device 1 once again for another round of atmospheric gas (such as CO2) filtration. The advantages of the device 1 of the current invention is that it dramatically reduces the land space required to install this system as it utilises the vertical or near-vertical plane on the surfaces such as walls, or any other natural or manmade vertical or nearvertical surface. The device 1 also miniaturises the network, of ducting fortransporting the gases to be within the structure of the device 1, which allows for far greater density of devices 1 within a system, and provides a system with access to more of the available air. There are far less moving parts compared to prior systems, with only the valves 26,36a,36b and the external slots 18 being controlled to move. The filter 10 moves through the force of the air passing through. The reduction in moving parts also means that here is a drastic decrease in operational energy demand, which is a cost reduction for any user. The modular nature of the device 1 also means that it is suited to mass manufacture compared to prior systems. In the specification the terms "comprise, comprises, comprised and comprising" or any variation thereof and the terms “include, includes, included and including" or any variation thereof are considered to be totally interchangeable and they should all be afforded the widest possible interpretation and vice versa. The invention is not limited to the embodiments hereinbefore described but may be varied in both construction and detail. All publications, patents, patent applications and other references mentioned herein are hereby incorporated by reference in their entireties for all purposes as if each individual publication, patent or patent application were specifically and individually indicated to be incorporated by reference and the content thereof recited in full.

Claims

1. An atmospheric gas filtration device (1) comprising a housing (2) having a rear side (30) and a front side (32), wherein the housing (2) envelopes within an inner chamber (7) at least one carbon dioxide storage media (4), a filter (10) configured to absorb atmospheric gas from air, a first ring system (20), a second ring system (22), and a third ring system (24), a slot (18) on an outer surface of the housing (2), and a plurality of valves (36a,36b) that are in fluid communication with the slot (18), wherein the plurality of valves (36a,36b) are adapted to recycle passive air and an inert gas through the device (1).

2. The atmospheric gas filtration device (1) according to Claim 1, wherein the first ring system (20) further comprises a plurality of valves (26) configured to deliver the inert gas, such as nitrogen, to the inner chamber (7).

3. The atmospheric gas filtration device (1) according to Claim 1 or Claim 2, wherein the filter (10) comprises a series of fins (12) radiating outward from a central axis (14).

4. The atmospheric gas filtration device (1) according to Claim 3, wherein the fins (12) are coated with a sorbent material selected from silica, zeolites, alumina, amine-based materials, metal oxides, metal-organic frameworks (MOFs), polymers, and carbon materials (activated carbon, graphite, graphene, fullerene, carbon nanotubes, biochar, and hydrochar).

5. The atmospheric gas filtration device (1) of any one of the preceding claims, wherein the atmospheric gas is selected from carbon dioxide, carbon monoxide, methane, argon, and ozone.

6. The atmospheric gas filtration device (1) according to Claim 5, wherein the atmospheric gas is selected from carbon dioxide and methane.

7. The atmospheric gas filtration device (1) according to any one of the preceding claims, wherein the inert gas is selected from nitrogen, helium, neon, argon, and xenon.

8. The atmospheric gas filtration device (1) according to any one of the preceding claims, further comprising a series of flaps (50,52) attached to the rear (30) and the front (32), respectively, of the device (1), wherein the flaps (50,52) close to create anegative pressure environment in the device (1) and permits the inert gas to purge atmospheric gas absorbed to the filter (10).

9. The atmospheric gas filtration device (1) according to Claim 8, wherein the negative pressure environment in the device (1) is reversed when the flaps (50,52) open.

10. The atmospheric gas filtration device (1) according to any one of the preceding claims, wherein the first ring system (20), the second ring system (22), and the third ring system (24) each further comprise a connection means (28).

11. The atmospheric gas filtration device (1) according to any one of the preceding claims, further comprising a chamber lining (7) between the storage media (4) and the filter (10).

12. A atmospheric gas filtration array (60) comprising a plurality of the atmospheric gas filtration device (1) of Claim 1 connected together via the slot (18) and a connecting means (28).

13. The atmospheric gas filtration device (1) of Claim 1 or the array (60) of Claim 12 adapted for use on a vertical or near-vertical axis of a surface.

14. The use of Claim 13, wherein the surface is selected from a pre-existing structure, a building, a cliff-face, a hillside, a mountainside, a vehicle (such as a ship, a car, a truck, an articulated lorry, a van, etc.) and the like.27 01 25AMENDMENTS TO THE CLAIMS HAVE BEEN FILED AS FOLLOWS:-Claims1. A passive atmospheric gas filtration device (1) comprising a housing (2) having a rear side (30) and a front side (32), wherein the housing (2) envelopes an inner chamber (7) that accommodates at least one atmospheric gas storage media (4), a filter (10) comprising a series of fins (12) radiating outward from a central axis (14) and configured to absorb atmospheric gas from air, a first ring system (20), a second ring system (22), and a third ring system (24); wherein the housing (2) further comprises a slot (18) on an outer surface of the housing (2), and a plurality of valves (36a,36b) that are in fluid communication with the slot (18), wherein the plurality of valves (36a,36b) are adapted to passively recycle air and / or an inert gas through the device (1).

2. The passive atmospheric gas filtration device (1) according to Claim 1, wherein the first ring system (20) further comprises a plurality of valves (26) configured to deliver the inert gas to the inner chamber (7).

3. The passive atmospheric gas filtration device (1) according to Claims 1 or 2, wherein the fins (12) are coated with a sorbent material selected from silica, zeolites, alumina, amine-based materials, metal oxides, metal-organic frameworks (MOFs), polymers, and carbon materials (activated carbon, graphite, graphene, fullerene, carbon nanotubes, biochar, and hydrochar).

4. The passive atmospheric gas filtration device (1) of any one of the preceding claims, wherein the atmospheric gas is selected from carbon dioxide, carbon monoxide, methane, argon, and ozone.

5. The passive atmospheric gas filtration device (1) according to Claim 4, wherein the atmospheric gas is selected from carbon dioxide and methane.

6. The passive atmospheric gas filtration device (1) according to any one of the preceding claims, wherein the inert gas is selected from nitrogen, helium, neon, argon, and xenon.

7. The passive atmospheric gas filtration device (1) according to any one of the preceding claims, further comprising a series of flaps (50,52) attached to the rear (30) and the front (32), respectively, of the device (1), wherein the flaps (50,52) close to create27 01 25a negative pressure environment in the device (1) and permits the inert gas to purge atmospheric gas absorbed to the filter (10).

8. The passive atmospheric gas filtration device (1) according to Claim 7, wherein the negative pressure environment in the device (1) is reversed when the flaps (50,52) open.

9. The passive atmospheric gas filtration device (1) according to any one of the preceding claims, wherein the first ring system (20), the second ring system (22), and the third ring system (24) each further comprise a connection means (28).

10. The passive atmospheric gas filtration device (1) according to any one of the preceding claims, further comprising a chamber lining (7) between the storage media (4) and the filter (10).

11. A passive atmospheric gas filtration array (60) comprising a plurality of the atmospheric gas filtration device (1) of Claim 1 connected together via the slot (18) and a connecting means (28).

12. The passive atmospheric gas filtration device (1) of Claim 1 or the array (60) of Claim 11 adapted for use on a vertical or near-vertical axis of a surface.

13. The use of Claim 12, wherein the surface is selected from a pre-existing structure, a building, a cliff-face, a hillside, a mountainside, and a vehicle (such as a ship, a car, a truck, an articulated lorry, a van, etc.).

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