A VOC purification device loaded with UiO-66@AC fiber cloth

Abstract

The invention discloses a VOC purification device loaded with UiO‑66@AC fiber cloth, which comprises a dust filtering mechanism and a filter box connected thereto, wherein two symmetrically distributed sockets are arranged on the upper end of an outer wall of one side of the filter box, and UiO‑66@AC fiber cloth filter plates are respectively plugged into the two sockets, and a mounting plate is fixedly connected to an outer wall of one side of the UiO‑66@AC fiber cloth filter plate, and symmetrically distributed limiting grooves adapted to the UiO‑66@AC fiber cloth filter plate are arranged on the upper ends of inner walls on both sides of the filter box, and symmetrically distributed mounting holes are arranged at the bottom end of the filter box, and a screw rod is threadedly connected inside the mounting hole, and a limiting frame for surrounding the UiO‑66@AC fiber cloth filter plate is rotatably arranged at the top end of the screw rod, and a symmetrically distributed guide rod is fixedly connected to the bottom end of the limiting frame, and the guide rod passes through the bottom end of the filter box, and an air outlet is arranged on an outer wall of one side of the filter box. The present invention can replace the UiO‑66@AC fiber cloth grid plate without affecting work, thereby achieving continuous operation without stopping the machine, and can quickly and conveniently replace the UiO‑66@AC fiber cloth filter plate, saving time.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a VOC purification device loaded with UiO-66@AC fiber cloth. Background Art

[0002] Commercial activated carbon has a small specific surface area and is mostly a mesoporous structure with large pores, which makes it weak in retaining the dispersion force for small molecule adsorption. Combining activated carbon with the metal organic framework material UiO-66 to prepare UiO-66@AC material not only increases the specific surface area of ​​the material, but also introduces new active sites, greatly improving the adsorption performance of the material. In addition, the device in the existing patent uses many components to achieve the problem of cleaning and maintaining activated carbon without stopping the machine. The device is complex and the manufacturing cost is high, which needs to be improved. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a VOC purification device loaded with UiO-66@AC fiber cloth.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A VOC purification device loaded with UiO-66@AC fiber cloth, comprising a dust filtering mechanism and a filter box connected thereto, wherein two symmetrically distributed sockets are arranged on the upper end of an outer wall of one side of the filter box, and UiO-66@AC fiber cloth filter plates are respectively plugged into the two sockets, and a mounting plate is fixedly connected to an outer wall of one side of the UiO-66@AC fiber cloth filter plate, and symmetrically distributed limiting grooves adapted to the UiO-66@AC fiber cloth filter plate are arranged on the upper ends of both sides of the inner walls of the filter box, and symmetrically distributed mounting holes are arranged at the bottom end of the filter box, and a screw rod is threadedly connected to the inside of the mounting hole, and a limiting frame is rotatably arranged at the top end of the screw rod to surround the UiO-66@AC fiber cloth filter plate, and a symmetrically distributed guide rod is fixedly connected to the bottom end of the limiting frame, and the guide rod passes through the bottom end of the filter box, and an air outlet is arranged on an outer wall of one side of the filter box.

[0006] Furthermore, a rotating block is fixedly provided at the bottom end of the screw rod, and anti-slip grooves are provided on the outside of the rotating block.

[0007] Furthermore, the dust filtering mechanism includes a water tank, a top end of the water tank is fixedly connected with an air inlet pipe communicating therewith, and a connecting pipe communicating with each other is fixedly connected between the water tank and the filter box.

[0008] Furthermore, one end of the air inlet pipe extends to the inner lower end of the water tank, and the upper and lower ends of the outer wall of one side of the water tank are respectively provided with a water inlet pipe and a water outlet pipe connected thereto, and one end of the water inlet pipe and the water outlet pipe are both connected with end covers through threads.

[0009] Furthermore, a rectangular groove is provided on an outer wall of one side of the water tank, and an observation window is fixedly provided inside the rectangular groove.

[0010] Furthermore, a flange connection plate is fixedly provided at the other end of the air intake pipe.

[0011] Furthermore, a liquid level tube in an L shape and connected to the water tank is fixedly provided at the lower end of the outer wall on the other side of the water tank. The liquid level tube is made of transparent plastic or glass, and scale lines are provided on the outside of the liquid level tube.

[0012] The present invention adopts the above technical solution and has the following beneficial technical effects:

[0013] 1. The VOCs waste gas purification equipment used for UiO-66@AC fiber cloth adsorption adopts the new UiO-66@AC fiber cloth, which has better adsorption effect than activated carbon and is more convenient to disassemble and replace;

[0014] 2. The VOCs waste gas purification equipment for UiO-66@AC fiber cloth adsorption is provided with a screw. When the UiO-66@AC fiber cloth filter plate needs to be replaced, the screw is rotated to make it rise, so that the limit frame covers the UiO-66@AC fiber cloth filter plate, and then it can be pulled out. The structure is simple and convenient, and the UiO-66@AC fiber filter plate can be replaced without affecting the work, so as to realize continuous operation without stopping;

[0015] 3. The VOCs waste gas purification equipment used for UiO-66@AC fiber cloth adsorption can respond to the liquid level of added water in real time by being provided with a liquid level pipe, and can accurately add the required amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

[0017] Figure 1 This is a schematic diagram of the overall structure of a VOC purification device loaded with UiO-66@AC fiber cloth proposed by the present invention;

[0018] Figure 2 This is a schematic cross-sectional structure diagram of a VOC purification device loaded with UiO-66@AC fiber cloth proposed by the present invention;

[0019] Figure 3 A schematic diagram of the structure of a UiO-66@AC fiber cloth filter plate of a VOC purification device loaded with UiO-66@AC fiber cloth proposed by the present invention;

[0020] Figure 4Thermogravimetric (TG) and differential thermogravimetric (DTG) curves of UiO-66 and UiO-66@AC, where (a) is the TG curve of UiO-66 and UiO-66@AC; (b) is the DTG curve of UiO-66 and UiO-66@AC;

[0021] Figure 5 Nitrogen adsorption / desorption curves and pore size distribution of UiO-66 and UiO-66@AC, where (a) is the nitrogen adsorption / desorption curve; (b) is the pore size distribution diagram. DETAILED DESCRIPTION

[0022] Please refer to Figure 1-3 In an embodiment of the present invention, a VOC purification device loaded with UiO-66@AC fiber cloth includes a dust filter mechanism and a filter box 2 connected thereto. Two symmetrically distributed sockets are provided at the upper end of the outer wall of one side of the filter box 2. UiO-66@AC fiber cloth filter plates 3 are respectively plugged into the two sockets, that is, the UiO-66@AC fiber cloth filter plate 3 can be installed by inserting it from the socket, and it is also convenient for disassembly. A mounting plate 4 is fixedly connected to the outer wall of one side of the UiO-66@AC fiber cloth filter plate 3. The upper ends of the inner walls on both sides of the filter box 2 are provided with symmetrically distributed limiting grooves that are adapted to the UiO-66@AC fiber cloth filter plate 3. 11. The UiO-66@AC fiber cloth filter plate 3 is limited to further improve stability. The bottom end of the filter box 2 is provided with symmetrically distributed mounting holes. The inside of the mounting holes is connected with a screw 10 through a thread. The top of the screw 10 is rotatably provided with a limiting frame 9 that surrounds the UiO-66@AC fiber cloth filter plate 3. For example, the limiting frame 9 is connected to the screw 10 through a bearing. In a normal state, the top of the limiting frame 9 just contacts the bottom of the UiO-66@AC fiber cloth filter plate 3, and an airflow is blocked at the bottom of the interior of the filter box 2. The airflow will pass through the UiO-66@AC fiber cloth filter plate 3. Figure 3 As shown, when the limit frame 9 rises, it can just cover the UiO-66@AC fiber cloth filter plate 3. The bottom end of the limit frame 9 is fixedly connected with symmetrically distributed guide rods 12. The guide rods 12 pass through the bottom end of the filter box 2 to limit the UiO-66@AC fiber cloth filter plate 3 and improve stability. An air outlet is provided on the outer wall of one side of the filter box 2, and the filtered exhaust gas is discharged from the air outlet.

[0023] In the present invention, a rotating block is fixedly provided at the bottom end of the screw rod 10 , and anti-slip grooves are provided on the outside of the rotating block to facilitate the rotation of the screw rod 10 .

[0024] In the present invention, the dust filtering mechanism includes a water tank 1, in which tap water is provided, an air intake pipe 7 connected to the top of the water tank 1 is fixedly connected, and a connecting pipe connected to each other is fixedly connected between the water tank 1 and the filter box 2, and the connecting pipe is located above the water tank 1. Exhaust gas enters from the air intake pipe 7, passes into the tap water, filters impurities and dust, and then enters the filter box 2 from the connecting pipe.

[0025] In the present invention, one end of the air inlet pipe 7 extends to the inner lower end of the water tank 1, and the upper and lower ends of the outer wall of one side of the water tank 1 are respectively provided with an inlet pipe and an outlet pipe connected thereto, and one end of the inlet pipe and the outlet pipe are both connected with end caps through threads to facilitate the addition of water and the discharge of sewage.

[0026] In the present invention, a rectangular groove is provided on one side of the outer wall of the water tank 1, and an observation window 5 is fixedly provided inside the rectangular groove, so as to facilitate observation of the filtering condition of the tap water and replace the tap water with new one when the tap water is very dirty.

[0027] In the present invention, a flange connection plate 8 is fixedly provided at the other end of the air intake pipe 7 to facilitate the connection between the exhaust gas discharge pipe and the air intake pipe 7 .

[0028] In the present invention, a liquid level tube 6 connected to the water tank 1 and in an L shape is fixedly provided at the lower end of the outer wall on the other side. The liquid level tube 6 is made of transparent plastic or glass, and scale lines are provided on the outside of the liquid level tube 6, which can respond to the liquid level of the added water in real time and accurately add the required amount.

[0029] The working principle of the present invention is: add a proper amount of tap water into the water tank 1, connect the exhaust gas with the air inlet pipe 7, the exhaust gas will enter the tap water, then the impurities and dust will be filtered, the filtered gas will enter the filter box 2 from the connecting pipe, under the action of the two UiO-66@AC fiber cloth filter plates 3, the odor in the exhaust gas will be adsorbed and finally discharged from the air outlet. When we need to replace the UiO-66@AC fiber cloth filter plate 3, as shown in the figure, Figure 2 and Figure 3 As shown, assuming that the UiO-66@AC fiber cloth filter plate 3 on the left is cleaned and maintained, the corresponding screw 10 is rotated to move it upward. When the limit frame 9 rises, it can just cover the UiO-66@AC fiber cloth filter plate 3. At this time, the gas will not pass through the UiO-66@AC fiber cloth filter plate 3 on the left, and the limit frame 9 after rising. At this time, there will be airflow passing through the lower left bottom of the filter box 2, and then the UiO-66@AC fiber cloth filter plate 3 on the left is pulled out for cleaning and maintenance. After the cleaning and maintenance is completed, the UiO-66@AC fiber cloth filter plate 3 on the left is installed, and the screw 10 is reversed to move the limit frame 9 downward and reset, so that the UiO-66@AC fiber cloth filter plate 3 can be cleaned and maintained without stopping the machine. Similarly, the UiO-66@AC fiber cloth filter plate 3 on the right can be replaced.

[0030] UiO-66@AC material advantages and performance analysis data:

[0031] Figure 4 The thermogravimetric curve (TG) and differential thermogravimetric curve (DTG) of UiO-66 and UiO-66@AC show that UiO-66 has the first weight loss stage between 30 and 345℃, and the main mass loss occurs at about 65℃. The mass loss in the whole stage is 22%, which is mainly caused by the loss of water on the crystal surface and the evaporation of residual N,N-dimethylformamide solvent; the second weight loss stage appears between 345 and 600℃, and the main mass loss occurs at about 550℃. The mass loss in the whole stage is 41%, which is mainly due to the breakage of the coordination bond between the metal central ion and the organic ligand, which causes the collapse of the crystal structure. Compared with UiO-66, the curve of UiO-66@AC shows two obvious weight loss stages, and the weight loss rate is lower, which is related to the amount of activated carbon added. The greater the amount of activated carbon added, the lower the weight loss rate, because the thermal stability of activated carbon is better than that of UiO-66.

[0032] Figure 5 The nitrogen adsorption / desorption curves and pore size distribution of UiO-66 and UiO-66@AC are shown in Figure 2. Figure 5 It can be seen that at low relative pressures, the nitrogen adsorption of UiO-66 and UiO-66@AC shows a rapid upward trend. As the pressure continues to increase, the increase in nitrogen adsorption tends to be gentle, and the adsorption curve and desorption curve basically coincide, indicating that UiO-66 and UiO-66@AC have microporous structures. The DFT pore size distribution diagram also shows that the pore size distribution of UiO-66 and UiO-66@AC is mostly below 2nm, confirming that UiO-66 and UiO-66@AC are microporous materials. Due to the capillary condensation of nitrogen in the mesoporous structure, the adsorption / desorption curve will not overlap with the adsorption curve when the relative pressure is close to the saturated vapor pressure, resulting in an adsorption hysteresis loop. The nitrogen adsorption / desorption curve of activated carbon has a large adsorption hysteresis loop, indicating that there is a mesoporous structure in the activated carbon. The nitrogen adsorption / desorption curve of UiO-66@AC shows a small adsorption hysteresis loop when the relative pressure is close to the saturated vapor pressure, indicating that there are also some mesoporous structures in the UiO-66@AC series of materials. As the amount of activated carbon added increases, the area of ​​the adsorption hysteresis loop becomes larger, indicating that the existence of mesoporous structure in the UiO-66@AC material may be derived from the mesopores originally existing in the activated carbon.

[0033] The structural parameters of UiO-66 and UiO-66@AC are shown in Table 1. The BET specific surface area, total pore volume and micropore volume of UiO-66@AC material are much higher than those of activated carbon and close to those of UiO-66 material. With the increase of activated carbon addition, UiO-66@AC shows higher BET specific surface area, total pore volume and micropore volume than the raw material UiO-66. This may be because some UiO-66 crystals entered the mesoporous channels of activated carbon, forming a new microporous structure.

[0034] Table 1 Structural parameters of UiO-66, UiO-66@AC and activated carbon

[0035]

[0036] It is proved that compared with activated carbon, UiO-66@AC can greatly increase the specific surface area of ​​the material, introduce new active sites, enhance the material's adsorption performance for VOCs, and UiO-66@AC material has extremely high thermal stability. Therefore, this patent selects UiO-66@AC material as the adsorbent.

[0037] The implementation of the present invention is described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are illustrative rather than limiting the present invention. Those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A VOC purification device loaded with UiO-66@AC fiber cloth, comprising a dust filtering mechanism and a filter box connected thereto, wherein two symmetrically distributed sockets are provided at the upper end of the outer wall of one side of the filter box, and UiO-66@AC fiber cloth filter plates are respectively plugged into the two sockets, and a mounting plate is fixedly connected to the outer wall of one side of the UiO-66@AC fiber cloth filter plate, and the upper ends of the inner walls on both sides of the filter box are provided with symmetrically distributed limiting grooves adapted to the UiO-66@AC fiber cloth filter plate, and the bottom end of the filter box is provided with symmetrically distributed mounting holes, and the interior of the mounting holes is threadedly connected with a screw rod, and the top end of the screw rod is rotatably provided with a limiting frame that surrounds the UiO-66@AC fiber cloth filter plate, and the bottom end of the limiting frame is fixedly connected with symmetrically distributed guide rods, and the guide rods pass through the bottom end of the filter box, and an air outlet is provided on the outer wall of one side of the filter box.

2. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 1 is characterized in that: A rotating block is fixedly arranged at the bottom end of the screw rod, and anti-slip grooves are arranged on the outside of the rotating block.

3. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 1 is characterized in that: The dust filtering mechanism comprises a water tank, the top of the water tank is fixedly connected with an air inlet pipe communicating with the water tank, and a connecting pipe communicating with each other is fixedly connected between the water tank and the filter box.

4. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 3 is characterized in that: One end of the air inlet pipe extends to the inner lower end of the water tank, and the upper and lower ends of the outer wall of one side of the water tank are respectively provided with a water inlet pipe and a water outlet pipe connected thereto, and one end of the water inlet pipe and the water outlet pipe are both connected with end covers through threads.

5. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 3 is characterized in that: A rectangular groove is arranged on an outer wall of one side of the water tank, and an observation window is fixedly arranged inside the rectangular groove.

6. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 3 is characterized in that: A flange connection plate is fixedly arranged at the other end of the air intake pipe.

7. The VOC purification device loaded with UiO-66@AC fiber cloth according to claim 3 is characterized in that: A liquid level tube in an L shape and connected to the water tank is fixedly provided at the lower end of the outer wall on the other side of the water tank. The liquid level tube is made of transparent plastic or glass, and scale lines are provided on the outside of the liquid level tube.

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