VOCs adsorbent based on ZMQ-1 molecular sieve as well as preparation method and application of VOCs adsorbent

Abstract

The invention discloses a VOCs adsorbent based on a ZMQ-1 molecular sieve and a preparation method and application thereof, and belongs to the technical field of VOCs adsorbents, the VOCs adsorbent comprises gel inner core particles, ZMQ-1 molecular sieve pellets and an outer protection layer; after the gel inner core particles are treated by a surface modifier, the surfaces of the gel inner core particles are coated with ZMQ-1 molecular sieve pellets; the gel inner core particles and the ZMQ-1 molecular sieve pellets are coated with the outer protective layer; the gel inner core particles are prepared from fly ash and a calcium alginate solution with the concentration of 3-5%; the outer protection layer is prepared from the following raw materials in parts by weight: 12.6 to 14.3 parts of poly (N-isopropylacrylamide), 13.1 to 15.5 parts of starch and 4 to 5.3 parts of sodium dodecyl benzene sulfonate. Through combination of different adsorption characteristics of the gel inner core particles, the ZMQ-1 molecular sieve pellets and the protective layer, the adsorption capacity is synergistically enhanced. The VOCs adsorbent based on the ZMQ-1 molecular sieve has good purification performance on formaldehyde and toluene. After being recycled for five times, the adsorbent still can maintain a relatively high adsorption and purification effect on formaldehyde and methylbenzene.

Description

Technical Field

[0001] The present invention relates to the technical field of VOCs adsorbents, and in particular to a VOCs adsorbent based on ZMQ-1 molecular sieve, and a preparation method and application thereof. Background Art

[0002] VOCs adsorbents are materials used to adsorb and remove VOCs from the air. Molecular sieves have regular pores and pore size distributions, and can selectively adsorb VOCs of different molecular sizes based on their pore size.

[0003] ZMQ-1 molecular sieve is a new type of aluminosilicate molecular sieve with stable structure and intrinsic mesopores. This molecular sieve has high thermal and hydrothermal stability, abundant Br acid sites and medium to high Br acid strength.

[0004] At present, there is little research on ZMQ-1 molecular sieve. How to use ZMQ-1 molecular sieve to prepare a VOCs adsorbent with high recycling performance and excellent adsorption performance is a technical problem that the present invention needs to solve.

[0005] Based on this, the present invention designs a VOCs adsorbent based on ZMQ-1 molecular sieve and its preparation method and application to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a VOCs adsorbent based on ZMQ-1 molecular sieve, and a preparation method and application thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A VOCs adsorbent based on ZMQ-1 molecular sieve, comprising gel core particles, ZMQ-1 molecular sieve beads and an outer protective layer;

[0009] The gel core particles are treated with a surface modifier and then coated with ZMQ-1 molecular sieve beads;

[0010] The outer protective layer is coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads;

[0011] The gel core particles are prepared by using fly ash and a calcium alginate solution with a concentration of 3-5%.

[0012] The outer protective layer comprises the following raw materials in parts by weight: 12.6 to 14.3 parts of poly(N-isopropylacrylamide), 13.1 to 15.5 parts of starch, and 4 to 5.3 parts of sodium dodecylbenzenesulfonate.

[0013] Furthermore, the preparation method of the gel core particles is: adding fly ash to calcium alginate solution, stirring and mixing for 15 to 30 minutes, adding calcium chloride solution with a concentration of 0.2 to 0.4 mol / L to form gel core particles, and then aging at 30 to 35° C. for 5 to 10 hours.

[0014] Furthermore, the particle size of the gel core particles is 3 to 5 times the particle size of the ZMQ-1 molecular sieve beads.

[0015] Furthermore, the ZMQ-1 molecular sieve pellets are obtained by compounding the ZMQ-1 molecular sieve and a binder.

[0016] Furthermore, the binder is silica sol.

[0017] Furthermore, the particle size of the ZMQ-1 molecular sieve beads is 2.5 to 3.7 mm.

[0018] In order to better achieve the purpose of the present invention, the present invention also provides a method for preparing a VOCs adsorbent based on ZMQ-1 molecular sieve, comprising the following steps:

[0019] 1. Preparation of gel core particles: Add 5-8 parts of fly ash to 20-35 parts of 3-5% calcium alginate solution, stir and mix for 15-30 minutes, add 5-13 parts of 0.2-0.4 mol / L calcium chloride solution dropwise to form gel core particles, and then age at 30-35°C for 5-10 hours;

[0020] 2. The gel core particles are treated with a surface modifier;

[0021] 3. Preparation of ZMQ-1 molecular sieve pellets: 5-15 parts of ZMQ-1 molecular sieve and 3-5 parts of binder are mixed, rolled into balls, and dried at 108-145°C for 2-4 hours. The particle size of the ZMQ-1 molecular sieve pellets is 2.5-3.7 mm.

[0022] 4. Prepare the outer protective layer mixture: Mix 13.1-15.5 parts of starch with 5-10 times the volume of water, add 4-5.3 parts of sodium dodecylbenzene sulfonate under 40-45°C water bath conditions, then cool to 30-32°C, slowly add 12.6-14.3 parts of poly (N-isopropylacrylamide), and stir for 1-2 hours to obtain the outer protective layer mixture;

[0023] 5. Take 5 to 10 parts of the gel core particles and place them in 20 to 25 parts of the outer protective layer mixture for 2 to 5 seconds. After taking out the gel core particles, mix them with an excess amount of ZMQ-1 molecular sieve beads so that the surface of the gel core particles is coated with the ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture is reserved. Then, take out the coated ZMQ-1 molecular sieve beads and dry them at 78 to 85°C for 1 to 2 hours to obtain coated spheres.

[0024] 6. Then, the spheres are impregnated with the remaining outer protective layer mixture for 25 to 40 minutes, and then dried at 60 to 80° C. for 1 to 2 hours. The outer protective layer is coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0025] Furthermore, in step 2, the gel core particles are placed in a steam generator, and steam at 105-110° C. is introduced to treat the particles in the steam environment for 2-5 minutes, so that the surface of the gel core particles is fully activated.

[0026] In order to better achieve the purpose of the present invention, the present invention also provides a VOCs adsorbent based on ZMQ-1 molecular sieve obtained according to the preparation method.

[0027] In order to better achieve the purpose of the present invention, the present invention also provides an application of a VOCs adsorbent based on ZMQ-1 molecular sieve in the purification of formaldehyde and toluene.

[0028] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses an outer protective layer mixture to penetrate between the gel core particles and the ZMQ-1 molecular sieve beads, forming an inner protective layer at the gap between them and achieving bonding, and forming an outer protective layer on the outside of the gel core particles and the ZMQ-1 molecular sieve beads. The protective layer is a composite network structure and has adsorption characteristics. By combining the different adsorption characteristics of the gel core particles, the ZMQ-1 molecular sieve beads and the protective layer, a synergistic enhancement of adsorption capacity is achieved. The VOCs adsorbent based on ZMQ-1 molecular sieve of the present invention has good purification performance for formaldehyde and toluene. The VOCs adsorbent based on ZMQ-1 molecular sieve of the present invention can still maintain a high adsorption purification effect on formaldehyde and toluene after being recycled 5 times. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] Example 1: In some embodiments, a VOCs adsorbent based on ZMQ-1 molecular sieve includes gel core particles, ZMQ-1 molecular sieve beads, and an outer protective layer; the particle size of the gel core particles is 5 times the particle size of the ZMQ-1 molecular sieve beads;

[0031] The preparation method of a VOCs adsorbent based on ZMQ-1 molecular sieve comprises the following steps:

[0032] Preparation of gel core particles: 5 parts of fly ash were added to 35 parts of a 3% calcium alginate solution, stirred for 30 minutes, and 5 parts of a 0.4 mol / L calcium chloride solution were added dropwise to form gel core particles, which were then aged at 30°C for 10 hours.

[0033] 2. Surface modifier treatment of the gel core particles: The gel core particles were placed in a steam generator and steam at 105°C was introduced to treat the particles in the steam environment for 2 minutes to fully activate the surface of the gel core particles and generate more active sites on the surface of the gel core particles, which is conducive to better bonding with the ZMQ-1 molecular sieve beads in the future;

[0034] 3. Preparation of ZMQ-1 molecular sieve pellets: 5 parts of ZMQ-1 molecular sieve and 5 parts of silica sol were mixed, rolled into balls, and dried at 108°C for 4 hours. The particle size of the ZMQ-1 molecular sieve pellets was 2.5 mm. The ZMQ-1 molecular sieve was prepared using the method disclosed in Chinese invention patent CN118515294 A.

[0035] 4. Prepare the outer protective layer mixture: Mix 13.1 parts of starch with 10 times the volume of water, add 5.3 parts of sodium dodecylbenzenesulfonate in a 40°C water bath, then cool to 30°C, slowly add 14.3 parts of poly(N-isopropylacrylamide), and stir for 1 hour to obtain the outer protective layer mixture;

[0036] 5. Take 5 parts of the gel core particles and place them in 25 parts of the outer protective layer mixture for 2 seconds. After taking out the gel core particles, mix them with an excess amount of ZMQ-1 molecular sieve beads so that the surface of the gel core particles is coated with the ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture is reserved. Then, take out the coated ZMQ-1 molecular sieve beads and dry them at 85°C for 1 hour to obtain coated spheres.

[0037] 6. The spheres were then impregnated with the remaining outer protective layer mixture for 25 minutes and then dried at 60°C for 1 hour. The dense outer protective layer was coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0038] The outer protective layer mixed solution penetrates into the gap between the gel inner core particles and the ZMQ-1 molecular sieve small balls, forms an inner protective layer and realizes bonding at the gap, and forms an outer protective layer on the outside of the gel inner core particles and the ZMQ-1 molecular sieve small balls. The protective layer has a composite network structure and has adsorption properties. The adsorption properties of the gel inner core particles, the ZMQ-1 molecular sieve small balls and the protective layer are combined, and the outer protective layer has a unique heat sensitivity, which can adjust the pore structure according to the temperature change, thereby realizing the synergistic enhancement of the adsorption capacity.

[0039] In some embodiments, a ZMQ-1 molecular sieve-based VOCs adsorbent includes gel inner core particles, ZMQ-1 molecular sieve small balls and an outer protective layer; the particle size of the gel inner core particles is 3 times the particle size of the ZMQ-1 molecular sieve small balls.

[0040] A preparation method of a ZMQ-1 molecular sieve-based VOCs adsorbent includes the following steps:

[0041] I. Preparation of gel inner core particles: 8 parts of fly ash are added to 20 parts of a calcium alginate solution with a concentration of 5%, stirred and mixed for 15 min, and 13 parts of a calcium chloride solution with a concentration of 0.2 mol / L is added dropwise to form gel inner core particles, which are then aged at 35°C for 5h;

[0042] II. Surface modifier treatment of the gel inner core particles: the gel inner core particles are placed in a steam generator and treated in a steam environment for 2 min by passing in steam at 110°C to fully activate the surface of the gel inner core particles;

[0043] III. Preparation of ZMQ-1 molecular sieve small balls: 15 parts of ZMQ-1 molecular sieve and 3 parts of silica sol are mixed and rolled into balls, which are then dried at 145°C for 2h, and the particle size of the ZMQ-1 molecular sieve small balls is 3.7mm;

[0044] IV. Preparation of an outer protective layer mixed solution: 15.5 parts of starch are mixed with 5 times the volume of water, 4 parts of sodium dodecyl benzene sulfonate is added under the condition of a 45°C water bath, then the temperature is lowered to 32°C, 12.6 parts of poly(N-isopropyl acrylamide) is slowly added, and stirred and mixed for 2h to obtain the outer protective layer mixed solution;

[0045] V. 10 parts of the gel inner core particles are placed in 20 parts of the outer protective layer mixed solution for 5s, and then the gel inner core particles are taken out and mixed with excess ZMQ-1 molecular sieve small balls to coat the surface of the gel inner core particles with the ZMQ-1 molecular sieve small balls. The remaining outer protective layer mixed solution is reserved for use. Then, the coated ZMQ-1 molecular sieve small balls are taken out and dried at 78°C for 2h to obtain the coated balls;

[0046] 6. The spheres were then impregnated with the remaining outer protective layer mixture for 40 minutes and then dried at 80°C for 2 hours. The outer protective layer was coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0047] Example 3: In some embodiments, a VOCs adsorbent based on ZMQ-1 molecular sieve includes gel core particles, ZMQ-1 molecular sieve beads, and an outer protective layer; the particle size of the gel core particles is 4 times the particle size of the ZMQ-1 molecular sieve beads;

[0048] The preparation method of a VOCs adsorbent based on ZMQ-1 molecular sieve comprises the following steps:

[0049] Preparation of gel core particles: 6 parts fly ash was added to 25 parts of a 4% calcium alginate solution, stirred for 20 minutes, and 8 parts of a 0.3 mol / L calcium chloride solution was added dropwise to form gel core particles, which were then aged at 32°C for 6 hours.

[0050] 2. Surface modifier treatment of the gel core particles: placing the gel core particles in a steam generator, introducing 107°C steam and subjecting the particles to treatment in the steam environment for 3 minutes to fully activate the surface of the gel core particles;

[0051] 3. Preparation of ZMQ-1 molecular sieve pellets: 8 parts of ZMQ-1 molecular sieve and 4 parts of silica sol were mixed, rolled into balls and dried at 125°C for 3 hours. The particle size of the ZMQ-1 molecular sieve pellets was 2.7 mm.

[0052] 4. Prepare the outer protective layer mixture: Mix 14 parts of starch with 6 times the volume of water, add 4.5 parts of sodium dodecylbenzenesulfonate in a 42°C water bath, then cool to 31°C, slowly add 13 parts of poly(N-isopropylacrylamide), and stir for 1.2 hours to obtain the outer protective layer mixture;

[0053] 5. Take 6 parts of the gel core particles and place them in 22 parts of the outer protective layer mixture for 3 seconds. After taking out the gel core particles, mix them with an excess of ZMQ-1 molecular sieve beads so that the surface of the gel core particles is coated with ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture is reserved for later use. Then, take out the coated ZMQ-1 molecular sieve beads and dry them at 80°C for 1.2 hours to obtain coated spheres;

[0054] 6. The spheres were then impregnated with the remaining outer protective layer mixture for 30 minutes and then dried at 70°C for 1.5 hours. The outer protective layer was coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0055] Example 4: In some embodiments, a VOCs adsorbent based on ZMQ-1 molecular sieve includes gel core particles, ZMQ-1 molecular sieve beads, and an outer protective layer; the particle size of the gel core particles is 3.5 times the particle size of the ZMQ-1 molecular sieve beads;

[0056] The preparation method of a VOCs adsorbent based on ZMQ-1 molecular sieve comprises the following steps:

[0057] Preparation of gel core particles: 7 parts fly ash was added to 30 parts of a 4.5% calcium alginate solution, stirred for 22 minutes, and 11 parts of a 0.3 mol / L calcium chloride solution was added dropwise to form gel core particles, which were then aged at 33°C for 8 hours.

[0058] 2. Surface modifier treatment of the gel core particles: The gel core particles were placed in a steam generator and steam at 107°C was introduced to treat the particles in the steam environment for 4 minutes to fully activate the surface of the gel core particles;

[0059] 3. Preparation of ZMQ-1 molecular sieve pellets: 7 parts of ZMQ-1 molecular sieve and 4 parts of silica sol were mixed, rolled into balls and dried at 130°C for 3.5 hours. The particle size of the ZMQ-1 molecular sieve pellets was 3.2 mm.

[0060] 4. Preparation of an outer protective layer mixture: Mix 13.5 parts of starch with 7 times the volume of water, add 5 parts of sodium dodecylbenzenesulfonate in a 42°C water bath, then cool to 30°C, slowly add 12.8 parts of poly(N-isopropylacrylamide), and stir for 1.3 hours to obtain an outer protective layer mixture;

[0061] 5. Take 8 parts of the gel core particles and place them in 21 parts of the outer protective layer mixture for 4 seconds. After taking out the gel core particles, mix them with an excess amount of ZMQ-1 molecular sieve beads to coat the surface of the gel core particles with the ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture is reserved. Then, take out the coated ZMQ-1 molecular sieve beads and dry them at 80°C for 1.2 hours to obtain coated spheres.

[0062] 6. The spheres were then impregnated with the remaining outer protective layer mixture for 32 minutes and then dried at 65°C for 1.6 hours. The outer protective layer was coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0063] Comparative Example 1: (lack of outer protective layer)

[0064] A VOCs adsorbent based on ZMQ-1 molecular sieve, comprising gel core particles and ZMQ-1 molecular sieve beads; the particle size of the gel core particles is 3.5 times that of the ZMQ-1 molecular sieve beads;

[0065] The preparation method of a VOCs adsorbent based on ZMQ-1 molecular sieve comprises the following steps:

[0066] Preparation of gel core particles: 7 parts fly ash was added to 30 parts of a 4.5% calcium alginate solution, stirred for 22 minutes, and 11 parts of a 0.3 mol / L calcium chloride solution was added dropwise to form gel core particles, which were then aged at 33°C for 8 hours.

[0067] 2. Surface modifier treatment of the gel core particles: The gel core particles were placed in a steam generator and steam at 107°C was introduced to treat the particles in the steam environment for 4 minutes to fully activate the surface of the gel core particles;

[0068] 3. Preparation of ZMQ-1 molecular sieve pellets: 7 parts of ZMQ-1 molecular sieve and 4 parts of silica sol were mixed, rolled into balls and dried at 130°C for 3.5 hours. The particle size of the ZMQ-1 molecular sieve pellets was 3.2 mm.

[0069] 4. Take 8 parts of gel core particles and put them into 21 parts of silica sol for 4 seconds. Take out the gel core particles and mix them with excess ZMQ-1 molecular sieve beads so that the surface of the gel core particles is coated with ZMQ-1 molecular sieve beads. Then take out the coated ZMQ-1 molecular sieve beads and dry them at 80°C for 1.2 hours.

[0070] Comparative Example 2: (Gel core particles not treated with surface modifier)

[0071] A VOCs adsorbent based on ZMQ-1 molecular sieve, comprising gel core particles, ZMQ-1 molecular sieve beads, and an outer protective layer; the particle size of the gel core particles is 3.5 times that of the ZMQ-1 molecular sieve beads;

[0072] The preparation method of a VOCs adsorbent based on ZMQ-1 molecular sieve comprises the following steps:

[0073] Preparation of gel core particles: 7 parts fly ash was added to 30 parts of a 4.5% calcium alginate solution, stirred for 22 minutes, and 11 parts of a 0.3 mol / L calcium chloride solution was added dropwise to form gel core particles, which were then aged at 33°C for 8 hours.

[0074] 2. Preparation of ZMQ-1 molecular sieve pellets: 7 parts of ZMQ-1 molecular sieve and 4 parts of silica sol were mixed, rolled into balls and dried at 130°C for 3.5 hours. The particle size of the ZMQ-1 molecular sieve pellets was 3.2 mm.

[0075] 3. Preparation of an outer protective layer mixture: 13.5 parts of starch were mixed with 7 times the volume of water, 5 parts of sodium dodecylbenzenesulfonate were added in a 42°C water bath, and then the temperature was lowered to 30°C. 12.8 parts of poly(N-isopropylacrylamide) were slowly added and stirred for 1.3 hours to obtain an outer protective layer mixture;

[0076] Fourth, 8 parts of the gel core particles were placed in 21 parts of the outer protective layer mixture for 4 seconds. The gel core particles were taken out and mixed with an excess of ZMQ-1 molecular sieve beads to coat the surface of the gel core particles with ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture was reserved. The coated ZMQ-1 molecular sieve beads were then taken out and dried at 80°C for 1.2 hours to obtain coated spheres.

[0077] 5. The spheres were then impregnated with the remaining outer protective layer mixture for 32 minutes and then dried at 65°C for 1.6 hours. The outer protective layer was coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

[0078] Experimental Example 1: The purification performance of the VOCs adsorbents prepared in Examples 1 to 3 and Comparative Examples 1 and 2 for formaldehyde and toluene was tested according to JC / T 1074-2008. The results are shown in Table 1.

[0079] Table 1 Static adsorption capacity of VOCs adsorbents for organic matter

[0080]

[0081] It can be seen from Table 1 that the VOCs adsorbent based on ZMQ-1 molecular sieve of the present invention has good purification performance for formaldehyde and toluene.

[0082] Experimental Example 2: Analysis of the performance of the recycled VOCs adsorbent: After recycling the VOCs adsorbent for adsorbing formaldehyde and toluene five times, the purification performance of the formaldehyde and toluene was tested according to JC / T 1074-2008. The results are shown in Table 2.

[0083] Table 2 Purification performance of VOCs adsorbent for formaldehyde and toluene after 5 cycles

[0084] project 24h formaldehyde decomposition rate% 24h toluene decomposition rate% Example 4 81.2 79.6 Comparative Example 1 32.5 30.1 Comparative Example 2 58.9 42.8

[0085] It can be seen from Table 2 that the VOCs adsorbent based on ZMQ-1 molecular sieve of the present invention can still maintain a high adsorption and purification effect on formaldehyde and toluene after being recycled for 5 times.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A VOCs adsorbent based on ZMQ-1 molecular sieve, characterized in that: It includes gel core particles, ZMQ-1 molecular sieve beads and an outer protective layer; The gel core particles are treated with a surface modifier and then coated with ZMQ-1 molecular sieve beads; The outer protective layer is coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads; The gel core particles are prepared by using fly ash and a calcium alginate solution with a concentration of 3-5%. The outer protective layer comprises the following raw materials in parts by weight: 12.6 to 14.3 parts of poly(N-isopropylacrylamide), 13.1 to 15.5 parts of starch, and 4 to 5.3 parts of sodium dodecylbenzenesulfonate.

2. The VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 1, characterized in that: The preparation method of the gel core particles is as follows: adding fly ash to calcium alginate solution, stirring and mixing for 15 to 30 minutes, dropping a calcium chloride solution with a concentration of 0.2 to 0.4 mol / L to form gel core particles, and then aging at 30 to 35° C. for 5 to 10 hours.

3. The VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 2, characterized in that: The particle size of the gel core particles is 3 to 5 times that of the ZMQ-1 molecular sieve beads.

4. The VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 3, characterized in that: The ZMQ-1 molecular sieve pellets are obtained by compounding the ZMQ-1 molecular sieve and a binder.

5. The VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 4, characterized in that: The binder is silica sol.

6. The VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 5, characterized in that: The particle size of ZMQ-1 molecular sieve beads is 2.5 to 3.7 mm.

7. A method for preparing a VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 6, characterized in that: The following steps are involved:

1. Preparation of gel core particles: Add 5-8 parts of fly ash to 20-35 parts of 3-5% calcium alginate solution, stir and mix for 15-30 minutes, add 5-13 parts of 0.2-0.4 mol / L calcium chloride solution dropwise to form gel core particles, and then age at 30-35°C for 5-10 hours; 2. The gel core particles are treated with a surface modifier; 3. Preparation of ZMQ-1 molecular sieve pellets: 5-15 parts of ZMQ-1 molecular sieve and 3-5 parts of binder are mixed, rolled into balls, and dried at 108-145°C for 2-4 hours. The particle size of the ZMQ-1 molecular sieve pellets is 2.5-3.7 mm.

4. Prepare the outer protective layer mixture: Mix 13.1-15.5 parts of starch with 5-10 times the volume of water, add 4-5.3 parts of sodium dodecylbenzene sulfonate under 40-45°C water bath conditions, then cool to 30-32°C, slowly add 12.6-14.3 parts of poly (N-isopropylacrylamide), and stir for 1-2 hours to obtain the outer protective layer mixture; 5. Take 5 to 10 parts of the gel core particles and place them in 20 to 25 parts of the outer protective layer mixture for 2 to 5 seconds. After taking out the gel core particles, mix them with an excess amount of ZMQ-1 molecular sieve beads so that the surface of the gel core particles is coated with the ZMQ-1 molecular sieve beads. The remaining outer protective layer mixture is reserved. Then, take out the coated ZMQ-1 molecular sieve beads and dry them at 78 to 85°C for 1 to 2 hours to obtain coated spheres.

6. Then, the spheres are impregnated with the remaining outer protective layer mixture for 25 to 40 minutes, and then dried at 60 to 80° C. for 1 to 2 hours. The outer protective layer is coated on the outside of the gel core particles and the ZMQ-1 molecular sieve beads.

8. The method for preparing a VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 7, characterized in that: In step 2, the gel core particles are placed in a steam generator, and steam at 105-110° C. is introduced to treat the particles in the steam environment for 2-5 minutes, so that the surface of the gel core particles is fully activated.

9. A VOCs adsorbent based on ZMQ-1 molecular sieve obtained according to the preparation method of claim 8.

10. Use of the VOCs adsorbent based on ZMQ-1 molecular sieve according to claim 9 in the purification of formaldehyde and toluene.

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