X-MCM-41 mesoporous molecular sieve microsphere adsorbent as well as forming method and application thereof

Abstract

The invention discloses an X-MCM-41 mesoporous molecular sieve microsphere adsorbent as well as a forming method and application thereof, and provides a technology for preparing a 40-60-mesh microsphere adsorbent through atomization purging forming by taking attapulgite and sesbania gum as composite binders in order to solve the forming problem of application of X-MCM-41 molecular sieve powder in products such as sanitary napkins and urinal pads. Comprising the following steps: preparing X-MCM-41 mesoporous molecular sieve powder, namely preparing the X-MCM-41 mesoporous molecular sieve powder, attapulgite, sesbania powder and water into atomized slurry; green microspheres are obtained by controlling atomization parameters; and carrying out programmed heating, constant-humidity drying and roasting under specific conditions to obtain a final product. The core contradiction that mechanical strength (toughness and hardness) and a mesoporous structure (specific surface) are difficult to consider in X-MCM-41 forming is solved. The obtained microsphere adsorbent is high in strength, low in pulverization rate and high in specific surface area retention rate, can be directly applied to personal care products, efficiently adsorbs pungent smell molecules such as ammonia gas, trimethylamine and hydrogen sulfide, and improves the comfort and safety of the products.

Description

Technical Field

[0001] This invention relates to the field of advanced adsorption material preparation and molding technology, specifically to X-MCM-41 mesoporous molecular sieve microsphere adsorbent, its molding method, and its application. Background Technology

[0002] X-MCM-41 molecular sieve powder, obtained through metal ion exchange modification, exhibits excellent adsorption performance for malodorous gases produced by human metabolism, such as ammonia, trimethylamine, and hydrogen sulfide, and has great potential for application in personal care products such as sanitary napkins and diapers.

[0003] However, powdered adsorbent materials have significant drawbacks in practical product applications: they are prone to leakage from products, may cause discomfort upon skin contact, and tend to migrate and aggregate in liquid environments, leading to a decrease in adsorption efficiency. Therefore, it is necessary to mold powder materials into macroscopic particles. Traditional tableting and crushing methods produce particles with sharp edges, which contradicts the requirements for skin comfort; while extrusion and rounding methods are difficult to efficiently produce fine particles of 40-60 mesh (0.25-0.42 mm).

[0004] While atomization can directly produce fine spherical particles, the low density and lack of binding properties of X-MCM-41 molecular sieve powder mean that direct atomization cannot yield green bodies with sufficient "green strength." Introducing traditional inorganic binders such as silica sol and alumina sol would severely clog the valuable mesoporous structure of X-MCM-41, leading to a sharp decrease in specific surface area and adsorption capacity. Using synthetic polymer binders may pose biocompatibility risks and generate harmful gases during calcination.

[0005] Therefore, developing a molding method that can achieve efficient atomization molding of X-MCM-41, maintain its mesoporous structure and adsorption performance, and meet the safety requirements for human contact has become a key technical bottleneck in promoting the application of this excellent adsorbent material in the field of health care. Summary of the Invention

[0006] To address the aforementioned technical bottlenecks, this invention aims to provide a method for molding X-MCM-41 mesoporous molecular sieve microsphere adsorbents. This method uses safe and non-toxic natural raw materials as a composite binder system, prepares 40-60 mesh microspheres through atomization granulation, and precisely controls the process conditions to ensure that the resulting microspheres possess high mechanical strength (high toughness, high hardness, and low pulverization rate) while maximally retaining the high specific surface area and adsorption performance of X-MCM-41, ultimately meeting the requirements for direct application in hygiene and personal care products.

[0007] This invention aims to provide a method for preparing and molding high-strength X-MCM-41 mesoporous molecular sieve microsphere adsorbents suitable for human hygiene products. While X-MCM-41 adsorbent powder possesses excellent adsorption properties, its nanoparticle form presents technical challenges when directly applied to personal care products such as sanitary napkins and diapers. These challenges include easy dust generation, easy penetration of non-woven fabrics into direct skin contact, and easy migration and aggregation in liquid environments leading to localized failure. Therefore, it is necessary to mold it into macroscopic particles with a certain size and mechanical strength.

[0008] Forming X-MCM-41 molecular sieve powder into fine particles of 40-60 mesh presents significant technical challenges. Traditional compression crushing methods produce particles with sharp edges, resulting in poor skin comfort. Extrusion spheroidization is difficult to efficiently produce such fine, uniform spheres. While atomization can directly produce fine spherical particles, X-MCM-41 molecular sieve powder has low density and no inherent binding properties. Conventional binder systems, such as inorganic binders like silica sol and alumina sol, severely clog its valuable mesoporous structure, leading to a sharp decrease in specific surface area and adsorption capacity. Synthetic organic polymer binders pose biocompatibility risks and may produce harmful byproducts during high-temperature calcination, making them unsuitable for hygiene applications involving direct human contact.

[0009] This invention successfully resolves the aforementioned technical contradictions through an innovative bonding system and precise process control.

[0010] The molding principle and mechanism of this invention are mainly based on the following aspects: First, this invention creatively uses attapulgite and guar gum to form a completely natural and non-toxic composite bonding system. Attapulgite, as a natural one-dimensional nanofiber silicate mineral, can form a stable three-dimensional network skeleton in the slurry, giving the slurry good thixotropic properties and suspension stability, preventing the sedimentation of X-MCM-41 particles, and providing initial "skeleton strength" for the green microspheres. Guar gum, as an excellent natural plant gum, can form a high-viscosity pseudoplastic fluid after dissolving in water. On the one hand, it acts as a thickener to ensure that the slurry reaches the viscosity required for atomization; on the other hand, it acts as an excellent film-forming agent, coating the surface of X-MCM-41 and attapulgite particles. Through the "bridging" effect of its polymer chains, it greatly improves the plasticity of the material and the "green strength" and toughness of the green microspheres, ensuring the smooth progress of the atomization process and the integrity of the green body.

[0011] Secondly, this invention features a unique post-processing technique combining programmed heating and drying with precise temperature-controlled calcination. The programmed drying strategy of "high humidity and low temperature first, followed by low humidity and high temperature" effectively controls the migration and evaporation rate of moisture from the inside out, avoiding the significant shrinkage stress caused by rapid surface water loss. This prevents microsphere cracking and deformation, significantly improving the yield and imparting good toughness to the molded body. The subsequent calcination process, by controlling the heating rate (1-5℃ / min) and the final temperature (450-600℃), smoothly and thoroughly decomposes and removes guar gum, while simultaneously forming a strong sintering neck between the attapulgite clay and X-MCM-41 particles. This results in high hardness and low pulverization rate in the microspheres, while maximally protecting the mesoporous structure of X-MCM-41 from high-temperature damage or blockage.

[0012] This invention, through systematic control of the ingredient ratio (X-MCM-41 / attapulgite / guar gum powder), found the optimal balance between mechanical strength and adsorption performance. While excessively high binder content can increase strength, it also excessively occupies pore space, leading to a loss of specific surface area; conversely, excessively low binder content fails to achieve effective molding. The preferred ratio determined by this invention ensures that the molded body possesses high mechanical strength (wear rate ≤ 1.2 wt%) while maintaining its BET specific surface area at 750 m². 2 The high level of / g or above preserves the excellent performance of the original powder adsorbent to the greatest extent.

[0013] This invention does not simply involve the physical granulation of X-MCM-41 adsorbent powder. Instead, it creatively transforms high-performance X-MCM-41 adsorbent powder into a specific form (40-60 mesh microspheres) that can be directly applied to high-value-added hygiene products by selecting safe raw materials (attapulgite clay and guar gum) that match the requirements for human contact and coupling atomization molding with precise heat treatment processes. This represents a crucial technological leap from "laboratory material" to "a form usable in end products."

[0014] The X-MCM-41 mesoporous molecular sieve microsphere adsorbent provided by this invention has good sphericity, a smooth surface, and no sharp edges, preventing leakage from the non-woven fabric of the product and providing a comfortable skin feel. While retaining a high adsorption capacity for target malodorous molecules such as ammonia, trimethylamine, hydrogen sulfide, isovaleric acid, methanethiol, and indole, it possesses excellent engineering application performance not found in traditional powder materials, perfectly meeting the comprehensive requirements of hygiene and care products for adsorbent materials in terms of high efficiency, safety, and practicality.

[0015] The method for forming X-MCM-41 mesoporous molecular sieve microsphere adsorbent includes the following steps: S1: Slurry preparation: By weight, mix 50-85 parts of metal ion exchange modified X-MCM-41 molecular sieve powder, 10-40 parts of attapulgite clay, 3-8 parts of guar gum powder and 80-200 parts of water, and shear at 2500 rpm to prepare a uniform, flowable slurry. S2: Atomization granulation: The slurry obtained in step S1 is atomized into droplets through an atomizing nozzle under the action of compressed air. The droplets are dried by hot air at 100-250℃ in the granulation tower to form 40-60 mesh green microspheres. S3: Drying: Dry the green microspheres in a 70%-95% humidity environment with programmed temperature rise of 30-60℃ for 4-12 hours. S4: Calcination: The dried microspheres are heated to 450-600℃ at a rate of 1-5℃ / min in air or an inert atmosphere and calcined for 2-6 hours to obtain the X-MCM-41 mesoporous molecular sieve microsphere adsorbent.

[0016] Optionally, the X-MCM-41 molecular sieve powder of the present invention is a functionalized powder after metal ion exchange, wherein the metal ions are selected from Li + K + Mg 2+ Ca 2+ Fe 2+ Zn 2+ Ag + At least one of the following. Preparation process of X-MCM-41 molecular sieve powder via metal ion exchange: using appropriate concentrations of Li... + K + Mg 2+ Ca 2+ Fe 2+ Zn 2+ or Ag + The solution was used to perform ion exchange on the raw MCM-41 powder to obtain mesoporous molecular sieve powders with different ion exchanges, which were denoted as X-MCM-41.

[0017] Optionally, in step S1, the weight ratio of the X-MCM-41 molecular sieve powder, attapulgite clay and guar gum powder is (65-75):(20-30):(4-6).

[0018] Optionally, in step S1, the solid content of the slurry is 30%-40%, and the viscosity is 800-2500 mPa·s.

[0019] Optionally, in step S3, the specific steps of the programmed temperature rise drying are as follows: first, maintain a constant temperature and humidity of 30-40℃ and 90%-95% for 2-4 hours, and then slowly raise the temperature to 50-60℃ and 70%-80% for 2-8 hours.

[0020] Optionally, in step S4, the preferred conditions for calcination are: heating to 500-550°C at a rate of 2°C / minute and calcining for 3-5 hours.

[0021] X-MCM-41 molecular sieve powder is produced by processing MCM-41 raw powder through Li... + K + Mg 2+ Ca 2+ Fe 2+ Zn 2+ Ag + After metal ion exchange, the powder is obtained through washing, drying, and calcination. The ion exchange rate of X-MCM-41 molecular sieve powder is 50%-80%.

[0022] Preparation of MCM-41 raw powder: An appropriate amount of hexadecyltrimethylammonium bromide (DTAB) was added to 4.8 L of distilled water to form a homogeneous solution under stirring. 35 mL of sodium hydroxide (2 M) solution was added to this solution, and the mixture was stirred continuously at 80 °C for 5 minutes. Subsequently, an appropriate amount of tetraethyl orthosilicate (TEOS) was added, and the reaction was continued at 80 °C for 10 h with stirring. After the reaction was complete, the product was collected, washed with distilled water, and dried at 60 °C for 24 h. Finally, the obtained MCM-41 material was calcined at 550 °C for 5 h to completely remove the surfactant, yielding dried MCM-41 raw powder.

[0023] The silicon-aluminum ratio in the MCM-41 raw powder is 40-80, calculated as the molar ratio of SiO2 to Al2O3.

[0024] Compared with existing molding technologies, the present invention has the following advantages: This invention successfully solves the molding technology bottleneck of high-performance X-MCM-41 mesoporous molecular sieve microsphere adsorbent in the field of health care. Mesoporous microspheres with uniform particle size (40-60 mesh), good sphericity, and high mechanical strength (good toughness, high hardness, and low pulverization rate) are prepared by atomization molding.

[0025] This invention innovatively uses attapulgite and guar gum as an all-natural composite bonding system. This system is safe, non-toxic, and highly biocompatible, perfectly meeting the stringent safety requirements of human hygiene products for materials.

[0026] This invention, through optimized ingredient ratios and precisely controlled drying and calcination processes, significantly improves the mechanical strength of the material while maximally preserving the high specific surface area and mesoporous structure of X-MCM-41, resulting in minimal loss of saturated adsorption capacity and achieving an excellent balance between strength and adsorption performance.

[0027] The X-MCM-41 mesoporous molecular sieve microsphere adsorbent provided by this invention can be directly used as a functional filler in the absorbent layer of sanitary napkins, diaper pads and other products, achieving efficient and continuous adsorption of various irritating odor molecules, fundamentally improving the comfort and functionality of the products, and providing core material support for the upgrading of such products. Attached Figure Description

[0028] Figure 1 This is a comparison diagram of the physical adsorption isotherms of ammonia gas in multiple embodiments and comparative examples of the present invention.

[0029] Figure 2 The zinc ion (Zn) in Example 1 of this invention 2+ (Image of Zn-MCM-41 molecular sieve powder after exchange)

[0030] Figure 3 This is a physical image of the Zn-MCM-41 mesoporous molecular sieve microsphere adsorbent obtained in Example 1 of the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto. Experimental methods in the following embodiments that do not specify specific conditions are generally carried out under conventional conditions.

[0032] Unless otherwise specified, the X-MCM-41 molecular sieve powder used in the embodiments of this invention is prepared by the following steps: (1) Preparation of MCM-41 raw powder: An appropriate amount of hexadecyltrimethylammonium bromide (DTAB) was added to 4.8 L of distilled water to form a homogeneous solution under stirring. 35 mL of sodium hydroxide (2 M) solution was added to the solution, and the mixture was stirred continuously at 80 °C for 5 minutes. Subsequently, an appropriate amount of tetraethyl orthosilicate (TEOS) was added, and the reaction was continued to be stirred at 80 °C for 10 h. After the reaction was completed, the product was collected, washed with distilled water, and dried at 60 °C for 24 h. Finally, the obtained MCM-41 material was calcined at 550 °C for 5 h to completely remove the surfactant, and dried MCM-41 raw powder was obtained. (2) Preparation of X-MCM-41 molecular sieve powder: Using appropriate concentrations of Li... + K + Mg 2+ Ca 2+ Fe 2+ Zn2+ Ag + The solution was used to perform ion exchange on the MCM-41 raw powder obtained in (1) to obtain mesoporous molecular sieve powders with different ion exchanges, which were denoted as X-MCM-41 (X represents the type of metal); attapulgite, guar gum powder, etc. were all purchased through commercial channels, and their specifications were the conventional specifications in this technical field.

[0033] The performance testing method for the X-MCM-41 mesoporous molecular sieve microsphere adsorbent described in this invention is as follows: Wear rate: Using a vibratory wear tester, a certain mass (m0) of microsphere sample was taken, vibrated and rubbed under specific conditions, and the unpulverized particles were sieved and weighed (m1). Wear rate = (m - m1) / m0 × 100%.

[0034] BET specific surface area: calculated using the nitrogen adsorption-desorption isotherm and the BET (Brunauer-Emmett-Teller) model.

[0035] Single-particle compressive strength: Using a micro-force testing machine, 30 intact microspheres were randomly selected for testing, and the average value was taken.

[0036] Adsorption capacity: The saturated adsorption capacity of a target gas (such as ammonia) is determined at a specific temperature (such as human body temperature 309K) and pressure.

[0037] Example 1 50 g of hexadecyltrimethylammonium bromide (DTAB) was added to 4.8 L of distilled water to form a homogeneous solution under stirring. 35 mL of sodium hydroxide (2 M) solution was added to this solution, and the mixture was stirred continuously at 80 °C for 5 minutes. Then, 250 mL of tetraethyl orthosilicate (TEOS) was added, and the reaction was continued at 80 °C for 10 hours. After the reaction was complete, the product was collected, washed with distilled water, and dried at 60 °C for 24 hours. Finally, the obtained MCM-41 mesoporous molecular sieve was calcined at 550 °C for 5 hours to completely remove the surfactant, yielding dried MCM-41 raw powder. The silica-alumina ratio of the MCM-41 raw powder was determined using XRF, and a silica-alumina ratio of 40-80 was selected.

[0038] Example 2 The obtained MCM-41 raw powder (selected with a silicon-to-aluminum ratio of SiO2 / Al2O3=60) was subjected to zinc ion (Zn) treatment. 2+ After exchange (zinc ion exchange degree of 75%), it is activated by calcination at 350℃ under vacuum for 10 hours to obtain Zn-MCM-41 powder.

[0039] The obtained MCM-41 raw powder was processed by Li + K + Mg 2+ Ca2+ Fe 2+ Zn 2+ Ag + Powders of Li-MCM-41, K-MCM-41, Mg-MCM-41, Ca-MCM-41, Fe-MCM-41, Zn-MCM-41, and Ag-MCM-41 were obtained by metal ion exchange, and all of them are collectively referred to as X-MCM-41 powder.

[0040] Example 3 Weigh out 70g of zinc ion (Zn) 2+ Zn-MCM-41 powder with an ion exchange ratio of 60 (silicon-to-alumina ratio of 60, ion exchange degree of 75%), 25g attapulgite, and 5g guar gum powder were mixed. In a high-speed mixer, the guar gum powder was first added to 120g of 50℃ warm water and stirred at 1000 rpm until completely dissolved into a transparent viscous liquid. Then, the Zn-MCM-41 powder and attapulgite were added, and the stirring speed was increased to 2500 rpm. The mixture was continuously sheared and stirred for 40 minutes to obtain a uniform, flowable slurry with a solid content of approximately 38% and a viscosity of approximately 1500 mPa·s. The prepared slurry is transferred to the feed tank of the pressure spray granulation tower; atomization is performed using an airflow atomizing nozzle with an aperture of 0.5 mm under a compressed air pressure of 0.5 MPa; the hot air inlet temperature of the granulation tower is set to 180℃ and the outlet temperature is about 80℃; 40-60 mesh green microspheres are collected at the cyclone separator at the bottom of the tower. The green microspheres were placed in a constant temperature and humidity chamber and aged and dried for 3 hours at 35°C and 93% humidity. Then the temperature was increased to 55°C at a rate of 10°C / hour, while the humidity was reduced to 75%, and the drying was continued for 5 hours under these conditions. The dried microspheres were transferred to a muffle furnace and heated from room temperature to 520°C at a rate of 2°C / min in air atmosphere, and then calcined at 520°C for 4 hours. After that, the furnace was naturally cooled to room temperature to obtain the Zn-MCM-41 mesoporous molecular sieve microsphere adsorbent of the present invention, which is denoted as sample M1.

[0041] Example 4 Weigh out 80g of calcium ions (Ca) 2+ 15g of attapulgite clay, 5g of guar gum powder, and 130g of deionized water were added to Ca-MCM-41 powder (silicon-to-aluminum ratio of 50, ion exchange degree of 70%), 15g of attapulgite clay, and 5g of guar gum powder. The preparation of the slurry and subsequent atomization, drying, and calcination steps were the same as in Example 3. The resulting Ca-MCM-41 mesoporous molecular sieve microsphere adsorbent was denoted as sample M2.

[0042] Example 5 Weigh out 65g of silver ion (Ag)+ Ag-MCM-41 powder with silica-alumina ratio of 70 and ion exchange degree of 65%, 30g attapulgite, 5g guar gum powder, and 150g deionized water were added. The preparation of the slurry and subsequent atomization, drying, and calcination steps were the same as in Example 3. The resulting Ag-MCM-41 mesoporous molecular sieve microsphere adsorbent was denoted as sample M3.

[0043] Comparative Example 1 (without guar flour) Weigh 70g of Zn-MCM-41 molecular sieve powder, 25g of attapulgite clay, and 0g of guar gum powder, and add 120g of deionized water. After mixing according to the method in Example 3, the slurry could not achieve sufficient viscosity and was in a suspension state, rapidly separating into layers after standing. When attempting atomization, the droplets could not maintain a spherical shape, and after drying, a large number of irregular fragments and powders were obtained, making it impossible to collect complete 40-60 mesh particles. This is designated as sample D1.

[0044] Comparative Example 2 (High-Temperature Rapid Drying) The ingredients were exactly the same as in Example 3. After atomization to obtain green microspheres, instead of using programmed temperature drying, they were directly placed in a 105°C forced-air drying oven for rapid drying for 2 hours. Obvious cracks and poor strength were observed on the surface of the dried microspheres. The subsequent calcination steps were the same as in Example 1. The resulting microspheres were designated as sample D2.

[0045] Comparative Example 3 (excessively high roasting temperature) The ingredients were exactly the same as in Example 3. The atomization and drying steps were the same as in Example 3. During the calcination stage, the final calcination temperature was increased to 650°C, while the other conditions remained unchanged. The resulting microspheres were designated as sample D3.

[0046] Table 1 Performance Comparison Table

[0047] Results Analysis As can be seen from the comparison between Example 3 and Comparative Example 1, guar gum powder, as a thickener and binder, is crucial for forming a stable slurry and obtaining green microspheres with sufficient "green strength". Its absence directly leads to the failure of atomization molding.

[0048] As can be seen from the comparison between Example 3 and Comparative Example 2, the programmed temperature rise drying process used in this invention is crucial for preventing microsphere cracking and achieving low pulverization rate and high toughness. Rapid high-temperature drying leads to internal stress concentration, significantly increases the pulverization rate of the product, and severely reduces its mechanical strength.

[0049] As can be seen from the comparison between Example 3 and Comparative Example 3, the calcination temperature has a decisive influence on the mechanical strength and adsorption performance of the equilibrium microspheres. Although an excessively high calcination temperature (650℃) can further improve the hardness and compressive strength of the microspheres, it will cause the mesoporous structure to partially collapse or sinter, resulting in a significant decrease in specific surface area and adsorption capacity, thus losing its core function as an adsorbent.

[0050] A comprehensive comparison of Examples 3-5 shows that microspheres with excellent overall performance can be successfully prepared within the ingredient range described in this invention. Example 3 (M1) demonstrates superior mechanical strength (wear rate 0.8%, compressive strength 6.5 N) and adsorption performance (specific surface area 820 μm). 2 The optimal balance was achieved between [value] / g and adsorption capacity of 3.5 mmol / g, resulting in the best overall performance. Example 4 (M2) had the highest MCM-41 content, thus exhibiting the largest specific surface area and adsorption capacity, but slightly lower mechanical strength. Example 5 (M3) had the highest mechanical strength due to its high binder skeleton (attapulgite) content, but at the cost of some specific surface area and adsorption capacity. Different ratios can be selected according to specific needs in practical applications.

[0051] The above descriptions are merely several specific embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for forming X-MCM-41 mesoporous molecular sieve microsphere adsorbent, characterized in that, Includes the following steps: S1: Slurry preparation: By weight, mix 50-85 parts of metal ion exchange modified X-MCM-41 molecular sieve powder, 10-40 parts of attapulgite clay, 3-8 parts of guar gum powder and 80-200 parts of water, and shear at 2500 rpm to prepare a uniform, flowable slurry. S2: Atomization granulation: The slurry obtained in step S1 is atomized into droplets through an atomizing nozzle under the action of compressed air. The droplets are dried by hot air at 100-250℃ in the granulation tower to form 40-60 mesh green microspheres. S3: Drying: Dry the green microspheres in a 70%-95% humidity environment with programmed temperature rise of 30-60℃ for 4-12 hours. S4: Calcination: The dried microspheres are heated to 450-600℃ at a rate of 1-5℃ / min in air or an inert atmosphere and calcined for 2-6 hours to obtain the X-MCM-41 mesoporous molecular sieve microsphere adsorbent.

2. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 1, characterized in that, The X-MCM-41 molecular sieve powder that has undergone metal ion exchange has Li ions exchanged. + K + Mg 2+ Ca 2+ Fe 2+ Zn 2 + Ag + At least one of them.

3. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 2, characterized in that, The preparation process of the X-MCM-41 molecular sieve powder after metal ion exchange: using Li... + K + Mg 2+ Ca 2+ Fe 2+ Zn 2+ or Ag + The solution was used to perform ion exchange on the raw MCM-41 powder to obtain mesoporous molecular sieve powders with different ion exchanges, which were denoted as X-MCM-41.

4. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 1, characterized in that, The weight ratio of the metal ion-exchanged X-MCM-41 molecular sieve powder, attapulgite, and guar gum powder is (65-75):(20-30):(4-6).

5. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 1, characterized in that, The solid content of the slurry is controlled at 30%-40%, and the viscosity is 800-2500 mPa·s.

6. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 1, characterized in that, The specific steps of the temperature-heating and drying process are as follows: first, maintain a constant temperature and humidity of 30-40℃ and 90%-95% for 2-4 hours, and then slowly increase the temperature to 50-60℃ and 70%-80% for 2-8 hours.

7. The method for forming the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 1, characterized in that, The calcination conditions are as follows: the temperature is increased to 500-550℃ at a rate of 2℃ / min, and calcined for 3-5 hours.

8. The X-MCM-41 mesoporous molecular sieve microsphere adsorbent obtained by the molding method according to any one of claims 1 to 7, characterized in that, Its particle size ranges from 40 to 60 mesh.

9. The X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 8, characterized in that, Its performance indicators meet the following requirements: wear rate ≤ 1.2 wt%, BET specific surface area ≥ 750 m². 2 / g.

10. The application of the X-MCM-41 mesoporous molecular sieve microsphere adsorbent according to claim 8, characterized in that, In the preparation of sanitary napkins, diapers, or other hygiene care products that come into direct contact with human skin, it is used to adsorb one or more irritating odor gases from ammonia, trimethylamine, hydrogen sulfide, isovaleric acid, methanethiol, indole, nonanal, and decanal.

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