CN-121972127-A - Heavy metal ion adsorption material for tobacco extract and preparation method thereof

Abstract

The invention belongs to the technical field of tobacco technology and heavy metal ion removal, and provides a heavy metal ion adsorption material for tobacco extract and a preparation method thereof, wherein the heavy metal ion adsorption material comprises three independent functional adsorption pieces which are arranged in series in sequence and physically adopt modified non-woven fabrics as substrates, the modified non-woven fabrics adopt polylactic acid and natural fibers as raw materials, and the modified non-woven fabrics are obtained through surface roughening and hydroxyl activation, and the functional adsorption pieces are respectively a first adsorption piece, namely, the modified non-woven fabrics loaded with Fe 3 O 4 and are used for carrying out primary adsorption treatment on the tobacco extract; the second adsorption piece is a modified non-woven fabric loaded with sulfhydryl MOF and used for carrying out secondary adsorption treatment on the tobacco extract after primary treatment, and the third adsorption piece is a modified non-woven fabric loaded with chitosan and used for carrying out tertiary adsorption treatment on the tobacco extract after secondary adsorption treatment. The method can efficiently remove various heavy metal ions such as chromium, arsenic, lead, mercury, cadmium and the like in the tobacco extract, and improve the safety and quality of reconstituted tobacco.

Inventors

• CHU WENJUAN
• ZHANG DONGYU
• MA XIAOHUA
• SONG WEIMIN
• CHENG DONGXU
• CUI JIANHUA
• WANG GAOJIE
• DUAN KE
• AI DAN
• LI HUAYU

Assignees

• 河南中烟工业有限责任公司

Dates

Publication Date

20260505

Application Date

20260318

Claims (10)

1. 1. The heavy metal ion adsorption material for the tobacco extracting solution is characterized by comprising three independent functional adsorption parts which are sequentially and physically connected in series along the fluid flow direction, wherein the three independent functional adsorption parts are respectively obtained by using modified non-woven fabrics as a substrate, polylactic acid and natural fibers as raw materials and performing surface roughening and hydroxyl activation on the modified non-woven fabrics, and the three independent functional adsorption parts are respectively: the first adsorption piece is the modified non-woven fabric loaded with Fe 3 O 4 and is used for carrying out primary adsorption treatment on the tobacco extract; The second adsorption piece is the modified non-woven fabric loaded with the sulfhydryl MOF and is used for carrying out secondary adsorption treatment on the tobacco extract after primary treatment; the third adsorption piece is the modified non-woven fabric loaded with chitosan and is used for carrying out three adsorption treatments on the tobacco extract after the secondary adsorption treatment.
2. 2. The heavy metal ion adsorbing material according to claim 1, wherein the loading amount of Fe 3 O 4 on the first adsorbing means is 10mg/cm 2 ~20mg/cm 2 .
3. 3. The heavy metal ion adsorbing material according to claim 1, wherein the loading of the thiol-group-containing MOF on the second adsorbing member is 10mg/cm 2 ~50mg/cm 2 .
4. 4. The heavy metal ion adsorbing material according to claim 1, wherein the chitosan loading on the third adsorbing member is 10mg/cm 2 ~20mg/cm 2 .
5. 5. The preparation method of the heavy metal ion adsorption material for the tobacco extract is characterized by comprising the following steps of: (1) Preparing non-woven fabrics by taking polylactic acid and natural fibers as raw materials, soaking the non-woven fabrics in alkali liquor, and carrying out surface roughening and hydroxyl activation to obtain modified non-woven fabrics; (2) Immersing the modified non-woven fabric obtained in the step (1) into an iron salt solution, carrying out pH adjustment and ultrasonic reaction treatment, and carrying out load on the surface of the modified non-woven fabric to obtain Fe 3 O 4 , so as to obtain a first adsorption piece; (3) Sequentially immersing the modified non-woven fabric obtained in the step (1) into Zn (NO 3 ) 2 methanol solution and 2-mercaptoimidazole methanol solution, carrying out ultrasonic reaction, and then loading the surface of the modified non-woven fabric to obtain a sulfhydryl-containing MOF (metal oxide semiconductor) to prepare a second adsorption piece; (4) Immersing the modified non-woven fabric obtained in the step (1) into chitosan solution, carrying out primary ultrasonic treatment, pH adjustment and secondary ultrasonic treatment, and loading chitosan on the surface of the modified non-woven fabric to obtain a third adsorption piece; (5) And the first adsorption piece, the second adsorption piece and the third adsorption piece are sequentially and physically connected in series along the fluid flow direction, and the heavy metal ion adsorption material is obtained through assembly.
6. 6. The method according to claim 5, wherein the reaction conditions of step (1) satisfy at least one of the following conditions (a) to (c): (a) The alkali liquor is sodium hydroxide solution; (b) The concentration of the alkali liquor is 0.1 mol/L-1.0 mol/L; (c) The mass ratio of the non-woven fabric to the alkali liquor is 1 (20-50).
7. 7. The method according to claim 5, wherein in the step (1), the pore diameter of the nonwoven fabric is 10 μm to 50 μm.
8. 8. The method according to claim 5, wherein the reaction conditions of step (2) satisfy at least one of the following conditions (d) to (f): (d) The total concentration of iron ions in the ferric salt solution is 0.1mol/L to 0.5mol/L, wherein the molar concentration of Fe 2+ ：Fe 3+ is 1:2; (e) The mass ratio of the modified non-woven fabric to the ferric salt solution is 1 (20-50); (f) The pH was adjusted to pH 10.
9. 9. The production method according to claim 5, wherein the reaction condition of step (3) satisfies at least one of the following conditions (g) to (i): (g) The concentration of zinc ions in the methanol solution of the Zn (NO 3 ) 2 is 0.1mol/L to 0.5mol/L; (h) The concentration of the 2-mercaptoimidazole in the methanol solution of the 2-mercaptoimidazole is 0.4 mol/L-2.0 mol/L; (i) The mass ratio of the modified non-woven fabric to the Zn (methanol solution of NO 3 ) 2 ) is 1 (20-50).
10. 10. The method according to claim 5, wherein the reaction conditions of step (4) satisfy at least one of the following conditions (j) to (l): (j) The concentration of the chitosan solution is 1% -3%; (k) The time of the primary ultrasonic wave is 10 min-30 min and the frequency is 40kHz, and the time of the secondary ultrasonic wave is 10 min-30 min and the frequency is 10kHz; (l) The mass ratio of the modified non-woven fabric to the chitosan solution is1 (20-50).

Description

Heavy metal ion adsorption material for tobacco extract and preparation method thereof Technical Field The application relates to the technical field of tobacco technology and heavy metal ion removal, in particular to a heavy metal ion adsorption material for tobacco extract and a preparation method thereof. Background The reconstituted tobacco is used as an important component of the cigarette formula, and has the effects of saving production cost, reducing tar release amount, adjusting combustion performance, improving smoking quality and the like. With the development of industry technology and the increasing health demands of consumers, the demands for high-quality and personalized cigarette products are increasing, and accordingly, the quality demands for reconstituted tobacco are also increasing. The tobacco extract is used as an important intermediate process material for the production of reconstituted tobacco, and is prepared by mainly extracting water-soluble substances such as nicotine, saccharides and the like in tobacco stems, tobacco dust, crushed tobacco leaves and low-grade tobacco leaves through a continuous extraction process, filtering and removing insoluble substances, and finally performing reverse osmosis membrane separation treatment. Because tobacco belongs to plants which are easy to absorb and accumulate heavy metals, the tobacco plants can absorb heavy metal elements in soil through root systems in the growing process, the heavy metals can be gradually accumulated along with the growth and maturity of tobacco leaves, and the pH value of tobacco extract is generally 4-5, so that certain amount of heavy metal ions such as arsenic, lead, cadmium, mercury, chromium and the like are inevitably contained in the preparation of the tobacco extract. The presence of these heavy metal elements not only affects the quality of the reconstituted tobacco finished product, but more importantly, they can pose a potential threat to human health. Therefore, reducing the heavy metal content in the tobacco extract and improving the safety thereof becomes a problem to be solved urgently in the tobacco industry. Currently, conventional technologies for removing heavy metal ions mainly focus on removing heavy metal ions contained in industrial wastewater, and mainly include chemical precipitation methods, redox methods, electrolytic methods, solvent extraction separation methods, ion exchange methods, adsorption methods, membrane separation methods, and emerging biological treatment technologies. The chemical precipitation method, the oxidation-reduction method, the electrolysis method and the solvent extraction separation method require adding other chemical substances into the solution to be purified, are not suitable for being used as a purification technology of heavy metal ions in tobacco extract, have the advantages of limited treatment efficiency, high cost, complex biological treatment technology operation and high treatment difficulty of an ion exchange method, an adsorption method and a membrane separation method, and therefore, the methods have certain limitations on industrial application of removing the heavy metal ions in the tobacco extract. For example, the patent application document with publication number of CN119346081A discloses a bimetal MOFs/chitosan composite gel, a preparation method and application thereof, which belong to the technical field of water body repair materials, MOFs adsorbents are modified through metal doping (iron doping), the structure of the MOFs adsorbents is optimized, active adsorption sites are increased, and doped iron ions are combined through electrostatic attraction and coordination bonds, so that the adsorption efficiency and selectivity are improved, and the materials still show excellent performance in complex water body environments, so that the adsorption capacity for heavy metal pollutants in mine wastewater is remarkably improved. Iron is used as a transition metal which has rich resources, low cost and no toxicity, and is safer and more reliable than other metals. Meanwhile, the iron ions can form cationic bridge bonds with the electron-rich antibiotic groups, and the antibiotic molecules also have good adsorption capacity. The bimetallic MOFs/chitosan composite gel can efficiently treat heavy metal ions in mine wastewater, can simultaneously remove heavy metals and antibiotics, and is particularly suitable for simultaneously removing Cu (II) and ciprofloxacin. The method discloses a chitosan matrix, a bimetal MOFs and a result of the combined action of the two composite structures, so that an efficient and multifunctional adsorption material is formed, the action mechanism of the adsorption material mainly comprises coordination chelation, ion exchange, physical adsorption and synergistic enhancement effects, and MOFs are grown in a crosslinked chitosan three-dimensional network to form a uniform composite material. However, the action mechanism