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Lignin-based super-crosslinked polymer with hierarchical pore structure, and preparation method and adsorption application thereof

A lignin-based, polymer technology, used in chemical instruments and methods, other chemical processes, etc., can solve problems such as the need to improve adsorption performance

Active Publication Date: 2020-10-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with commercial adsorbents such as advanced activated carbon, zeolite, and ion exchange resin, the adsorption performance of existing LPOPs adsorbents still needs to be improved.

Method used

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  • Lignin-based super-crosslinked polymer with hierarchical pore structure, and preparation method and adsorption application thereof
  • Lignin-based super-crosslinked polymer with hierarchical pore structure, and preparation method and adsorption application thereof
  • Lignin-based super-crosslinked polymer with hierarchical pore structure, and preparation method and adsorption application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] For the preparation of lignin-based graft copolymer (OLCP), 0.25g ethanol-extracted lignin (organic lignin in Table 1) was dissolved in 25mL ethyl acetate, filtered through a 0.45um filter, and the filtrate was loaded into a three-necked flask, and placed in In the filtrate, according to the mass ratio of lignin: chloromethyl styrene: p-divinylbenzene = 1:14:4, add monomer and crosslinking agent, then add 0.1g azobisisobutylcyanide as initiator, pass into Nitrogen, reacted at 85°C for 6h, solids precipitated out, washed with ethanol and water alternately for 3 times after cooling, and vacuum-dried at 60°C for 1 day to obtain a lignin-based graft copolymer (OLCP), which was named OLCP1. Measured by contact angle ( Figure 5 ) exhibits controllable hydrophobic properties.

[0076] For the preparation of lignin-based hypercrosslinked polymer (OLHCP), 3 g of lignin graft copolymer (OLCP1) was used as a precursor for Friedel-Crafts reaction, that is, swelling in 30 mL of 1,...

Embodiment 2

[0079] For the preparation of lignin-based graft copolymer (OLCP), 0.5g of ethanol-extracted lignin (organic lignin in Table 1) was dissolved in 25mL of ethyl acetate, filtered through a 0.45um membrane filter, and the filtrate was loaded into a three-necked flask In the filtrate, add monomer and crosslinking agent according to the mass ratio lignin: chloromethylstyrene: p-divinylbenzene=1:7:2, then add 0.2g azobisisobutylcyanide as initiator, Nitrogen gas was introduced and reacted at 85°C for 8 hours. Solids precipitated out. After cooling, they were washed alternately with ethanol and water three times, and vacuum-dried at 60°C for 1 day to obtain a lignin-based graft copolymer, which was named OLCP2. Measured by contact angle ( Figure 5 ) exhibits controllable hydrophobic properties.

[0080] For the preparation of lignin-based hypercrosslinked polymer (OLHCP), 3 g lignin graft copolymer (OLCP2) was used as a precursor for Friedel-Crafts reaction, that is, swelling in 30...

Embodiment 3

[0083] Preparation of lignin-based graft copolymer (OLCP), 0.75g of ethanol-extracted lignin (organic lignin in Table 1) was dissolved in 25mL of ethyl acetate, filtered through a 0.45um membrane filter, and the filtrate was loaded into a three-necked flask , in the filtrate by mass ratio lignin: chloromethyl styrene: p-divinylbenzene=1:5:1 add monomer and crosslinking agent, then add 0.4g azobisisobutylcyanide (AIBN) initiator , fed nitrogen, reacted at 85°C for 10h, solids precipitated out, washed with ethanol and water alternately three times after cooling, and dried in vacuum at 60°C for 1 day to obtain a lignin-based graft copolymer, which was named OLCP3. Measured by contact angle ( Figure 5 ) showed controllable hydrophobic properties.

[0084] For the preparation of lignin-based hypercrosslinked polymer (OLHCP), 3 g of lignin graft copolymer (OLCP3) was used as a precursor to carry out Friedel-Crafts reaction, that is, to swell overnight in 30 mL of 1,2-dichloroethan...

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Abstract

The invention discloses a preparation method and adsorption application of a lignin-based super-crosslinked polymer. The lignin taken as raw material undergoes two steps of reactions of lignin graft copolymerization and super-crosslinking polymerization to prepare the lignin-based super-crosslinked polymer. The preparation method comprises the following steps: adjusting the types and dosages of asolvent, a grafted monomer and a cross-linking agent in copolymerization, the copolymerization temperature and the like to obtain a lignin-based precursor polymer with controllable hydrophobicity; and2, changing reaction conditions such as a catalyst and temperature in a Friedel-Crafts reaction to prepare the lignin-based super-crosslinked polymer with a high specific surface area and a hierarchical pore structure. The lignin-based super-crosslinked polymer has a good adsorption effect on environmental pollutants, especially radionuclide iodine, the removal rate is high, and the lignin-basedsuper-crosslinked polymer can still keep good adsorption performance after being recycled for multiple times. The lignin-based polymer is high in specific surface area, simple to prepare, green and environment-friendly, and has a wide application prospect in the field of pollutant adsorption.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass resources and biomass materials, and in particular relates to a preparation method of a lignin-based hypercrosslinked polymer and its adsorption application. Background technique [0002] At present, the common adsorbents mainly include activated carbon, silver-exchanged zeolites, aerogels, metal-organic frameworks (MOFs) and porous organic polymers (POPs). In recent years, POPs, as a new class of popular porous materials, have been increasingly studied by scientists around the world. However, most POPs often use complex monomers, expensive catalysts, or harsh chemical reaction conditions in the preparation process. These factors increase the cost of material development, restrict the industrial production of materials, and limit the scale of materials. Scale application. Therefore, to develop green and low-cost new organic porous materials for environmental pollution adsorption, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F212/14C08F212/36C08J3/24C08J9/00B01J20/26C08L51/00
CPCC08F289/00C08J3/24C08J9/00B01J20/267C08J2351/00C08F212/18C08F212/36Y02C20/40
Inventor 陈介南刘娜邵礼书
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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