A method for preparing cationic adsorption materials by grafting functional polymers on the surface of sawdust induced by ultraviolet light

A functional polymer, cation adsorption technology, applied in the direction of chemical instruments and methods, other chemical processes, etc., can solve the problems of high grafting conditions and equipment requirements, self-polymerization reaction conditions, substrate body damage, etc. The effect of large-scale production, abundant sources, and easy degradation

Inactive Publication Date: 2019-01-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical grafting is usually initiated by heat, the equipment is simple, and is suitable for mass production in factories, but the initiator needs to be dispersed in the solution. Once the reaction is carried out, self-polymerization is easy to occur and the reaction conditions are not easy to control, resulting in low grafting rate and monomer utilization. low problem
The reaction of high-energy radiation and plasma grafting is relatively rapid, and the grafting range can be controlled, but the conditions and equipment for grafting are relatively high, and it is harmful to the substrate body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing composite ion-exchange adsorption materials by ultraviolet light-induced grafting on the surface of sawdust, comprising the steps of:

[0030] (1) drying the sawdust after washing, and sieving through 20 mesh to obtain uniform sawdust particles;

[0031] (2) Submerge the sawdust particles in a round-bottomed flask equipped with 9wt% NaOH alcohol solution (ethanol: water = 1:1), react in a water bath at 95°C for 1h, then filter and wash with water until neutral, and dry to obtain decrystallized sawdust (SD);

[0032] (3) Weigh 1.0g step (2) gained decrystallization sawdust (SD) and immerse in the ethanol solution of photosensitizer benzophenone (BP) of 15mL 1vt%, leave standstill 6h under the dark condition and filter off the solution , air-dried to constant weight at room temperature and protected from light to obtain decrystallized sawdust loaded with BP on the surface;

[0033] (4) Dissolve 5.25mL of acrylic acid (AA) in 9.75mL of water to obt...

Embodiment 2

[0036] A method for preparing composite ion-exchange adsorption materials by ultraviolet light-induced grafting on the surface of sawdust, comprising the steps of:

[0037] (1) drying the sawdust after washing, and sieving through 20 mesh to obtain uniform sawdust particles;

[0038] (2) Submerge the sawdust particles in a round-bottomed flask equipped with 9wt% NaOH alcohol solution (ethanol: water = 1:1), react in a water bath at 95°C for 1h, then filter and wash with water until neutral, and dry to obtain decrystallized sawdust (SD);

[0039] (3) Weigh 1.0g step (2) gained decrystallization sawdust (SD) and immerse in the ethanol solution of photosensitizer benzophenone (BP) of 15mL 1vt%, leave standstill 6h under the dark condition and filter off the solution , air-dried to constant weight at room temperature and protected from light to obtain crystal-eliminating sawdust loaded with photosensitizer BP on the surface;

[0040] (4) Dissolve 5.25mL of acrylic acid (AA) in 9...

Embodiment 3

[0043] A method for preparing composite ion-exchange adsorption materials by ultraviolet light-induced grafting on the surface of sawdust, comprising the steps of:

[0044] (1) drying the sawdust after washing, and sieving through 20 mesh to obtain uniform sawdust particles;

[0045] (2) Submerge the sawdust particles in a round-bottomed flask equipped with 9wt% NaOH alcohol solution (ethanol: water = 1:1), react in a water bath at 80°C for 2h, then filter and wash with water until neutral, dry to obtain decrystallized sawdust ;

[0046] (3) Take by weighing 1.0g step (2) gained decrystallization sawdust (SD) and immerse in the ethanol solution of the photosensitizer benzophenone (BP) that 15mL 0.5vt% is housed, react 3h behind the dark condition and filter Remove the solution, air-dry to constant weight at room temperature and avoid light, and obtain decrystallization sawdust with photosensitizer BP loaded on the surface;

[0047] (4) Dissolve 10.5mL of acrylic acid (AA) in...

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Abstract

The invention belongs to the technical field of utilization of natural biomass materials and function modification of surfaces of the natural biomass materials, and particularly relates to a method for preparing a cation adsorption material from an ultraviolet-initiated sawdust surface grafting functional polymer. Hydrogen bonds between main component celluloses in sawdust are broken through an alkali steeping reaction, so surface molecular crystallinity is reduced, modifier molecular accessibility is increased, and more surface hydroxyl groups are exposed; a photosensitizer is loaded to crystal elimination sawdust surfaces in advance in an infiltration mode, the photosensitizer is initiated by ultraviolet rays to capture hydrogen atoms on cellulose surfaces, then surface free radicals of sawdust base materials are produced, acrylic monomers are initiated to be added to the surface free radicals, and therefore the chain increase of functional polymer polyacrylic acid chains is achieved, and finally PAA is grafted on the crystal elimination sawdust surfaces. The prepared SD-g-PAANa compound adsorption material has the advantages of being uniform in loading, high in grafting rate and large in adsorption amount, few homopolymers exist in a reaction system, and the monomer utilization rate is high.

Description

technical field [0001] The invention belongs to the technical field of utilization of natural biomass materials and their surface functional modification, and in particular relates to a method for preparing cationic adsorption materials by grafting functional polymers on the surface of sawdust triggered by ultraviolet light. Background technique [0002] With the rapid development of China's economy and rapid population growth, the demand for energy is increasing, and non-renewable resources mainly fueled by fossils such as coal, oil, and natural gas have become the material basis for the survival of human society . The large amount of energy consumption and the decrease of traditional energy sources have become increasingly unable to meet the sustainable needs of national economic development. At the same time, the consumption of energy has also caused a series of environmental problems - air pollution, water pollution, soil pollution; greenhouse effect, acid rain, ozone l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08F2/50B01J20/26B01J20/30
CPCB01J20/264B01J2220/4825B01J2220/4887C08F2/50C08F289/00C08F220/06
Inventor 罗文君高珊周奇罗天添孙娜
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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