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A kind of wheat straw bio-based ion-exchange adsorption material and preparation method thereof

An ion exchange and adsorption material technology, applied in the field of natural biomass-based materials and their surface functionalization modification, can solve the problems of difficult large-scale production, self-polymerization reaction conditions, low utilization rate of monomers, etc., and achieve easy degradation. , rich sources, significant social and economic benefits

Inactive Publication Date: 2017-10-27
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultraviolet light irradiation technology has high grafting efficiency and is currently the most used method, but there are dark areas in the light, and it is difficult to initiate the backlight surface and inner surface of the material, resulting in uneven grafting
Although the above grafting methods can achieve the purpose of grafting, they all have the common problems of high grafting cost and difficulty in large-scale production.
Chemical grafting is usually initiated by heat, the equipment is simple, and it can be scaled up. However, the traditional method is to disperse the initiator in the solution. Problems such as low volume utilization

Method used

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  • A kind of wheat straw bio-based ion-exchange adsorption material and preparation method thereof
  • A kind of wheat straw bio-based ion-exchange adsorption material and preparation method thereof
  • A kind of wheat straw bio-based ion-exchange adsorption material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A wheat straw bio-based ion-exchange adsorption material, the preparation method of which comprises the following steps:

[0035] 1) Washing the wheat straw, drying it, placing it in a plant pulverizer, pulverizing it, and sieving through 80 meshes to obtain the wheat straw fine fiber.

[0036] 2) Immerse the wheat straw fine fibers in 15wt% NaOH solution for 24 hours, carry out decrystallization treatment, then filter and wash with water until neutral, obtain decrystallized wheat straw, dry for later use.

[0037] 3) Weigh 1g of decrystallized wheat straw into a round-bottomed flask filled with 50mL of N,N-dimethylformamide, add 4mL of bromoisobutyryl bromide and 1mL of pyridine dropwise, and stir at 60°C under magnetic stirring. React for 24 hours. After the reaction is completed, wash with tetrahydrofuran and acetone, then wash with excess deionized water and filter, and dry at room temperature to constant weight to obtain brominated wheat straw with initiator groups...

Embodiment 2

[0043] A wheat straw bio-based ion-exchange adsorption material, the preparation method of which comprises the following steps:

[0044] 1) Washing the wheat straw, drying it, placing it in a plant pulverizer, pulverizing it, and sieving through 80 meshes to obtain the wheat straw fine fiber.

[0045] 2) The fine fibers of wheat straw were immersed in 25wt% NaOH solution for 6 hours for decrystallization treatment, and then filtered and washed until neutral to obtain decrystallized wheat straw, which was dried for later use.

[0046] 3) Weigh 1.0 g of decrystallized wheat straw and add it to a round-bottomed flask containing 30 mL of N,N-dimethylformamide, add 3 mL of bromoisobutyryl bromide and 1 mL of pyridine dropwise, and stir at 25 The reaction was carried out at ℃ for 24 hours. After the reaction was completed, it was rinsed with tetrahydrofuran and acetone, then washed with excess deionized water and filtered, and dried at room temperature to constant weight to obtain b...

Embodiment 3

[0050] A wheat straw bio-based ion-exchange adsorption material, the preparation method of which comprises the following steps:

[0051] 1) Washing the wheat straw, drying it, placing it in a plant pulverizer, pulverizing it, and sieving through 80 meshes to obtain the wheat straw fine fiber.

[0052] 2) The fine fibers of wheat straw were immersed in 10wt% NaOH solution for 24 hours for decrystallization treatment, and then filtered and washed until neutral to obtain decrystallized wheat straw, which was dried for later use.

[0053] 3) Weigh 1g of decrystallized wheat straw into a round-bottomed flask filled with 60mL of N,N-dimethylformamide, add 6mL of bromoisobutyryl bromide and 2mL of pyridine dropwise, and stir at 40°C under magnetic stirring React for 12 hours. After the reaction is completed, wash with tetrahydrofuran and acetone, then wash with excess deionized water and filter, and dry to constant weight at room temperature to obtain brominated wheat straw with init...

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Abstract

The invention discloses a wheat straw bio-based ion exchange type adsorbing material and a preparation method thereof. The preparation method comprises the following steps: selecting wheat straws as the raw material, grafting monomer molecules with initiating groups to the surfaces of the wheat straws, and thermally initializing transfer of surface atom free groups so as to realize the chain growth of a polymer monomer, and thus obtaining the wheat straw bio-based ion exchange type adsorbing material with high grafting ratio and high adsorbing capacity. The wheat straw bio-based ion exchange type adsorbing material can be applied for enriching and recovering rear-earth ions of rare earth mineral and metallurgical wastewater, and can be regenerated and reused for many times. A reasonable resource utilization way of the wheat straws is developed, linear chain polymers are grafted on the surfaces of substrates by utilizing a thermal initiation technique in a chemical bonding manner, and the adsorbing material has the characteristics of stable performances, high grafting amount, large adsorption capacity, high adsorption speed, easiness in regeneration and the like, the ideas of recycling waste materials and treating a waste with another waste are achieved, and the social benefits and the economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of natural biomass-based materials and surface functional modification thereof, in particular to a wheat straw bio-based ion-exchange adsorption material and a preparation method thereof. Background technique [0002] my country is a large agricultural country. Wheat is distributed in most areas of our country. The annual output of straw is nearly 700 million tons. Such an astonishing amount of crop straw, especially how to deal with wheat straw has become a problem worthy of attention. In recent years, with the transfer of rural labor force, the improvement of energy consumption structure and the application of various alternative raw materials, coupled with the reasons of high cost, poor economy and low degree of industrialization of straw comprehensive utilization, regional, seasonal and structural problems have begun to appear. After the wheat harvest every year, because there is no place to stack straw,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30
CPCB01J20/24B01J20/3085B01J20/3204B01J2220/445B01J2220/4825B01J2220/50
Inventor 周奇严春杰罗文君刘晨杨恒
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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