Corncob modified material and preparation method and application thereof

A technology of modified materials and corncobs, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., to achieve strong selectivity and good adsorption effect

Inactive Publication Date: 2015-09-02
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of existing corn cob modified materials, and provide...

Method used

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  • Corncob modified material and preparation method and application thereof
  • Corncob modified material and preparation method and application thereof
  • Corncob modified material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of corn cob modified material

[0032] S1: After removing the surface dirt from the corncobs, vacuum-dry them at 60°C for 24 hours until constant weight, take them out, pulverize them, and sieve them to obtain dry corncob powder with a particle size of 90 mesh.

[0033] S2: Weigh 10g of corn cob powder into a beaker, add 100mL (0.5mol / L) NaOH solution, soak at room temperature for 24h, then vacuum filter and wash with deionized water repeatedly until the filtrate is neutral, then drain Obtain filter residue. Then add the obtained filter residue into 100mL (0.5mol / L) HNO3 solution, soak again at room temperature for 24h, vacuum filter and wash with deionized water repeatedly until the filtrate is neutral, then pump dry again and dry to constant weight Obtain pretreated corncob flour.

[0034] S3: Take 1 g of pretreated corncob powder into a three-neck flask, add 50 mL of deionized water and soak until all the corncob powder settles to the bottom of the ...

Embodiment 2～5

[0045] The main steps of Examples 2-5 are the same as those of Example 1, the difference lies in the process conditions of steps S1-S4, the specific parameters are shown in Table 1, and the experimental results are included in Table 3.

[0046] Table 1

[0047]

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Abstract

The invention relates to the technical field of modified materials and discloses a corncob modified material and its preparation method and application. The preparation method of the modified material comprises the following steps: S1, drying and crushing to obtain a corncob powder of 90-160 meshes; S2, immersing the corncob powder with a sodium hydroxide solution and a salpeter solution to obtain a pretreated corncob powder; S3, immersing the pretreated corncob powder in water, adding an initiator, adding a monomer, reacting at the reaction temperature of 25-40 DEG C for 1-2.5h, and separating to obtain a crude product; and S4, purifying the crude product to obtain the corncob modified material. According to the corncob modified material, physical adsorption and chemical adsorption synergism of corncob are fully performed. The corncob modified material has a good adsorption effect and has strong heavy metal ion selectivity.

Description

technical field [0001] The invention relates to the technical field of modified materials, and more specifically relates to a modified corncob material and its preparation method and application. Background technique [0002] Corn cob is mainly composed of cellulose and lignin. It is determined that corn cob contains 77% water, 52.9% soluble nitrogen-free matter, 33.1% crude fiber, 2%-6% crude protein, 0.5% crude fat and 3.2% ash. The chemical structure of corncob contains active chemical groups such as carboxyl, amino, and benzene rings, which can undergo ion exchange adsorption or chemical adsorption with heavy metal ions. In addition, the corn cob has a porous structure, and the adsorption effect is achieved through the principle of physical adsorption, and the regeneration and recovery of the adsorbent is facilitated by the physically adsorbed substance. [0003] However, it is not enough to rely on the adsorption capacity of corncob itself to adsorb heavy metal ion was...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 龚圣周新华
Owner ZHONGKAI UNIV OF AGRI & ENG
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