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Preparation method and preprocessing method of biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system

A kind of ferric oxide, biological material technology

Inactive Publication Date: 2014-06-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the iron-embedded pellets prepared by the above method show a good stabilization effect on nanomaterials, they generally have the disadvantages of low strength, fragile structure, and low recycling rate. At the same time, the internal Fe 0 It is oxidized to a certain extent during the preparation process, which affects its use effect and makes the overall removal efficiency of the embedded beads low for pollutants.

Method used

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  • Preparation method and preprocessing method of biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system
  • Preparation method and preprocessing method of biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system
  • Preparation method and preprocessing method of biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using the method of the present invention to prepare polyvinyl alcohol-sodium alginate embedded zero-valent iron-ferric oxide embedded pellets, and apply it to the restoration of Cr(VI) polluted water, the steps are as follows:

[0036] (1) Weigh 0.745g FeCl 3 ·6H 2 O and 0.3825g FeSO 4 ·7H 2 O, put in a 250mL three-neck flask, add 100mL deionized water, and stir in a constant temperature water bath at 60°C. Under the protection of nitrogen at a flow rate of 150mL / min, 8mol / L ammonia water was added dropwise to make the reaction system alkaline to a pH above 11, and aged at a constant temperature for 2 hours to obtain nano-ferric oxide particles, which were separated and washed and then transferred to In a 1L three-neck flask, add 0.375g FeSO 4 ·7H 2 400mL deionized aqueous solution of O, stirring at constant temperature, dropwise add 0.35g NaBH 4 100mL of deionized aqueous solution, reacted for 1 hour, magnetically separated, washed with deionized water until neu...

Embodiment 2

[0051] When studying the preparation of polyvinyl alcohol-sodium alginate-embedded zero-valent iron-ferric oxide double nanosystem pellets by using the present invention, the influence of different preparation and pretreatment methods on the removal ability of the prepared pellets, specific steps as follows:

[0052] Examples 2-10 used different ratios of polyvinyl alcohol (PVA) and sodium alginate (SA) to prepare bi-nano material beads embedded with zero-valent iron-ferric oxide, and used to treat Cr(VI). Other operation steps are with embodiment 1, and raw material ratio and corresponding removal efficiency are as shown in table 3:

[0053] Table 3 The removal effect of different ratios of polyvinyl alcohol and sodium alginate to embed beads

[0054] Example

2

3

4

5

6

7

8

9

10

SA:PVA(wt%)

0.5:2

1.5:2

2.5:2

0.5:5

1.5:5

2.5:5

0.5:8

1.5:8

2.5:8

12 hours removal rate

60.2%

90....

Embodiment 18

[0060] To study the influence of the pretreatment step on the performance of the pellets and the percolation of iron during the use of the pellets when preparing polyvinyl alcohol-sodium alginate-embedded zero-valent iron-ferric oxide double nanosystem pellets by using the present invention And the reuse situation, the specific steps are as follows:

[0061] 1) Place the pellets prepared in the steps of Example 1 without pretreatment, only acidified pellets, and acidified + reduced pellets in a constant temperature water bath at 30°C and 150 rpm for oscillation Cultivate in the box, and study the breakage rate during the process to characterize its mechanical strength. At the same time, another group of small balls was air-dried under natural conditions, and the changes of the small balls were studied during the process;

[0062] 2) Add 8.0 g of pretreated polyvinyl alcohol-sodium alginate embedded zero-valent iron-ferric oxide pellets to 100 mL of Cr(VI) aqueous solution con...

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Abstract

The invention belongs to the technical field of biomaterial embedment and particularly relates to a preparation method and a preprocessing method of a polyvinyl alcohol-sodium alginate biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system. Ferrous pellets which are prepared by the method are applicable to the field of conventional zero-valent-iron pollution remediation, and meanwhile, potential risks in the application of nanometer materials are decreased, so that the purpose of safe and highly-efficient processing is achieved. The preparation method and the preprocessing method of the biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system comprise the following steps of preparing a zero-valent-iron-ferroferric-oxide double-nanometer material by using ferroferric-oxide granules which are prepared by a coprecipitation method as a stabilizing agent of nanometer zero-valent-iron granules; then carrying out embedded processing on the double-nanometer material by selecting a proper biomaterial to obtain embedded pellets; finally carrying out acid processing and reduction processing on the embedded pellets to obtain stable and highly-efficient biomaterial-embedded zero-valent-iron-ferroferric-oxide pellets.

Description

technical field [0001] The invention belongs to the technical field of biomaterial embedding, and the method particularly relates to a preparation and pretreatment method of polyvinyl alcohol-sodium alginate biomaterial embedding zero-valent iron-ferric oxide double nanometer system. The iron-containing pellets prepared by the invention can be applied to the field of conventional zero-valent iron pollution restoration, and at the same time reduce potential risks in the application of nanometer materials to achieve the purpose of safe and efficient treatment. Background technique [0002] Nanoscale zero-valent iron (Fe 0 ) The electrode has low potential and large specific surface area, and can quickly reduce ions, compounds and some organic substances with strong oxidizing properties. It is an ideal in-situ repair medium for the environment. However, the particles are small, the surface is active, and it is easy to react with the surrounding medium (water, air, etc.), formi...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24C02F1/70B82Y30/00B82Y40/00
Inventor 吕晓书胡运俊薛晓芹朱瑾徐新华
Owner ZHEJIANG UNIV
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