Preparation method of mannitol modified zero-valent iron NZVIM and application thereof

A mannitol, zero-valent iron technology, applied in chemical instruments and methods, special treatment targets, water/sludge/sewage treatment, etc., can solve the problems of particle agglomeration and blockage, inhibition of reactivity, easy passivation, and aggregation. , to achieve the effect of improving reaction activity, improving stability, and facilitating precipitation separation and recovery

Active Publication Date: 2019-04-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the past, when zero-valent iron was used in underground environments, its mobility was low, and it was prone to particle agglomeration and blockage. In practical applications, it was easy to passivate, agglomerate, and inhibit reactivity.

Method used

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  • Preparation method of mannitol modified zero-valent iron NZVIM and application thereof
  • Preparation method of mannitol modified zero-valent iron NZVIM and application thereof
  • Preparation method of mannitol modified zero-valent iron NZVIM and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 4.84g FeCl 3 ·6H 2 O powder (17.91 mmol Fe 3+ ) was dissolved in 50mL deionized water, and then the solution was transferred to a three-necked bottle, which was recorded as solution A. Weigh 6.118g of NaBH4 powder (161 mmol BH4-) and dissolve it in 100mL of water, and record it as liquid B. Take liquid B and add it dropwise to solution A at a rate of 15 drops / min, and continue to stir for 20 minutes after the addition is completed. 2 It was carried out under the atmosphere, then vacuum-filtered and washed several times with absolute ethanol to obtain a black solid which was vacuum-dried at 60° C. overnight, and then sealed and stored with nitrogen gas. You can get unmodified nano zero-valent iron NZVI 0 .

Embodiment 2

[0028] Weigh 4.84g FeCl 3 ·6H 2 O powder (17.91 mmol Fe 3+ ) was dissolved in 50 mL of 0.6 mol / L mannitol aqueous solution, which was designated as solution A. Weigh 6.118g NaBH 4 powder (161 mmol BH4 - ) was dissolved in 100mL of water and recorded as liquid B. in N 2Under the atmosphere, take liquid B and add it dropwise to solution A at a rate of 15 drops / min. After the dropwise addition, continue to stir and react for 30 minutes, then vacuum filter and wash with absolute ethanol several times to obtain a black solid and dry it in vacuum at 70°C. , overnight, and sealed after being filled with nitrogen. Mannitol-modified nano zero-valent iron NZVI can be obtained M0.6 .

Embodiment 3

[0030] Weigh 4.84g FeCl 3 ·6H 2 O powder (17.91 mmol Fe 3+ ) was dissolved in 50 mL of 1.0 mol / L mannitol aqueous solution, recorded as solution A. Weigh 6.118g NaBH 4 powder (161 mmol BH4 - ) was dissolved in 100mL of water and recorded as liquid B. in N 2 Under the atmosphere, take liquid B and add it dropwise to solution A at a rate of 15 drops / min. After the dropwise addition, continue to stir and react for 30 minutes, then vacuum filter and wash with absolute ethanol several times to obtain a black solid and dry it in vacuum at 70°C. , overnight, and sealed after being filled with nitrogen. Mannitol-modified nano zero-valent iron NZVI can be obtained M0.6 .

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Abstract

The invention discloses a preparation method of mannitol modified zero-valent iron NZVIM. The preparation method comprises the following steps: FeCl3.6H2O powder is dissolved in mannitol water solution and marked as solution A; NaBH4 powder is weighed to dissolve in water and marked as solution B; and under the nitrogen condition, the solution B is dripped in the solution A, is continuously stirred for reaction by 15-25 min after dripping, is filtered in vacuum, is washed by anhydrous ethanol, is dried in vacuum, and is sealed for preservation after nitrogen filling to obtain the mannitol modified zero-valent iron NZVIMx, wherein M is mannitol, and x is the mole concentration of the mannitol, and is higher than 0.1 and lower than 1.5. The mannitol modified zero-valent iron NZVIM can be decomposed to sulfur-contained or nitrogen-contained azo dye pollutants , heavy metal solution and natural toxin microcystic toxins under the dark condition.

Description

technical field [0001] The technical field related to the present invention is the technical field of inorganic nanometer materials, in particular relates to zero-valent iron with reductive and highly active network chain structure and its preparation method. Background technique [0002] Nano zero valent iron (NZVI) has attracted widespread attention due to its good reducing properties and effective removal of some pollutants in groundwater or soil. However, due to the weak van der Waals force on the surface, high surface potential energy and magnetism of NZVI, the mobility of unmodified nZVI colloids is low when applied in underground environments, and the poor stability of the colloids makes the particles agglomerate and gels, which is prone to particle formation. Agglomeration and blockage, easy passivation and aggregation in practical applications, inhibit the reactivity of NZVI, thereby reducing its degradation efficiency for pollutants in water. In order to reduce th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00C02F1/58C02F1/62C02F1/50C02F101/20C02F101/38C02F101/30
CPCB82Y40/00C02F1/50C02F1/58C02F1/62B22F9/24C02F2303/04C02F2101/38C02F2101/20C02F2101/308
Inventor 方艳芬黄应平付桂荣牛慧斌
Owner CHINA THREE GORGES UNIV
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