Sulfide nanometer zero-valent iron particle as well as preparation method and application thereof

A nano-zero-valent iron and particle technology, applied in iron sulfide, chemical instruments and methods, inorganic chemistry, etc., can solve the limitations of large-scale production and application of sulfide-type nano-zero-valent iron particles, reduce the selectivity and reduction of target pollutants Conversion efficiency, consumption of large reduction capacity and other problems, to achieve the effect of high reduction conversion efficiency, low production cost and high selectivity

Active Publication Date: 2019-08-23
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still the following defects and deficiencies in the practical application of nano-zero-valent iron particles: 1) Under the influence of van der Waals force, magnetic force and other surface forces, nano-zero-valent iron particles are easy to aggregate into particles with larger particle sizes, and the reaction The activity is greatly reduced; 2) In the actual pollution remediation process, the reactivity of nano-zero-valent iron particles is high, and electrons can be arbitrarily transferred to H 2 O, dissolved oxygen (DO) and nitrate (NO 3 - ) and other electron acceptors will consume a large amount of reducing power, reducing its

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  • Sulfide nanometer zero-valent iron particle as well as preparation method and application thereof
  • Sulfide nanometer zero-valent iron particle as well as preparation method and application thereof
  • Sulfide nanometer zero-valent iron particle as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A kind of sulfurized nano zero-valent iron particle, its preparation method comprises the following steps:

[0034] 1) 60 mL of FeCl with a concentration of 0.2 mol / L 2 The solution was added to the reactor, and 180 mL of NaBH with a concentration of 0.3 mol / L was added while stirring. 4 solution was added dropwise to FeCl 2 In the solution, after the dropwise addition, continue to stir and react for 15 minutes, then let it stand for precipitation, remove the supernatant, and wash the solid product 4 times with high-purity water to obtain nanometer zero-valent iron particles (nZVI);

[0035] 2) Disperse the nano-zero-valent iron particles in 420mL of ethanol, then add 0.0096g of elemental sulfur powder (the molar ratio of elemental sulfur powder to nano-zero-valent iron particles is 0.025:1), stir for 12h, and then fully stand, The supernatant was removed, and the solid product was washed 4 times with ethanol to obtain sulfide nano zero-valent iron particles (S-nZVI)....

Embodiment 2

[0050] With reference to the preparation method of Example 1, adjust the mol ratio of elemental sulfur powder and nanometer zero-valent iron particles (abbreviated as S / Fe mol ratio, respectively 0.015:1, 0.025:1, 0.05:1, 0.1:1 and 0.25:1 ), prepare the S-nZVI of different S / Fe mol ratios, then test the degradation effect of the S-nZVI of nZVI and different S / Fe mol ratios on TBBPA with reference to the method of Example 1, test result is as follows Figure 7 shown.

[0051] Depend on Figure 7 It can be seen that when the molar ratio of elemental sulfur powder and nanometer zero-valent iron particles is 0.025:1, the prepared S-nZVI has the best degradation effect on TBBPA.

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Abstract

The invention discloses a sulfide nanometer zero-valent iron particle as well as a preparation method and application thereof. The preparation method of the sulfide nanometer zero-valent iron particlecomprises the following steps: 1) reacting ferrite and NaBH4, and preparing nanometer zero-valent iron particles; and 2) coating the nanometer zero-valent iron particles with elemental sulfur powder,and preparing elemental sulfur coated nanometer zero-valent iron particles. The nanometer zero-valent iron particles are subjected to coating modification by taking the elemental sulfur powder as a sulfur source, the preparation method is mild in reaction conditions, simple in operation and low in production cost, and large-scale production is conveniently performed. Moreover, the prepared sulfide nanometer zero-valent iron particle has high selectivity on targeted pollutants and high reductive transformation efficiency, and can be applied to repair treatment of contaminated underground wateror soil on a large scale.

Description

technical field [0001] The invention relates to a sulfurized nanometer zero-valent iron particle and a preparation method and application thereof. Background technique [0002] Nano zero-valent iron particles are widely used in the treatment of polluted groundwater and soil, which has the following advantages: 1) Strong reducing ability; 2) After being used for pollutant treatment, it will transform itself into iron oxide, which has little impact on the environment ; 3) The particle size is small, the particle size is uniform, and the specific surface area is large; 4) It is easy to use, and it can be injected into the polluted groundwater or soil through the injection well to carry out in-situ repair, and it can contact the fine aquifer, and the pollution of the polluted water body The purification is more thorough. [0003] However, there are still the following defects and deficiencies in the practical application of nano-zero-valent iron particles: 1) Under the influenc...

Claims

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Application Information

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IPC IPC(8): C02F1/70B09C1/08C02F101/36C02F103/06B22F1/054B22F1/16
CPCC02F1/705B09C1/08B09C1/002C02F2101/36C02F2103/06B22F1/16B22F1/054B22F1/056B09C1/00B22F9/24C02F1/288C02F1/281B22F2301/35C01G49/12C01P2004/64C02F2103/007C01B6/15
Inventor 钟音王贺丽朱锡芬李丹
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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