Zero-valent iron agent modified by aromatic carboxylic acid, and preparation method and application thereof

A kind of aromatic carboxylic acid, zero-valent iron technology, applied in the field of environmental chemistry

Active Publication Date: 2021-09-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the total Cr content of the solution remains unchanged, only the Cr(VI) is reduced to Cr(III), and the molecules with the carboxyl functional group remain in the solution in a complex state and are not completely removed by precipitation.

Method used

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  • Zero-valent iron agent modified by aromatic carboxylic acid, and preparation method and application thereof
  • Zero-valent iron agent modified by aromatic carboxylic acid, and preparation method and application thereof
  • Zero-valent iron agent modified by aromatic carboxylic acid, and preparation method and application thereof

Examples

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preparation example Construction

[0061] The preparation method of micron zero-valent iron is as follows: (1) zirconia ball milling beads (6 mm in particle diameter) with 20% cavity volume are packed into a ball mill jar as a grinding medium; (2) 2.365 g of zero-valent iron powder (38 mm in particle diameter) Micron ~ 74 micron) placed in the ball mill tank, and filled with nitrogen in the tank; (3) Turn on the ball mill, adjust the grinding speed to 400rpm, and grind for 20 hours; (4) Under nitrogen atmosphere, use a screen to filter the prepared Micron zero-valent iron is separated from the grinding medium to obtain micron zero-valent iron.

[0062] The preparation method of nano zero-valent iron is as follows: take 110mL ultrapure aqueous solution and 0.7447g ferrous sulfate heptahydrate into a 250mL three-necked flask, add 40ml of 0.13M NaBH4 solution dropwise at a flow rate of 6ml / min, and perform a reduction reaction to synthesize nano The zero-valent iron solution is centrifuged and dried to obtain nano...

Embodiment 1

[0067] Take 110mL of 10mM phthalic acid solution and 0.7447g of ferrous sulfate heptahydrate in a 250mL three-neck flask, add 40ml of 0.13M NaBH dropwise at a flow rate of 6ml / min 4 Solution, carry out reduction reaction, to synthesize nano zero valent iron solution (nZVI solution); after 15min, add 2.14mL of Na 2 The S solution (8g / L) was mixed and reacted for 15 minutes; the whole process was mechanically stirred under anaerobic conditions, and finally a phthalic acid-modified sulfide nanometer zero-valent iron solution was obtained. After magnetic absorption and drying, aromatic carboxylic acid-modified solid sulfide nanometer zero-valent iron was obtained for characterization.

[0068] Table 1 and Figure 1~4 The following are the element mass analysis table, TEM diagram, Raman diagram, CP diagram and XPS diagram of the sulfide nano-zero-valent iron prepared in this embodiment in sequence. It can be calculated from Table 1 that the sulfur loading is close to 80% of the i...

Embodiment 2

[0072] Take 110mL of 10mM benzoic acid solution and 0.7447g of ferrous sulfate heptahydrate in a 250mL three-necked flask, add 40ml of 0.13M NaBH dropwise at a flow rate of 6ml / min 4 Solution, carry out reduction reaction to synthesize nZVI solution; add 2.14mL of Na after 15min 2 S solution (8g / L) was vulcanized for 15 minutes; the whole process was mechanically stirred under anaerobic conditions to obtain a benzoic acid-modified sulfidized nanometer zero-valent iron solution.

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Abstract

The invention discloses a preparation method of an aromatic carboxylic acid modified zero-valent iron agent. The method comprises the following steps: adding a zero-valent iron agent into a solvent under the condition of normal temperature by taking an aromatic carboxylic acid aqueous solution as the solvent, carrying out complexation reaction, and separating to obtain the aromatic carboxylic acid modified zero-valent iron agent, or sequentially or simultaneously adding sodium borohydride and a vulcanizing agent into a ferric salt and/or ferrous salt, carrying out reduction reaction and vulcanization reaction, and separating to obtain the aromatic carboxylic acid modified vulcanized nano zero-valent iron. Iron oxide, iron sulfide or iron nitride on the surface of the aromatic carboxylic acid modified zero-valent iron agent is complexed with carboxyl functional groups in aromatic carboxylic acid, so that passivation of zero-valent iron is inhibited, more electrons can be released to degrade pollutants, and the degradation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, in particular to an aromatic carboxylic acid-modified zero-valent iron agent and a preparation method and application thereof. Background technique [0002] In recent years, the polluted sites left by the relocation of enterprises have become an important factor restricting the reuse of urban land resources; and zero-valent iron particles are currently the only low-disturbance in-situ repair material that is practically used, and it can provide sufficient electrons to effectively restore Various pollutants, including organic, inorganic and heavy metal pollutants. At present, the zero-valent iron permeable reactive wall (PRB) has been applied in hundreds of projects around the world. However, due to the limitation of construction cost, technology and low activity of zero-valent iron with large particle size, this method is not suitable for deep layer, groundwater under structures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70B82Y30/00B82Y40/00C02F101/10C02F101/20C02F101/22C02F101/30C02F101/36C02F101/38
CPCC02F1/705B82Y30/00B82Y40/00C02F2101/20C02F2101/22C02F2101/103C02F2101/36C02F2101/308C02F2101/38C02F2305/08
Inventor 何锋许文强夏晨芸
Owner ZHEJIANG UNIV OF TECH
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