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Preparation method of dispersant modified iron nanoparticles

A dispersant and nano-iron technology, applied in the field of preparation of nano-iron particles, can solve the problems of dechlorination system promotion or inhibition, insufficient use of surfactants, control of nano-particle size, etc., and achieve easy engineering. Application, improved stability, enhanced surface attractive effect

Inactive Publication Date: 2012-08-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitations are: on the one hand, there are many types of surfactants, and their promotion or inhibition on the dechlorination system is still controversial; on the other hand, the current application does not make full use of surfactants to control the size of nanoparticles and the stability of dispersion. sex
[0007] (3) Polymers such as polyethylene glycol, polyacrylic acid, carboxymethylcellulose, polyvinylpyrrolidone, etc. have played an important role in reducing the size of nano-palladium / iron bimetallic particles and enhancing their dispersion stability, but The concentration and dosage of polymer modified nanoparticles, the existing form of the polymer, and the complexity of the synthesis method have become one of the barriers to the application of this technology.
[0008] (4) The load fixation method can effectively control the size of nanoparticles and maintain a certain dispersion stability, but there are still big problems in the selection of carrier materials and their own hydrophilic modification, regeneration, etc., and the load fixation When the modified nano-iron particles are applied to the in-situ remediation of soil or groundwater, they still encounter problems such as low hydraulic conductivity and poor transportability, which makes this modification method difficult to popularize and apply.
However, the preparation process of this method must be through in-situ polymerization to realize the modification of nano-iron by PMMA.

Method used

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  • Preparation method of dispersant modified iron nanoparticles
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  • Preparation method of dispersant modified iron nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of polymethyl methacrylate PMMA dispersed modified nano-iron particles and their removal of various chlorinated organics in water, the specific contents are as follows:

[0036] (1) Preparation of PMMA dispersed modified iron nanoparticles and its dechlorination effect

[0037] Get the anisole solution 10mL and the 200mL concentration that is 7% PMMA by mass percent and be 0.1mol / L FeSO 4 After the solution is mixed, stir for 10 minutes, and add an excess of 0.2mol / L KBH dropwise to the above mixed solution 4 Add the solution to 200mL and stir. After the dropwise addition, delay stirring for 15 minutes until the reaction is complete, filter and drain through a vacuum filtration device, wash with deionized water for 3 times, and filter until dry, and then wash with absolute ethanol for 3 times , washed once with acetone, dried and put into a vacuum drying oven at 100°C to dry for 6 hours, ground under nitrogen, sealed and stored to obtain PMMA dis...

Embodiment 2

[0043] Embodiment 2: the preparation of PMMA dispersion modified nano-palladium / iron particles and its removal of various chlorinated organics in water, the specific contents are as follows:

[0044] (1) Preparation of PMMA dispersed modified nano-palladium / iron bimetallic particles and its dechlorination effect

[0045] Get the anisole solution 10mL and 200mL concentration that is 8% PMMA of mass percent and be 0.1mol / L FeSO 4 After the solution is mixed, stir for 10 minutes, and add an excess of 0.2mol / LKBH dropwise to the above mixed solution 4 Add the solution to 200mL and stir. After the dropwise addition, delay stirring for 15 minutes until the reaction is complete, filter and drain through a vacuum filter device, wash with deionized water for 3 times, and pour the zero-valent nano-iron particles obtained by draining into palladium acetate In the ethanol solution, react under magnetic stirring for 30min, place the reaction product in a sand core filter device and filter...

Embodiment 3

[0050] Example 3: Preparation of CTAB dispersed modified nano-nickel / iron particles and their removal of various chlorinated organics in water, the specific contents are as follows:

[0051] (1) Preparation of nano-nickel / iron bimetallic particles modified by CTAB dispersion and its dechlorination effect

[0052] Take 10mL of 10% cetyltrimethylammonium bromide solution (with 70% ethanol as solvent) and 250mL of 0.15mol / L FeSO 4 After the solution is mixed, stir for 10 minutes, and add an excess of 0.3mol / LKBH dropwise to the above mixed solution 4 Add the solution to 200mL and stir. After the dropwise addition, delay stirring for 12 minutes until the reaction is complete, filter and drain through a vacuum filter device, wash with deionized water twice, and immerse the zero-valent nano-iron particles obtained by draining to a concentration of 120mg / L nickel chloride (NiCl 2 ) solution, reacted for 30 minutes under magnetic stirring, put the reaction product in a sand core fi...

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Abstract

The invention discloses a preparation method of dispersant modified iron nanoparticles. According to the preparation method, high polymer, a cationic surfactant or anionic polymer electrolyte is used as a dispersant to perform surface modification on particles in a preparation process of the iron nanoparticles so as to prepare the dispersant modified iron nanoparticles. The iron nanoparticles prepared by the method have good dispersion stability; the hard agglomeration of the iron nanoparticles in an aqueous medium is reduced; the dispersion degree of the iron nanoparticles is increased; the method can also be used for performing dispersion modification on iron base bimetallic particles; and the method can be applied to pollution remediation of chlorinated organic compounds in an environmental medium and has broad application prospect.

Description

technical field [0001] The invention relates to a method for preparing nano-iron particles modified by a dispersant, and belongs to the technical field of nano-materials and water pollution control. Background technique [0002] Chlorinated organic compounds refer to products in which one or more hydrogens in the molecular structure of aliphatic hydrocarbons, aromatic hydrocarbons and their derivatives are replaced by chlorine. It accumulates in the body through skin absorption, etc., resulting in the "three effects" of teratogenicity, carcinogenicity, and mutagenicity. The potential risks to the environment and health are extremely high, and it has become one of the hot issues in current research. [0003] Traditional pollution control methods include physical, biological and chemical methods. Among them, the chemical reduction method, especially the zero-valent iron reduction method, has gradually replaced the traditional pollution control technology since it was discover...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/02B01J23/745B01J23/89B01J23/80B01J23/755B01J35/10C02F1/70C02F101/36
Inventor 王向宇祝敏平李芳
Owner KUNMING UNIV OF SCI & TECH
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