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Dispersant modified nano zero-valent iron and preparing method and application thereof

A nano-zero-valent iron and dispersant technology, applied in the direction of nanotechnology, to achieve the effect of simple operation, high reactivity, and improved mass transfer efficiency

Active Publication Date: 2016-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature search shows that the preparation of nanometer zero-valent iron modified with p-hydroxyanisole and polyethyleneimine has not been reported yet.

Method used

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  • Dispersant modified nano zero-valent iron and preparing method and application thereof
  • Dispersant modified nano zero-valent iron and preparing method and application thereof
  • Dispersant modified nano zero-valent iron and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of modified nano-zero-valent iron and ordinary unmodified nano-zero-valent iron and their transmission electron microscope characterization

[0034] (1) Preparation of MEHQ modified iron nanoparticles

[0035] Take 10 mL of MEHQ ethanol solution with a concentration of 1 g / L and mix it with 100 mL of a 0.5 mol / L FeSO4 solution, stir for 30 min, and add 1 mol / L KBH dropwise to the above mixed solution 4 The solution was 150mL and stirred. After the dropwise addition, delay stirring for 5min until the reaction was complete. The reacted solution was filtered with a Buchner funnel equipped with a 0.22 micron water-based microporous membrane, washed 3 times with deionized water, and suction filtered. until dry, move the obtained particles into 100mL of absolute ethanol and stir for 10min, then filter with a sand core filter device, after filtration, wash with absolute ethanol for 3 times, acetone for 1 time, and dry the obtained nanometer zero-valent ...

Embodiment 2

[0041] Example 2: Preparation and infrared spectrogram characterization of modified nano-zero-valent iron and ordinary unmodified nano-zero-valent iron

[0042] (1) Preparation of MEHQ modified iron nanoparticles

[0043] Take 10mL of MEHQ ethanol solution with a concentration of 7g / L and 100mL with a concentration of 0.5mol / LFeSO 4 After the solution is mixed, stir for 30min, add 1mol / LKBH dropwise to the above mixed solution 4 Add the solution to 150mL and stir. After the dropwise addition, delay stirring for 10min until the reaction is complete. Filter the reacted solution with a Buchner funnel equipped with a 0.22 micron water-based microporous filter membrane, wash it twice with deionized water, and pump Filter until dry, move the obtained particles into 100mL of absolute ethanol and stir for 5min, then filter with a sand core filter device, after filtration, wash twice with absolute ethanol and twice with acetone, and dry the obtained nano zero The valence iron particl...

Embodiment 3

[0049] Example 3: Preparation of MEHQ-modified nano-iron particles and PEI-modified nano-iron particles and their removal of hexavalent chromium

[0050] (1) Preparation of MEHQ modified nano-iron particles and its removal effect on hexavalent chromium (Cr(VI))

[0051] Take 10mL of MEHQ ethanol solution with a concentration of 3g / L and 150mL with a concentration of 1mol / LFeSO 4 After the solution is mixed, stir for 30min, add 0.5mol / LKBH dropwise to the above mixed solution 4 Add the solution to 200mL and stir. After the dropwise addition, delay stirring for 8min until the reaction is complete. Filter the reacted solution with a Buchner funnel equipped with a 0.22 micron water-based microporous filter membrane, wash it with deionized water for 3 times, and pump Filter until dry, move the obtained particles into 100mL of absolute ethanol and stir for 8min, then filter with a sand core filter device, after filtration, wash with absolute ethanol for 3 times, acetone for 2 times...

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Abstract

The invention discloses a preparing method for dispersant modified nano zero-valent iron. Through a polymerization inhibitor, MEHQ or PEI serves as a dispersant to modify nano zero-valent iron; through the space steric hindrance effect and the electrostatic steric hindrance effect, the agglomeration phenomenon of the nano zero-valent iron is reduced; in the preparing process of the nano zero-valent iron, the surface of the nano zero-valent iron is modified, agglomeration of the nano zero-valent iron is reduced, dispersibility of the nano zero-valent iron is improved, and the nano zero-valent iron with the higher dispersibility is prepared; nano zero-valent iron particles prepared through the method have the good dispersion stability, inoxidizability and higher reducibility; in the synthetic process of the nano zero-valent iron particles, protection by nitrogen or other inert gases is not needed; and the method is low in cost, easy to operate and environment-friendly. Chlorinated organic compounds, heavy metal, antibiotics, coloring matter and the like in water can be effectively degraded, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to modifying nano zero-valent iron with two new dispersants to achieve the purpose of improving the dispersion degree of nano zero-valent iron particles in the liquid phase, improving its oxidation resistance and reactivity, and applying it to In the treatment of wastewater containing heavy metals, dyes, antibiotics, chlorinated organics and other pollutants. Background technique [0002] In the late 1980s, nano-zero-valent iron technology began to receive widespread attention in the field of environmental science and engineering, which further provided new ideas for the study of microscopic processes and mechanisms of environmental pollution phenomena; nano-zero-valent iron has strong reducibility and mobility It has become a research hotspot in environmental pollution control and is widely used in the control of polluted soil and groundwater. The outstanding advantages of nano-zero-valent iron technology are reflected in: the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB82Y40/00B22F9/24
Inventor 王向宇乐兰
Owner KUNMING UNIV OF SCI & TECH
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