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Preparation method of polyglutamic acid modified nanoscale Fe/Pd nanoparticles and application in dechlorination of organic chlorides

A polyglutamic acid and nanoparticle technology, which is applied in the field of water pollution treatment, can solve the problems of inhibiting reaction activity, easily corroded by water, low dechlorination activity, etc., and achieves improved reaction rate constant, good colloidal stability, and good reduction. effect of effect

Active Publication Date: 2018-12-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The dechlorination activity of unmodified or modified zero-valent nano-iron is low, and it is easy to aggregate under the action of van der Waals force and magnetic force to further reduce the reactivity
First of all, nano-zero-valent iron is easily corroded by water and loses the ability to degrade pollutants; in addition, nano-zero-valent iron particles have a small specific surface area, so they have high surface energy. In addition, iron itself is magnetic, and nano-zero-valent iron is easy to Aggregate deposition, which not only reduces the mobility of nano-zero-valent iron in the aqueous phase, but also inhibits its reactivity

Method used

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  • Preparation method of polyglutamic acid modified nanoscale Fe/Pd nanoparticles and application in dechlorination of organic chlorides
  • Preparation method of polyglutamic acid modified nanoscale Fe/Pd nanoparticles and application in dechlorination of organic chlorides
  • Preparation method of polyglutamic acid modified nanoscale Fe/Pd nanoparticles and application in dechlorination of organic chlorides

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Embodiment 1

[0024] A method for preparing polyglutamic acid-modified nanoscale Fe / Pd nanoparticles, comprising the following steps:

[0025] 1) First weigh 10 mg, 25 mg, and 50 mg of polyglutamic acid (PGA), respectively, and dissolve them in 50 mL of water to prepare four polyglutamic acid solutions. Add 250 mg of ferrous sulfate to the acid solution (the mass ratios of PGA to Fe are 19.9:100, 49.7:100, and 99.5:100), and mix polyglutamic acid and iron salt for 5 minutes to obtain 3 solutions;

[0026] 2) Add 3 mL of freshly prepared potassium borohydride solution (the molar ratio of potassium borohydride to soluble iron salt is 3:1) with a concentration of 50 mg / mL to each solution obtained in step 1) and stir rapidly to react Generate nano-scale zero-valent iron particles modified by polyglutamic acid, and continue to feed argon for 20 minutes to remove the hydrogen generated by the reaction and ensure the sufficient decomposition of excess potassium borohydride;

[0027] 3) 400 micro...

Embodiment 2

[0033] A method for preparing polyglutamic acid-modified nanoscale Fe / Pd nanoparticles, comprising the following steps:

[0034] 1) First weigh 10 mg, 25 mg, and 50 mg of polyglutamic acid (PGA), respectively, and dissolve them in 50 mL of water to prepare four polyglutamic acid solutions. Add 120 mg of ferrous chloride (PGA / Fe mass ratios are 17:100, 48:100, 95:100 respectively) to the acid solution, and mix polyglutamic acid and iron salt for 5 minutes to obtain 3 solutions;

[0035] 2) Add 1 mL of freshly prepared potassium borohydride solution (the molar ratio of potassium borohydride to soluble iron salt is 1:1) with a concentration of 50 mg / mL to the three solutions obtained in step 1) respectively, and stir rapidly to react Generate nano-scale zero-valent iron particles modified by polyglutamic acid, and continue to feed argon for 20 minutes to remove the hydrogen generated by the reaction and ensure the sufficient decomposition of excess potassium borohydride;

[0036...

Embodiment 3

[0041] A method for preparing polyglutamic acid-modified nanoscale Fe / Pd nanoparticles, comprising the following steps:

[0042] 1) First weigh 10 mg, 25 mg, and 50 mg of polyglutamic acid (PGA), respectively, and dissolve them in 50 mL of water to prepare four polyglutamic acid solutions. Add 150 mg of ferric chloride (PGA / Fe mass ratios are 18:100, 47:100, 98:100 respectively) to the acid solution, and mix polyglutamic acid and iron salt for 5 minutes to obtain 3 solutions;

[0043] 2) Rapidly add 5 mL of freshly prepared potassium borohydride solution (the molar ratio of potassium borohydride to soluble iron salt is 5:1) with a concentration of 50 mg / mL to the three solutions obtained in step 1) and stir rapidly to react Generate nano-scale zero-valent iron particles modified by polyglutamic acid, and continue to feed argon for 20 minutes to remove the hydrogen generated by the reaction and ensure the sufficient decomposition of excess potassium borohydride;

[0044] 3) 20...

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Abstract

The invention discloses a preparation method of polyglutamic acid modified Fe / Pd nanoparticles. The method includes: 1) under argon protection, adding a soluble iron salt into a polyglutamic acid aqueous solution to obtain a mixed solution, wherein the mass ratio of PGA / Fe is (10-100):100; 2) adding a potassium borohydride aqueous solution into the mixed solution, and carrying out reaction to produce polyglutamic acid modified nanoscale zero-valent iron particles, wherein the potassium borohydride and soluble iron salt are in a mole ratio of (1-6):1; and 3) adding a potassium chloropalladite aqueous solution into the solution containing the nanoscale zero-valent iron particles in step 2), and carrying out reaction to obtain the polyglutamic acid modified Fe / Pd nanoparticles. Specifically,the potassium chloropalladite and the soluble iron salt are in a mass ratio of (1-10):5000. The bimetallic nanoparticles prepared according to the method provided by the invention have high dechlorination activity and show excellent dechlorination effect on chlorinated aromatic hydrocarbon and polychlorohydrocarbon.

Description

technical field [0001] The invention relates to the field of water pollution treatment, in particular to a method for preparing polyglutamic acid-modified iron-palladium (Fe / Pd) nanoparticles and its application in dechlorination of organic chlorides. Background technique [0002] As a kind of persistent organic pollutants (POPs), organic chlorides that are difficult to degrade naturally can diffuse and migrate around the world, causing a wider range of harm to human health and the natural environment. Therefore, the effective degradation and removal of organic chlorides in heavily polluted environmental systems such as water bodies and soils is an urgent problem related to the long-term development of human beings. [0003] Since the 1990s, the application of zero-valent nano-iron materials in the degradation of environmental pollutants and environmental restoration of water and soil has received continuous attention and research. Zero-valent iron nanomaterials are widely ...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F101/36
CPCC02F1/56C02F2101/36
Inventor 黄仁亮苏荣欣张诗雨张超齐崴
Owner TIANJIN UNIV
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