Green synthesis of nanometals using plant extracts and use thereof

A plant extract, metal technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as expensive, high energy consumption, toxic chemical solvents, etc.

Inactive Publication Date: 2011-09-28
VERUTEK TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commercial significance of nanoparticles is limited by nanoparticle synthesis met...

Method used

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  • Green synthesis of nanometals using plant extracts and use thereof
  • Green synthesis of nanometals using plant extracts and use thereof
  • Green synthesis of nanometals using plant extracts and use thereof

Examples

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Embodiment 1

[0101] Example 1: Green synthesis of nanoscale zero-valent iron (NZVI) or manganese (NZVMn)

[0102] The method according to the invention uses plant extracts containing reducing agents capable of forming nanoparticles in the presence of dissolved iron species. The reaction is almost instantaneous when the reducing agent-containing plant extract is mixed with dissolved iron or manganese species. Phytoreductants are mainly composed of phenolic compounds and flavonoids. An example of dissolved iron is ferric chloride (FeCl 3 ), ferrous sulfate (FeSO 4 ) and ferric nitrate (Fe(NO 3 ) 3 ). An example of a dissolved manganese species is manganese chloride (MnCl 2 ) and manganese sulfate (MnSO 4 ).

[0103] This green synthetic route using phytoreductants could replace milling or solution-based preparation of these materials with green synthetic methods. This approach eliminates toxic materials used in the traditional preparation of zero-valent metal nanoparticles (ie, nZ...

Embodiment 2

[0105] Example 2: Synthesis of metal nanoparticles using plant-based surfactants and / or co-solvents

[0106] The method according to the invention involves the green synthesis of metal nanoparticles in the presence of plant-based co-solvents and surfactants. The plant-based co-solvents and surfactants can be used to stabilize metal nanoparticles and minimize their aggregation, and they can also be used as reducing agents in the formation of metal nanoparticles. These plant-based co-solvents and surfactants are of natural origin and may be biodegradable.

[0107] Examples of plant-based co-solvents and surfactants that can be used are VerTEK US FDA generally recognized as safe (GRAS) co-solvents and surfactants for enhancing the solubility of LNAPL and DNAPL during oxidation and reduction reactions. Examples of plant-based co-solvents and surfactants that can be used include VeruSOL TM , Citrus Burst 1 (CB-1), Citrus Burst 2 (CB-2), Citrus Burst 3 (CB-3) and EZ-Mulse, produ...

Embodiment 3

[0115] Example 3: Coating of NZVI, NZVMn, and bimetallic NZVI, NZVMn

[0116] The use of nanoparticulate zerovalent iron (nZVI) and nanoparticulate zerovalent manganese (nZVMn) can be limited in environmental applications because they can show a tendency to agglomerate into micron-sized particles, thereby losing their surface area versus mass some of the benefits. Additionally, nZVI and nZVMn particles can be highly reactive and their surfaces can be rapidly passivated and oxidized. In many applications, including those used in remediation, it is required that these particles be present and remain reactive for many months or even years. Coating nZVI and nZVMn particles can reduce the rapid aggregation, oxidation and passivation of nanoscale particles.

[0117] In the green approach according to some embodiments of the present invention, biodegradable polymers such as carboxymethylcellulose (CMC) can be used at room temperature by reacting each metal salt with the sodium sa...

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Abstract

The present invention relates to methods of making and using and compositions of metal nanoparticles formed by green chemistry synthetic techniques. For example, the present invention relates to metal nanoparticles formed with solutions of plant extracts and use of these metal nanoparticles in removing contaminants from soil and groundwater and other contaminated sites. In some embodiments, the invention comprises methods of making and using compositions of metal nanoparticles formed using green chemistry techniques.

Description

technical field [0001] The present invention relates to methods of making and using compositions of metal nanoparticles formed by green chemical synthesis techniques. For example, the invention relates to metal nanoparticles formed using solutions of plant extracts and the use of these metal nanoparticles in the removal of pollutants from soil and groundwater. [0002] Aspects of this invention were made with United States Government support, and the United States Government may have certain rights in this invention. Background technique [0003] Nanoparticles are particles with a diameter in the size range of 1 nm to 1 μm. "Nano" means one billionth of something (10 -9 ) part of the prefix (Meridian Webster Dictionary). In recent years, the field of nanoparticles has grown due to their unique properties. Numerous industries utilize nanoparticles, such as the electronics industry, medical science, material science, and environmental science. Noble metal nanoparticles ha...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24B82B1/00B22F1/054
CPCB22F9/24B22F1/0018B82Y30/00B22F1/054B22F1/056
Inventor 乔治.E.霍格约翰.B.科林斯雷詹德.S.瓦马马利卡朱纳.纳达古达
Owner VERUTEK TECH
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