Process for obtaining nanocomposites, nanocomposite, method of capture and retrieval of a solubilized and/or dispersed material in organic or inorganic medium, method of purification of an organic or inorganic medium and capture and retrieval kit for a solubilized and/or dispersed material in organic or inorganic medium

Patent metadata

Field	Value
Publication number	US-10086358-B2
Application number	US-201514737045-A
Country	US
Kind code	B2
Filing date	Jun 11, 2015
Priority date	Jun 20, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

The present invention lies in the fields of chemistry and nanotechnology and describes a nanocomposite to be used in the recovery of several compounds from inorganic or organic medium. Specifically, the invention presents a nanocomposite consisting of magnetic nanoparticles composed of Fe 3 O 4 associated to an activated charcoal adsorbent substrate, a process to obtain and methods of use of the nanocomposite. The present invention enables the processing, concentration and recovery of large volumes of contaminated water, regenerating magnetic adsorbent material for reuse, in a cyclic and sustainable manner, transforming dispersed/diluted pollutants in pre-concentrates that can be easily processed, helping to conserve natural resources.

First claim

The invention claimed is:

1. Nanocomposite, characterized by being obtained by a process comprising the following steps:
adding magnetite nanoparticles to a medium containing organic solvents;
adding at least one adsorbent substrate; and
applying heating and/or reflux,
the nanocomposite comprising Fe 3 O 4 magnetic nanoparticles associated with an adsorbent substrate in which the adsorbent substrate surfaces, and optionally the nanoparticles surfaces, are independently modified with at least one selected from the group consisting of aliphatic carboxylic acids, olefinic compounds, alkyl-aromatics, silanes, phosphonates, and phosphates,
wherein the adsorbent substrate is activated charcoal, and
wherein the nanoparticles have a high saturation magnetization of between 40 and 80 emu/g.

2. Nanocomposite, according to claim 1 , characterized by the independent modification of nanoparticles and/or the adsorbent substrate with at least one selected from the group consisting of oleic acid, lignoceric acid, behenic acid, cerotic acid, arachidic acid, stearic acid, palmitic acid, myristic acid, lauric acid, capric acid, caprylic acid, palmitoleic acid, myristoleic acid, linoleic acid, aryl-silanes, alkyl-silanes, aryl-phosphonates, alkyl-phosphonates, aryl-phosphates, and alkyl-phosphates.

3. Nanocomposite, according to claim 1 , characterized by the ability to be dispersible in organic or inorganic liquid medium and recoverable by applying a magnetic field.

Assignees

• Petroleo Brasileiro Sa Petrobras
• Univ Sao Paulo
• Petroleo Brasileiro Sa Petrobras

Inventors

• Araki Koiti
• Epamino Ulisses Condomitti
• Silveira Junior Alceu Totti
• Toma Sergio Hiroshi
• Toma Henrique Eisi

Classifications

• B01J20/28016

  Particle form · CPC title

• B01J20/28009

  Magnetic properties · CPC title

• B01J20/205 Primary

  Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs (carbon nanotubes per se C01B32/15) · CPC title

• C02F2101/305

  Endocrine disruptive agents · CPC title

• B01J20/06

  comprising oxides or hydroxides of metals not provided for in group B01J20/04 · CPC title