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3-D self-assembly of flower-like particles via microwave irradiation for water treatment

Jung, Y and Son, YH and Lee, JK (2012) 3-D self-assembly of flower-like particles via microwave irradiation for water treatment. RSC Advances, 2 (13). 5877 - 5884.

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Abstract

Three-dimensional (3-D) flower-like shape (FLS) Fe 3O 4 and Fe particles were successfully synthesized using FLS precursor particles that are prepared through a facile microwave-assisted reaction. The mechanism underlying the self-assembly process and shape evolution of FLS particles was systematically investigated by changing reaction parameters such as reaction temperature, reaction time and reaction pressure. During the reaction, iron alkoxide, α-Fe 2O 3 and FeOOH nanoparticles are formed first and are subsequently transformed to 3-D hierarchical FLS particles by the self-assembly of the primary nanoparticles. Reaction temperature and pressure play critical roles in the formation of the hierarchical flower-like superstructure. There is an optimum window of the reaction temperature (∼180 °C) for the formation of 3-D FLS particles, which is attributed to the competition between the self-assembly process and growth process of the nanoparticles. Also, since FeCl 3, ethylene glycol, and urea are used together as raw materials, the appearance of FLS particles is strongly dependent on the reaction pressure. As the reaction pressure becomes larger than 1 MPa, the flake type particles become more thermodynamically favorable than the FLS particles, due to the limited decomposition of urea. Brunauer-Emmett-Teller (BET) analysis shows that FLS particles have a large surface area (>40 m 2 g -1). Because of their high specific surface area and intrinsic reactivity, FLS particles efficiently remove sulfur ions in aqueous solution. This suggests that these flower-like particles can be promising materials to treat toxic gas such as H 2S in an environment-friendly way. © 2012 The Royal Society of Chemistry.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Jung, Y
Son, YH
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, or Units > Petersen Institute of NanoScience and Engineering
Date: 7 July 2012
Date Type: Publication
Journal or Publication Title: RSC Advances
Volume: 2
Number: 13
Page Range: 5877 - 5884
DOI or Unique Handle: 10.1039/c2ra20500a
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
Date Deposited: 21 Oct 2014 17:18
Last Modified: 02 Feb 2019 21:55
URI: http://d-scholarship.pitt.edu/id/eprint/23371

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