Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal
Nanocomposites containing magnetic iron oxide (magnetite) nanoparticles and layered double hydroxide (LDH) nanosheets were prepared by two different methods, exfoliation-reassembly and coprecipitation, for aqueous chromate adsorbent. According to X-ray diffraction, scanning electron microscopy, and...
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doaj-8fa3cc06fe814a3eb9ba3010325e3f252020-11-24T22:27:40ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292016-01-01201610.1155/2016/80326158032615Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate RemovalGyeong-Hyeon Gwak0Min-Kyu Kim1Jae-Min Oh2Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University, Wonju, Gangwon-do 26493, Republic of KoreaDepartment of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University, Wonju, Gangwon-do 26493, Republic of KoreaDepartment of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University, Wonju, Gangwon-do 26493, Republic of KoreaNanocomposites containing magnetic iron oxide (magnetite) nanoparticles and layered double hydroxide (LDH) nanosheets were prepared by two different methods, exfoliation-reassembly and coprecipitation, for aqueous chromate adsorbent. According to X-ray diffraction, scanning electron microscopy, and atomic force microscopy, both nanocomposites were determined to develop different nanostructures; LDH nanosheets well covered magnetite nanoparticles with house-of-cards-like structure in exfoliation-reassembly method, while coprecipitation resulted in LDH particle formation along with magnetite nanoparticles. Zeta-potential measurement also revealed that the magnetite surface was effectively covered by LDH moiety in exfoliation-reassembly compared with coprecipitation. Time, pH, concentration dependent chromate adsorption tests, and magnetic separation experiments exhibited that both nanocomposites effectively adsorb and easily collect chromate. However, exfoliation-reassembly nanocomposite was determined to be slightly effective in chromate removal by ~10%. Chromate adsorbed nanocomposites could be regenerated by treating with bicarbonate and the regenerated nanocomposites preserved ~80% of chromate adsorption efficacy after three times of recycling.http://dx.doi.org/10.1155/2016/8032615 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Gyeong-Hyeon Gwak Min-Kyu Kim Jae-Min Oh |
spellingShingle |
Gyeong-Hyeon Gwak Min-Kyu Kim Jae-Min Oh Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal Journal of Nanomaterials |
author_facet |
Gyeong-Hyeon Gwak Min-Kyu Kim Jae-Min Oh |
author_sort |
Gyeong-Hyeon Gwak |
title |
Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal |
title_short |
Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal |
title_full |
Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal |
title_fullStr |
Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal |
title_full_unstemmed |
Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal |
title_sort |
nanocomposites of magnetite and layered double hydroxide for recyclable chromate removal |
publisher |
Hindawi Limited |
series |
Journal of Nanomaterials |
issn |
1687-4110 1687-4129 |
publishDate |
2016-01-01 |
description |
Nanocomposites containing magnetic iron oxide (magnetite) nanoparticles and layered double hydroxide (LDH) nanosheets were prepared by two different methods, exfoliation-reassembly and coprecipitation, for aqueous chromate adsorbent. According to X-ray diffraction, scanning electron microscopy, and atomic force microscopy, both nanocomposites were determined to develop different nanostructures; LDH nanosheets well covered magnetite nanoparticles with house-of-cards-like structure in exfoliation-reassembly method, while coprecipitation resulted in LDH particle formation along with magnetite nanoparticles. Zeta-potential measurement also revealed that the magnetite surface was effectively covered by LDH moiety in exfoliation-reassembly compared with coprecipitation. Time, pH, concentration dependent chromate adsorption tests, and magnetic separation experiments exhibited that both nanocomposites effectively adsorb and easily collect chromate. However, exfoliation-reassembly nanocomposite was determined to be slightly effective in chromate removal by ~10%. Chromate adsorbed nanocomposites could be regenerated by treating with bicarbonate and the regenerated nanocomposites preserved ~80% of chromate adsorption efficacy after three times of recycling. |
url |
http://dx.doi.org/10.1155/2016/8032615 |
work_keys_str_mv |
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