TY - JOUR
T1 - Nanocomposites of Magnetite and Layered Double Hydroxide for Recyclable Chromate Removal
AU - Gwak, Gyeong Hyeon
AU - Kim, Min Kyu
AU - Oh, Jae Min
N1 - Publisher Copyright:
© 2016 Gyeong-Hyeon Gwak et al.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84999751897&partnerID=8YFLogxK
U2 - 10.1155/2016/8032615
DO - 10.1155/2016/8032615
M3 - Article
AN - SCOPUS:84999751897
SN - 1687-4110
VL - 2016
JO - Journal of Nanomaterials
JF - Journal of Nanomaterials
M1 - 8032615
ER -