TY - JOUR
T1 - Synthesis of a unique nanostructured magnesium oxide coated magnetite cluster composite and its application for the removal of selected heavy metals
AU - Nagarajah, Ranjini
AU - Wong, Kien Tiek
AU - Lee, Gooyong
AU - Chu, Kyoung Hoon
AU - Yoon, Yeomin
AU - Kim, Nam Chan
AU - Jang, Min
N1 - Funding Information:
The present has been conducted by the Research Grant of Kwangwoon University in 2016 and an Exploratory Research Grant Scheme (ERGS) grant funded by the government of Malaysia (MOHE) , No. ER009-2013A .
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - The removal of heavy metal such as lead (Pb), cadmium (Cd), and copper (Cu) was assessed using magnesium oxide cores with silica coated nano-magnetite (MTM) prepared by a simple method using chemicals such as iron(II) sulfate heptahydrate (FeSO4·7H2O), magnesium (II) nitrate hexahydrate [Mg(NO3)2·6H2O], tetraethyl orthosilicate (TEOS), and urea. The MTM was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and alternating gradient magnetometer (AGM) analyses. The isotherm, kinetic, and intra-particle diffusion studies indicated that the MTM had excellent removal capacities towards heavy metals (Pb, Cd, Cu) and the adsorption capacities were as high as 238 mg g−1 (1.15 mmol g−1) for Pb, 85.1 mg g−1 (0.75 mmol g−1) for Cd, and 33.5 mg g−1 (0.5 mmol g−1) for Cu. The intra-particle diffusion, FE-SEM, XPS, and XRD results indicated that the mechanism of heavy metal removal was mainly substitution, followed by precipitation. A leaching test revealed that MTM showed no leaching of Fe ions at pH > 2. This material is cheap, simple, and can be produced in massive amounts. MTM can be used for the large-scale remediation of waste water containing heavy metals via applying a simple and fast magnetic separation.
AB - The removal of heavy metal such as lead (Pb), cadmium (Cd), and copper (Cu) was assessed using magnesium oxide cores with silica coated nano-magnetite (MTM) prepared by a simple method using chemicals such as iron(II) sulfate heptahydrate (FeSO4·7H2O), magnesium (II) nitrate hexahydrate [Mg(NO3)2·6H2O], tetraethyl orthosilicate (TEOS), and urea. The MTM was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and alternating gradient magnetometer (AGM) analyses. The isotherm, kinetic, and intra-particle diffusion studies indicated that the MTM had excellent removal capacities towards heavy metals (Pb, Cd, Cu) and the adsorption capacities were as high as 238 mg g−1 (1.15 mmol g−1) for Pb, 85.1 mg g−1 (0.75 mmol g−1) for Cd, and 33.5 mg g−1 (0.5 mmol g−1) for Cu. The intra-particle diffusion, FE-SEM, XPS, and XRD results indicated that the mechanism of heavy metal removal was mainly substitution, followed by precipitation. A leaching test revealed that MTM showed no leaching of Fe ions at pH > 2. This material is cheap, simple, and can be produced in massive amounts. MTM can be used for the large-scale remediation of waste water containing heavy metals via applying a simple and fast magnetic separation.
KW - Cluster
KW - Composite
KW - Heavy metals
KW - Magnesium oxide
KW - Magnetite
UR - http://www.scopus.com/inward/record.url?scp=84995793041&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2016.11.008
DO - 10.1016/j.seppur.2016.11.008
M3 - Article
AN - SCOPUS:84995793041
SN - 1383-5866
VL - 174
SP - 290
EP - 300
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -