TY - JOUR
T1 - Successive removal of Pb2+ and Congo red by magnetic phosphate nanocomposites from aqueous solution
AU - Zhang, Fan
AU - Tang, Xiaoxiu
AU - Lan, Jing
AU - Huang, Yuxiong
PY - 2019/3/25
Y1 - 2019/3/25
N2 - The successive removal of Pb2+ and Congo red (CR) from aqueous solution by three magnetic phosphate nanocomposites (Fe3O4@Sr5(PO4)3(OH), Fe3O4@Ba3(PO4)2, and Fe3O4@Sr5xBa3x(PO4)3(OH), denominated FSP, FBP, and FSBP, respectively) was systematically investigated in comparison with Fe3O4 (denominated F) nanoparticle. FSP, FSBP, F, and FBP exhibited a high removal capacity of 351, 272, 76, and 23 mg/g for Pb2+, respectively. These materials could be reclaimed by magnetic separation and then used for successive CR remediation, showing a high CR removal capacity of 224, 163, 126, and 61 mg/g, respectively. The isothermal and kinetic behavior fitted well with the Langmuir model and pseudo-second-order model, respectively. The successive removal mechanism by these magnetic phosphates was proposed to be the ion exchange between Pb2+ and Sr2+ in the lattice and then the loaded Pb2+ could contact with anionic dye CR to form precipitation on the surface of materials, inhibiting the leaching of Pb2+ ions from the reclaimed materials back into water. In addition, these materials showed good reusability and practical application. This study demonstrated the potential of these low cost phosphate nanocomposites as promising materials for successive removal of Pb2+ and CR from water.
AB - The successive removal of Pb2+ and Congo red (CR) from aqueous solution by three magnetic phosphate nanocomposites (Fe3O4@Sr5(PO4)3(OH), Fe3O4@Ba3(PO4)2, and Fe3O4@Sr5xBa3x(PO4)3(OH), denominated FSP, FBP, and FSBP, respectively) was systematically investigated in comparison with Fe3O4 (denominated F) nanoparticle. FSP, FSBP, F, and FBP exhibited a high removal capacity of 351, 272, 76, and 23 mg/g for Pb2+, respectively. These materials could be reclaimed by magnetic separation and then used for successive CR remediation, showing a high CR removal capacity of 224, 163, 126, and 61 mg/g, respectively. The isothermal and kinetic behavior fitted well with the Langmuir model and pseudo-second-order model, respectively. The successive removal mechanism by these magnetic phosphates was proposed to be the ion exchange between Pb2+ and Sr2+ in the lattice and then the loaded Pb2+ could contact with anionic dye CR to form precipitation on the surface of materials, inhibiting the leaching of Pb2+ ions from the reclaimed materials back into water. In addition, these materials showed good reusability and practical application. This study demonstrated the potential of these low cost phosphate nanocomposites as promising materials for successive removal of Pb2+ and CR from water.
KW - Dye
KW - Heavy metal
KW - Magnetic phosphate nanocomposites
KW - Successive removal
KW - Water treatment
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UR - http://www.scopus.com/inward/citedby.url?scp=85058792999&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.12.291
DO - 10.1016/j.scitotenv.2018.12.291
M3 - Article
C2 - 30677978
AN - SCOPUS:85058792999
VL - 658
SP - 1139
EP - 1149
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
ER -