NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2016, 7 (3), P. 488–491
Magnetic silica nanoparticles for the removal of Pb+2 from water
N. Shukla – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India; Department of Chemistry, Institute of Excellence in Higher Education, Bhopal-462016, India
A. Saxena – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India; pramrai@rediffmail.com
V. Gupta – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India
A. S. Rawat – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India
V. Kumar – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India
S. Shrivastava – Department of Chemistry, Institute of Excellence in Higher Education, Bhopal-462016, India
C. Rajagopal – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India
P. K. Rai – Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi-110054, India; amsa888@rediffmail.com
Zero valent iron impregnated silica nanoparticles (Fe0/n-SiO2) were synthesized using sol-gel process followed by supercritical drying, wet impregnation and hydrogen reduction. The synthesized nanoparticles were characterized by nitrogen Brunauer–Emmett–Teller (N2-BET), Scanning Electron Microscopy, Transmission Electron Microscopy, Scanning Electron Microscopy with EnergyDispersive X-ray spectroscopy, Vibrating Sample Magnetometer and X-ray diffraction techniques. Prepared samples were found to be magnetic with ultra-low density (0.048 g/mL) and high surface area (422 m2/g). Prepared samples were evaluated for adsorptive removal of Pb+2 (5, 10, 25 and 50 ppm) from contaminated water. Results indicated that the adsorption of Pb+2 was faster at lower concentrations (5 and 10 ppm) as > 80 % of Pb+2 was removed within 480 minutes. At higher concentrations, the adsorption was slower, and the removal efficiency of 51.24 and 21.78 % were observed for 25 and 50 ppm Pb+2 respectively, whereas for bare SiO2 nanoparticles, it was 39.64 and 14.04 %.
Keywords: Fe0/n-SiO2, Pb+2, removal capacity, removal percentage, pH enhancement.
PACS 81.16.Be
DOI 10.17586/2220-8054-2016-7-3-488-491