Geodesic
Magnetic silica nanoparticles for the removal of $\mathrm{Pb}^{+2}$ from water
Nanosistemy: fizika, himiâ, matematika, Tome 7 (2016) no. 3, pp. 488-491.

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Zero valent iron impregnated silica nanoparticles ($\mathrm{Fe}^0/n$-$\mathrm{SiO}_2$) 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 ($\mathrm{N}_2$-BET), Scanning Electron Microscopy, Transmission Electron Microscopy, Scanning Electron Microscopy with Energy-Dispersive 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 ($422$ m$^2$/g). Prepared samples were evaluated for adsorptive removal of $\mathrm{Pb}^{+2}$ ($5$, $10$, $25$ and $50$ ppm) from contaminated water. Results indicated that the adsorption of $\mathrm{Pb}^{+2}$ was faster at lower concentrations ($5$ and $10$ ppm) as $>80$ % of $\mathrm{Pb}^{+2}$ 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 $\mathrm{Pb}^{+2}$ respectively, whereas for bare $\mathrm{SiO}_2$ nanoparticles, it was $39.64$ and $14.04$ %.
Keywords: $\mathrm{Fe}^0/n$-$\mathrm{SiO}_2$, $\mathrm{Pb}^{+2}$, removal capacity, removal percentage, pH enhancement. 
@article{NANO_2016_7_3_a12,
     author = {N. Shukla and A. Saxena and V. Gupta and A. S. Rawat and V. Kumar and S. Shrivastava and C. Rajagopal and P. K. Rai},
     title = {Magnetic silica nanoparticles for the removal of $\mathrm{Pb}^{+2}$ from water},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {488--491},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2016_7_3_a12/}
}
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N. Shukla; A. Saxena; V. Gupta; A. S. Rawat; V. Kumar; S. Shrivastava; C. Rajagopal; P. K. Rai. Magnetic silica nanoparticles for the removal of $\mathrm{Pb}^{+2}$ from water. Nanosistemy: fizika, himiâ, matematika, Tome 7 (2016) no. 3, pp. 488-491. http://geodesic.mathdoc.fr/item/NANO_2016_7_3_a12/