Silica nanoparticles with a surface area of 673.60 m2/g and particle size of 8–12 nm were prepared using aerogel process (AP) followed by super critical drying. Zero valent Fe, Co, Pt, and bimetallic Fe/Pt and Fe/Co were loaded using an incipient wetness impregnation technique and subsequent reduction. Scanning electron microscopy-energy dispersive X-ray (SEM-EDX) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) characterizations indicated fine dispersion of iron on AP-SiO2 +Fe system. Prepared nanoparticles were evaluated for the adsorptive removal of 2,4,6-trinitrotoluene (TNT) from water. Surface area normalized rate constant values indicated the adsorptive removal potential of prepared nanoparticles to be: AP-SiO2 + Fe/Co > AP-SiO2 + Fe > CM (commercial) SiO2 + Fe > AP-SiO2 + Co > AP-SiO2 + Fe/Pt > AP-SiO2 + Pt. Lower pH helped in accelerating the reactive removal of TNT on zero valent iron loaded silica. AP-SiO2 + Fe/Co system showed the maximum adsorption potential (74 mg/g) after five cycles.
Zero valent metal loaded silica nanoparticles for the removal of TNT from water
Harsha Mangal, Amit Saxena, Nivedita Shukla, P. K. Rai, A. S. Rawat, Vivek Kumar, Vatsana Gupta, Monika Datta; Zero valent metal loaded silica nanoparticles for the removal of TNT from water. Water Sci Technol 13 February 2017; 75 (3): 716–726. doi: https://doi.org/10.2166/wst.2016.478
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