title: Zero valent metal loaded silica nanoparticles for the removal of TNT from water.
abstract: 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.
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: Harsha
authors.initials: H
authors.lastname: Mangal
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: Amit
authors.initials: A
authors.lastname: Saxena
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: Nivedita
authors.initials: N
authors.lastname: Shukla
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: P K
authors.initials: PK
authors.lastname: Rai
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: A S
authors.initials: AS
authors.lastname: Rawat
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: Vivek
authors.initials: V
authors.lastname: Kumar
authors.affiliation: Center for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India E-mail: pramrai@rediffmail.com.
authors.forename: Vatsana
authors.initials: V
authors.lastname: Gupta
authors.affiliation: Department of Chemistry, University of Delhi, Delhi 110006, India.
authors.forename: Monika
authors.initials: M
authors.lastname: Datta
mesh_terms: D000327:Adsorption; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014303:Trinitrotoluene / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D014303:Trinitrotoluene; D012822:Silicon Dioxide