摘要
Increasing applications of metal oxide nanoparticles and their release in the natural environment is a serious concern due to their toxic nature.Therefore,it is essential to have eco-friendly solutions for the remediation of toxic metal oxides in an aqueous environment.In the present study,eco-friendly Iron Oxide Nanoparticles(IONPs)are synthesized using solvothermal technique and successfully characterized using scanning and transmission electron microscopy(SEM and TEM respectively)and powder X-Ray diffraction(PXRD).These IONPs were further utilized for the remediation of toxic metal oxide nanoparticle,i.e.,Ce02.Sorption experiments were also performed in complex aqueous solutions and real water samples to check its applicability in the natural environment.Reusability study was performed to show cost-effectiveness.Results show that these 200 nm-sized spherical IONPs,as revealed by SEM and TEM analysis,were magnetite(Fe3O4)and contained short-range crystallinity as confirmed from XRD spectra.Sorption experiments show that the composite follows the pseudosecond-order kinetic model.Further k>0.99 for Langmuir sorption isotherm suggests chemisorption as probable removal mechanism with monolayer sorption of Ce02 NPs on IONP.More than 80%recovery of adsorbed Ce02 NPs through ultrasonication and magnetic separation of reaction precipitate confirms reusability of IONPs.Obtained removal%of Ce02 in various synthetic and real water samples was>90%signifying that IONPs are candidate adsorbent for the removal and recovery of toxic metal oxide nanoparticles from contaminated environmental water samples.
基金
We recognize financial support from the SERBRamanujan Fellowship grant(SB/S2/RJN-006/2016)
SERB-ECR project grant(ECR/2017/000707) from Department of Science and Technology(DST),India.We are also thankful to the Indian Institute of Science Education and Research Kolkata's central instrumentation facility for TEM,FESEM,and PXRD analysis.
