Manpreet KaurJaskiran Kaur2018-05-272018-05-272017http://krishikosh.egranth.ac.in/handle/1/5810047766Adsorptive properties of synthesized magnetite activated carbon nanocomposites are investigated for the facile removal of Cr (VI) ions from water. Fe3O4 NPs and its nanocomposites with activated carbon were characterized by X-ray diffractiion pattern (XRD), FT-IR spectroscopy, Vibrating sample magnetometer (VSM), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) and Brunauer Emmet Teller (BET) surface area analysis as analytical tools. TEM images revealed the agglomerated spherical morphology of Fe3O4NPs and nanocomposites. A comparative analysis of the Fe3O4 NPs, nanocomposites and activated carbon for the removal of Cr (VI) ions from water was carried out by batch method and Cr (VI) content was estimated spectrophotometrically. The effect of operating parameters including adsorbent dose, temperature, contact time, pH and initial metal ion concentration of Cr (VI) were studied. Optimum pH for adsorption was 2. Values of ∆Go, ∆H˚ and ∆S˚ were found to be negative for all adsorbents, indicating exothermic and spontaneous nature of adsorption process The trend for the Cr (VI) ions percentage removal in the ascending order was Fe3O4 NPs<nanocomposites <activated carbon. Among the nanocomposites, The Cr (VI) removal capacity increased with increase in activated carbon content. Langmuir and Freundlich isotherms fitted the data better than D-R isotherms. The advantage of nanocomposites is enhancement of adsorption potential due to presence of Fe3O4 NPs along with activated carbon and their magnetic separation after adsorptionennullThesis