01569nas a2200229   4500008004100000022001400041245011900055210006900174260007300243300001200316490000800328520071000336653001401046653001301060653002301073653001301096653002801109100002801137700001601165700002701181856013101208       2014                        eng d  a0304-389400aDefluoridation using biomimetically synthesized nano zirconium chitosan composite: kinetic and equilibrium studies0 aDefluoridation using biomimetically synthesized nano zirconium c  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a232-2400 v2763 a<p>{The present study reports a novel approach for synthesis of Zr nanoparticles using aqueous extract of Aloe vera. Resulting nanoparticles were embedded into chitosan biopolymer and termed as CNZr composite. The composite was subjected to detailed adsorption studies for removal of fluoride from aqueous solution. The synthesized Zr nanoparticles showed UV-vis absorption peak at 420 nm. TEM result showed the formation of polydispersed, nanoparticles ranging from 18 nm to 42 nm. SAED and XRD analysis suggested an fcc (face centered cubic) Zr crystallites. EDAX analysis suggested that Zr was an integral component of synthesized nanoparticles. FT-IR study indicated that functional group like -NH</p>10aAloe vera10aChitosan10aFT-IR spectroscopy10aSorption10aZirconium nanoparticles1 aPrasad, Kumar, Suranjit1 aAmin, Yesha1 aSelvaraj, Kaliaperumal  uhttps://library.ncl.res.in/content/defluoridation-using-biomimetically-synthesized-nano-zirconium-chitosan-composite-kinetic-002361nas a2200265   4500008004100000022001400041245013200055210006900187260000900256300001200265490000700277520148200284653001501766653001301781653000901794653001301803653000801816100002501824700001801849700002601867700002701893700001801920700002801938856012901966       2020                        eng d  a1060-132500aRemoval of fluoride from aqueous solution by mesoporous silica nanoparticles functionalized with chitosan derived from mushroom0 aRemoval of fluoride from aqueous solution by mesoporous silica n  cSEP   a619-6270 v573 a<p>In the present study, chitosan functionalized mesoporous silica nanoparticles have been synthesized. Chitosan derived from an edible mushroom, Agaricus bisporus was used during synthesis of chitosan functionalized silica nanoparticles. The functionalized silica nanoparticles were subjected to fluoride sorption using a batch method which subsequently showed removal efficiency of 95% with maximum sorption capacity, 58.8 mg/g. The characterization of nanoparticles was carried out by SEM, EDAX, XRD and FTIR analysis respectively. EDAX analysis suggested that oxygen, 51.83% and silica 37.24% was main constituent of the functionalized nanomaterials. XRD yielded characteristic diffraction pattern corresponding to the lattice planes (100), (110), (112), (120), (200) and (220) respectively. Sorption data was used to study equilibrium isotherm namely Langmuir and Freundlich model. The adsorption capacity increased with temperature while kinetics studies revealed that the adsorption process followed a pseudo-second-order rate equation. The enthalpy change (Delta H) and entropy change (Delta S) was found to be -31.36 kJmol(-1) and -7.75 Jmol(-1) K-1, showing endothermic and spontaneous nature of the fluoride adsorption. Data suggested that the nature of adsorption belonged to chemisorptions. The overall results suggested that the synthesized nanoparticles showed strong and specific affinity for fluoride and could be excellent adsorbents for defluoridation.</p>
10aAdsorption10aChitosan10aEDAX10aFluoride10aSEM1 aSrivastava, Anushree1 aKumari, Madhu1 aRamanathan, Alagappan1 aSelvaraj, Kaliaperumal1 aPrasad, Bablu1 aPrasad, Kumar, Suranjit  uhttps://library.ncl.res.in/content/removal-fluoride-aqueous-solution-mesoporous-silica-nanoparticles-functionalized-chitosan