02204nas a2200301   4500008004100000022001400041245011000055210006900165260007900234300001400313490000800327520115400335653001401489653000901503653002201512653002701534653000801561653002401569100002801593700002601621700002201647700001801669700001901687700001801706700002101724700002701745856013001772       2015                        eng d  a0273-228900aMicrobial selenium nanoparticles (SeNPs) and their application as a sensitive hydrogen peroxide biosensor0 aMicrobial selenium nanoparticles SeNPs and their application as   a999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USAbHUMANA PRESS INCcNOV  a1386-13930 v1773 a<p>The cell-free extract, a crude enzyme (cytosolic and membrane fraction) obtained from an environmental isolate, Bacillus pumilus sp. BAB-3706 worked as excellent in reducing as well as stabilizing agent and facilitated the formation of stable colloidal selenium nanoparticles (SeNPs). Resulting nanoparticles were characterized using UV-vis spectrophotometer, TEM, EDAX, FT-IR and XRD, respectively. A working electrode was modified by coating the surface of indium tin oxide (ITO) with colloidal SeNPs. Successive additions of H2O2 (100 to 600 mu M) in conventional three electrodes system, cyclic voltammeter with potential scan rate 25.0 mV/s, in 0.1 M phosphate buffer solution (PBS) yielded increase in current. A perpetual amperometric response at fixed potential (-1.0 V) and at selected time interval of 100 s showed different magnitude of current at every addition of H2O2. The linear range of detection of H2O2 was from 5 to 600 mM (R (2) = 0.9965), while the calculated limit of detection was found to be 3.00 mu M. The current study suggested that microbial SeNPs can be used for fabrication of low cost, sensitive H2O2 biosensor.</p>10aBiosensor10aEDAX10aHydrogen peroxide10aSelenium nanoparticles10aTEM10aUV-vis spectroscopy1 aPrasad, Kumar, Suranjit1 aVaghasiya, Jayraj, V.1 aSoni, Saurabh, S.1 aPatel, Jitesh1 aPatel, Rinkesh1 aKumari, Madhu1 aJasmani, Falguni1 aSelvaraj, Kaliaperumal  uhttps://library.ncl.res.in/content/microbial-selenium-nanoparticles-senps-and-their-application-sensitive-hydrogen-peroxide-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