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000317367 0247_ $$2doi$$a10.1016/j.molliq.2016.11.115
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000317367 1001_ $$0P:(DE-HGF)0$$aKošak, Aljoša$$b0$$eCorresponding author
000317367 245__ $$aLead (II) complexation with 3-mercaptopropyl-groups in the surface layer of silica nanoparticles: Sorption, kinetics and EXAFS/XANES study
000317367 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2017
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000317367 500__ $$a(c) Elsevier B.V. Post referee full text in progress (embargo 1 year from 2 December 2016).
000317367 520__ $$aIn this work, mono-dispersed mercapto-functionalized silica (SiO$_2$@SH) particles with a narrowparticle size distributionof around (420±10) nmwere prepared by the sol–gel method for the adsorption of aqueous dissolvedlead (Pb$^{2+}$) ions from modeled wastewater. Transmission Electron Microscopy (TEM), in combination with Energy-Dispersive X-ray Spectroscopy (EDXS), was used to obtain information about the particle size and morphologyof the prepared samples. Dispersive X-ray Spectroscopy (EDXS) indicated strong signals of Si and S, implyingsuccessful completion after the mercapto (-SH) functionalization of the silica (SiO$_{2}$) surfaces. Fourier TransformInfrared Spectroscopy (FTIR) was used to determine the occurrences of Si–O–Si and -SH vibrations within thesamples and, thus, come to a conclusion about the formations of the mercapto-functionalized samples. Analysiswas performed of Pb$^{2+}$ adsorption with mercapto-groups (-SH) on the surface of the SiO$_{2}$@SH particles. The resultsfor Pb$^{2+}$ adsorptions fromthemodeledwastewater showed affinity of around 55% and the obtained value ofthe maximum amount of adsorbed Pb$^{2+}$ ions with the SiO$_{2}$@SH samples was 10.82 mg/g under the conditionsused during this study. The results of the adsorptions were fitted with the Langmuir and Freundlich isothermmodels and the pseudo-first and pseudo-second kinetic models were evaluated. We employed Pb-L3 edge Xrayabsorption spectroscopy techniques XANES (X-ray Absorption Near Edge Structure) and EXAFS (ExtendedX-ray Absorption Fine Structure) for probing the local environments of Pb within the tentative Pb-S complexafter adsorptions of Pb$^{2+}$ by the mercapto groups. The EXAFS/XANES analysis indicated complete Pb$^{2+}$ complexationwith two -SH groups of the prepared SiO$_{2}$@SH samples.
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000317367 7001_ $$aBauman, Maja$$b1
000317367 7001_ $$0P:(DE-H253)PIP1008431$$aPadeznik Gomilsek, Jana$$b2
000317367 7001_ $$aLobnik, Aleksandra$$b3
000317367 773__ $$0PERI:(DE-600)1491496-7$$a10.1016/j.molliq.2016.11.115$$gVol. 229, p. 371 - 379$$p371 - 379$$tJournal of molecular liquids$$v229$$x0167-7322$$y2017
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