Browsing by Author "Filip Jan"
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- ItemActivation process of air stable nanoscale zero-valent iron particles(ELSEVIER SCIENCE SA, 2017-01-01) Černík Miroslav; Ribas David; Benito Jóse; Filip Jan; Marti VicensNanoscale Zero Valent Iron (nZVI) represents a promising material for subsurface water remediation technology. However, dry, bare nZVI particles are highly reactive, being pyrophoric when they are in contact with air. The current trends of nZVI manufacturing lead to the surface passivation of dry nZVI particles with a thin oxide layer, which entails a decrease in their reactivity. In this work an activation procedure to recover the reactivity of air-stable nZVI particles is presented. The method consists of exposing nZVI to water for 36 h just before the reaction with the pollutants. To assess the increase in nZVI reactivity based on the activation procedure, three types of nZVI particles with different oxide shell thicknesses have been tested for Cr(VI) removal. The two types of air-stable nZVI particles with an oxide shell thickness of around 3.4 and 6.5 nm increased their reactivity by a factor of 4.7 and 3.4 after activation, respectively. However, the pyrophoric nZVI particles displayed no significant improvement in reactivity. The improvement in reactivity is related mainly to the degradation of the oxide shell, which enhances electron transfer and leads secondarily to an increase in the specific surface area of the nZVI after the activation process. In order to validate the activation process, additional tests with selected chlorinated compounds demonstrated an increase in the degradation rate by activated nZVI particles.
- ItemAnaerobic Reaction of Nanoscale Zerovalent Iron with Water: Mechanism and Kinetics(AMER CHEMICAL SOC, 2014-01-01) Černík Miroslav; Zbořil Radek; Marušák Zdeněk; Otyepka Michal; Karlický František; Filip Jan; Lazar Petr
- ItemAntimicrobial modifications of ultrafiltration membranes with different precursors for silver nanoparticles(2015-01-01) Dolina Jan; Dvořák Lukáš; Lederer Tomáš; Soukupova Jana; Filip Jan
- ItemApplication of nanoscale zero valent iron (NZVI) for groundwater remediation in Europe(Pergamon Press Ltd., 2011-01-01) Klímková Štěpánka; Černík Miroslav; Lacinová Lenka; Filip Jan; Zbořil Radek
- ItemCe2S3 decorated ZnO-ZnS core-shell nanorod arrays: Efficient solar-driven photocatalytic properties(Elsevier, 2016-01-01) K. S Ranjith; Saravanan P.; Vellora Thekkae Padil Vinod; Filip Jan; Černík Miroslav; R. T Rajendra Kumar
- ItemCombination of nanoscale-zero-valent iron and organic sub-strate stimulation for efficient remediation of co-mingled plume contaminated with Cr(VI) and chlorinated solvents(2016-01-01) Cajthaml Tomáš; Němeček Jan; Pokorný Petr; Lhotský Ondřej; Knytl Vladislav; Najmanová Petra; Steinová Jana; Černík Miroslav; Filipová Alena; Filip Jan
- ItemCombined nano-biotechnology for in-situ remediation of mixed contamination of groundwater by hexavalent chromium and chlorinated solvents(ELSEVIER SCIENCE BV, 2016-01-01) Němeček Jan; Pokorný Petr; Lhotský Ondřej; Knytl Vladislav; Najmanová Petra; Steinová Jana; Černík Miroslav; Filipová Alena; Filip Jan; Cajthaml Tomáš
- ItemDiscovering the potential of an nZVI-biochar composite as a material for the nanobioremediation of chlorinated solvents in groundwater: Degradation efficiency and effect on resident microorganisms(Elsevier, 2021-01-01) Semerád Jaroslav; Ševců Alena; Nguyen Nhung Anh Huynh; Hrabák Pavel; Špánek Roman; Bobčíková Kateřina; Pospíšková Kristýna; Filip Jan; Medřík Ivo; Kašlík Josef; Šafařík Ivo; Filipová Alena; Nosek Jaroslav; Pivokonský Martin; Cajthaml Tomáš
- ItemElectrospun membrane composed of poly [acrylonitrile-co-(methyl acrylate)-co-(itaconic acid)] terpolymer and ZVI nanoparticles and its application for the removal of arsenic from water(2016-01-01) Vellora Thekkae Padil Vinod; Filip Jan; Suresh Kattimuttathu I.; Waclawek Stanislaw; Černík Miroslav
- ItemHighly concentrated, reactive and stable dispersion of zero-valent iron nanoparticles: Direct surface modification and site application(ELSEVIER SCIENCE SA, PO BOX 564, 1001, 2015-01-01) Černík Miroslav; Nosek Jaroslav; Zbořil Radek; Filip Jan
- ItemMicroscopic size iron influence study on its reactivity with chlorinated ethenyl(2011-01-01) Lacinová Lenka; Sodomková Martina; Filip Jan
- ItemModification of nZVI with a bio-conjugate containing amine and carbonyl functional groups for catalytic activation of persulfate(Elsevier, 2021-01-01) Silvestri Daniele; Waclawek Stanislaw Witold; Sobel Bartłomiej; Torres Mendieta Rafael Omar; Pawlyta Mirosława; Vellora Thekkae Padil Vinod; Filip Jan; Černík Miroslav
- ItemOxidic Shield And Its Influence on the Reactivity And Migration of Air-stable Iron Nanoparticles(Tanger, spol. s.r.o., 2015, 2015-01-01) Pešková Kristýna; Černík Miroslav; Parma Petr; Lacinová Lenka; Filip Jan; Zbořil Radek; Ribas David; Benito Jóse; Marti Vicens
- ItemZero-valent iron particles for PCB degradation and an evaluation of their effects on bacteria, plants, and soil organisms(Springer, 2017-01-01) Ševců Alena; El-Temsah Yehia Sayed Ismail; Filip Jan; Joner Erik; Bobčíková Kateřina; Černík Miroslav