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Statements

Subject Item
n2:RIV%2F61389005%3A_____%2F05%3A00031981%21RIV06-AV0-61389005
rdf:type
n8:Vysledek skos:Concept
dcterms:description
Sorpce Cs, Co a Eu na uhlí (oxihumolitu a jeho mateřském lignitu s obsahem kyslíkatých skupin uměle zvýšeným oxidací) byla studována radiostopovací metodou. Distribuční koeficienty (Kd) rostly v pořadí Cs < Co < Eu v souladu s rostoucím nábojem kationtu kovu a jeho rostoucí schopnosti komplexace s uhelnými huminovými látkami (HS). V kyselé oblasti Kd rostly s pH díky disociaci vazebných míst HS. V neutrální oblasti Kd Eu (u oxihumolitu i Co) klesaly s pH vzhledem ke tvorbě rospustných komplexů s HS. V neutrální oblasti se sorpční účinnost uhelných sorbentů zvýšila ve směsi s chitosanem, zejména u oxihumolitu při sorpci Eu a Co. Přídavek chitosanu zabraňuje snížení sorpční schopnosti zřejmě odstraněním komplexů s HS z roztoku při tvorbě nerozpustného komplexu s chitosanem. Sorption of Cs, Co and Eu on coal (oxihumolite and its parent lignite artificially oxidized to increase degree of oxygen functionalities) in mixture with chitosan was studied using radiotracer method. Distribution coefficients (Kd) increasing in the order Cs < Co < Eu reflected increasing charge of a metal cation and its increasing ability of complexation with coal humic substances(HS). In acidic media, Kds increased with pH due to dissociation of the HS binding sites. In neutral media, Kds of Eu (for oxihumolite also Co) decreased with pH due to formation of soluble HS complexes. An improved sorption efficiency of the coal sorbents at neutral pH was obtained in mixture with chitosan, namely for oxihumolite at sorption of Eu and Co. Addition of chitosan prevents deterioration of the sorption ability probably via removing the HS complexes from solution by formation of an insoluble complex with chitosan. Sorption of Cs, Co and Eu on coal (oxihumolite and its parent lignite artificially oxidized to increase degree of oxygen functionalities) in mixture with chitosan was studied using radiotracer method. Distribution coefficients (Kd) increasing in the order Cs < Co < Eu reflected increasing charge of a metal cation and its increasing ability of complexation with coal humic substances(HS). In acidic media, Kds increased with pH due to dissociation of the HS binding sites. In neutral media, Kds of Eu (for oxihumolite also Co) decreased with pH due to formation of soluble HS complexes. An improved sorption efficiency of the coal sorbents at neutral pH was obtained in mixture with chitosan, namely for oxihumolite at sorption of Eu and Co. Addition of chitosan prevents deterioration of the sorption ability probably via removing the HS complexes from solution by formation of an insoluble complex with chitosan.
dcterms:title
Sorbenty toxických kovů a radionuklidů na bázi imobilizované huminové kyseliny a chitosanu Sorbents of Toxic Metals and Radionuclides Based on Immobilized Humic Acid and Chitosan Sorbents of Toxic Metals and Radionuclides Based on Immobilized Humic Acid and Chitosan
skos:prefLabel
Sorbents of Toxic Metals and Radionuclides Based on Immobilized Humic Acid and Chitosan Sorbenty toxických kovů a radionuklidů na bázi imobilizované huminové kyseliny a chitosanu Sorbents of Toxic Metals and Radionuclides Based on Immobilized Humic Acid and Chitosan
skos:notation
RIV/61389005:_____/05:00031981!RIV06-AV0-61389005
n3:strany
744;745
n3:aktivita
n7:P n7:Z
n3:aktivity
P(IAA3111306), Z(AV0Z10480505)
n3:dodaniDat
n5:2006
n3:domaciTvurceVysledku
n9:6266371
n3:druhVysledku
n17:D
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
543567
n3:idVysledku
RIV/61389005:_____/05:00031981
n3:jazykVysledku
n20:eng
n3:klicovaSlova
coal; humic substances; chitosan; radiotracer technique
n3:klicoveSlovo
n4:radiotracer%20technique n4:coal n4:chitosan n4:humic%20substances
n3:kontrolniKodProRIV
[9F2A05CF7C44]
n3:mistoKonaniAkce
Praha
n3:mistoVydani
Praha
n3:nazevZdroje
Proceedings of WORKSHOP 2005
n3:obor
n19:CB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:projekt
n15:IAA3111306
n3:rokUplatneniVysledku
n5:2005
n3:tvurceVysledku
Mizera, Jiří Borecká, Lenka Mizerová, Gabriela Machovič, Vladimír
n3:typAkce
n12:CST
n3:zahajeniAkce
2005-03-21+01:00
n3:zamer
n18:AV0Z10480505
s:numberOfPages
2
n16:hasPublisher
České vysoké učení technické v Praze
n21:isbn
80-01-03201-9