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231225s2019 xx |||||o 00| ||eng c |
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|a 10.2166/wst.2019.209
|2 doi
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|a pubmed24n0997.xml
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|a (DE-627)NLM299308758
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|a (NLM)31318349
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Tian, Quanzhi
|e verfasserin
|4 aut
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|a Application of fly ash-based geopolymer for removal of cesium, strontium and arsenate from aqueous solutions
|b kinetic, equilibrium and mechanism analysis
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 05.09.2019
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|a Date Revised 15.12.2020
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|a published: Print
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|a Citation Status MEDLINE
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|a Geopolymerization is a developing reaction process for the utilization of solid wastes. In the present study, fly ash-based geopolymer and its derivative (Fe(II)-modified geopolymer) were synthesized and characterized using XRD, SEM, FTIR, BET, UV-Vis DRS as well as TG-DTA, and adopted as adsorbents for removal of Cs+ and Sr2+, and AsO3-4 from solutions. Each sorption kinetic was well fitted to the pseudo-second-order model. The sorption of Cs+ and Sr2+ onto original geopolymer were better fitted to the Langmuir model. However, the Freundlich model is more befitting for sorption of AsO3-4 onto Fe(II)-modified geopolymer. The free energies calculated from the D-R isotherm indicated that the sorption for Cs+ and Sr2+ were dominantly ion exchanges. Ring size plays a decisive role in ion exchanges for both Cs+ and Sr2+. Furthermore, the arrangement of SiO4 and AlO4 tetrahedrons has significant impacts on the ion exchange of Sr2+. XPS results indicated that a part of Fe2+ in Fe (II)-modified geopolymer had been oxidized to Fe3+ after sorption. Precipitation of FeAsO4 could partially contribute to the arsenate removal from solution. AsO3-4sorption has also occurred through the formation of inner-sphere complexes via ion exchange reaction, which could be predominantly attached by bidentate linkages
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|a Journal Article
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|a Arsenates
|2 NLM
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|a Coal Ash
|2 NLM
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|a Solutions
|2 NLM
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|a Water Pollutants, Chemical
|2 NLM
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|a Cesium
|2 NLM
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| 650 |
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|a 1KSV9V4Y4I
|2 NLM
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|a Strontium
|2 NLM
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| 650 |
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|a YZS2RPE8LE
|2 NLM
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| 700 |
1 |
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|a Sasaki, Keiko
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Water science and technology : a journal of the International Association on Water Pollution Research
|d 1986
|g 79(2019), 11 vom: 29. Juni, Seite 2116-2125
|w (DE-627)NLM098149431
|x 0273-1223
|7 nnns
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| 773 |
1 |
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|g volume:79
|g year:2019
|g number:11
|g day:29
|g month:06
|g pages:2116-2125
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|u http://dx.doi.org/10.2166/wst.2019.209
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