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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1080/09593330.2018.1511754
|2 doi
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|a pubmed25n0957.xml
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|a (DE-627)NLM287410994
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|a (NLM)30102121
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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 Barragán-Peña, P
|e verfasserin
|4 aut
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|a Fixed-bed column system for Cd2+ uptake from aqueous solution by sodium- and thiourea-modified clinoptilolite-rich tuff
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|c 2020
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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
|b cr
|2 rdacarrier
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|a Date Completed 20.02.2020
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|a Date Revised 20.02.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Two kinds of clinoptilolite-rich tuffs from the state of Sonora (Mexico), previously treated with NaCl solution and then modified with thiourea, were investigated to remove Cd2+ from aqueous solution in a fixed-bed column system. Experiments were conducted with a 30 mg L-1 Cd2+ solution at a pH value of 5 and three-bed heights of sodium- and thiourea-modified clinoptilolite-rich tuffs. The experimental data were examined with the bed depth service time model (BDST), the Thomas model, and a mass balance approach. According to the BDST model, the dynamic sorption capacity (No) for the thiourea-modified clinoptilolite-rich tuff was 0.0357 Kg L-1. This value corresponded to 1.2 times higher than that for sodium-modified clinoptilolite-rich tuff (0.0287 Kg L-1). The experimental data obtained for sodium- modified clinoptilolite-rich tuff (ZSGNa) with 3 cm of bed height, fitted to the Thomas model, with R2 = 0.9679 and Cd sorption capacity of 35.4 mg g-1, while for the thiourea-modified clinoptilolite-rich tuff (ZSGThio) with 4.5 cm of bed height, was 36.52 mg g-1 with R2 = 0.9368. The parameters calculated with the mass balance model describe a favourable process where the system with ZSGThio (6 cm bed height) had the best performance for sorption capacity up to the breakthrough point, qb = 22.35 mg g-1. The zeolite modified with thiourea exhibited higher capacity in Cd2+ removal than the one modified with NaCl, in the column with 6 cm of bed height. To investigate the mechanisms of removal of Cd2+ by the modified zeolites, Na⁺ was measured to determine the milliequivalents of cadmium removed
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|a Journal Article
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4 |
|a Cadmium
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4 |
|a bed-depth-service-time
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4 |
|a dynamic-system
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4 |
|a thiourea
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4 |
|a zeolites
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|a Water Pollutants, Chemical
|2 NLM
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7 |
|a Cadmium
|2 NLM
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| 650 |
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7 |
|a 00BH33GNGH
|2 NLM
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| 650 |
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7 |
|a clinoptilolite
|2 NLM
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| 650 |
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7 |
|a 12173-10-3
|2 NLM
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| 650 |
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7 |
|a Zeolites
|2 NLM
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| 650 |
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7 |
|a 1318-02-1
|2 NLM
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| 650 |
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7 |
|a Sodium
|2 NLM
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| 650 |
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7 |
|a 9NEZ333N27
|2 NLM
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| 650 |
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7 |
|a Thiourea
|2 NLM
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| 650 |
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7 |
|a GYV9AM2QAG
|2 NLM
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| 700 |
1 |
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|a Macedo-Miranda, M G
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Olguín, M T
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Environmental technology
|d 1993
|g 41(2020), 7 vom: 13. März, Seite 832-841
|w (DE-627)NLM098202545
|x 1479-487X
|7 nnns
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| 773 |
1 |
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|g volume:41
|g year:2020
|g number:7
|g day:13
|g month:03
|g pages:832-841
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|u http://dx.doi.org/10.1080/09593330.2018.1511754
|3 Volltext
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|a AR
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|d 41
|j 2020
|e 7
|b 13
|c 03
|h 832-841
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