Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites
The saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H+ to Li+, Na+, K+, Rb+ and Cs+-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was...
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| Format: | Article |
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MDPI AG
2015-03-01
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| Series: | Environments |
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| Online Access: | http://www.mdpi.com/2076-3298/2/1/91 |
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| author | Moses Wazingwa Munthali Erni Johan Naoto Matsue |
| author_facet | Moses Wazingwa Munthali Erni Johan Naoto Matsue |
| author_sort | Moses Wazingwa Munthali |
| collection | DOAJ |
| description | The saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H+ to Li+, Na+, K+, Rb+ and Cs+-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was evaluated at different pH-pM, where pH-pM is equal to log {(M+)/(H+)} and M+ represents either Li+, Na+, K+, Rb+, or Cs+. In all cases, with decreasing pH-pM, the amounts of alkali metal retention decreased due to the adsorption of H+ via cation exchange reaction. The adsorption selectivity of H+ into the zeolites had a negative correlation with the Si/Al ratio of the zeolites. In each zeolite species, Cs+-saturated zeolite showed the lowest H+ selectivity, and this suggested that Cs+ had the strongest adsorption energy in the alkali metal cations. The adsorption of H+ was strongly affected by diameter and hydration energy of the alkali metal cations, and was also affected by the framework type and Si/Al ratio of the zeolites. The adsorption of H+ into zeolites decreases the amount of cation retention other than with H+ and may cause the elution of Si and Al into aqueous solutions. |
| first_indexed | 2024-04-11T12:07:41Z |
| format | Article |
| id | doaj.art-88551134986b40a7952fb6ba2bc9bcbb |
| institution | Directory Open Access Journal |
| issn | 2076-3298 |
| language | English |
| last_indexed | 2024-04-11T12:07:41Z |
| publishDate | 2015-03-01 |
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| series | Environments |
| spelling | doaj.art-88551134986b40a7952fb6ba2bc9bcbb2022-12-22T04:24:41ZengMDPI AGEnvironments2076-32982015-03-01219110410.3390/environments2010091environments2010091Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of ZeolitesMoses Wazingwa Munthali0Erni Johan1Naoto Matsue2Department of Life Environmental Conservation, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanDepartment of Life Environmental Conservation, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanDepartment of Life Environmental Conservation, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, JapanThe saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H+ to Li+, Na+, K+, Rb+ and Cs+-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was evaluated at different pH-pM, where pH-pM is equal to log {(M+)/(H+)} and M+ represents either Li+, Na+, K+, Rb+, or Cs+. In all cases, with decreasing pH-pM, the amounts of alkali metal retention decreased due to the adsorption of H+ via cation exchange reaction. The adsorption selectivity of H+ into the zeolites had a negative correlation with the Si/Al ratio of the zeolites. In each zeolite species, Cs+-saturated zeolite showed the lowest H+ selectivity, and this suggested that Cs+ had the strongest adsorption energy in the alkali metal cations. The adsorption of H+ was strongly affected by diameter and hydration energy of the alkali metal cations, and was also affected by the framework type and Si/Al ratio of the zeolites. The adsorption of H+ into zeolites decreases the amount of cation retention other than with H+ and may cause the elution of Si and Al into aqueous solutions.http://www.mdpi.com/2076-3298/2/1/91proton adsorption selectivityzeolitealkali metal cationSi/Al ratio |
| spellingShingle | Moses Wazingwa Munthali Erni Johan Naoto Matsue Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites Environments proton adsorption selectivity zeolite alkali metal cation Si/Al ratio |
| title | Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites |
| title_full | Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites |
| title_fullStr | Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites |
| title_full_unstemmed | Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites |
| title_short | Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites |
| title_sort | proton adsorption selectivity of zeolites in aqueous media effect of exchangeable cation species of zeolites |
| topic | proton adsorption selectivity zeolite alkali metal cation Si/Al ratio |
| url | http://www.mdpi.com/2076-3298/2/1/91 |
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