Design of new adsorbents using elemental sulfur and NaX Zeolite for selective removal of radioactive cesium = 방사성 세슘의 선택적 제거를 위한 원소 황과 제올라이트를 이용한 새로운 흡착제 개발에 관한 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 182
  • Download : 0
To eliminate the radioactive cesium, $^{137}Cs^+$, various inorganic adsorbents have been investigated extensively. However, most of highly selective adsorbents are either too expensive or difficult to scale up because they are only focused on the additional interaction between $^{137}Cs^+$ and adsorbents. Although the conventional zeolites are economic and commercially available, they have critical drawback which is low selectivity under competitive conditions ($Na^+, K^+, Mg^{2+}, and Ca^{2+}$). Therefore, in this work, to develop low cost and highly selective adsorbent, we used a commercial NaX zeolite and elemental sulfur. We sublimated the elemental sulfur into the NaX zeolite and it increases the adsorption selectivity to $Cs^+$. Cs XPS analysis shows that the sulfur donates its lone pair of electrons to ion-exchanged $Cs^+$. The enhanced $Cs^+$ selectivity can be explained by HSAB (Hard Soft Acid Base) theory so that sulfur, one of the soft base, interacts more actively with $Cs^+$, relatively soft acid, than other alkali and alkaline earth metals ($Na^+, K^+, Mg^{2+}, and Ca^{2+}$).
Advisors
Choi, Minkeeresearcher최민기researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2018.2,[iii, 29 p. :]

Keywords

zeolite▼asulfur▼acesium▼aHSAB(Hard Soft Acid Base) theory▼aion-exchange; 제올라이트▼a황▼a세슘▼a굳은 무른 산 염기 이론▼a이온 교환

URI
http://hdl.handle.net/10203/266395
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=867943&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0