DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Diallo, Mamadou Samba | - |
dc.contributor.advisor | 디알로 마마도우 삼바 | - |
dc.contributor.author | Chen, Dennis | - |
dc.contributor.author | Chen, Dennis | - |
dc.date.accessioned | 2015-04-29 | - |
dc.date.available | 2015-04-29 | - |
dc.date.issued | 2012 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=567294&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/198058 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : EEWS대학원, 2012.8, [ viii, 80 p. ] | - |
dc.description.abstract | Perchlorate (ClO4-) is a persistent contaminant found in surface and groundwater around the United States. ClO4- can have adverse health effects due to its ability to disrupt the thy-roid’s ability to produce hormones required for proper growth and development. Although the United States Environmental Agency (USEPA) has yet to formally regulate ClO4-, vari-ous states have set public health goals (PHG) for drinking water. For example, Massachu-setts and California have established PHG based on a maximum concentration of ClO4- in drinking water of 2 ppb and 6 ppb, respectively.1, 2 ClO4--selective ion exchange resins based on styrene divinylbenzene beads are currently the most commonly utilized media for removing low concentrations of ClO4- (10-50 ppb) from contaminated drinking water sources.3 However, owing to the low exchange capacity of these commercial resins, the overall treatment cost becomes prohibitive as the concentration of ClO4- in the influent wa-ter increases. In this text, we show that hyperbranched polyethylenimine (PEI) can be used as building blocks to prepare a new generation of ClO4--selective anion-exchange resins with high capacity. PEI based ion-exchange matrix prepared at AquaNano Technologies (Monrovia, California) were alkylated to afford resins with fixed ionogenic sites which were appropriately tuned to impart ClO4--selectivity. PEI resins that were functionalized with hexyl and ethyl alkyl chains (QPEI-8) can selectively extract trace amounts of ClO4- from a makeup groundwater to below detection limits (2 ppb) in the presence of competing ions. The performance of QPEI-8 was evaluated and compared with commercially available ClO4--selective A-530E resin. Batch and column studies of ClO4- removal from a simulated groundwater indicate that our new resins outperform several commercial resins. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | perchlorate | - |
dc.subject | polyethylenimine | - |
dc.subject | crosslinked polymer | - |
dc.subject | 이온 교환 | - |
dc.subject | ion-exchange | - |
dc.subject | 과염소산염 | - |
dc.subject | 폴리에틸렌이민 | - |
dc.title | Perchlorate-selective and high capacity ion-exchange resins from hyperbranched polyethylenimine | - |
dc.title.alternative | Hyperbranched폴리에틸렌이민을 이용한 선택적 과염소산염 흡착 대용량 이온 교환 수지 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 567294/325007 | - |
dc.description.department | 한국과학기술원 : EEWS대학원, | - |
dc.identifier.uid | 020104487 | - |
dc.contributor.localauthor | Diallo, Mamadou Samba | - |
dc.contributor.localauthor | 디알로 마마도우 삼바 | - |
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