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09월 08일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Controlled-release Permanganate by Using Alginate Beads for the Effective Removal of Trichloroethylene and Its Application in Groundwater Remediation
2015년 9월 3일 09시 36분 30초
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10월 15일 (목요일) 11:00~12:30
포항공과대학교(POSTECH) 환경공학부, Korea
Due to the relative insolubility of permanganate in trichloroethylene (TCE) contaminated zone and competitive pollutants in natural aqueous solutions, in order to completely remove TCE, an excessive amount of permanganate has to be used leading to the problems of a secondary pollutant (MnO
) which is needed to be eliminated by filtering and the possible unpleasant color of water after remediation process. In this study, permanganate was effectively encapsulated in alginate beads with well-controlled releasing efficiency. Different ratios in weight between sodium alginate and permanganate were investigated, and the releasing experiments were also conducted in different pH conditions and different concentration of cross-linking cation. In TCE degradation experiments, the complete removal of TCE 15 mg/L was achieved after only 4 hours which was more effectively than using the same amount of free permanganate. Interestingly, approximately 20% of TCE can be adsorbed by using alginate beads only. The SEM images showed that alginate beads were well formed with the concentric layer-by-layer structure. When being immersed in aqueous solution, MnO
distributed at the interfacial layers of the beads was firstly released into environment creating pores which could be the pathway facilitating either the further transportation of inside MnO
or the intrusion of TCE from outside into the beads. Moreover, it was observed that no MnO
remained in solution which might be adsorbed onto the beads, and water with perfect transparent property was collected after experiment. For all these reasons, permanganate releasing alginate beads can be considered as a potential technique for
remediation of groundwater.
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