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CaAl-monosulfate와 CaAl-ettringite를 이용한 인공비소폐수의 비소 제거 연구

Title
CaAl-monosulfate와 CaAl-ettringite를 이용한 인공비소폐수의 비소 제거 연구
Author
박주양
Keywords
비소제거; 층상이중수산화물; 모노설페이트; 에트린자이트; arsenate removal; layered double hydroxides; monosulfate; ettringite
Issue Date
2012-02
Publisher
대한상하수도학회
Citation
상하수도학회지, 2012, 26(1), P.141-148
Abstract
시멘트를 이용한 고형화/안정화의 여러 기작 중 시멘트 페이스트의 구성물인 monosulfate와 ettringite에 초점을 맞춰 이들을 각 각 합성하고 인공비소폐수에서의 비소 제거 실험을 실시했다. 소성과 중탕 과정을 거쳐 Ca2+와 Al3+이 mainlayer를 이루고 있으며, SO42-가 interlayer에 삽입되어 있는 CaAl-monosulfate와 Ca2+와 Al3+가 column형태의 구조로, SO42-가 channel형태로 구성되어 있는 CaAl-ettringite를 합성했다. 순수하게 합성된 시료로 1.335mmol/L As(Ⅴ) 농도의 수용액을 각각 0.054 mmol/L As(Ⅴ)와 0.300mmol/L As(Ⅴ)까지 감소시켰다. PXRD와 FESEM을 이용하여 반응 전 후의 시료 결정 구조와 상 분석을 행함으로써 이온교환에 의해 인공비소폐수의 비소가 제거 된 것을 알 수 있었다.The objective of this study is to remove arsenate from artificially contaminated wastewater using CaAl-ettringite and CaAl-monosulfate which were synthesized in laboratory. The study was carried on the basis of solidification/stabilization of waste using cement. Monosulfate and ettringite are constituents of cement paste. The CaAl-ettringite has a chemical formula of Ca6Al2O6 (SO4)3 32H2O and has a needle like morphology. Whereas CaAl-monosulfate Ca4Al2O6 (SO4) 12H2O has layered double hydroxide structure (LDH) in which the mainlayer consists of Ca and Al and S as interlayer. Ettringite and monosulfate were synthesized by reaction of tricalcium aluminate and gypsum and hydrating this mixture at elevated temperature, The synthesized mineral were characterized by PXRD and FESEM to ensure purity, It was found that concentrations of As (V) in contaminated water were reduced from initial concentration of 1.335mmol/L to 0.054mmol/L and 0.300mmol/L by CaAl-monosulfate and CaAl-ettringite respectively. The post experimental results of PXRD and FESEM analysis indicate that arsenate removal was by ion exchange.
URI
http://kiss.kstudy.com/thesis/thesis-view.asp?key=3077318
ISSN
1225-7672
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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