Catalytic remediation of toxic oxyanions ($ClO_4^{-}$, $NO_3^{-}$) from Water = 물 속에 녹아있는 독성 음이온들의 제거를 위한 촉매적 처리방법 연구

As the growing concern about contamination of ground water and industrial wastewater, a number of inor-ganic oxyanion contaminants such as perchlorate ($ClO_4^{-}$) and nitrate ($NO_3^{-}$) become also severely issued due to the toxic effect on human even at low level concentrations. In order to remove these anions from contam-inated water, various technologies have been investigated, including ion-exchange, biological denitrification, and catalytic reduction. However, each method has its own advantages and disadvantages in field applica-tions. Here synergistic integrated technology combining adsorption and catalytic decomposition were demonstrated for complete removal of oxyanions ($ClO_4^{-}$, $NO_3^{-}$) from water. In the process, various metal supported adsor-bents are synthesized as adsorption/catalysis bifunctional materials. After the adsorbents were saturated with each oxyanions in an adsorption mode, the adsorbed anions were fully decomposed into nontoxic product by the catalytic function of the catalysts under $H_2$ atmosphere. In the case of $ClO_4^{-}$, Pd supported $ClO_4^{-}$-selective ion-exchange resin showed >90% decomposition rate of the adsorbed ClO4- within 24 h at 10 bar H2 and 373 K in the presence of ethanol. Also, complete decomposition of $NO_3^{-}$ into $N_2$ without the formation of harmful $NH_4^{+}$ was demonstrated by PdCu supported $NO_3^{-}$-selective ion-exchange resin under $H_2$/$CO_2$ (1/1, v/v) conditions. The adsorption-catalytic decomposition cycle in column could be repeated up to five times without loss of adsorption capacity and selectivity of $ClO_4^{-}$ or $NO_3^{-}$.
Advisors
Choi, Minkeeresearcher최민기researcher
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2016.2 ,[vii, 66 p. :]

Keywords

ion-exchange; perchlorate; nitrate; integrated process; catalysis; 이온교환; 퍼클로레이트; 나이트레이트; 융합기술; 촉매

URI
http://hdl.handle.net/10203/222186
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=648176&flag=t
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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