Chelate based-Fenton reaction for the degradation of chlorinated aliphatic hydrocarbons by new polymeric chelating agent (cross-linked chitosan)새로운 킬레이트 물질(chitosan)을 통한 염소계 지방족 화합물의 킬레이트 펜톤 분해

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Degradation of trichloroethylene (TCE) and tetrachloride (CT) by a modified Fenton reaction was investigated in aqueous solution. Fenton reaction can be significantly enhanced in the presence of Fe(II) chelated by cross-linked chitosan (CS) with glutaraldehyde (GLA) at near-neutral pH. A remarkable oxidative degradation of TCE ($1.838\h^{-1}$) was observed in modified Fenton system with Fe(II)-CS/GLA (10 mM and $2\g L^{-1}$, respectively) and $H_2 O_2$ (318 mM), while no significant degradation ($0.005\h^{-1}$) was observed in classic Fenton reaction system with Fe(II) (10 mM) and $H_2 O_2$ (318 mM) at pH 7 in 5 hrs. The kinetic rate constants for the degradation of TCE in modified Fenton system was dependent on the initial suspension pH, Fe(II) loading, CS/GLA dosage, and concentration of $H_2 O_2$. We have also observed 74.8 % of CT degradation by the Fe(II)-CS/GLA in modified Fenton system, while 43 % of CT degradation has been done in classic Fenton system in 10 hrs at pH 6. The degradation of CT in modified Fenton system was dependent on the concentration of $H_2 O_2$, Fe(II) loading, and concentration of CT. TCE and CT transformation was conducted by monitoring its disappearance and chloride ion ($Cl^{-}$) released with time. The concentration of $Cl^{-}$ was rapidly produced and its total mass recovery was reached more than 91 % during modified Fenton reaction. Addition of the hydroxyl radical scavenger 2-propanol to modified Fenton reactions significantly enhanced the CT degradation (removal efficiency from 57.2 % to 92.4 %), while TCE degradation was strongly inhibited in 5 hrs reaction time (removal efficiency from 74.7 % to 19.9 %). These results confirm the reductive reaction mechanism of CT by modified Fenton reaction with CS/GLA. Moreover, it shows that modified Fenton reaction with CS/GLA not only oxidizes TCE, but also effectively reduces CT at near-neutral pH. We observed the formation of surface Fe(II)-CS/GLA complex using microscopic analyses...
Advisors
Lee, Woo-Jinresearcher이우진researcher
Description
한국과학기술원 : 건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
418871/325007  / 020083383
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2010.2, [ iv, 33 p. ]

Keywords

trichloroethylene; iron sorption; chitosan; Fenton reaction; tetrachloride; 4염화탄소; 트리클로로에틸렌; 철이온 흡착; 키토산; 펜톤반응

URI
http://hdl.handle.net/10203/30688
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=418871&flag=dissertation
Appears in Collection
CE-Theses_Master(석사논문)
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