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나노크기 Fe° 분말을 이용한 질산성 질소의 환원 탈질 반응의 반응속도론
최승희(Seung Hee Choe),김지형(Jee Hyeong Khim),장윤영(Yoon Young Chang),황경엽(Kyung Yub Hwang) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.2
For environmental remediation of a contaminated groundwater plume the use of zero-valent metal represents one of the latest innovative technologies. In this paper, the kinetics of denitrification by zero-valent iron (Fe°) has been studied for an analysis of factors effecting contaminant degradation rates. Batch studies demonstrated that synthesized nanoscale iron granular, characterized by high surface area to mass ratios(31.4㎡/g) and high reactivities can quickly remove nitrate from nitrate-polluted water within minutes. Compared the ability of nanoscale Fe° with that of microscale Fe° to destruct reductively nitrate at room temperature (23℃), the reactivity of Fe° with nitrate depends on its specific surface area and shows higher observed reaction rate constant k_(obs) with nanoscale iron powder. The reductive reaction of nitrate with nanoscale Fe° indicated that the degradation of nitrate appeared to be pseudo first-order with respect to nitrate concentration, with the observed reaction rate constant k_(obs) (0.1463 min^(-1)) appearing to be directly proportional to the specific surface area to volume ratio. The minimal effects of muting rate (rpm) on nitrate reduction rates suggest that the observed reaction rates were controlled by mass transfer of the nitrate to the metal surface in low mixing intensity.
영가철($Fe^0$)을 이용한 퇴적물내 Atrazine의 탈염소화
김건하,정우혁,최승희,Kim, Geon-Ha,Jeong, Woo-Hyeok,Choe, Seung-Hee 한국지하수토양환경학회 2006 지하수토양환경 Vol.11 No.4
농경지에서 부유물질과 결합하여 비점원형태로 발생하는 잔류농약은 하류에 퇴적물로 침전되어 지표수를 오염시킬 수 있다. 이 연구는 트리아진계 제초제인 아트라진이 퇴적물에 포함되어 있는 경우 0가철(Zero-valent Iron, ZVI)을 이용한 탈염소화 반응 속도를 측정하였다. 실험결과 퇴적물의 완충능이 pH를 중성으로 유지시킴으로서 탈염소 반응이 지속됨을 알 수 있었다. 퇴적물에 아트라진을 10, 30, 50 mg Atrazine/L of total sediment로 오염시키고 0가철을 투여하여 아트라진의 농도변화를 측정함으로서 탈염소화 속도를 추정하였다. 탈염소화 속도는 아트라진 초기농도 10 mg/L인 경우 $1.38x10^{-1}/d$, 30 mg/L인 경우 $1.29x10^{-l}/d$, 50 mg/L인 경우 $7.43x10^{-2}/d$이었으며, 초기농도가 50 mg/L이고 영가철을 투입하지 않은 경우 속도상수는 $3.05x10^{-2}/d이었다. 영가철에 의한 아트라진 농도 반감기는 초기 농도 10 mg/L일때 5.03 d, 30 mg/L일때 5.38 d, 50 mg/L일때 9.33 d이었으며, 초기농도가 50 mg/L이고 영가철을 투입하지 않을 경우 22.73 d로 나타났다. Residual pesticides discharged from diffuse sources at agricultural area in association with suspended solid will be settled at downstream, and may degrade surface water quality. This research studied dechlorination kinetic of atrazine, one of triazine-category herbicide, using zero-valent iron (ZVI) in sediment. It can be observed from the experiments that buffer capacity of sediment helped pH maintained beutral, resulted in continuous dechlorination. Sediments were spiked with atrazine at 10, 30, and 50 mg atrazine/L of total sediment for batch experiments. Dechlorination constants were $1.38x10^{-1}/d$ for the initial concentration of 10 mg/L, $1.29x10^{-l}/d$ for 30 mg/L, and $7.43x10^{-2}/d$ for 50 mg/L while dechlorination constants of initial concentration of 50 mg/L without ZVI adding were estimated as $3.05x10^{-2}/d. Half lifes atrazine by ZVI were estimated as 5.03 d fur 10 mg/L, 5.38 d for 30 mg/L, and 9.33 d for 50 mg/L, respectively.
장윤영(Yoon Young Chang),최승희(Seung Hee Choe),신정엽(Jung Yup Shin),황경엽(Kyung Yub Hwang) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.4
In recent years considerable efforts for the removal of nitrate have been made in the development of nitrate removal techniques. One of the conventional treatment methods of nitrate is biological denitrification. However, this process needs other carbon sources for microbial activities and a long period of time to reduce the nitrate level in polluted water. In this study nitrate reduction using synthesized zero-valent iron powder(Fe˚) with nanoscale was proposed in situ or above-ground treatment of nitrate-polluted water at room temperatures and pressures. Nanoscale iron removed 50, 100, 200, and 400㎎/l of nitrate within 30min with little intermediates. Compared with commercial iron powders(15∼75㎛), the synthesized iron powder(1∼100㎚) showed high removal efficiencies(10∼100times) in a short time period with low metal to solution ratio(4∼10g/100㎖). The approach presented offers unique opportunities for both fundamental research and technological applications of zero-valent metals to nitrate-polluted water. For example, iron can be used to construct a reactive barrier in the path of a contaminated groundwater plume to remove NO_(3-).