In order to treat groundwater containing high levels of nitrate, nitrate reduction by nano sized zero-valent iron (nZVI) was studied using batch experiments. Compared to nitrate removal efficiencies at different mass ratios of nitrate/Fe0, the removal efficiency at the mass ratio of 0.02% was the highest(54.59%). To enhance nitrate removal efficiency, surface modification of nZVI was performed using metallic catalysis such as Pd, Ni and Cu. Nitrate removal efficiency by Cu-nZVI (at catalyst/Fe0 mass ratio of 0.1%) was 66.34%. It showed that the removal efficiency of Cu-nZVI was greater than that of the other catalysts. The observed rate constant (kobs) of nitrate reduction by Cu-nZVI was estimated to 0.7501 min-1 at the Cu/Fe mass ratio of 0.1%. On the other hand, TEM images showed that the average particle sizes of synthetic nZVI and Cu-nZVI were 40~60 and 80~100 nm, respectively. The results imply that catalyst effects may be more important than particle size effects in the enhancement of nitrate reduction by nZVI.

Abstract
 1. 서 론
 2. 실험 방법
  2.1. 영가철 나노입자의 제조
  2.2. 영가철 나노입자의 표면개질
  2.3. 질산성 질소 제거
 3. 결과 및 고찰
  3.1. 영가철 나노입자의 주입량에 따른 질산성질소 제거율
  3.2. 영가철 나노입자의 접촉시간에 따른 질산성질소제거율
  3.3. 표면개질된 영가철 나노입자의 질산성질소 제거율
  3.4. 표면개질된 영가철 나노입자의 물리적 특성
  3.5. 표면개질된 영가철 나노입자의 동력학적 특성
 4. 결 론
 감사의 글
 REFERENCES

• 임태숙(광운대학교 환경공학과, Dept. of Environmental Engineering, Kwangwoon University) | Taesook Lim
• 조윤철(광운대학교 환경공학과, Dept. of Environmental Engineering, Kwangwoon University) | Yunchul Cho
• 조장환(광운대학교 환경공학과, Dept. of Environmental Engineering, Kwangwoon University) | Changhwan Cho
• 최상일(광운대학교 환경공학과, Dept. of Environmental Engineering, Kwangwoon University) | Sangil Choi Corresponding author