DOI QR코드

DOI QR Code

A Study on Enhancement of Nitrate Removal Efficiency using Surface-Modified Zero-Valent Iron Nanoparticles

표면개질된 영가철 나노입자를 이용한 질산성 질소 제거율 향상에 대한 연구

  • Lim, Taesook (Dept. of Environmental Engineering, Kwangwoon University) ;
  • Cho, Yunchul (Dept. of Environmental Engineering, Kwangwoon University) ;
  • Cho, Changhwan (Dept. of Environmental Engineering, Kwangwoon University) ;
  • Choi, Sangil (Dept. of Environmental Engineering, Kwangwoon University)
  • 임태숙 (광운대학교 환경공학과) ;
  • 조윤철 (광운대학교 환경공학과) ;
  • 조장환 (광운대학교 환경공학과) ;
  • 최상일 (광운대학교 환경공학과)
  • Received : 2016.01.12
  • Accepted : 2016.03.24
  • Published : 2016.04.30

Abstract

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 $nitrate/Fe^0$, 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 $catalyst/Fe^0$ 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 ($k_{obs}$) of nitrate reduction by Cu-nZVI was estimated to $0.7501min^{-1}$ 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.

Keywords

Nitrate;Zero-valent iron;Nano particle;Surface modification;Metallic catalyst

Acknowledgement

Supported by : 광운대학교

References

  1. Barber, W. P., Stuckey, D. C., 2000, Nitrogen removal in a modified anaerobic baffled reactor (ABR): 1, denitrification, Water research, 34(9), 2413-2422. https://doi.org/10.1016/S0043-1354(99)00425-X
  2. Candido, L., Gomes, J. A., 2011, Evaluation of anode materials for the electro-oxidation of ammonia and ammonium ions, Mat. Chem. and Phys., 129, 1146-1151. https://doi.org/10.1016/j.matchemphys.2011.05.080
  3. Chen, Y. M., Li, C. W., Chen, S. S., 2005, Fluidized zero valent iron bed reactor for nitrate removal, Chemoshere, 59(6), 753-759. https://doi.org/10.1016/j.chemosphere.2004.11.020
  4. Cheng, I. F., Muftikian, R., Fernando, Q., Korte, N., 1997, Reduction of nitrate to ammonia by zero-valent iron, Chemeoshere, 35(11), 2689-2695. https://doi.org/10.1016/S0045-6535(97)00275-0
  5. Cho, D. W., Jeon, B. H., Kim, Y. J., Song, H. C., 2010, The effect of fumed silica on nitrate reduction by zero-valent iron, J. Korean Soc. Environ. Eng., 32(6), 599-608.
  6. Cho, Y. C., Choi, S. I., 2009, A Study on transport characteristics of CMC-modified zero valent iron (ZVI) nanoparticles in porous media, J. Soil and Groundw. Environ., 14(6), 101-107.
  7. He, F., Zhao, D., 2007, Manipulating the size and dispersibility of zerovalent iron nanoparticles by use of carboxymethyl cellulose stabilizers, Environ. Sci. and Tech., 41(17), 6216-6221. https://doi.org/10.1021/es0705543
  8. He, F., Zhao, D., 2008, Hydrodechlorination of trichloroethene using stabilized Fe-Pd nanoparticles: Reaction mechanism and effects of stabilizers, catalysts and reaction conditions, Appl. Catal. B: Environ., 84(3-4), 533-540. https://doi.org/10.1016/j.apcatb.2008.05.008
  9. He, F., Zhao, D., Liu, J., Roberts, C. B., 2007, Stabilization of Fe-Pd nanoparticles with sodium carboxymethyl cellulose for enhanced transport and dechlorination of trichloroethylene in soil and groundwater, Ind. Eng. Chem. Res., 46(1), 29-34. https://doi.org/10.1021/ie0610896
  10. Huang, Y. H., Zhang, T. C., 2005, Modeling of nitrate adsorption and reduction in Fe^0-Packed columns through impulse loading tests, J. of Environ. Eng., 131(8), 1194-1202. https://doi.org/10.1061/(ASCE)0733-9372(2005)131:8(1194)
  11. Hwang, Y. H., Kim, D. G., Shin, H. S., 2011, Effects of synthesis conditions on the characteristics and reactivity of nano scale zero valent iron, Appl. Catal. B:Environ., 105(1-2), 144-150. https://doi.org/10.1016/j.apcatb.2011.04.005
  12. Ministry of Environment, 2009, Groundwater quality measurement network.
  13. Mossa Hosseini, S., Ataie-Ashtiani, B., Kholghi, M., 2011, Nitrate reduction by nano-Fe/Cu particles in packed column, Desalination, 276(1-3), 214-221. https://doi.org/10.1016/j.desal.2011.03.051
  14. Xie, L., Shang, C., 2006, Effects of copper and palladium on the reduction of bromate by Fe(0), Chemoshere, 64(6), 919-930. https://doi.org/10.1016/j.chemosphere.2006.01.042
  15. Zhang, H., Jin, Z., Han, L., Qin, C., 2006, Synthesis of nanoscale zero-valent iron supported on exfoliated graphite for removal of nitrate, Transactions of Nonferrous Metals Society of China, 16(1), 345-349. https://doi.org/10.1016/S1003-6326(06)60207-0