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Effect of promoter and noble metals and suspension pH on catalytic nitrate reduction by bimetallic nanoscale Fe(0) catalysts.
Environ Technol. 2016; 37(9):1077-87.ET

Abstract

Experiments were conducted to investigate the effect of experimental factors (types of promotor and noble metals, H2 injection, and suspension pH) on catalytic nitrate reduction by bimetallic catalysts supported by nanoscale zero-valent iron (NZVI). NZVI without H2 injection showed 71% of nitrate reduction in 1 h. Cu/NZVI showed the almost complete nitrate reduction (96%) in 1 h, while 67% of nitrate was reduced by Ni/NZVI. The presence of noble metals (Pd and Pt) on Cu/NZVI without H2 injection resulted in the decrease of removal efficiency to 89% and 84%, respectively, due probably to the electron loss of NZVI for formation of metallic Pd and Pt. H2 injection into Cu-Pd/NZVI suspension significantly improved both catalytic nitrate reduction (>97% in 30 min) and N2 selectivity (18%), indicating that adsorbed H on active Pd sites played an important role for the enhanced nitrate reduction and N2 selectivity. The rapid passivation of NZVI surface resulted in a dramatic decrease in nitrate reduction (79-28%) with an increase in N2 selectivity (8-66%) as the suspension pH increased from 8 to 10.

Authors+Show Affiliations

a Institute for Nuclear Waste Disposal , Karlsruhe Institute of Technology , Karlsruhe , Germany. b Department of Civil and Environmental Engineering , Korea Advanced Institute of Science and Technology , Yuseong-gu , Daejeon , Republic of Korea.b Department of Civil and Environmental Engineering , Korea Advanced Institute of Science and Technology , Yuseong-gu , Daejeon , Republic of Korea.c GS Engineering and Construction , Jongno-gu , Seoul , Republic of Korea.d Department of Nuclear and Quantum Engineering , Korea Advanced Institute of Science and Technology , Yuseong-gu , Daejeon , Republic of Korea.b Department of Civil and Environmental Engineering , Korea Advanced Institute of Science and Technology , Yuseong-gu , Daejeon , Republic of Korea.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26512419

Citation

Bae, Sungjun, et al. "Effect of Promoter and Noble Metals and Suspension pH On Catalytic Nitrate Reduction By Bimetallic Nanoscale Fe(0) Catalysts." Environmental Technology, vol. 37, no. 9, 2016, pp. 1077-87.
Bae S, Hamid S, Jung J, et al. Effect of promoter and noble metals and suspension pH on catalytic nitrate reduction by bimetallic nanoscale Fe(0) catalysts. Environ Technol. 2016;37(9):1077-87.
Bae, S., Hamid, S., Jung, J., Sihn, Y., & Lee, W. (2016). Effect of promoter and noble metals and suspension pH on catalytic nitrate reduction by bimetallic nanoscale Fe(0) catalysts. Environmental Technology, 37(9), 1077-87. https://doi.org/10.1080/09593330.2015.1101166
Bae S, et al. Effect of Promoter and Noble Metals and Suspension pH On Catalytic Nitrate Reduction By Bimetallic Nanoscale Fe(0) Catalysts. Environ Technol. 2016;37(9):1077-87. PubMed PMID: 26512419.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of promoter and noble metals and suspension pH on catalytic nitrate reduction by bimetallic nanoscale Fe(0) catalysts. AU - Bae,Sungjun, AU - Hamid,Shanawar, AU - Jung,Junyoung, AU - Sihn,Youngho, AU - Lee,Woojin, Y1 - 2015/10/29/ PY - 2015/10/30/entrez PY - 2015/10/30/pubmed PY - 2016/12/15/medline KW - H2 injection KW - NZVI KW - Nitrate KW - bimetallic catalyst KW - pH SP - 1077 EP - 87 JF - Environmental technology JO - Environ Technol VL - 37 IS - 9 N2 - Experiments were conducted to investigate the effect of experimental factors (types of promotor and noble metals, H2 injection, and suspension pH) on catalytic nitrate reduction by bimetallic catalysts supported by nanoscale zero-valent iron (NZVI). NZVI without H2 injection showed 71% of nitrate reduction in 1 h. Cu/NZVI showed the almost complete nitrate reduction (96%) in 1 h, while 67% of nitrate was reduced by Ni/NZVI. The presence of noble metals (Pd and Pt) on Cu/NZVI without H2 injection resulted in the decrease of removal efficiency to 89% and 84%, respectively, due probably to the electron loss of NZVI for formation of metallic Pd and Pt. H2 injection into Cu-Pd/NZVI suspension significantly improved both catalytic nitrate reduction (>97% in 30 min) and N2 selectivity (18%), indicating that adsorbed H on active Pd sites played an important role for the enhanced nitrate reduction and N2 selectivity. The rapid passivation of NZVI surface resulted in a dramatic decrease in nitrate reduction (79-28%) with an increase in N2 selectivity (8-66%) as the suspension pH increased from 8 to 10. SN - 1479-487X UR - https://www.unboundmedicine.com/medline/citation/26512419/Effect_of_promoter_and_noble_metals_and_suspension_pH_on_catalytic_nitrate_reduction_by_bimetallic_nanoscale_Fe_0__catalysts_ L2 - http://www.tandfonline.com/doi/full/10.1080/09593330.2015.1101166 DB - PRIME DP - Unbound Medicine ER -