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Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles.
Water Res. 2014 Oct 15; 63:102-11.WR

Abstract

Nanoscale zerovalent iron (nZVI) has demonstrated high efficacy for treating nitrate or cadmium (Cd) contamination, but its efficiency for simultaneous removal of nitrate and Cd has not been investigated. This study evaluated the reactivity of nZVI to the co-contaminants and by-product formation, employed different catalysts to reduce nitrite yield from nitrate, and examined the transformation of nZVI after reaction. Nitrate reduction resulted in high solution pH, negatively charged surface of nZVI, formation of Fe3O4 (a stable transformation of nZVI), and no release of ionic iron. Increased pH and negative charge contributed to significant increase in Cd(II) removal capacity (from 40 mg/g to 188 mg/g) with nitrate present. In addition, nitrate reduction by nZVI could be catalyzed by Cd(II): while 30% of nitrate was reduced by nZVI within 2 h in the absence of Cd(II), complete nitrate reduction was observed in the presence of 40 mg-Cd/L due to the formation of Cd islands (Cd(0) and CdO) on the nZVI particles. While nitrate was reduced mostly to ammonium when Cd(II) was not present or at Cd(II) concentrations ≥ 40 mg/L, up to 20% of the initial nitrate was reduced to nitrite at Cd(II) concentrations < 40 mg/L. Among nZVI particles doped with 1 wt. % Cu, Ag, or Au, nZVI deposited with 1 wt. % Au reduced nitrite yield to less than 3% of the initial nitrate, while maintaining a high Cd(II) removal capacity.

Authors+Show Affiliations

State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China; Bren School of Environmental Science & Management, University of California, Santa Barbara, 3420 Bren Hall, CA 93106, USA; University of California Center for Environmental Implications of Nanotechnology, Santa Barbara, CA, USA.Bren School of Environmental Science & Management, University of California, Santa Barbara, 3420 Bren Hall, CA 93106, USA; University of California Center for Environmental Implications of Nanotechnology, Santa Barbara, CA, USA.Bren School of Environmental Science & Management, University of California, Santa Barbara, 3420 Bren Hall, CA 93106, USA.State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China.State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China; College of Civil Engineering, Tongji University, Shanghai 200092, China.State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China.State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China; Key Laboratory of Yangtze Water Environment for Ministry of Education, Tongji University, Shanghai 200092, China. Electronic address: zhangyalei@tongji.edu.cn.Bren School of Environmental Science & Management, University of California, Santa Barbara, 3420 Bren Hall, CA 93106, USA; University of California Center for Environmental Implications of Nanotechnology, Santa Barbara, CA, USA. Electronic address: keller@bren.ucsb.edu.

Pub Type(s)

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

Language

eng

PubMed ID

24999115

Citation

Su, Yiming, et al. "Simultaneous Removal of Cadmium and Nitrate in Aqueous Media By Nanoscale Zerovalent Iron (nZVI) and Au Doped nZVI Particles." Water Research, vol. 63, 2014, pp. 102-11.
Su Y, Adeleye AS, Huang Y, et al. Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles. Water Res. 2014;63:102-11.
Su, Y., Adeleye, A. S., Huang, Y., Sun, X., Dai, C., Zhou, X., Zhang, Y., & Keller, A. A. (2014). Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles. Water Research, 63, 102-11. https://doi.org/10.1016/j.watres.2014.06.008
Su Y, et al. Simultaneous Removal of Cadmium and Nitrate in Aqueous Media By Nanoscale Zerovalent Iron (nZVI) and Au Doped nZVI Particles. Water Res. 2014 Oct 15;63:102-11. PubMed PMID: 24999115.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles. AU - Su,Yiming, AU - Adeleye,Adeyemi S, AU - Huang,Yuxiong, AU - Sun,Xiaoya, AU - Dai,Chaomeng, AU - Zhou,Xuefei, AU - Zhang,Yalei, AU - Keller,Arturo A, Y1 - 2014/06/19/ PY - 2014/04/10/received PY - 2014/06/06/revised PY - 2014/06/08/accepted PY - 2014/7/8/entrez PY - 2014/7/8/pubmed PY - 2015/10/16/medline KW - Bimetallic nanoparticles KW - Cd removal KW - Nanoscale zerovalent iron KW - Nitrate reduction SP - 102 EP - 11 JF - Water research JO - Water Res. VL - 63 N2 - Nanoscale zerovalent iron (nZVI) has demonstrated high efficacy for treating nitrate or cadmium (Cd) contamination, but its efficiency for simultaneous removal of nitrate and Cd has not been investigated. This study evaluated the reactivity of nZVI to the co-contaminants and by-product formation, employed different catalysts to reduce nitrite yield from nitrate, and examined the transformation of nZVI after reaction. Nitrate reduction resulted in high solution pH, negatively charged surface of nZVI, formation of Fe3O4 (a stable transformation of nZVI), and no release of ionic iron. Increased pH and negative charge contributed to significant increase in Cd(II) removal capacity (from 40 mg/g to 188 mg/g) with nitrate present. In addition, nitrate reduction by nZVI could be catalyzed by Cd(II): while 30% of nitrate was reduced by nZVI within 2 h in the absence of Cd(II), complete nitrate reduction was observed in the presence of 40 mg-Cd/L due to the formation of Cd islands (Cd(0) and CdO) on the nZVI particles. While nitrate was reduced mostly to ammonium when Cd(II) was not present or at Cd(II) concentrations ≥ 40 mg/L, up to 20% of the initial nitrate was reduced to nitrite at Cd(II) concentrations < 40 mg/L. Among nZVI particles doped with 1 wt. % Cu, Ag, or Au, nZVI deposited with 1 wt. % Au reduced nitrite yield to less than 3% of the initial nitrate, while maintaining a high Cd(II) removal capacity. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/24999115/Simultaneous_removal_of_cadmium_and_nitrate_in_aqueous_media_by_nanoscale_zerovalent_iron__nZVI__and_Au_doped_nZVI_particles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(14)00437-0 DB - PRIME DP - Unbound Medicine ER -