Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

被引：36

作者：

Su, Yiming ^{[1
,2
,3
]}

Adeleye, Adeyemi S. ^{[2
,3
]}

Zhou, Xuefei ^{[1
]}

Dai, Chaomeng ^{[1
,4
]}

Zhang, Weixian ^{[1
]}

Keller, Arturo A. ^{[2
,3
]}

Zhang, Yalei ^{[1
]}

机构：

[1] Tongji Univ, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China

[2] Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Ctr Environm Implicat Nanotechnol, Santa Barbara, CA 93106 USA

[4] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2014年 / 280卷

基金：

中国国家自然科学基金;

关键词：

Nanoscale zerovalent iron; Lead pollution; Nitrate influence; Ferrite process; Oxidation-reduction potential; ZERO-VALENT IRON; TEMPERATURE FERRITE PROCESS; CORE-SHELL STRUCTURE; DRINKING-WATER; AQUEOUS-SOLUTION; NANOPARTICLES; REMOVAL; REACTIVITY; REDUCTION; PARTICLES;

D O I：

10.1016/j.jhazmat.2014.08.040

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Nanoscale zerovalent iron (nZVI) is efficient for removing Pb2+ and nitrate from water. However, the influence of nitrate, a common groundwater anion, on Pb2+ removal by nZVI is not well understood. In this study, we showed that under excess Fe conditions (molar ratio of Fe-0/nitrate > 4), Pb2+ ions were immobilized more quickly (<5 min) than in nitrate-free systems (similar to 15 min) due to increasing pH. With nitrate in excess (molar ratio of Fe-0/nitrate < 4), nitrate stimulated the formation of crystal PbxFe3-xO4 (ferrite), which provided additional Pb2+ removal. However, similar to 7% of immobilized Pb2+ ions were released into aqueous phase within 2 h due to ferrite deformation. Oxidation-reduction potential (ORP) values below -600 mV correlated with excess Fe-0 conditions (complete Pb2+ immobilization), while ORP values >=-475 mV characterized excess nitrate conditions (ferrite process and Pb2+ release occurrence). This study indicates that ORP monitoring is important for proper management of nZVI-based remediation in the subsurface to avoid lead remobilization in the presence of nitrate. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：504 / 513

页数：10

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