Environmental Science and Pollution Research

, Volume 24, Issue 30, pp 23538–23548 | Cite as

Effect of solution pH on aging dynamics and surface structural evolution of mZVI particles: H2 production and spectroscopic/microscopic evidence

Research Article
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Abstract

A microscale zero-valent iron (mZVI)-based in situ reactive zone is a promising technology for contaminated groundwater remediation. Estimation of mZVI aging behavior after its injection into the subsurface is essential for efficiency and longevity assessments. In this study, batch tests were conducted to investigate the effect of initial pH on mZVI aging dynamics, as well as the formation and evolution of aging products over 112 days. Results indicated that mZVI aging accelerated with decreasing initial pH. Corrosion rates of mZVI particles under pH 6.0 and 7.5 were approximately two orders of magnitude higher than those observed at pH 9.0. The morphological, structural, and compositional evolution of mZVI particles in three systems (pH = 6.0, 7.5, and 9.0) were investigated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In acidic and neutral solutions, a thick passivation layer with loosely and unevenly distributed aging precipitates was observed, and Fe3O4 was the final aging precipitate. Nevertheless, in alkaline solutions, minute aging precipitates were detected on the mZVI surface at 112 day. Characterization results suggested that mZVI was oxidized via the Fe0–Fe(OH)2–Fe3O4 route. These findings shed new light on mZVI aging mechanisms, particularly its physicochemical characteristics and the structural evolution of mZVI in field-scale groundwater remediation applications.

Keywords

Microscale zero-valent iron (mZVI) Anaerobic corrosion Hydrogen production Corrosion rate Aging products 

Notes

Acknowledgments

The authors thank the National Natural Science Foundation of China (51408571), the China Postdoctoral Science Special Foundation (2017T100517), and the Key Program of National Natural Science Foundation of China (41731280) for their generous financial support.

Supplementary material

11356_2017_9976_MOESM1_ESM.docx (9.8 mb)
ESM 1 (DOCX 10059 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering; College of Environmental Science and EngineeringOcean University of ChinaQingdaoChina
  2. 2.College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchongChina
  3. 3.Helmholtz Center for Environmental Research UFZ/TU DresdenLeipzigGermany
  4. 4.Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and EngineeringShandong UniversityJinanChina

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