Yong H. Huang, Tian C. Zhang
Under anoxic conditions, zerovalent iron (Fe0) reduces nitrate to ammonia, and magnesium (Fe2O3) is produced at near-neutral pH. Nitrate removal was most rapid at pH 1; however, the formation of a black oxide film at pH 5 to 8 temporarily halted or slowed the reaction unless the system was augmented with Fe2+, Cu2+, or Al3+. Bathing coordinating Fe2+ in an Fe0 solution greatly enhanced nitrate reduction at near-neutral pH and coincided with the formation of a black precipitate. X-ray diffraction and scanning electron microscopy confirmed that both the black precipitate and black oxide coating on the iron surface were magnetic. In this system, ferrous iron was determined to be a partial contributor to nitrate removal, but nitrate reduction was not observed in the absence of Fe. Nitrate removal was also enhanced by augments in the Fe-H2O system with Fe2+, Cu2+, or Al3+ but not Ca2+, Mg2+, or Zn2+. Our research indicates that a magnetic coating is not a hindrance to nitrate reduction by Fe0, provided sufficient aqueous Fe2+ is present in the system.
@article{b8bebe21-e2ba-4202-8fb1-9a25aba43615,
title={Effects of Oxide Coating and Selected Ca},
author={Yong H. Huang and Tian C. Zhang},
year={2026},
language={en}
}TY - JOUR TI - Effects of Oxide Coating and Selected Ca AU - Yong H. Huang AU - Tian C. Zhang PY - 2026 LA - en ER -
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