CHUANYONG JING, GEORGE P. KORFIATIS
The study investigates the immobilization mechanisms of arsenate [As(V)] within iron hydroxide sludge that has been stabilized with cement, utilizing leaching tests, Fourier transform infrared spectroscopy (FTIR), extended X-ray absorption fine structure (EXAFS) spectroscopy, and thermodynamic modeling. The sludge, sourced from a groundwater remediation site in Tacoma, WA, was mixed with premixed cement at various cement-to-sludge ratios (2.5, 3.3, 5, 10, and 20 wt premixed cement/wt dry sludge). Analysis through EXAFS indicated that As(V) formed bidentate mononuclear complexes on the iron hydroxide surface in the sludge. The adsorbed As(V) demonstrated a distinctive FTIR peak at 830 cm-1. Treatment with cement resulted in the conversion of adsorbed As(V) into calcium arsenate precipitate, identified by a FTIR peak at 860 cm-1. The chemical forms of As(V) were incorporated into an adsorption triple layer model (TLM) to explain the leaching behavior of As(V) across a pH range of 3 to 12. Results showed that cement treatment significantly reduced arsenic mobility due to the formation of the sparingly soluble calcium arsenate.
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title={Immobilization Mechanisms of Arsenate in},
author={CHUANYONG JING and GEORGE P. KORFIATIS},
year={2026},
language={en}
}TY - JOUR TI - Immobilization Mechanisms of Arsenate in AU - CHUANYONG JING AU - GEORGE P. KORFIATIS PY - 2026 LA - en ER -
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