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A novel advanced oxidation process (AOP) of ultraviolet/chlorite-ammonia (UV/NaClO-NHOH) was developed to remove Hg from flue gas. The distribution of mercury concentration in three solutions of NaClO-NHOH, KCl, and HSO-KMnO was determined by cold atom fluorescence spectrometry (AFS). The role of NHOH was to help NaClO preserving and/or stabilizing Hg meanwhile inhibiting the photo-production of ClO. In the absence of UV, decreasing pH promoted the release of Hg from NaClO-NHOH; introducing NO, SO, O, Br, Cl, and HCO suppressed Hg oxidation. In the presence of UV, rising temperature accelerated the release of Hg from NaClO-NHOH; while SO, Br and HCO facilitated Hg oxidation. In the absence and presence of UV, Hg oxidation was controlled by ClO and by ClO/ClO/HO/ClO, respectively. The formations of ClO/HO/ClO were confirmed by electron spin resonance (ESR). X-ray photoelectron spectroscopy (XPS) revealed that the products of Hg and ClO were HgCl, and ClO, Cl-, ClO-, Cl, and ClO-, respectively. Analysis of kinetics showed that the Hatta numbers were 23-133 and 69-305 without and with UV, respectively, thus, the gas-film mass transfer was the rate-determining step. This paper gives a new insight in radical behavior in Hg oxidation.
This article was published in the following journal.
Name: Journal of hazardous materials
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