期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 280, 期 -, 页码 71-78出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.07.056
关键词
Mn-Fe; XPS; Adsorption; Mercury
资金
- National Science & Technology Pillar Program, China [2012BAC05B02]
- Funds for Creative Research Group of China [51121062]
- National Natural Science Foundation of China [51008104]
- funds of the State Key Laboratory of Urban Water Resource and Environment (HIT) [2013TS04]
- Fundamental Research Funds for the Central Universities (HIT) [NS-RIF. 201188]
The efficiency and mechanism of trace mercury (Hg(II)) removal by in situ formed manganese-ferric (hydr)oxides (in situ Mn-Fe) were investigated by reacting KMnO4 with Fe(II) in simulated solutions and natural water. In the simulated solutions, the impact of coagulant dosage, pH, and temperature on mercury removal was studied. Experimental results showed that in situ Mn-Fe more effectively removed mercury compared with polyaluminum chloride (PAC) and iron(III) chloride (FeCl3), and that mercury existed in the form of uncharged species, namely Hg(OH)(2), HgClOH(aq), and HgCl2(aq). Fourier transform infrared spectroscopy demonstrated that in situ Mn-Fe contained hydroxyl groups as the surface active sites, while X-ray photoelectron spectroscopy (XPS) measurements revealed that MnO2 or MnOOH and FeOOH were the dominant species in the precipitates. XPS analysis indicated that an Hg-Mn-Fe mixture was formed in the precipitates, suggesting that mercury was removed from solutions via transfer from the liquid phase to solid phase. These results indicated that the primary mercury removal mechanisms in in situ Mn-Fe were surface complexation and flocculation-precipitation processes. Satisfactory removal efficiency of mercury was also observed following in situ Mn-Fe in natural waters. (C) 2014 Elsevier B.V. All rights reserved.
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