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  • 1
    Language: English
    In: Chemical Engineering Journal, 15 September 2017, Vol.324, pp.324-335
    Description: Uncertainties of aging after the injection of microscale zero valent iron (mZVI) into subsurface hinder the widespread application of this technology into in-situ groundwater remediation. As TCE removal by mZVI is usually accompanied by mZVI anaerobic reaction with water, this study investigated the hydrogen evolution kinetics, TCE removal performance, and electron efficiency (EE) of mZVI particles under single and combined effects of organic geochemical constituents (humic acid (HA)), inorganic constituents (hardness (Ca ) and alkalinity (HCO )) in groundwater. The results showed that both H generation and TCE removal were enhanced in the presence of HA (5–20 mg L as DOC), and significant delay of aging precipitates formation was supported by SEM-EDS, XRD and XPS depth-profiling characterization. With increasing Ca -HCO concentrations (0.4–2 mM), the mZVI corrosion were inhibited for the formation of a thin compact passive film on mZVI surface. Furthermore, in co-presence of organic and inorganic constituents, the negatively-impacted iron corrosion kinetics suggested that promotional effects of organic constituents were dwarfed by the inhibitory effects of inorganic constituents. In addition, the EE values in different systems ranged among 1.31–7.40%, and decreased significantly with time. Hence, these findings provide insight into aging mechanism and performance prediction of mZVI under different groundwater geochemical conditions.
    Keywords: Mzvi ; Aging ; Electron Efficiency ; Geochemical Constituent ; Tce ; Engineering
    ISSN: 1385-8947
    E-ISSN: 1873-3212
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  • 2
    Language: English
    In: Chemical Engineering Journal, 01 July 2015, Vol.271, pp.164-172
    Description: Xanthan gum-coated microscale zero valent iron (XG-mZVI) is potentially an inexpensive and effective material to promote the degradation of environmental contaminants. The effects of geochemical constituents (humic acid (HA), ) on trichloroethylene (TCE) removal using XG-mZVI were investigated using batch experiments to evaluate the potential performance of XG-mZVI in field treatments. TCE was removed from groundwater by adsorption and chemical reduction. In the co-presence of geochemical constituents, TCE adsorption was not significantly impacted, while its reduction rate was increased by the presence of HA (5–20 mg L ), inhibited with increasing Ca(HCO ) and Mg(HCO ) concentrations (0.4–2 mM) and unaffected by NaCl in the range of 10–100 mM. The promotional effect of HA on TCE reduction was primarily due to the Fe-humate complexes in solution that delayed the formation of passivated precipitates. However, the presence of Ca(HCO ) and Mg(HCO ) exerted an opposite effect on TCE reduction by facilitating the formation of passivated precipitates, such as green iron rust. These findings provide insight into the impact mechanism of XG-mZVI reactivity by organic and inorganic geochemical constituents with particular implications for the XG-mZVI degradation of TCE in real groundwater.
    Keywords: Microscale Zero-Valent Iron (Mzvi) ; Xanthan Gum (Xg) ; Trichloroethylene (Tce) ; Geochemical Constituent ; Engineering
    ISSN: 1385-8947
    E-ISSN: 1873-3212
    Source: ScienceDirect Journals (Elsevier)
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  • 3
    Language: English
    In: Chemical Engineering Journal, July 1, 2015, Vol.271, p.164(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.cej.2015.02.092 Byline: Jia Xin, Xilai Zheng, Jun Han, Haibing Shao, Olaf Kolditz Abstract: Display Omitted Article History: Received 15 December 2014; Revised 15 February 2015; Accepted 25 February 2015
    Keywords: Groundwater ; Polysaccharides
    ISSN: 1385-8947
    Source: Cengage Learning, Inc.
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