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• W1998577148 abstract "Galvanic couples composed of zero-valent iron and activated carbon (Fe0/AC) were investigated for As(V) removal from water. The effects of Fe0 to AC mass ratio (FCR), solution pH, ionic strength and co-existing anions (phosphate, carbonate, silicate, nitrate, chloride and sulfate) and humic acid (HA) on As(V) removal were evaluated. The results showed that the optimum mass ratio was 1:1, and Fe0/AC with this ratio was more effective for As(V) removal than Fe0 and AC alone at pH of 7 and ion strength of 0.03 M NaCl. The enhanced performance for As(V) removal was fulfilled through an accelerated corrosion process of Fe0, which meant more corrosion products for efficient As(V) removal. The As(V) removal followed a pseudo-first order reaction. The rate constants (k) for 1:1 Fe0/AC and Fe0 alone were 0.802 and 0.330 h−1, respectively. Potentiodynamic polarization scans further confirmed that Fe0 corrosion was promoted when Fe0 was coupled with AC. Except silicates, other co-existing anions promoted As(V) removal. No reduction form of As (As(III) or As(0)) could be detected on iron corrosion products (ICPs) and in solutions. Identified ICPs included poorly crystallized lepidocrocite (γ-FeOOH) and magnetite/maghemite (Fe3O4/γ-Fe2O3) for both of Fe0/AC and Fe0 systems. In conclusion, the Fe0/AC couple exhibited higher As removal performance than that of Fe0 alone from water." @default.
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• W1998577148 date "2010-10-01" @default.
• W1998577148 modified "2023-10-01" @default.
• W1998577148 title "Arsenate removal from water by zero-valent iron/activated carbon galvanic couples" @default.
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• W1998577148 doi "https://doi.org/10.1016/j.jhazmat.2010.06.004" @default.
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