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• W2613761898 endingPage "2569" @default.
• W2613761898 startingPage "2564" @default.
• W2613761898 abstract "Abstract The unique surface properties exhibited by engineered iron oxide nanoparticle have been widely exploited in heterogeneous catalysis and environmental remediation of different pollutants. In the current study, commercial available 50 nm γ-Fe 2 O 3 and 5 μm α-Fe 2 O 3 were examined with respect to their adsorption for Cr(VI) and the effect on Cr(VI) reduction by citric acid. Adsorption capacity of Cr(VI) on nano-sized particles was higher than that on micron-sized particles. Adsorption of Cr(VI) onto the surfaces of 50 nm γ-Fe 2 O 3 particle would be inhibited with the increase in ionic strength, while which shows no influence on that for 5 μm α-Fe 2 O 3 particles. The difference in ATR-FTIR spectra between aqueous and adsorbed Cr(VI) on iron oxide surfaces indicated the formation of inner-sphere complexes on the surfaces. Reduction of Cr(VI) by citric acid alone proceeded slowly, while the addition of iron oxide could markedly accelerate the transformation of Cr(VI) to Cr(III) with the rate for 50 nm γ-Fe 2 O 3 particles more faster than that for 5 μm α-Fe 2 O 3 particles. The mechanisms were ascribed to the auto-reduction of aqueous Fe(III)-citrate complexes and the subsequent Fe(III)/Fe(II) redox cycle. The different reaction rate mention above was related with the amounts of Fe(III) released from the iron oxides dissolution. Kinetic results confirmed the direct electron transfer between adsorbed Cr(VI) and citric acid on the surfaces could be ruled out because Cr(VI) adsorption was completely suppressed by the co-existing anionic solutes. The findings above indicated the environmental risk posed by Cr(VI) could be alleviated when iron oxide and organic acids were present, which accordingly be helpful for formulating remediation strategy of Cr(VI)-polluted soils." @default.
• W2613761898 created "2017-05-19" @default.
• W2613761898 creator A5021334294 @default.
• W2613761898 creator A5069112792 @default.
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• W2613761898 date "2017-06-01" @default.
• W2613761898 modified "2023-10-14" @default.
• W2613761898 title "Chromium (VI) reduction in the nano- or micron-sized iron oxide – Citric acid systems: Kinetics and mechanisms" @default.
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• W2613761898 doi "https://doi.org/10.1016/j.jece.2017.05.011" @default.
• W2613761898 hasPublicationYear "2017" @default.
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