Enhanced Arsenic (III and V) Removal in Anoxic Environments by Hierarchically Structured Citrate/FeCO3 Nanocomposites.

摘要: Novel citrate/FeCO3 nanocomposites (CF-NCs) were synthesized for effective arsenic (III and V) sorption with constant addition of Fe2+ into HCO3− solution in the presence citrate. This paper is first report on formation CF-NCs, this study we investigate mechanisms uptake by sorbent under anoxic conditions through various solid- liquid-phase spectroscopic methods, including X-ray absorption spectroscopy. In citrate was found to be incorporated structure siderite (up 17.94%) (Fe2+citrate)− complexes. The crystal morphology rhombohedral changed hierarchically nanostructured spherical aggregates composed several sheet-like crystals, which improved surface reactivity sufficient Compared pure (15.2%), enhanced removal As(III) range 19.3% 88.2% observed, depending amount maximum capacities CF-NCs As(V) 188.97 290.22 mg/g, respectively, are much higher than those previously reported siderite-based adsorbents. It that occurred via bidentate corner-sharing complexation, predominantly without changes oxidation states. These results suggest can attenuated environments, attenuation even more when modified incorporation organic compounds such as