Studies on the adsorption of chromium(VI) onto 3-Mercaptopropionic acid coated superparamagnetic iron oxide nanoparticles.
Chromium (Cr) in the form of Cr(VI) is deemed toxic in water due to its mutagenic and carcinogenic properties. For the successful removal of Cr(VI), we demonstrate a novel adsorbent consisting of superparamagnetic iron oxide nanoparticles (SPION) functionalized with 3-Mercaptopropionic acid (3-MPA). Fourier transform infrared spectroscopy (FT-IR) confirmed the functionalization of nanoparticles and presence of sulfonate groups. Batch adsorption experiments showed that the functionalized adsorbent recovered 45 mg of Cr(VI)/g of 3-MPA coated SPION at initial concentration of 50mg/L aqueous solution at pH 1 with less than 1% of Fe dissolution from SPION. The results from X-ray photoelectron spectroscopy confirmed that Cr(VI) chemisorbed onto the adsorbent. Hence, the XPS spectra did not indicate any reduction of Cr(VI) to Cr(III) upon adsorption. The adsorption data were better fitted for the Freundlich model. Moreover, the Cr(VI) adsorption kinetics on functionalized SPION followed a pseudo-second order rate, revealing chemisorption as the dominant mechanism. The high Cr(VI) removal, rapid adsorption kinetics and stability of adsorbent indicate that 3-MPA coated SPION could be an efficient adsorbent for the removal of Cr(VI).
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden. Electronic address: terrance@kth.se.
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Burks
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden.
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Avila
Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden.
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Akhtar
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden.
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Göthelid
Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden.
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Lansåker
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden.
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Toprak
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden.
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Muhammed
Department of Materials and Nano Physics, Royal Institute of Technology (KTH), 16440 Kista, Stockholm, Sweden. Electronic address: salam@kth.se.
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Uheida
3-Mercaptopropionic acid; Adsorption; Chromium; SPION