Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 285, Issue -, Pages 336-345Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.12.008
Keywords
Rutin; Flavonoid-metal complex; Rutin-Cr(III); Alginate-chitosan microcapsule; Cr(VI) reduction
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Funding
- National Natural Science Foundation of China [51108310]
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2014ZX07203-009]
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The harmfulness of carcinogenic hexavalent chromium (Cr(VI)) is dramatically decreased when Cr(VI) is reduced to trivalent chromium (Cr(III)). Rutin, a natural flavonoid, exhibits excellent antioxidant activity by coordinating metal ions. In this study, a complex containing rutin and Cr(III)(rutin-Cr(III)) was synthesized and characterized. The rutin-Cr(III) complex was much easier to reduce than rutin. The reduction of the rutin-Cr(III) complex was highly pH-dependent, with 90% of the Cr(VI) being reduced to Cr(III) in 2 h under optimal conditions. A biodegradable, sustained-release system encapsulating the rutin-Cr(III) complex in a alginate-chitosan microcapsule (rutin-Cr(III) ACMS) was also evaluated, and the reduction of Cr(VI) was assessed. This study also demonstrated that low-pH solutions increased the reduction rate of Cr(VI). The environmentally friendly microcapsules can reduce Cr(VI) for prolonged periods of time and can easily biodegrade after releasing the rutin-Cr(III) complex. Given the excellent performance of rutin-Cr(III)ACMS, the microcapsule system represents an effective system for the remediation of Cr(VI) pollution. (C) 2014 Elsevier B.V. All rights reserved.
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