Abstract
A rutin-Cr(III) loaded alginate microspheres, which can act as reduction-adsorption microreactor, was designed to reduce Cr(VI) to Cr(III) and recover it. Different from the rutin-Cr(III) complex in alginate-chitosan microcapsule we previously reported, which can sustained release rutin-Cr(III) and reduce Cr(VI) to Cr(III), this microreactor can not only reduce Cr(VI) but also adsorb/recover Cr(III) in aqueous solution. This microreactor was prepared by loading metal complex of rutin into alginate microsphere. It was found that Cr(VI) was initially reduced to Cr(III) by rutin-Cr(III), and then the product Cr(III) was absorbed in the microspheres. Both Cr(VI) reduction rate and Cr(III) adsorption rate were pH-dependent. Cr(VI) can be completely reduced to Cr(III) at pH 1–4 with a reduction capability of 1.27 (±0.078) mmol/g (pH 1, 4 h). The highest blank alginate microsphere adsorption capacity was 1.82 (±0.042) mmol/g at pH 4. It was assumed that reduction-adsorption was the mechanism of total Cr removal by the reduction-absorption microreactor. Recovery experiment showed that 93% and 98% of Cr(III) can be recovered by EDTA and sodium citrate, respectively.
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Acknowledgements
The authors gratefully acknowledge financial support from the Natural Science Foundation of Tianjin, China, (16JCYBJC20700), Tianjin Research Program of Application Foundation and Advanced Technology (15JCZDJC40400), and Major Science and Technology Program for Water Pollution Control and Treatment of China (2014ZX07203-009).
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Jiang, M., Qi, Y., Cui, YL. et al. Removal and Recovery of Chromium from Aqueous Solutions by Reduction-Absorption Microreactor. Water Air Soil Pollut 228, 26 (2017). https://doi.org/10.1007/s11270-016-3203-6
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DOI: https://doi.org/10.1007/s11270-016-3203-6