期刊
WATER AIR AND SOIL POLLUTION
卷 228, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/s11270-016-3203-6
关键词
Alginate; Cr(VI); Rutin; Reduction-adsorption microreactor
资金
- Natural Science Foundation of Tianjin, China, [16JCYBJC20700]
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCZDJC40400]
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2014ZX07203-009]
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 reductionadsorption 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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