期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 6, 页码 6323-6334出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00025
关键词
PEG/SA; Extraction; Fluorescence spectroscopy; Monitor; Photoinduced precipitation
资金
- National Natural Science Foundation of China [21677027]
- NSFC-Xinjiang Unite Funds [U1403194]
- Fundamental Research Funds for the Central Universities [DUT16ZD208]
A novel route based on biohydrogel sodium alginate (SA) for extraction by an aqueous two-phase system (ATPS), recovery of chromium by a photoinduced precipitation process, and monitoring of the process by fluorescence spectroscopy (F-S) was developed. The processes were explored by means of FTIR, micro-FTIR, XPS, and F-S, and the roles of polyethylene glycol and sodium alginate (PEG/SA) in the process were analyzed. Results showed that SA acted as an extractant to form a complex with Cr(VI). The maximum extraction point appeared at pH 5.50, and its kinetic equation showed that C-Cr(VI) was the key point that controls the reaction. Cr(VI) was reduced to Cr(III) within 10 min of 300 W solar irradiation in the presence of PEG. Then coprecipitation of water-insoluble polynuclear complexes consisting of SA and trivalent and hexavalent chromium was completed. The biohydrogel from SA underwent a static quenching process, and the extraction process and phase diagram can be monitored by F-S. It belongs to the transform pi-pi structure from SA. This work may provide a promising and attractive approach to realize a high-rate and low-cost process for recovery of chromium.
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