Abstract
In forward osmosis (FO), draw solution is a critical problem which restricts the progress and application of FO technology. The study of an optimal draw solution is essential in the application of the FO technology. In this paper, a mild one-pot method was used to synthesize a ferric-lactate (LAFe) complex, which had a good performance of high osmotic pressure, moderate viscosity and high solubility, as a potential draw solute. Then, the properties of the LAFe complex in FO were systematically studied. The water flux was improved to 18.78±1.56Lm−2h−1 (LMH) at 1M LAFe, which was 1.8 times than that of 1M NaCl. And, the reverse salt flux of the 1M LAFe (1.00±0.09gm−2h−1) obviously was diminishing, only 1/4 of the 1M NaCl. Furthermore, in the application test, 1M LAFe exhibited the water flux of 7.54LMH (in the first hour) when the seawater of Huanghai coast was used as the feed solution. The recovery of the LAFe was employed successfully by a nanofiltration method, achieving a high efficiency of 96%.
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