Synthesis and Application of Organic Phosphonate Salts as Draw Solutes in Forward Osmosis for Oil Water Separation
Synthesis and Application of Organic Phosphonate Salts as Draw Solutes in Forward Osmosis for Oil Water Separation
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DOI：
10.1021/acs.est.6b02953
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发表时间：
2016-11-01
影响因子：
11.4
通讯作者：
Wang, Yan
中科院分区：
文献类型：
--
作者：
Long, Qingwu;Shen, Liang;Wang, Yan
开发合适的正渗透（FO）工艺驱动液已成为水处理领域的研究热点。本研究通过一步类Mannich反应合成了一系列有机膦酸盐（OPSs），并对其进行了红外光谱和核磁共振表征，并将其作为新型驱动溶质应用于FO中。系统地研究了它们的溶液性质，包括渗透压和粘度，以及它们的FO性能作为溶液浓度的函数。在FO工艺中，使用自制的薄膜复合膜（PSF-TFC）和去离子水作为进料溶液，在PRO（AL-DS）模式（活性层面向汲取溶液）中可以实现4754 LMH的较高水通量和可忽略的反向溶质通量。在所有OPS驱动溶质中，四亚乙基五胺七（甲基膦酸）钠盐（TPHMP-Na）在0.5mol/kg浓度下具有最佳的FO通量，并进一步用于乳化油水混合物的分离。通过纳滤（NF）系统回收稀释的OPS溶液，截留率超过92%。上述特征显示OPS化合物作为用于FO应用的新型驱动溶质的巨大潜力。
The development of suitable draw solution in forward osmosis (FO) process has attracted the growing attention for water treatment purpose. In this study, a series of organic phosphonate salts (OPSs) are synthesized by one-step Mannich-like reaction, confirmed by FTIR and NMR characterizations, and applied as novel draw solutes in FO applications. Their solution properties including osmotic pressures and viscosities, as well as their FO performance as a function of the solution concentration are investigated systematically. In FO process, a higher water flux of 4754 LMH and a negligible reverse solute flux can be achieved in the PRO (AL-DS) mode (active layer faces the draw solution) using a homemade thin-film composite membrane (PSF-TFC) and deionized water as the feed solution. Among all OPS draw solutes, the tetraethylenepentamine heptakis(methylphosphonic) sodium salt (TPHMP-Na) exhibits the best FO flux at 0.5 mol/kg concentration, which is further applied for the separation of emulsified oilwater mixture. The recovery of diluted OPS solutions is carried out via a nanofiltration (NF) system with a rejection above 92%. The aforementioned features show the great potential of OPS compounds as a novel class of draw solutes for FO applications.