Synthesis and Application of Organic Phosphonate Salts as Draw Solutes in Forward Osmosis for Oil-Water Separation.
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 47-54 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 oil-water 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.
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.|School of Chemistry and Chemical Engineering, Lingnan Normal University , Zhanjiang 524048, P.R. China.
Qingwu
Q
Long
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.|Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology , Wuhan, 430074, P.R. China.
Liang
L
Shen
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.
Rongbiao
R
Chen
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.|Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology , Wuhan, 430074, P.R. China.
Jiaqi
J
Huang
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.|Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology , Wuhan, 430074, P.R. China.
Shu
S
Xiong
Key Laboratory of Material Chemistry for Energy Conversion and Storage, (Huazhong University of Science and Technology), Ministry of Education , Wuhan, 430074, P.R. China.|Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology , Wuhan, 430074, P.R. China.
Yan
Y
Wang
D008567:Membranes, Artificial; D063065:Organophosphonates / Q000138:chemical synthesis / Q000737:chemistry; D009995:Osmosis; D012492:Salts / Q000138:chemical synthesis / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D018508:Water Purification
D008567:Membranes, Artificial; D063065:Organophosphonates; D012492:Salts; D012996:Solutions