Abstract
The incorporation of inorganic nanoparticles into thin film composite forward osmosis (TFC FO) membranes is an effective method to alleviate internal concentration polarization (ICP) and enhance the flux performance of the FO membrane. In this paper, synthetic hydrophilic rod-like porous nano-hydroxyapatites (PNHAs) were doped into polysulfone (PSf) casting solution to form support layer by phase inversion; further interfacial polymerization was carried out to prepare a high performance TFC FO membrane. The results showed that the incorporation of PNHAs not only improved the thickness, porosity, hydrophilicity, and connectivity of the support layer, but also enhanced the roughness of the active layer. The measured mass transfer parameters prove that these improvements were beneficial. Further FO experiments showed that when using deionized water as the feed solution and 1mol/L NaCl as the draw solution, TFN 0.75 showed higher water flux than TFC FO membrane in both AL-FS (18.5 vs 7.16 L/m2·h) and AL-DS (33.26 vs 9.93 L/m2·h) modes. Reverse salt flux had not increased significantly. At the same time, TFN 0.75 (697 μm vs 1,960 μm) showed the smallest structural parameter. This study shows that PNHA is a suitable nanomaterial for mitigating the ICP effect of FO membranes.
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Abbreviations
- Ai :
-
water permeability coefficient, i representing total membrane (T) or substrate (S), respectively [L/m2·h·bar]
- Am :
-
effective membrane area [m2]
- Bi :
-
salt permeability coefficient [L/m2·h]
- Cf :
-
salt concentration of feed solution [mol/L]
- Cp :
-
salt concentration of permeated side solution [mol/L]
- Ct :
-
salt concentration in feed solution at different times [mol/L]
- D:
-
solute diffusion coefficient [m2/s]
- J:
-
pure water flux [L/m2·h]
- Js :
-
reverse salt flux [g/m2·h]
- Jw :
-
water flux [L/m2·h]
- mdry :
-
weight of dry substrate [g]
- mwet :
-
weight of wet substrate [g]
- Ri :
-
salt rejection [%]
- S:
-
structural parameter [μm]
- Vt :
-
volume of feed solution at different times [mol/L]
- ε :
-
porosity of substrate [%]
- ρ w :
-
density of water [g/cm3]
- ρ P :
-
density of PSf [g/cm3]
- π D, b :
-
bulk osmosis pressure of DS [bar]
- π F,m :
-
osmosis pressure of FS on the FO membrane surface [bar]
- ΔP:
-
transmembrane pressure [bar]
- ΔV:
-
increment of water permeation volume [L]
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21276132) and the Key Research and Development Program in Shandong Province (public welfare science and technology research project) (2019GSF109038).
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Porous nano-hydroxyapatites doped into substrate for thin film composite forward osmosis membrane to show high performance
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Wang, W., Guo, Y., Liu, M. et al. Porous nano-hydroxyapatites doped into substrate for thin film composite forward osmosis membrane to show high performance. Korean J. Chem. Eng. 37, 1573–1584 (2020). https://doi.org/10.1007/s11814-020-0554-x
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DOI: https://doi.org/10.1007/s11814-020-0554-x