An innovative strategy for improving the performance of forward osmosis membrane: stripe-like Turing structure construct
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An innovative strategy for improving the performance of forward osmosis membrane: stripe-like Turing structure constructed by introducing hydrophilic polyvinylpyrrolidone Siqi Zhang1, Shejiang Liu2, Hui Ding2,* Jianfeng Fu2
, Huizhen Zhu1, Dan Zhao2, Mengling Zhang3, and
1
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China 3 Huadian Aqua Membrane Separation Technology (Tianjin) Co. Ltd., Tianjin 301700, China 2
Received: 4 March 2020
ABSTRACT
Accepted: 21 August 2020
Improving the performance of forward osmosis (FO) membranes has always been moving forward. Here we fabricate the novel Turing structures in the active layer (AL) of thin film composite (TFC) membrane through effectively introducing the polyvinylpyrrolidone (PVP) macromolecule with hydrophilicity both in the support layer (SL) and AL. The addition of PVP facilitates the formation of sponge-like pores in the SL and stripe-like Turing structures in the AL. The influence of PVP on the morphology and performance of the membranes was investigated by SEM, AFM, XPS, NMR, FTIR. Compared with the water flux (Jw) of the original composite membrane (approximately 25 L m-2 h-1), TFC-PVP (3:1) membrane with Turing structure achieved better performance (approximately 75 L m-2 h-1), and the reverse solute flux/water flux (Js/Jw) value was as low as 0.02 g/L. This study demonstrated that the Turing structures have a favorable effect on the performance of FO membrane and a promisingly practical application in water treatment.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Maude Jimenez.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05151-y
J Mater Sci
GRAPHIC ABSTRACT
Introduction Energy scarcity and the increasing demand for pure water are great challenges to our social development [1, 2]. In recent years, various membrane technologies have been investigated for responding to such crises [3–6]. The forward osmosis (FO) process has received extensive attention owing to its inherent characteristics of low energy consumption, low pollution, and low cost compared to pressure-driven membrane separation technology [7–9]. The thin film composite (TFC) membrane, which is a great breakthrough in the current FO market, consists of a porous support layer (SL) and active layer (AL) with separation characteristics [10]. Generally, the water flux (Jw) is mainly affected by the thickness, tortuosity, and porosity of the support layer [11, 12], while the reverse solute flux (Js) is controlled by the properties of the active layer [13, 14]. Most research on optimizing the SL has mainly focused on two aspects: (1) modifying the SL by directly blending different nanoparticles; (2) investigating new support layer materials. The direct modification of the SL material is the main research direction toward enhancing the hydrophilicity, increasing the porosity, and ach
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