Improved performance of thin-film composite membrane with PVDF/PFSA substrate for forward osmosis process

Zhou, Xuan; Shen, Liang; Lang, Wan‐Zhong; Wang, Yan

doi:10.1016/j.memsci.2017.04.038

Cited by 96 publications

(44 citation statements)

References 63 publications

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“…As is shown in Fig 7(a), the new peaks of 1,658 and 1,543 cm -1 appeared in TFC membranes are ascribed to the amide functional groups. The peak of 1,658 cm -1 is ascribed to the C=O stretching vibrations of amide I and the peak of 1,543 cm -1 is ascribed to C=O in-plane N-H bending and C-N stretching vibrations of amide II, respectively [3], which proves directly the success of forming PA selective layer on top surface of the substrates. The peaks of 1,402, 1,275, 1,180, 876 and 841 cm -1 are ascribed to the characteristic peaks of PVDF.…”

Section: Influences Of Modified Substrates On Pa Selective Layermentioning

confidence: 73%

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Enhanced performance of forward osmosis membranes by incorporating PVDF substrates with hydrophilic nanofillers

Cui¹,

Yan²,

Chen³

et al. 2019

Desalination and Water Treatment

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a b s t r a c tHydrophilic attapulgite (AT) and functional oxidized multi-walled carbon nanotubes (O-MWCNTs) are introduced to the polyvinylidene fluoride (PVDF) substrates to prepare improved performance of thin-film composite (TFC) membranes for forward osmosis (FO) process. The improved hydrophilicity of substrates can make for forming free-defect polyamide (PA) layer and enhance the permeability performance of the as-prepared TFC membranes. The effects of the single or composite addition of two nanofillers on the hydrophilicity, membrane morphology, porosity and mechanical strength of as-prepared substrates are investigated in detail. The results show that hydrophilic, porous and high-flux substrates are prepared and the corresponding TFC membranes own improved water flux and better selectivity. In a word, the PVDF/AT/O-MWCNTs TFC membrane receives a better water flux (J v ) of 28.23 and 20.37 L.m -2 .h -1 and a lower reverse salt flux (J s ) of 9.5 and 6.5 g.m -2 .h -1 in pressure-retarded osmosis (PRO) mode (active layer facing draw solution, AL-DS) and FO mode (active layer facing feed solution, AL-FS). The draw solution and feed solution are 2M NaCl aqueous solution and deionized (DI) water, respectively. This study develops a brand-new way for preparing substrate for FO process.

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Section: Influences Of Modified Substrates On Pa Selective Layermentioning

confidence: 73%

“…Nowadays, the water shortage seriously threatens the survival of human beings' living and development of economy [1][2][3]. Lately, forward osmosis (FO) process works with lower external pressure while the reverse osmosis (RO) process is widely used to produce pure water as an advanced and energy-saving technology [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced performance of forward osmosis membranes by incorporating PVDF substrates with hydrophilic nanofillers

Cui¹,

Yan²,

Chen³

et al. 2019

Desalination and Water Treatment

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“…Yet the rejection was almost equivalent to that of CTA. In the former case, the structural configuration can be altered accordingly, where microporous support material [37][38][39][40] can be changed to enhance permeability, and the selective PA layer can be tuned to cater to the end application. Usually, the support layer is fabricated using none solvent-induced phase separation and the selective layer of PA via interfacial polymerization (IP).…”

Section: Fundamentals Of the Fo Separationmentioning

confidence: 99%

“…Polymeric membranes are commonly used in the industrial processes as supporting layers for FO membranes such as cellulose, cellulose triacetate [37], polysulfone (PSF) [38], polyethersulfone (PES) [39], and polyvinylidene fluoride (PVDF) [40]. Recently, ceramic and sintered metal-based membranes were also studied in industries [41].…”

Section: Fundamentals Of the Fo Separationmentioning

confidence: 99%

Organic Fouling in Forward Osmosis: A Comprehensive Review

Yadav

Ibrar

Bakly

et al. 2020

Water

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Organic fouling in the forward osmosis process is complex and influenced by different parameters in the forward osmosis such as type of feed and draw solution, operating conditions, and type of membrane. In this article, we reviewed organic fouling in the forward osmosis by focusing on wastewater treatment applications. Model organic foulants used in the forward osmosis literature were highlighted, which were followed by the characteristics of organic foulants when real wastewater was used as feed solution. The various physical and chemical cleaning protocols for the organic fouled membrane are also discussed. The study also highlighted the effective pre-treatment strategies that are effective in reducing the impact of organic fouling on the forward osmosis (FO) membrane. The efficiency of cleaning methods for the removal of organic fouling in the FO process was investigated, including recommendations on future cleaning technologies such as Ultraviolet and Ultrasound. Generally, a combination of physical and chemical cleaning is the best for restoring the water flux in the FO process.

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“…Compared to pristine membrane, the water permeability, salt rejection and salt permeability were 0.5 LMH 91%, and 0.041 respectively.Researchers showed different results when a PFSA introduced into PVDF sub-layer. The result indicated that a thinner and straighter finger-like structure could reduce the membrane tortuosity[158]. It was explained that the presence of -SO3 groups in PFSA facilitated the mass diffusion of the N-Methyl-2-pyrrolidone (NMP) solvent in the matrix with the water in the coagulation bath, which promoted the phase separation.…”

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confidence: 99%

Advances in forward osmosis membranes: Altering the sub-layer structure via recent fabrication and chemical modification approaches

et al. 2018

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The forward osmosis process has obtained renewed interest nowadays and it might become an alternative solution for many industrial applications to meet the current and future requirements for potable water. The FO process depends on the osmotic pressure gradient between a high salinity draw solute and low salinity feed solution across a semi-permeable membrane to extract pure water. Despite the potential advantages of FO, there are some technical drawbacks that hinder FO application for water desalination. One of the most significant critical challenges is the need for membrane compatible with the FO process. To improve FO desalination feasibility, membrane development is required to obtain maximum water permeability and minimum Highlights  Comprehensive overview of commercial FO membranes and modified FO sub-layers.  Discussion of fundamental and practical challenges of FO membrane performance.  Chemical modification strategies to minimize the structural parameter of FO sub-layer.

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Improved performance of thin-film composite membrane with PVDF/PFSA substrate for forward osmosis process

Cited by 96 publications

References 63 publications

Enhanced performance of forward osmosis membranes by incorporating PVDF substrates with hydrophilic nanofillers

Enhanced performance of forward osmosis membranes by incorporating PVDF substrates with hydrophilic nanofillers

Organic Fouling in Forward Osmosis: A Comprehensive Review

Advances in forward osmosis membranes: Altering the sub-layer structure via recent fabrication and chemical modification approaches

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