Performance evaluation of polyamide TFC membranes: Effects of free volume properties on boron transport

Sung Jo Kim; Doseon Han; Hye Weon Yu; Brian E. O'Rourke; Yoshinori Kobayashi; Ryoichi Suzuki; Moonhyun Hwang; In S. Kim

doi:10.1016/j.desal.2017.12.042

Performance evaluation of polyamide TFC membranes: Effects of free volume properties on boron transport

Sung Jo Kim, Doseon Han, Hye Weon Yu, Brian E. O'Rourke, Yoshinori Kobayashi, Ryoichi Suzuki, Moonhyun Hwang, In S. Kim

* New professors

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

To comprehensively investigate the correlation between free volume properties (size and distribution) in the interior of polyamide (PA) active layer and mass transport mechanism, six polyamide thin film composite (TFC) membranes were characterized using positron annihilation lifetime spectroscopy (PALS). In case of pressurized filtration conditions, the rejection rate of boron across all PA membranes was found to be inversely proportional to the free volume size. The more boron transport occurred at the membrane containing larger free volume. In addition, the transition of the neutral boron transport mechanism from convection to diffusion was found to occur at a membrane free volume radius around 0.275 nm within the applied pressure range (2 and 10 bar), as verified by PALS and the dimensionless Peclet number. We believe that mass transport mechanism transition from convection to diffusion is caused by the compression of polyamide active layer due to applied hydraulic pressure (10 bar), resulting in lowering the convective mass transport pathway inside polyamide active layer. These membrane free volume size criteria and experimental filtration results may subsequently be used as new design guidelines for the development of high boron rejection polyamide TFC membranes having a low energy consumption.

Original language	English
Pages (from-to)	104-114
Number of pages	11
Journal	Desalination
Volume	432
DOIs	https://doi.org/10.1016/j.desal.2017.12.042
Publication status	Published - 2018 Apr 15

Keywords

Boron transport
Free volume
Membrane pore
Polyamide active layer
Positron annihilation lifetime spectroscopy (PALS)

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)
Water Science and Technology
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.desal.2017.12.042

Cite this

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title = "Performance evaluation of polyamide TFC membranes: Effects of free volume properties on boron transport",

abstract = "To comprehensively investigate the correlation between free volume properties (size and distribution) in the interior of polyamide (PA) active layer and mass transport mechanism, six polyamide thin film composite (TFC) membranes were characterized using positron annihilation lifetime spectroscopy (PALS). In case of pressurized filtration conditions, the rejection rate of boron across all PA membranes was found to be inversely proportional to the free volume size. The more boron transport occurred at the membrane containing larger free volume. In addition, the transition of the neutral boron transport mechanism from convection to diffusion was found to occur at a membrane free volume radius around 0.275 nm within the applied pressure range (2 and 10 bar), as verified by PALS and the dimensionless Peclet number. We believe that mass transport mechanism transition from convection to diffusion is caused by the compression of polyamide active layer due to applied hydraulic pressure (10 bar), resulting in lowering the convective mass transport pathway inside polyamide active layer. These membrane free volume size criteria and experimental filtration results may subsequently be used as new design guidelines for the development of high boron rejection polyamide TFC membranes having a low energy consumption.",

keywords = "Boron transport, Free volume, Membrane pore, Polyamide active layer, Positron annihilation lifetime spectroscopy (PALS)",

author = "Kim, {Sung Jo} and Doseon Han and Yu, {Hye Weon} and O'Rourke, {Brian E.} and Yoshinori Kobayashi and Ryoichi Suzuki and Moonhyun Hwang and Kim, {In S.}",

note = "Funding Information: This research was supported by grants ( 18IFIP-B089914-05 ) from the Plant Technology Advancement Program funded by the Ministry of Land, Transport, and Maritime Affairs of the Korean government . The authors would also like to acknowledge Prof. Jaeweon Cho at Ulsan National Institute of Science and Technology (UNIST) for the support of polyamide membranes and Dr. Yun Chul Woo in University of Technology Sydney for the support of tensile strength measurements. Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

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doi = "10.1016/j.desal.2017.12.042",

language = "English",

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journal = "Desalination",

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T2 - Effects of free volume properties on boron transport

AU - Kim, Sung Jo

AU - Han, Doseon

AU - Yu, Hye Weon

AU - O'Rourke, Brian E.

AU - Kobayashi, Yoshinori

AU - Suzuki, Ryoichi

AU - Hwang, Moonhyun

AU - Kim, In S.

N1 - Funding Information: This research was supported by grants ( 18IFIP-B089914-05 ) from the Plant Technology Advancement Program funded by the Ministry of Land, Transport, and Maritime Affairs of the Korean government . The authors would also like to acknowledge Prof. Jaeweon Cho at Ulsan National Institute of Science and Technology (UNIST) for the support of polyamide membranes and Dr. Yun Chul Woo in University of Technology Sydney for the support of tensile strength measurements. Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/4/15

Y1 - 2018/4/15

N2 - To comprehensively investigate the correlation between free volume properties (size and distribution) in the interior of polyamide (PA) active layer and mass transport mechanism, six polyamide thin film composite (TFC) membranes were characterized using positron annihilation lifetime spectroscopy (PALS). In case of pressurized filtration conditions, the rejection rate of boron across all PA membranes was found to be inversely proportional to the free volume size. The more boron transport occurred at the membrane containing larger free volume. In addition, the transition of the neutral boron transport mechanism from convection to diffusion was found to occur at a membrane free volume radius around 0.275 nm within the applied pressure range (2 and 10 bar), as verified by PALS and the dimensionless Peclet number. We believe that mass transport mechanism transition from convection to diffusion is caused by the compression of polyamide active layer due to applied hydraulic pressure (10 bar), resulting in lowering the convective mass transport pathway inside polyamide active layer. These membrane free volume size criteria and experimental filtration results may subsequently be used as new design guidelines for the development of high boron rejection polyamide TFC membranes having a low energy consumption.

AB - To comprehensively investigate the correlation between free volume properties (size and distribution) in the interior of polyamide (PA) active layer and mass transport mechanism, six polyamide thin film composite (TFC) membranes were characterized using positron annihilation lifetime spectroscopy (PALS). In case of pressurized filtration conditions, the rejection rate of boron across all PA membranes was found to be inversely proportional to the free volume size. The more boron transport occurred at the membrane containing larger free volume. In addition, the transition of the neutral boron transport mechanism from convection to diffusion was found to occur at a membrane free volume radius around 0.275 nm within the applied pressure range (2 and 10 bar), as verified by PALS and the dimensionless Peclet number. We believe that mass transport mechanism transition from convection to diffusion is caused by the compression of polyamide active layer due to applied hydraulic pressure (10 bar), resulting in lowering the convective mass transport pathway inside polyamide active layer. These membrane free volume size criteria and experimental filtration results may subsequently be used as new design guidelines for the development of high boron rejection polyamide TFC membranes having a low energy consumption.

KW - Boron transport

KW - Free volume

KW - Membrane pore

KW - Polyamide active layer

KW - Positron annihilation lifetime spectroscopy (PALS)

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DO - 10.1016/j.desal.2017.12.042

M3 - Article

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SN - 0011-9164

VL - 432

SP - 104

EP - 114

JO - Desalination

JF - Desalination

ER -

Performance evaluation of polyamide TFC membranes: Effects of free volume properties on boron transport

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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