New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes

Rodolfo Cruz-Silva, Yoshihiro Takizawa, Auppatham Nakaruk, Michio Katouda, Ayaka Yamanaka, Josue Ortiz-Medina, Aaron Morelos-Gomez, Syogo Tejima, Michiko Obata, Kenji Takeuchi, Toru Noguchi, Takuya Hayashi, Mauricio Terrones Maldonado, Morinobu Endo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Polyamide (PA) membranes comprise most of the reverse osmosis membranes currently used for desalination and water purification. However, their fouling mechanisms with natural organic matter (NOM) is still not completely understood. In this work, we studied three different types of PA membranes: a laboratory made PA, a commercial PA, and a multiwalled carbon nanotube (CNT-PA nanocomposite membrane during cross-flow measurements by NaCl solutions including NOM, humic acid (HA), or alginate, respectively). Molecular dynamic simulations were also used to understand the fouling process of NOM down to its molecular scale. Low molecular weight humic acid binds to the surface cavities on the PA structures that leads to irreversible adsorption induced by the high surface roughness. In addition, the larger alginate molecules show a different mechanism, due to their larger size and their ability to change shape from the globule type to the uncoiled state. Specifically, alginate molecules either bind through Ca2+ bridges or they uncoil and spread on the surface. This work shows that carbon nanotubes can help to decrease roughness and polymer mobility on the surfaces of the membranes at the molecular scale, which represents a novel method to design antifouling membranes.

Original languageEnglish (US)
Pages (from-to)6255-6263
Number of pages9
JournalEnvironmental Science and Technology
Volume53
Issue number11
DOIs
StatePublished - Jun 4 2019

Fingerprint

Multiwalled carbon nanotubes (MWCN)
Nylons
Fouling
fouling
Biological materials
Nanocomposites
membrane
Membranes
organic matter
alginate
Humic Substances
humic acid
Surface roughness
Osmosis membranes
Carbon Nanotubes
Molecules
antifouling
flow measurement
Reverse osmosis
Flow measurement

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Cruz-Silva, Rodolfo ; Takizawa, Yoshihiro ; Nakaruk, Auppatham ; Katouda, Michio ; Yamanaka, Ayaka ; Ortiz-Medina, Josue ; Morelos-Gomez, Aaron ; Tejima, Syogo ; Obata, Michiko ; Takeuchi, Kenji ; Noguchi, Toru ; Hayashi, Takuya ; Terrones Maldonado, Mauricio ; Endo, Morinobu. / New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes. In: Environmental Science and Technology. 2019 ; Vol. 53, No. 11. pp. 6255-6263.
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abstract = "Polyamide (PA) membranes comprise most of the reverse osmosis membranes currently used for desalination and water purification. However, their fouling mechanisms with natural organic matter (NOM) is still not completely understood. In this work, we studied three different types of PA membranes: a laboratory made PA, a commercial PA, and a multiwalled carbon nanotube (CNT-PA nanocomposite membrane during cross-flow measurements by NaCl solutions including NOM, humic acid (HA), or alginate, respectively). Molecular dynamic simulations were also used to understand the fouling process of NOM down to its molecular scale. Low molecular weight humic acid binds to the surface cavities on the PA structures that leads to irreversible adsorption induced by the high surface roughness. In addition, the larger alginate molecules show a different mechanism, due to their larger size and their ability to change shape from the globule type to the uncoiled state. Specifically, alginate molecules either bind through Ca2+ bridges or they uncoil and spread on the surface. This work shows that carbon nanotubes can help to decrease roughness and polymer mobility on the surfaces of the membranes at the molecular scale, which represents a novel method to design antifouling membranes.",
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Cruz-Silva, R, Takizawa, Y, Nakaruk, A, Katouda, M, Yamanaka, A, Ortiz-Medina, J, Morelos-Gomez, A, Tejima, S, Obata, M, Takeuchi, K, Noguchi, T, Hayashi, T, Terrones Maldonado, M & Endo, M 2019, 'New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes', Environmental Science and Technology, vol. 53, no. 11, pp. 6255-6263. https://doi.org/10.1021/acs.est.8b07203

New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes. / Cruz-Silva, Rodolfo; Takizawa, Yoshihiro; Nakaruk, Auppatham; Katouda, Michio; Yamanaka, Ayaka; Ortiz-Medina, Josue; Morelos-Gomez, Aaron; Tejima, Syogo; Obata, Michiko; Takeuchi, Kenji; Noguchi, Toru; Hayashi, Takuya; Terrones Maldonado, Mauricio; Endo, Morinobu.

In: Environmental Science and Technology, Vol. 53, No. 11, 04.06.2019, p. 6255-6263.

Research output: Contribution to journalArticle

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T1 - New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes

AU - Cruz-Silva, Rodolfo

AU - Takizawa, Yoshihiro

AU - Nakaruk, Auppatham

AU - Katouda, Michio

AU - Yamanaka, Ayaka

AU - Ortiz-Medina, Josue

AU - Morelos-Gomez, Aaron

AU - Tejima, Syogo

AU - Obata, Michiko

AU - Takeuchi, Kenji

AU - Noguchi, Toru

AU - Hayashi, Takuya

AU - Terrones Maldonado, Mauricio

AU - Endo, Morinobu

PY - 2019/6/4

Y1 - 2019/6/4

N2 - Polyamide (PA) membranes comprise most of the reverse osmosis membranes currently used for desalination and water purification. However, their fouling mechanisms with natural organic matter (NOM) is still not completely understood. In this work, we studied three different types of PA membranes: a laboratory made PA, a commercial PA, and a multiwalled carbon nanotube (CNT-PA nanocomposite membrane during cross-flow measurements by NaCl solutions including NOM, humic acid (HA), or alginate, respectively). Molecular dynamic simulations were also used to understand the fouling process of NOM down to its molecular scale. Low molecular weight humic acid binds to the surface cavities on the PA structures that leads to irreversible adsorption induced by the high surface roughness. In addition, the larger alginate molecules show a different mechanism, due to their larger size and their ability to change shape from the globule type to the uncoiled state. Specifically, alginate molecules either bind through Ca2+ bridges or they uncoil and spread on the surface. This work shows that carbon nanotubes can help to decrease roughness and polymer mobility on the surfaces of the membranes at the molecular scale, which represents a novel method to design antifouling membranes.

AB - Polyamide (PA) membranes comprise most of the reverse osmosis membranes currently used for desalination and water purification. However, their fouling mechanisms with natural organic matter (NOM) is still not completely understood. In this work, we studied three different types of PA membranes: a laboratory made PA, a commercial PA, and a multiwalled carbon nanotube (CNT-PA nanocomposite membrane during cross-flow measurements by NaCl solutions including NOM, humic acid (HA), or alginate, respectively). Molecular dynamic simulations were also used to understand the fouling process of NOM down to its molecular scale. Low molecular weight humic acid binds to the surface cavities on the PA structures that leads to irreversible adsorption induced by the high surface roughness. In addition, the larger alginate molecules show a different mechanism, due to their larger size and their ability to change shape from the globule type to the uncoiled state. Specifically, alginate molecules either bind through Ca2+ bridges or they uncoil and spread on the surface. This work shows that carbon nanotubes can help to decrease roughness and polymer mobility on the surfaces of the membranes at the molecular scale, which represents a novel method to design antifouling membranes.

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