Manipulating the multifunctionalities of polydopamine to prepare high-flux anti-biofouling composite nanofiltration membranes

Zhang, Runnan; Su, Yanlei; Zhou, Linjie; Zhou, Tiantian; Zhao, Xueting; Li, Yafei; Liu, Yanan; Jiang, Zhongyi

doi:10.1039/c6ra04458a

“…The EDX spectra were used to determine elemental composition of the fabricated membrane and being tabulated in Table 2. Membrane M1 and M2 show similar carbon, sulphur and oxygen content whereby the composition was in agreement with those reported by Zhang et al [7]. No trace elements were found in M1 and M2, indicates that pristine PES membranes were produced.…”

Section: Sem-edxsupporting

confidence: 90%

“…Enlargement of pore size and porosity was believed to be a major factor [4]. In contrast, the coating of PDA caused pore blockage, reduced mean pore radius as well as PWP, similar to those reported in the literature [7]. Immobilization of silver NP on membrane M4 further reduced the PWP to 10.66 LMH/bar as the silver NP aggregates covered up surface and reduced mean pore size [22].…”

Section: Xrdsupporting

confidence: 80%

“…The silver nitrate treatment induced silver NP formation at the PDA surface, blocks pores and further reduces pore size. Besides, silver ions trigger oxidation of residual catechol groups on PDA, where the self-crosslinking reaction between PDA oligomers was initiated and caused the formation of membrane with smaller pore size [7].…”

Section: Xrdmentioning

confidence: 99%

“…With a layer of PDA coating, HA rejection of membrane M3 was improved to 92.4 %. Zhang et al claimed that PDA deposition caused pore blockage and yielded higher rejection [7]. After silver nitrate treatment, the formation of silver NP aggregates on membrane M4 further reduced the pore size and recorded the highest HA rejection at 95 %.…”

Section: Humic Acid Rejectionmentioning

confidence: 99%

“…Polydopamine (PDA), a bio-inspired polymer, is able to reduce fouling caused by oil/water emulsion [5]. In recent years, adopting PDA coating on membrane surface as to improve membrane wettability becomes a new direction in membrane research [6,7]. It was reported that PDA showed a good stability on membrane surface due to strong covalent and non-covalent interactions with the substrate.…”

Section: Introductionmentioning

confidence: 99%

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Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal

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Koo

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Pang

³

et al. 2018

E3S Web Conf.

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Silver nanoparticles (NP) was successfully immobilized on polydopamine (PDA) supported polyethersulfone (PES) membrane via a redox reaction. Polyvinylpyrrolidone (PVP) was added into membrane dope solution as a pore-forming agent. Four pieces of membranes (M1, M2, M3 and M4) were fabricated with different active layer coatings to compare their morphological and performance properties. The differences between each sample were highlighted as follow: M1 (pristine PES), M2 (PES+PVP), M3 (PDA/PES+PVP) and M4 (Ag/PDA/PES+PVP). All membranes were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and contact angle analysis. The membrane performance was examined using pure water permeability (PWP) test, antibacterial test and humic acid (HA) rejection test. Pristine M1 membrane showed that PWP of 27.16 LMH/bar and HA rejection of 84 %. In this study, it was found that the addition of PVP as a pore agent into the membrane M2 increased water flux but slightly deteriorated HA rejection. Coating of PDA on M3 and immobilizing silver NP on M4 membrane surface have improved HA rejection but compromised PWP. The results showed that membrane M4 carried excellent antibacterial property and highest HA rejection among all fabricated membranes.

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Vapor/Vapor‐Solid Interfacial Growth of Covalent Organic Framework Membranes on Alumina Hollow Fiber for Advanced Molecular Separation

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Ong

et al. 2024

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Covalent organic frameworks (COFs), known for their chemical stability and porous crystalline structure, hold promises as advanced separation membranes. However, fabricating high‐quality COF membranes, particularly on industrial‐preferred hollow fiber substrates, remains challenging. This study introduces a novel vapor/vapor‐solid (V/V‐S) method for growing ultrathin crystalline TpPa‐1 COF membranes on the inner lumen surface of alumina hollow fibers (TpPa‐1/Alumina). Through vapor‐phase monomer introduction onto polydopamine‐modified alumina at 170 °C and 1 atm, efficient polymerization and crystallization occur at the confined V‐S interface. This enables one‐step growth within 8 h, producing 100 nm thick COF membranes with strong substrate adhesion. TpPa‐1/Alumina exhibits exceptional stability and performance over 80 h in continuous cross‐flow organic solvent nanofiltration (OSN), with methanol permeance of about 200 L m‐2 h‐1 bar‐1 and dye rejection with molecular weight cutoff (MWCO) of approximately 700 Da. Moreover, the versatile V/V‐S method synthesizes two additional COF membranes (TpPa2Cl/Alumina and TpHz/Alumina) with different pore sizes and chemical environments. Adjusting the COF membrane thickness between 100‐500 nm is achievable easily by varying the growth cycle numbers. Notably, TpPa2Cl/Alumina demonstrates excellent OSN performance in separating the model active pharmaceutical ingredient glycyrrhizic acid (GA) from dimethyl sulfoxide (DMSO), highlighting the method’s potential for large‐scale industrial applications.

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Vapor/Vapor‐Solid Interfacial Growth of Covalent Organic Framework Membranes on Alumina Hollow Fiber for Advanced Molecular Separation

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Ong

et al. 2024

Angew Chem Int Ed

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Covalent organic frameworks (COFs), known for their chemical stability and porous crystalline structure, hold promises as advanced separation membranes. However, fabricating high‐quality COF membranes, particularly on industrial‐preferred hollow fiber substrates, remains challenging. This study introduces a novel vapor/vapor‐solid (V/V‐S) method for growing ultrathin crystalline TpPa‐1 COF membranes on the inner lumen surface of alumina hollow fibers (TpPa‐1/Alumina). Through vapor‐phase monomer introduction onto polydopamine‐modified alumina at 170 °C and 1 atm, efficient polymerization and crystallization occur at the confined V‐S interface. This enables one‐step growth within 8 h, producing 100 nm thick COF membranes with strong substrate adhesion. TpPa‐1/Alumina exhibits exceptional stability and performance over 80 h in continuous cross‐flow organic solvent nanofiltration (OSN), with methanol permeance of about 200 L m‐2 h‐1 bar‐1 and dye rejection with molecular weight cutoff (MWCO) of approximately 700 Da. Moreover, the versatile V/V‐S method synthesizes two additional COF membranes (TpPa2Cl/Alumina and TpHz/Alumina) with different pore sizes and chemical environments. Adjusting the COF membrane thickness between 100‐500 nm is achievable easily by varying the growth cycle numbers. Notably, TpPa2Cl/Alumina demonstrates excellent OSN performance in separating the model active pharmaceutical ingredient glycyrrhizic acid (GA) from dimethyl sulfoxide (DMSO), highlighting the method’s potential for large‐scale industrial applications.

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Manipulating the multifunctionalities of polydopamine to prepare high-flux anti-biofouling composite nanofiltration membranes

Abstract: An anti-biofouling composite NF membrane was prepared through the rational manipulation of the adhesion, reaction and separation functionalities of PDA.

Cited by 28 publications

References 70 publications

Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal

Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal

Vapor/Vapor‐Solid Interfacial Growth of Covalent Organic Framework Membranes on Alumina Hollow Fiber for Advanced Molecular Separation

Vapor/Vapor‐Solid Interfacial Growth of Covalent Organic Framework Membranes on Alumina Hollow Fiber for Advanced Molecular Separation

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