High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO2 nanoparticles

doi:10.1016/j.cjche.2020.08.026

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (12): 3152-3158.DOI: 10.1016/j.cjche.2020.08.026

• Materials and Product Engineering • Previous Articles Next Articles

High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles

Qi Zhang^1,2, Zhaoliang Cui^1,2, Weixing Li^1,2

1 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2 National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China

Received:2020-04-08 Revised:2020-08-04 Online:2021-01-11 Published:2020-12-28
Contact: Zhaoliang Cui, Weixing Li
Supported by:
The authors wish to acknowledge the financial support from National Key R&D Program of China (2017YFD0400402), National Natural Science Foundation of China (No. 21576132).

High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles

Qi Zhang^1,2, Zhaoliang Cui^1,2, Weixing Li^1,2

1 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2 National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China

通讯作者: Zhaoliang Cui, Weixing Li
基金资助:
The authors wish to acknowledge the financial support from National Key R&D Program of China (2017YFD0400402), National Natural Science Foundation of China (No. 21576132).

Abstract

Abstract: In order to improve the water permeability of poly(vinylidene fluoride) (PVDF) ultrafiltration (UF) membranes with low molecular weight cut-off (MWCO), polydopamine (PDA) was employed in the membrane preparation process. Owing to its merits of material-independent adhesion, PDA was coated on inorganic particles or added in coagulation bath to tailor the final membrane structure and property. The introduction of PDA broke through the permeability/selectivity trade-off of the PVDF membrane. By adding the PDA coated titanium dioxide (PDA/TiO₂) nanoparticles, water flux increased by 287% while MWCO kept similar with the pristine PVDF membrane. Thermodynamics and Kinetics of the PVDF/additives/non-solvent were analyzed and shown that nanoparticles reduced the thermodynamic stability and increased the phase separation speed, and the speed can be adjusted using different nanoparticles. Additionally, X-ray diffraction (XRD) test indicated that PVDF crystalline form changed from α phase to β phase after adding different nanoparticles. Permeability/selectivity trade-off was broken through by DA addition in coagulation bath. Compared with the original PVDF membrane, when the DA concentration of the coagulation bath was 2.0 g·L^-1, water flux increased by 312%, and MWCO of the PVDF membrane ranged in 10,000 to 20,000 Da as well as contact angle decreased from 81.4° to 45°.

Key words: Poly(vinylidene fluoride) membrane, Polydopamine, Permeability/selectivity trade-off

摘要： In order to improve the water permeability of poly(vinylidene fluoride) (PVDF) ultrafiltration (UF) membranes with low molecular weight cut-off (MWCO), polydopamine (PDA) was employed in the membrane preparation process. Owing to its merits of material-independent adhesion, PDA was coated on inorganic particles or added in coagulation bath to tailor the final membrane structure and property. The introduction of PDA broke through the permeability/selectivity trade-off of the PVDF membrane. By adding the PDA coated titanium dioxide (PDA/TiO₂) nanoparticles, water flux increased by 287% while MWCO kept similar with the pristine PVDF membrane. Thermodynamics and Kinetics of the PVDF/additives/non-solvent were analyzed and shown that nanoparticles reduced the thermodynamic stability and increased the phase separation speed, and the speed can be adjusted using different nanoparticles. Additionally, X-ray diffraction (XRD) test indicated that PVDF crystalline form changed from α phase to β phase after adding different nanoparticles. Permeability/selectivity trade-off was broken through by DA addition in coagulation bath. Compared with the original PVDF membrane, when the DA concentration of the coagulation bath was 2.0 g·L^-1, water flux increased by 312%, and MWCO of the PVDF membrane ranged in 10,000 to 20,000 Da as well as contact angle decreased from 81.4° to 45°.

关键词: Poly(vinylidene fluoride) membrane, Polydopamine, Permeability/selectivity trade-off

Qi Zhang, Zhaoliang Cui, Weixing Li. High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles[J]. Chinese Journal of Chemical Engineering, 2020, 28(12): 3152-3158.

Qi Zhang, Zhaoliang Cui, Weixing Li. High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles[J]. 中国化学工程学报, 2020, 28(12): 3152-3158.

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High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles

High permeability poly(vinylidene fluoride) ultrafiltration membrane doped with polydopamine modified TiO₂ nanoparticles

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