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Membrane Biofouling Control by Surface Modification of Quaternary Ammonium Compound Using Atom-Transfer Radical-Polymerization Method with Silica Nanoparticle as Interlayer. MEMBRANES 2020; 10:membranes10120417. [PMID: 33322470 PMCID: PMC7764448 DOI: 10.3390/membranes10120417] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/03/2020] [Accepted: 12/10/2020] [Indexed: 11/17/2022]
Abstract
A facile approach to fabricate antibiofouling membrane was developed by grafting quaternary ammonium compounds (QACs) onto polyvinylidene fluoride (PVDF) membrane via surface-initiated activators regenerated by electron transfer atom-transfer radical-polymerization (ARGET ATRP) method. During the modification process, a hydrophilic silica nanoparticle layer was also immobilized onto the membrane surface as an interlayer through silicification reaction for QAC grafting, which imparted the membrane with favorable surface properties (e.g., hydrophilic and negatively charged surface). The QAC-modified membrane (MQ) showed significantly improved hydrophilicity and permeability mainly due to the introduction of silica nanoparticles and exposure of hydrophilic quaternary ammonium groups instead of long alkyl chains. Furthermore, the coverage of QAC onto membrane surface enabled MQ membrane to have clear antibacterial effect, with an inhibition rate ~99.9% of Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive), respectively. According to the batch filtration test, MQ had better antibiofouling performance compared to the control membrane, which was ascribed to enhanced hydrophilicity and antibacterial activity. Furthermore, the MQ membrane also exhibited impressive stability of QAC upon suffering repeated fouling–cleaning tests. The modification protocols provide a new robust way to fabricate high-performance antibiofouling QAC-based membranes for wastewater treatment.
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Liu Y, Fan F, Dull T, Chaparro F, Franz C, Abdalbaqi A, McElroy C, Lannutti J. Physical characterization of electrospun polycaprolactone via laser micrometry: Porosity and condition-dependent jet instabilities. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.123044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Guo C, Shi H, Wang W, Pei X, Teng K, Hu Y, Xu Z, Deng H, Qian X. Improvement of PVDF nanofiltration membrane potential, separation and anti-fouling performance by electret treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137816. [PMID: 32182516 DOI: 10.1016/j.scitotenv.2020.137816] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 02/17/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
Electret treatment was a simple method to enhance the charge-electrode properties of polyvinylidene fluoride (PVDF) materials due to the increase of space charge and polarization charge of PVDF materials. The polarization charge was due to the electric dipole orientation change in loose nanofiltration PVDF membrane, which increased the electric dipole moment and improved the polarity of surface potential. Importantly, electret charges were less affected by ambient humidity. Therefore, the electret treatment could improve the surface negative potential of loose nanofiltration PVDF membrane, so as to improve its anti-fouling performance under certain conditions. Based on the above theoretical analysis, the influence and mechanism of the electret treatment on the surface potential, morphology, structure, hydrophilicity and anti-pollution performance of PVDF membrane were studied in this manuscript. When the electret time was 7.5 min and the electret voltage was 30 kV, the surface negative potential was the highest. The content of β phase crystals was 39.1%, which was 12.18% higher than that of untreated membrane. In addition, the surface morphology of PVDF membrane did not change significantly, but the water contact angle decreased slightly, and the pore size increased by 0.36-0.75 nm. Importantly, the flux and the rejection of dye and BSA increased to some extent, and the maximum rejection rate and water flux were increased by 10.34% and 20.25%, respectively. Through the cyclic filtration test and analysis, the anti-fouling performance of membrane was increased due to electrostatic repulsion.
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Affiliation(s)
- Changsheng Guo
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Haiting Shi
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Wei Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
| | - Xiaoyuan Pei
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Kunyue Teng
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Yanli Hu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Zhiwei Xu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
| | - Hui Deng
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Xiaoming Qian
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
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Electret mechanisms and kinetics of electrospun nanofiber membranes and lifetime in filtration applications in comparison with corona-charged membranes. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.117879] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Lee SB, Min CM, Jang J, Lee JS. Enhanced conductivity and stability of anion exchange membranes depending on chain lengths with crosslinking based on poly(phenylene oxide). POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122331] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Zhou H, Niu H, Wang H, Yang W, Wei X, Shao H, Lin T. A versatile, highly effective nanofibrous separation membrane. NANOSCALE 2020; 12:2359-2365. [PMID: 31960887 DOI: 10.1039/c9nr09776g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although a wide range of fibrous filters are available for diverse filtration tasks to separate solid or oil particles from a gas or liquid medium, a single filter seldom shows versatile separation capability to perform multi-separation tasks to separate both types of particles from different media. Herein, we report a novel nanofibrous membrane that can separate oil/water emulsions (efficiency over 99.9%) at a flux as high as 4082 L m-2 h-1 as well as oil aerosol droplets (efficiency of 99.98% for oil droplets sized ∼330 nm) and solid aerosol particles from air (efficiency 85-99%) and micro-sized solid particles from water (efficiency >95%). The fibrous membrane is reusable to accomplish cross-medium filtration tasks. This versatile, highly efficient separation capability originates from the fine fibrous structure and an amphibious superhydrophilic-superoleophobic surface feature. This may be useful for the development of advanced technologies for various environmental protection applications.
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Affiliation(s)
- Hua Zhou
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia. and Institute of Textile and Clothing, Qingdao University, 266000, China
| | - Haitao Niu
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia. and Collaborative Innovation Center for Eco-Textiles of Shandong Province, Qingdao University, 266000, China
| | - Hongxia Wang
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
| | - Weidong Yang
- Future Manufacturing and Flagship, CSIRO, Clayton South, VIC 3169, Australia
| | - Xin Wei
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
| | - Hao Shao
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
| | - Tong Lin
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
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