Optimized anti-biofouling performance of bactericides/cellulose nanocrystals composites modified PVDF ultrafiltration membrane for micro-polluted source water purification

2019 ◽  
Vol 79 (8) ◽  
pp. 1437-1446 ◽  
Author(s):  
Guoquan Zhang ◽  
Jinling Lv ◽  
Fenglin Yang
Keyword(s):  
Water Purification ◽  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Source Water ◽  
Hybrid Membranes ◽  
Ultrafiltration Membranes ◽  
Entire Cross Section ◽  
Dimethyl Benzyl ◽  
One Step ◽  
Dimethyl Benzyl Ammonium

Abstract The covalently functionalized cellulose nanocrystal (CNC) composites were synthesized by bonding common bactericides, such as dodecyl dimethyl benzyl ammonium chloride (DDBAC), ZnO and graphene oxide (GO) nanosheets, onto the CNC's surface. Then, the DDBAC/CNC, ZnO/CNC and GO/CNC nanocomposites modified polyvinylidene fluoride (PVDF) ultrafiltration membranes were fabricated by a simple one-step non-solvent induced phase separation (NIPS) process. The resultant hybrid membranes possessed porous and rough surfaces with more finger-like macropores that even extended through the entire cross-section. The hydrophilicity, permeability, antibacterial and antifouling performance and mechanism of the hybrid ultrafiltration membranes were evaluated and compared in detail, aiming at screening a superior hybrid membrane for practical application in micro-polluted source water purification. Among these newly-developed hybrid membranes, GO/CNC/PVDF exhibited an enhanced perm-selectivity with a water flux of 230 L/(m2 h bar) and humic acid rejection of 92%, the improved antibacterial activity (bacteriostasis rate of 93%) and antifouling performance (flux recovery rate (FRR) of >90%) being due to the optimized pore structure, higher surface roughness, incremental hydrophilicity and electronegativity. A lower biofouling level after three weeks' filtration of the actual micro-polluted source water further demonstrated that embedding the hydrophilic and antibacterial GO/CNC nanocomposite into the polymer matrix is an effective strategy to improve membrane anti-biofouling ability.

Novel Nanoparticles Incorporated Polyvinylidene Fluoride Ultrafiltration Membrane

2013 ◽  
Vol 746 ◽  
pp. 390-393
Author(s):  
Qiong Zhi Gao ◽  
Hong Qiang Li ◽  
Xing Rong Zeng
Keyword(s):  
Polyvinylidene Fluoride ◽  
Phase Inversion ◽  
Water Flux ◽  
Silver Ions ◽  
Inversion Method ◽  
Hybrid Films ◽  
Ultrafiltration Membranes ◽  
Pvdf Membrane ◽  
Basic Performance ◽  
Phase Inversion Method

In this study, polyvinylidene fluoride (PVDF) composite ultrafiltration membranes were prepared by a phase inversion method, N,N-dimethylacetamide (DMAc) was used as solvent and polyvinylpyrrolidone (PVP) was used as dispersant, nanoTiO2 and AgNO3 were used as addictive materials. With different doping content of nanoTiO2 and silver ions, those hybrid films have different functions and structure. The basic performance and photocatalytic properties of those ultrafiltration membranes were studied in detail. The experiment results show that adding nanosized TiO2 particles will make the porosity of PVDF membrane increase, adding silver ion with low content can not improve water flux and porosity of membranes, however, nanoTiO2 and silver ions doping together can effectively improve the photocatalytic degradation rate.

Preparation and Characterization of BaBi2Nb2O9/PVDF Inorganic-Organic Composite Ultrafiltration Membranes

2013 ◽  
Vol 681 ◽  
pp. 309-313
Author(s):  
Dong Hua Zhang ◽  
Li Jing Pan ◽  
Da Zhi Sun
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Rejection Rate ◽  
Inversion Method ◽  
Ultrafiltration Membranes ◽  
Cross Sectional ◽  
Uf Membranes ◽  
Phase Inversion Method

BaBi2Nb2O9/PVDF (polyvinylidene fluoride) composite ultrafiltration (UF)membranes were prepared by alloying BaBi2Nb2O9 (BBN) particles uniformly in the PVDF solution (15% polymer weight) and used a phase-inversion method. This paper studied the effect of the concentration of BBN from 0% to 5% in 0.2Mpa on pure water flux and rejection rate to Bovine serum albumin (BSA). The cross-sectional structures of composite membranes were observed by scanning electron microscopy (SEM). Moreover, XRD results revealed the crystal structure of PVDF. The experimental results showed that the BBN/PVDF composite ultrafiltration membranes were superior in separation performances than the pure PVDF membranes due to the addition of BBN.

Performance and Morphology of PVDF/PEG-POSS Hybrid Membrane

2015 ◽  
Vol 1096 ◽  
pp. 446-449
Author(s):  
Fang Hu ◽  
Jun Fen Sun
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Contact Angles ◽  
Hybrid Membrane ◽  
Separation Process ◽  
Hybrid Membranes ◽  
Shrinkage Ratio ◽  
Phase Separation Process ◽  
Pure Water Flux

Polyvinylidene fluoride (PVDF)/PEG-POSS hybrid membrane was prepared by immersion phase separation process. The hybrid membranes were characterized by pure water flux, retention ratio to BSA, contact angle, shrinkage ratio and scanning electron microscopy (SEM). The hydrophilicity of the membrane was improved. The contact angles decreases from 82.2°to 76.3°. The shrinkage ratio decreases and the pure water flux increased when 1.0% POSS was used.Keywords: polyvinylidene fluoride (PVDF); PEG-POSS; hybrid membrane; hydrophilicity

scholarly journals Fabricating novel PVDF-g-IBMA copolymer hydrophilic ultrafiltration membrane for treating papermaking wastewater with good antifouling property

2021 ◽  
Author(s):  
Yujia Tong ◽  
Wenlong Ding ◽  
Lijian Shi ◽  
Weixing Li
Keyword(s):  
Polyvinylidene Fluoride ◽  
Removal Rate ◽  
Pure Water ◽  
Water Flux ◽  
Oxygen Demand ◽  
Amphiphilic Copolymer ◽  
Ultrafiltration Membrane ◽  
Ultrafiltration Membranes ◽  
Pure Water Flux ◽  
Papermaking Wastewater

Abstract Ultrafiltration membranes are widely used for the treatment of papermaking wastewater. The antifouling performance of polyvinylidene fluoride (PVDF) ultrafiltration membranes can be improved by changing the hydrophilicity. Here, a novel amphiphilic copolymer material, PVDF grafted with N-isobutoxy methacrylamide (PVDF-g-IBMA), was prepared using ultraviolet-induced Cu(II)-mediated reversible deactivation radical polymerization. The amphipathic copolymer was used to prepare ultrafiltration membrane via NIPS. The prepared PVDF-g-IBMA ultrafiltration membrane was estimated using 1H NMR, FT-IR, and DSC. The contact angle, casting viscosity, and the permeation performance of the PVDF-g-IBMA ultrafiltration membrane were also determined. The pure water flux, bovine serum albumin removal rate, and pure water flux recovery rate of the PVDF-g-IBMA ultrafiltration membrane were 432.8 L·m−2·h−1, 88.4%, and 90.8%, respectively. Furthermore, for the treatment of actual papermaking wastewater, the chemical oxygen demand and turbidity removal rates of the membrane were 61.5% and 92.8%, respectively. The PVDF-g-IBMA amphiphilic copolymer ultrafiltration membrane exhibited good hydrophilicity and antifouling properties, indicating its potential for treating papermaking wastewater.

Preparation and Characterization of BaTiO3/ PVDF Inorganic-Organic Composite Ultrafiltration Membranes

2011 ◽  
Vol 356-360 ◽  
pp. 2158-2161
Author(s):  
Ling Di Chen ◽  
Guo Xi Jin ◽  
Xiao Bo Wu ◽  
Wan Zhong Lang ◽  
Da Zhi Sun
Keyword(s):  
Cross Section ◽  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Ultrafiltration Membranes ◽  
Pvdf Membrane ◽  
Force Microscopy ◽  
Atomic Force ◽  
Spongy Layer ◽  
Blend Polymer

Abstract.BaTiO3-PVDF(polyvinylidene fluoride) composite ultrafiltration membranes were prepared by a phase separation method.The surface and cross-section of the membranes were investigated by atomic force microscopy and scanning electron microscope.The results showed that the morphology of PVDF membrane can be disturbed by BaTiO3.Albumin bovine serum retention and the water flux of the blend membrane increase.The phenomenon is discussed in terms of the modification of spongy layer and finger-like structure in the blend polymer.

Formation Mechanism and Properties of Polyvinylidene Fluoride (PVDF)/Nano-Silica Hybrid Membranes

2010 ◽  
Vol 123-125 ◽  
pp. 93-96 ◽  
Author(s):  
Hui Ling Shen ◽  
Hua Liao ◽  
Chang Fa Xiao
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Hybrid Membrane ◽  
Sio2 Content ◽  
Hybrid Membranes ◽  
Nano Silica ◽  
Wet Phase Inversion ◽  
Pure Water Flux ◽  
Different Content

By means of the wet phase inversion process, the PVDF/silica (SiO2) hybrid membranes with different content of nano-silica (nano-SiO2) were prepared. It was investigated that the pure water flux and retention based on egg albumin solution for different PVDF hybrid membrane samples. The pure water flux and porosity of PVDF/SiO2 hybrid membranes are enhanced simultaneously with increasing SiO2 content in PVDF composite system. When SiO2 content is around 7.5%, the phase separation rate of casting solution increases to peak value, meanwhile, the retention of hybrid membrane achieves the best effect. The SEM micrographs show that the quantity of finger-like pores of PVDF/SiO2 hybrid membranes decreases and the micropores becomes fine compared to PVDF membrane. The results of DSC indicate that there are almost no effects on the melting point, but enhancement the fusion enthalpy and the crystallinity of PVDF along with increasing the SiO2 content.

Preparation and Characterization of Hydrophilic Ultrafiltration Membrane with PVDF and PAA Blends

2011 ◽  
Vol 480-481 ◽  
pp. 691-696 ◽  
Author(s):  
Li Guo Wang ◽  
Xiao Guang Zhang ◽  
Shi Qi Guo ◽  
Ai Min Wang ◽  
Xiu Ju Wang ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Polymer Concentration ◽  
Water Flux ◽  
Ultrafiltration Membrane ◽  
Ultrafiltration Membranes ◽  
Pvdf Membrane ◽  
Technical Parameters ◽  
Pure Water Flux

Hydrophilic Polyvinylidene fluoride (PVDF) flat ultrafiltration membranes were prepared by wet-spinning method. The influence of blending ratio ( the mass ratio of PVDF and PAA), polymer concentration on preparation of blending modified hydrophilic PVDF ultrafiltration membranes were investigated, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then, hydrophilic PVDF membranes were characterized in terms of IR spectra, contact angle, scanning electron microscopy images, pure water flux and rejection. The results showed that hydrophilic ultrafiltration membrane could be prepared with PAA and PVDF blends, the hydrophilicity improved greatly, and it was better than traditional PVDF membrane.

scholarly journals Inner Surface Hydrophilic Modification of PVDF Membrane with Tea Polyphenols/Silica Composite Coating

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4186
Author(s):  
Qiang Xu ◽  
Xiaoli Ji ◽  
Jiaying Tian ◽  
Xiaogang Jin ◽  
Lili Wu
Keyword(s):  
Composite Coating ◽  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Tea Polyphenols ◽  
Pvdf Membrane ◽  
Hydrophilic Modification ◽  
Silica Composite ◽  
Inner Surface ◽  
One Step ◽  
Modified Membrane

The use of Polyvinylidene fluoride (PVDF) membranes is constrained in wastewater treatment because of their hydrophobic nature. Therefore, a large number of researchers have been working on the hydrophilic modification of their surfaces. In this work, a superhydrophilic tea polyphenols/silica composite coating was developed by a one-step process. The composite coating can achieve not only superhydrophilic modification of the surface, but also the inner surface of the porous PVDF membrane, which endows the modified membrane with excellent water permeability. The modified membrane possesses ultrahigh water flux (15,353 L·m−2·h−1). Besides this, the modified membrane can realize a highly efficient separation of oil/water emulsions (above 96%).

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