Preparation and Characterization of PVDF Modified Ultrafiltration Membrane for Purification of Hg in Water

2013 ◽  
Vol 575-576 ◽  
pp. 265-269 ◽  
Author(s):  
Xiu Ju Wang ◽  
Xing Jie Lu ◽  
Wei Ying Xu ◽  
Jia Chen Zhu ◽  
Li Guo Wang
Keyword(s):  
Polyvinylidene Fluoride ◽  
Retention Rate ◽  
Water Flux ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Ultrafiltration Membrane ◽  
Mercury Ion ◽  
Water Contact ◽  
Pvdf Membrane ◽  
Modified Membrane

The 2-thiol benzothiazole was blended in Polyvinylidene fluoride (PVDF) membrane to prepare a kind of PVDF modified ultrafiltration membrane that could be used to remove mercury ion in water treatment. The water flux and retention rate of BSA of obtained PVDF modified ultrafiltration membrane was 222 L/m2·h and 92.33% respectively. The membrane performance were characterized by infrared spectroscopy (FT-IR) and water contact angle measurement. The results showed that, the PVDF modified membrane presented better adsorption ability for mercury ion than the traditional PVDF membrane. After 4 phases of adsorption/desorption, the modified membrane maintained a mercury ion adsorption amount of 0.264 mg/cm2and the desorption rate could reached 94%.

scholarly journals Effect of Kenaf MCC composition on Thin Film Composite membrane for NaCI Rejection

2019 ◽  
Vol 258 ◽  
pp. 04003
Author(s):  
Azman Ismail ◽  
Ramlah Mohd Tajuddin ◽  
Hamizah Mohktar ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Thin Film ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Sem Images ◽  
Water Contact ◽  
Membrane Performance ◽  
Pure Water Flux

A modified thin film PSf-MCC reverse osmosis membrane was prepared by interfacial polymerization between aqueous MPD and TMC as the organic monomer. Aim of this study is to determine the effect of MCC in membrane formulation and fabrication. The surface and cross section morphology of TFC PSF/MCC membrane shows MCC particle which able to improve hydrophilicity of the membrane. The SEM images showed dense and porous structure of the MCC incorporated membranes. In addition, the water contact angle measurement also confirmed the increased hydrophilicity of the modified membranes. The effect of MCC on membrane matric influence the membrane performance in terms of NaCl rejection and pure water flux. Results showed that TFC PSf/MCC membrane shows NaCl rejection up to 98.9% compared with TFC PSf membrane. TFC PSf/MCC membrane also showed the highest pure water flux which is 3.712 Lm2/hr compare with TFC PSF membrane which is 3.606 Lm2/hr. The overall result proved that MCC particle could improve membrane hydrophilicity hence, increased pure water flux and salt rejection.

scholarly journals Preparation and Characterization of a Hydrophilic Polysulfone Membrane Using Graphene Oxide

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Hoan Thi Vuong Nguyen ◽  
Thu Hong Anh Ngo ◽  
Khai Dinh Do ◽  
Minh Ngoc Nguyen ◽  
Nu Thi To Dang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Water Contact Angle ◽  
Water Flux ◽  
Feed Solution ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Inversion Method ◽  
Water Contact ◽  
Polysulfone Membrane

In general, the polysulfone (PSf) membranes are popular choices for water treatment because they have high thermal stability and good chemical resistance. On the other hand, the filtration capacity of the polysulfone membrane is limited because of its low water flux and poor antifouling ability, which are caused by the low surface hydrophilicity of the membranes. In this research, blending of graphene oxide (GO) or graphene oxide-titanium dioxide (GO-TiO2) mixture into the polysulfone matrix had been carried out through the phase inversion method to enhance the hydrophilic and antifouling properties. Methods such as energy-dispersive X-ray spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and water contact angle measurement were used to examine the surface properties of the prepared membranes. Experimental results have led to a conclusion that graphene oxide can be stabilized into prepared membranes, and then, by reducing the water contact angle values, the surface of these membranes becomes hydrophilic, which increases the permeability and the water flux of methylene blue from the aqueous feed solution, improving the membrane’s antifouling resistance.

Effect of Nano-Sized ZnO Particle Addition on PVDF Ultrafiltration Membrane Performance

2011 ◽  
Vol 311-313 ◽  
pp. 1818-1821 ◽  
Author(s):  
Yang He ◽  
Jun Ming Hong
Keyword(s):  
Aqueous Solution ◽  
Polyvinylidene Fluoride ◽  
Tensile Elongation ◽  
Water Flux ◽  
Reclaimed Water ◽  
Oxygen Demand ◽  
Inversion Method ◽  
Permeation Flux ◽  
Pvdf Membrane ◽  
Modified Membrane

In this study, a polyvinylidene fluoride (PVDF) ultrafiltration (UF) membrane was modified by dispersing nano-sized ZnO particles in a PVDF solution. PVDF membranes were fabricated by a phase inversion method. The permeation flux, mechanical properties, rejection of BSA aqueous solution and reclaimed water treatment were examined. The results indicate that the permeation flux of the modified membrane was lower than the neat PVDF membrane. The maximum tension force and tensile elongation length were improved initially for the modified membrane. The rejection of BSA aqueous solution was improved to 98.4%, while the neat PVDF membrane was 87.26%, and the relative water flux reduction was lower than the neat PVDF membrane. The chemical oxygen demand (COD) removal of the reclaimed water treated by the modified membrane was 46.36%, while the neat PVDF membrane was 14.09%.

scholarly journals Incorporation of PVDF Nanofibre Multilayers into Functional Structure for Filtration Applications

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 771 ◽  
Author(s):  
Remi Roche ◽  
Fatma Yalcinkaya
Keyword(s):  
Polyvinylidene Fluoride ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Filtration ◽  
Size Analysis ◽  
Air Filtration ◽  
Water Contact ◽  
Pore Size Analysis ◽  
Lamination Process ◽  
Temperature Force

Membranes are considered as a promising technology for separation and filtration processes. Here, novel polyvinylidene fluoride (PVDF) nanofibrous multilayer membranes were fabricated by wire-based industrial electrospinning equipment following by a lamination process. The lamination process was optimised under various applied temperature, force of lamination, and lamination time. Air permeability and burst-pressure tests were run to determine the optimum membranes for filtration application. The structures of the prepared membranes were characterised by scanning electron microscopy and pore-size analysis. The hydrophilic properties of the membranes were evaluated using water contact angle measurement, and the mechanical strength of the membranes was analysed. Air and water filtration tests were run to find the possible application of prepared membranes. The air filtration results showed that membranes had high filtration efficiencies: Over 99.00% for PM2.5, and PM0.1. The water filtration results indicated that permeability of the membranes changed from 288 to 3275 L/m2hbar. The successful preparation of such an interesting material may provide a new approach for the design and development of electrospun filter membranes.

Fabrication and Characterization of Copper-Chelated Polyethersulfone/Polydopamine Microfiltration Membrane for Antifouling Applications

2021 ◽  
Vol 878 ◽  
pp. 23-27
Author(s):  
Xech Rafael Aldrei U. Dela Paz ◽  
Rhoda B. Leron
Keyword(s):  
Cell Structure ◽  
Pure Water ◽  
Water Flux ◽  
Antibacterial Properties ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Contact ◽  
Hydrophilic Character ◽  
Pure Water Flux ◽  
Pes Membrane

In this work, we investigated the applicability of polyethersulfone/polydopamine/copper (II) (PES/PDA/Cu2+) membrane composite in microfiltration. Pristine PES membrane was prepared via non-induced phase separation (NIPS), and the surface was modified by coating with PDA and deposition of Cu (II) to enhance its physical and antibacterial properties. The membrane was characterized using energy-dispersive X-ray spectroscopy, scanning electron microscopy and water contact angle measurement. The hydrophilic character of the PES membrane significantly increased and the mechanical properties were greatly improved. Results showed that the porosity of the membrane was affected by the concentration of the polymer in the casting solution, and the membrane was suitable for filtration application due to its open-cell structure. Pure water flux was enhanced upon surface modification implying that hydrophilicity has more influence on the flux than the shrinking of the pore size. The antibacterial assay suggested that the membranes possess antibacterial property.

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%).

scholarly journals Preparation, characterization, and photocatalytic performance of polyvinylidene fluoride membrane modified with TiO2-C hybrid aerogels

2016 ◽  
Vol 22 (3) ◽  
pp. 255-262 ◽  
Author(s):  
Jun Li ◽  
Jing Liu ◽  
Dongsu Bi ◽  
Xiaopin Guo ◽  
Peng Wang
Keyword(s):  
Mechanical Strength ◽  
Polyvinylidene Fluoride ◽  
Photocatalytic Performance ◽  
Pure Water ◽  
Water Flux ◽  
Angle Measurement ◽  
Photodegradation Rate ◽  
Pure Water Flux ◽  
Modified Membrane ◽  
Hybrid Aerogels

TiO2-C hybrid aerogels containing submicrometer anatase and carbon nanoparticles were prepared with TiCl4 and resorcinol-furfural. A modified polyvinylidene fluoride (PVDF) ultrafiltration membrane was prepared through phase inversion after dispersing the TiO2-C hybrid aerogel into a PVDF solution. The surface features, structure, and hydrophilicity of the membrane were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurement, and pure water flux. The mechanical strength of this membrane was also determined. The photocatalytic performance of the modified membrane was investigated using reactive brilliant red (X-3B) as a representative contaminant. Characterization results indicated that the TiO2-C hybrid aerogels were distributed evenly in the PVDF membrane, showing enhanced hydrophilicity, mechanical strength, and pure water flux. Furthermore, the photodegradation rate of X-3B through the modified membrane was significantly high owing to the photocatalytic action of the TiO2-C hybrid aerogels distributed in the modified membrane.

An effective approach to fabrication of antifouling ultrafiltration membrane based on zwitterionic polyimide

2016 ◽  
Vol 29 (9) ◽  
pp. 1006-1015 ◽  
Author(s):  
Yang Liu ◽  
Yuping Ai ◽  
Pengfei Huo ◽  
Haitao Huang ◽  
Jiyou Gu
Keyword(s):  
Water Flux ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Polymerization Reaction ◽  
Inversion Method ◽  
One Pot ◽  
Water Contact ◽  
Molar Ratios ◽  
Antifouling Property ◽  
Potential Applications

In this study, a new kind of membrane material, an aromatic zwitterionic polyimide (PI) copolymer, was synthesized through a one-pot polymerization reaction by precise variation of the molar ratios of different monomers with specific groups. The zwitterionic PI ultrafiltration (UF) membrane was prepared through an immersion precipitation phase inversion method and thoroughly characterized by scanning electron microscopy, water contact angle measurement, protein adsorption measurement, and UF experiment. The zwitterionic PI membrane showed significantly improved hydrophilicity and permeability and stable antifouling property. The amount of bovine serum albumin adsorbed on the zwitterionic PI membrane was considerably lower compared with the reference PI membrane. According to the cycle UF experiment for protein solution, the zwitterionic PI membrane had a water flux recovery ratio of 86.7%, compared with only 61.1% for the reference PI membrane. Moreover, the irreversible fouling of the zwitterionic PI membrane was significantly decreased, suggesting superior antifouling property. This new approach to the preparation of a zwitterionic polymer seems promising for potential applications in separation membrane.

scholarly journals Superhydrophobic functionalized cellulosic paper by copper hydroxide nanorods for oils purification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed S. Belal ◽  
Jehan El Nady ◽  
Azza Shokry ◽  
Shaker Ebrahim ◽  
Moataz Soliman ◽  
...  
Keyword(s):  
Contact Angle ◽  
Filter Paper ◽  
Separation Efficiency ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Absorption Capacity ◽  
Morphological Properties ◽  
Copper Hydroxide ◽  
Immersion Method ◽  
Water Contact

AbstractOily water contamination has been sighted as one of the most global environmental pollution. Herein, copper hydroxide nanorods layer was constructed onto cellulosic filter paper surface cured with polydopamine, Ag nanoparticles, and Cu NPs through immersion method. This work has been aimed to produce a superhydrophobic and superoleophilic cellulosic filter paper. The structure, crystalline, and morphological properties of these modified cellulosic filter paper were investigated. Scanning electron microscope images confirmed that the modified surface was rougher compared with the pristine surface. The contact angle measurement confirmed the hydrophobic nature of these modified surfaces with a water contact angle of 169.7°. The absorption capacity was 8.2 g/g for diesel oil and the separation efficiency was higher than 99%. It was noted that the flux in the case of low viscosity solvent as n-hexane was 9663.5 Lm−2 h−1, while for the viscous oil as diesel was 1452.7 Lm−2 h−1.

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