Water purification performance enhancement of PVC ultrafiltration membrane modified with tourmaline particles

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Runze Guan ◽  
Weixing Yan ◽  
Jingjing Yuan ◽  
Xia Feng ◽  
Yiping Zhao
Keyword(s):  
Phase Inversion ◽  
Performance Enhancement ◽  
Water Flux ◽  
Ultrafiltration Membrane ◽  
Pvc Membrane ◽  
Inversion Method ◽  
Hybrid Membranes ◽  
Phase Inversion Method ◽  
Lower Contact

Abstract In this study, a novel PVC/tourmaline ultrafiltration membrane was fabricated by phase inversion method in order to improve anti-fouling performance and water quality. FESEM was used to examine the changes in the morphology of pure PVC and PVC/tourmaline hybrid membranes. The introduction of tourmaline resulted in the increase of porosity and mean pore size. EDX images indicated that tourmaline particles were homogeneously dispersed in the membranes when the amount were less than 1.0 wt%. The hybrid membranes exhibited lower contact angle (78.7°) and higher water flux (121.3 L/m2 h) than the pure PVC membrane. The anti-fouling performance of the membranes were studied by filtration of BSA solution. The results demonstrated that the hybrid membrane with 1.0 wt% tourmaline particles exhibited the best anti-fouling performance and the highest BSA rejection. In addition, the pH and conductivity of the filtered water were measured by pH meter and electrical conductivity meter. And the results showed that the quality of the filtered water was improved after treating through the hybrid membranes.

Performance of PSf Ultrafiltration Membrane: Effect of Different Nonsolvent on Coagulation Medium

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Muhamad Fikri Shohur ◽  
Zawati Harun ◽  
W. J. Lau ◽  
Muhamad Zaini Yunos ◽  
Mohd Riduan Jamalludin
Keyword(s):  
Pore Structure ◽  
Phase Inversion ◽  
Pure Water ◽  
Water Flux ◽  
Bottom Layer ◽  
Ultrafiltration Membrane ◽  
Coagulation Bath ◽  
Inversion Method ◽  
Asymmetric Membrane ◽  
Result Analysis

One of the big challenges in developing a good asymmetric membrane  is macrovoid formation that leads to reduction of rejection value.  The most common method to reduce or suppress macrovoid formation is by addition of controlled solvent to the coagulation bath. Therefore, the effect of difference coagulants based on dissolved KCl (monovalent) and dissolved Na2SO4(divalent) with different concentration onto asymmetric Polysulfone (PSf) ultrafiltration membrane was investigated in this work. The PSf ultrafiltration membranes were prepared by using phase inversion method using these two immerse aqueous solutions. The performances of membranes were evaluated via pure water flux (distilled water) and solute rejection (humic acid). Results on the cross section revealed that the structure of membrane show a straight pattern of bigger finger-like pore structure from top to bottom layer tend to reduce with at the same time the diameter of finger-like pore structure  also increased, as salt medium of coagulant increases. These obviously shown by permeation values for both salt mediums were higher compared to without salt coagulant. This reduction of finger-like structure at bottom layer occurred along together with the formation of sponge shape structure. The growth of thick sponge shape is strongly influence by kinetic phase inversion of salt coagulant that also creates resistance to permeation mechanism. However the intense salt coagulant medium can cause the bigger sponge structure that will slightly reduce rejection and increase the permeation.  This was proved by the rejection of KCl medium started to increase at 1-3% but slightly reduced at 4%. Based on the result analysis demonstrated that the ideal membrane with highest rejection and good permeation values was membrane immersed into 1% Na2SO4 coagulation medium.

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.

Influence of Inorganic Additives on the Performance of Polysulfone Ultrafiltration Membrane

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Muhamad Zaini Yunos ◽  
Zawati Harun ◽  
Hatijah Basri ◽  
Mohd Fikri Shohur ◽  
Mohd Riduan Jamalludin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Zinc Oxide ◽  
Pure Water ◽  
Water Flux ◽  
Antibacterial Properties ◽  
Ultrafiltration Membrane ◽  
Inversion Method ◽  
Pure Water Flux ◽  
Phase Inversion Method ◽  
Oxide Membrane

The influence of zinc oxide and silver (I) oxide in polysulfone ultrafiltration membrane was studied. The membranes were prepared via phase inversion method. The morphology, surface roughness, hydrophillicity and antibacterial properties of membrane were investigated using SEM, AFM and contact angle device consecutively. It was found that membrane with zinc oxide additive has excellent pure water flux as compared to silver (I) oxide. However silver (I) oxide has better humic acid rejection due to the tradeoff effect. SEM-EDX for PSf/silver (I) oxide reveals that the accumulation of silver on top area in cross section of membrane while for zinc oxide seems more concentrated on the bottom. Interestingly, the AFM results support the previous result when PSf/zinc oxide showed better surface roughness on the top of the membrane. Eventhough zinc oxide is known one of antibacterial material, however from qualitative experiment using disc diffusion test (e-coli), there is no inhibition ring for PSf/zinc oxide membrane as compared to membrane with PSf/silver (I) oxide membrane which shows excellence inhibition ring.

The Research of Hydrophilic Modification of PVC/PES Blended Membrane by the Additive of CA

2014 ◽  
Vol 1052 ◽  
pp. 8-13
Author(s):  
Shu Hong Jiang ◽  
Jun Wu ◽  
Hong Zhong Zhou ◽  
Chuan Wei Jiang ◽  
Jun Wang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Phase Inversion ◽  
Water Flux ◽  
Inversion Method ◽  
Equilibrium Water Content ◽  
X Ray ◽  
Hydrophilic Modification ◽  
Poly Vinyl Chloride ◽  
Phase Inversion Method ◽  
Blended Membrane

In order to improve the performance of Poly(vinyl chloride)(PVC)/ polyethersulfone (PES) blended membranes, cellulose acetate (CA) was used as a hydrophilic enhancer to blend with PVC and PES for membrane preparation by phase inversion method. In this study, the results of equilibrium water content (EWC), contact angle and X-ray photoelectron spectroscopy (XPS) confirmed the addition of CA could effectively improve the hydrophilicity of PVC/PES blended membrane. It was also found that water flux of PVC/PES/CA blended membranes increased with the increase of CA concentration.

scholarly journals Improvement of Properties and Performances of Polyethersulfone Ultrafiltration Membrane by Blending with Bio-Based Dragonbloodin Resin

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4436
Author(s):  
Aulia Chintia Ambarita ◽  
Sri Mulyati ◽  
Nasrul Arahman ◽  
Muhammad Roil Bilad ◽  
Norazanita Shamsuddin ◽  
...  
Keyword(s):  
Humic Acid ◽  
Acid Solution ◽  
Phase Inversion ◽  
Water Flux ◽  
Inversion Method ◽  
Water Permeation ◽  
Porous Microstructure ◽  
And Performance ◽  
Pes Membrane ◽  
Phase Inversion Method

Polyethersulfone (PES) is the most commonly used polymer for membrane ultrafiltration because of its superior properties. However, it is hydrophobic, as such susceptible to fouling and low permeation rate. This study proposes a novel bio-based additive of dragonbloodin resin (DBR) for improving the properties and performance of PES-based membranes. Four flat sheet membranes were prepared by varying the concentration of DBR (0–3%) in the dope solutions using the phase inversion method. After fabrication, the membranes were thoroughly characterized and were tested for filtration of humic acid solution to investigate the effect of DBR loading. Results showed that the hydrophilicity, porosity, and water uptake increased along with the DBR loadings. The presence of DBR in the dope solution fastened the phase inversion, leading to a more porous microstructure, resulted in membranes with higher number and larger pore sizes. Those properties led to more superior hydraulic performances. The PES membranes loaded with DBR reached a clean water flux of 246.79 L/(m2·h), 25-folds higher than the pristine PES membrane at a loading of 3%. The flux of humic acid solution reached 154.5 ± 6.6 L/(m2·h), 30-folds higher than the pristine PES membrane with a slight decrease in rejection (71% vs. 60%). Moreover, DBR loaded membranes (2% and 3%) showed an almost complete flux recovery ratio over five cleaning cycles, demonstrating their excellent antifouling property. The hydraulic performance could possibly be enhanced by leaching the entrapped DBR to create more voids and pores for water permeation.

Compatibility of Polyvinylidene Difluorid/Polyurethane and Preparation of Composite Tubular Membrane

2014 ◽  
Vol 936 ◽  
pp. 212-217
Author(s):  
Dan Ying Zuo ◽  
Hong Jun Li ◽  
Chang Hai Yi ◽  
Hou Lei Gan
Keyword(s):  
Phase Inversion ◽  
Water Flux ◽  
Mixing Enthalpy ◽  
Inversion Method ◽  
Membrane Porosity ◽  
Phase Inversion Method ◽  
Tubular Membranes ◽  
Parameter Theory ◽  
Precipitation Phase ◽  
Liquid Liquid Phase Separation

The compatibility of polyvinylidene difluorid (PVDF) and polyurethane (PU), the thermodynamics of the PVDF/PU/DMF (N-N-Dimethylformamide) membrane-forming systems were studied, and the composite tubular membranes of PVDF/PU-PET knitted fabric tube were prepared by the immersion precipitation phase inversion method. The results showed that the PVDF/PU system was partly compatible by the measurements of the solubility parameter theory, the mixing enthalpy, the viscosity. With PU content increasing, the gelation values increased and the instantaneous liquid-liquid phase separation was preferred to occur. The water flux of the composite tubular membranes were enhanced from 1264.81 to 2165.35 L/m2.h with PU content increasing from 10wt% to 40wt%, which resulted from the an increment of the membrane porosity and the improvement of the hydrophilicity.

Performance enhancement of polysulfone ultrafiltration membrane by blending with polyurethane hydrophilic polymer

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Gangasalam Arthanareeswaran ◽  
S. Velu ◽  
Loganathan Muruganandam
Keyword(s):  
Performance Enhancement ◽  
Pure Water ◽  
Water Flux ◽  
Skin Layer ◽  
Coagulation Bath ◽  
Inversion Method ◽  
Transmembrane Pressure ◽  
Molecular Weights ◽  
Casting Solution ◽  
Phase Inversion Method

Abstract The aim of this work was to study the effect of two solvents such as N,N′-dimethylformamide (DMF) and dimethylacetamide (DMAc) used in the production of polysulfone (PSf) and polyurethane (PU) blend ultrafiltration membranes, influence permeability and selectivity. PSf/PU membranes were prepared by the phase inversion method using polymer concentrations of 100/0, 20/80 and 0/100 wt%. Permeation performance of the prepared membranes was evaluated in terms of pure water flux, water content and hydraulic resistance. It was found that the membrane composed of 20/80 wt% of PSf/PU in the presence of DMAc showed a water flux of 60.5 l m-2h-1 under transmembrane pressure of 345 kPa, and the water flux of 23.5 l m-2h-1 for 20/80 wt% of PSf/PU in the presence of DMF. With increasing the polarity of DMAc in the casting solution, an increase in porous layer thickness was observed, and then a good water flux of membranes can be obtained. It was found that the polar solvent caused the rapidly demixing of casting solution in coagulation bath and formed porous asymmetric membranes with defective skin layer. The permeation rates of proteins were measured with different molecular weights of the proteins.

Preparation of PEI Ultrafiltration Membrane with Excellent Thermal Resistance

2013 ◽  
Vol 787 ◽  
pp. 228-230 ◽  
Author(s):  
Run Lin Han
Keyword(s):  
Molecular Weight ◽  
Wastewater Treatment ◽  
Organic Solvent ◽  
Thermal Resistance ◽  
Phase Inversion ◽  
Ultrafiltration Membrane ◽  
Inversion Method ◽  
Low Molecular Weight ◽  
Membrane Material ◽  
Phase Inversion Method

Polyetherimide (PEI) with excellent solvent resistance and thermal resistance is a good membrane material which is studied in detail. PEI ultrafiltration membrane with low molecular weight cut-off is prepared by phase inversion method in this work. The membrane showed high resistance to PEG1000 which can be used in wastewater treatment with organic solvent.

scholarly journals Pengembangan Membran Magnesol untuk Pemurnian Biodiesel

2013 ◽  
Vol 9 (3) ◽  
pp. 118 ◽  
Author(s):  
Saiful Saiful ◽  
Nurfitriana Nurfitriana ◽  
Muliadi Ramli ◽  
Ilham Maulana
Keyword(s):  
Phase Inversion ◽  
Water Flux ◽  
Acid Value ◽  
Acid Number ◽  
Inversion Method ◽  
Transmembrane Pressure ◽  
Potassium Soap ◽  
Adsorptive Membrane ◽  
Phase Inversion Method ◽  
Better Than

Magnesol membrane has been prepared by mixing chitosan polymer with magnesol particles via phase inversion method. The optimum compositions of adsorptive membranes were 3% chitosan, 15% DMF and 60% loading adsorbent. The porosity of these membranes was 34,17% and swelling degree was 51,91%. The membrane clean water flux was 224,4 Lm‑2h‑1 at a transmembrane pressure of 2.5 bar.  The adsorptive membrane possesses an open and interconnected porous structure with a large surface area available for biodiesel purities adsorption. The results showed that after contacting in 60 minutes, numbers of acid value was reduced as 81,12% which is in accordance with value of SNI quality standards. In addition, the soap content adsorbed was 86,74%  as potassium soap and 86,73% as sodium soap. The regenerated membrane can be reused with mantaining the high adsorption capacity. The methanol was better than ethanol to regenerate the magnesol membrane. The Magnesol membrane will be a new alternative method for biodiesel purification.Keywords: biodiesel, membrane adsorption, chitosan, magnesol, acid number, soap

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