Influence of the polyacrylonitrile proportion on the fabricated UF blend membranes’ performance for humic acid removal

2018 ◽  
Vol 38 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Heba Abdallah ◽  
Tarek S. Jamil ◽  
A.M. Shaban ◽  
Eman S. Mansor ◽  
Eglal R. Souaya
Keyword(s):  
Humic Acid ◽  
High Performance ◽  
Polymer Mixture ◽  
Permeate Flux ◽  
Pore Former ◽  
Treated Water ◽  
Feed Pressure ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Blend Membranes

Abstract Asymmetric blend membranes of polyethersulfone (PES)/polyacrylonitrile (PAN) were prepared and developed for ultrafiltration applications. The membranes were prepared by dissolving two polymers in N-methyl-2-pyrrolidone (NMP) as a solvent with diethylene glycol (DEG) and polyvinylpyrrolidone (PVP) as non-solvent and pore former, respectively. The produced membranes were characterized by scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy, and the hydrophilicity of membranes was tested by contact angle measurements. The performance of prepared membranes was carried out by an ultrafiltration testing unit, where the efficiency of membranes was determined according to the humic acid separation and treated water permeate flux. The results indicated that using 1 wt.% of PAN in polymer mixture provided a blending membrane with high mechanical properties and high performance; the humic acid rejection reached 92.47% with treated water permeate flux 70 l/m2·h at feed pressure 6 bar.

scholarly journals Develop an integrating coagulation and RO systems to treat highly turbid water using synthesized coagulants

2022 ◽  
Author(s):  
Yogendra Singh Solanki ◽  
Madhu Agarwal ◽  
A. B. Gupta
Keyword(s):  
Saturation Index ◽  
Stability Index ◽  
Turbid Water ◽  
Permeate Flux ◽  
Treated Water ◽  
Feed Pressure ◽  
Coagulation Performance ◽  
Langelier Saturation Index ◽  
Ro Membrane ◽  
Ph Range

Abstract In the present study coagulation process was used as pretreatment for the RO membrane with turbid raw water collected from Bisalpur Dam, Rajasthan, India. To optimize coagulation performance, three kinds of coagulants, namely, Alum (commercially available), synthesized inorganic polymeric coagulant-medium basicity (IPC-M), and inorganic polymeric coagulant-ultra high basicity (IPC-UH) were examined for turbidity removal with varying operating parameters. It was observed that in the optimum pH range of 6–7, the IPC-UH resulted as the best performing coagulant with 0.99 mg/L equivalent Al2O3 dose revealing 2 NTU residual turbidity and residual aluminium of 0.001 mg/L. Moreover, Langelier saturation index and Ryznar stability index values were evaluated at optimum conditions of all the three coagulants proclaiming negligible scaling potential. Furthermore, the coagulant-treated water (100 L) was fed to the RO membrane, and the performance was noted in terms of flux, pressure, and TDS. It was observed that IPC-UH has the lowest reduction in permeate flux of 0.78 L/min/m2 compared to commercially available coagulant alum (0.90 L/min/m2). Also, the increased feed pressure was observed for all the coagulants treated water with the lowest value of 2.3 kg/cm2 for IPC-UH, which was 2.5 kg/cm2 for Alum (commercially available coagulant). Henceforth, integration of coagulation before the RO system resulted in effective pretreatment of turbid water with very minute scaling.

scholarly journals Investigation of the Ultraviolet Irradiation on Blend Films of PS/PCL

2021 ◽  
Vol 6 (2) ◽  
pp. 29-33
Author(s):  
João de Deus Pereira De Moraes Segundo ◽  
Maria Oneide Silva De Moraes ◽  
Catarina Barbosa Levy ◽  
Walter Ricardo Brito
Keyword(s):  
Contact Angle ◽  
Ultraviolet Light ◽  
Room Temperature ◽  
Polymer Mixture ◽  
Blend Films ◽  
Mechanical Stirring ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Poly Caprolactone ◽  
Mechanical Rotation

In this work, an investigation was carried out on the effect of ultraviolet light on different films. Polystyrene (PS), poly (caprolactone) (PCL), and blended films of PS/PCL were produced. Ethyl acetate (AE) was used as a solvent, and PS and PCL solutions were prepared by dissolving 250 mg in 2.5mL of AE under mechanical stirring at room temperature. The blended solutions of PS/PCL (PS:PCL) were prepared with different mass proportions, such as 90:10, 80:20, 70:30, and 60:40 into 2.5 mL of EA. The solutions were dripped with 500 µL on a glass substrate, and the films were produced with mechanical rotation of N=2000 RPM for 15 seconds using a Spin coater. The films were submitted to ultraviolet light for t=60 minutes and morphologically analyzed by optical microscopy, chemically by IR spectroscopy, and superficially by contact angle and wettability; this last analysis also investigated the effect of ultraviolet light at t=0, t=30, and t=60 minutes. The exposure of ultraviolet light on the films affected its morphologies. IR spectra showed that the photodegradation increased for larger PCL amounts into the blend. The contact angle measurements showed that after exposure to ultraviolet light, the hydrophobicity of the films increased. Therefore, the presence of PCL in the polymer mixture promoted the photodegradation of the PS/PCL films, making it attractive for developing new packaging.

scholarly journals Polydopamine Linking Substrate for AMPs: Characterisation and Stability on Ti6Al4V

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3714
Author(s):  
Zuzanna Trzcińska ◽  
Marc Bruggeman ◽  
Hanieh Ijakipour ◽  
Nikolas J. Hodges ◽  
James Bowen ◽  
...  
Keyword(s):  
High Performance ◽  
Release Profile ◽  
Water Contact ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Titanium Alloy Ti6al4v ◽  
Thickness Measurements

Infections are common complications in joint replacement surgeries. Eradicated infections can lead to implant failure. In this paper, analogues of the peptide KR-12 derived from the human cathelicidin LL-37 were designed, synthesised, and characterised. The designed antimicrobial peptides (AMPs) were attached to the surface of a titanium alloy, Ti6Al4V, by conjugation to a polydopamine linking substrate. The topography of the polydopamine coating was evaluated by electron microscopy and coating thickness measurements were performed with ellipsometry and Atomic Force Microscopy (AFM). The subsequently attached peptide stability was investigated with release profile studies in simulated body fluid, using both fluorescence imaging and High-Performance Liquid Chromatography (HPLC). Finally, the hydrophobicity of the coating was characterised by water contact angle measurements. The designed AMPs were shown to provide long-term bonding to the polydopamine-coated Ti6Al4V surfaces.

Synthesis and Characterization of Cellulose Acetate Blend Ultrafiltration Membranes： The Effect of Degrees of Substitution

2013 ◽  
Vol 634-638 ◽  
pp. 2072-2076
Author(s):  
Lin Lin Kong ◽  
Da Lun Zhang ◽  
Zi Qiang Shao ◽  
Bai Xin Han ◽  
Ya Liang Chen
Keyword(s):  
Cellulose Acetate ◽  
High Performance ◽  
Permeate Flux ◽  
Ultrafiltration Membranes ◽  
Force Microscopy ◽  
Atomic Force ◽  
Phase Inversion Technique ◽  
Blend Membranes ◽  
Cellulose Acetates ◽  
Hydrophilic Membrane

Cellulose acetate (CA), a hydrophilic membrane material, was selected to prepare ultrafiltration membrane for the aim of achieving high-performance membranes with respect to flux and rejection characteristics. In order to prepare membranes with improved properties, blending of cellulose acetates with different degrees of substititution(DS) has been attempted. In this study, polymeric blend ultrafiltration membranes based on cellulose acetate with different DS were prepared by phase inversion technique. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle are used to understand the influence of DS on the properties of modified membranes. The blend membranes prepared were subjected to the separation of egg albumin (EA). The separation and permeate flux efficiencies of the blend membranes were discussed.

SEPARATION OF ETHYL ACETATE FROM WATER MIXTURE USING SAGO/POLY (VINYL ALCOHOL) BLENDED MEMBRANES: EFFECT OF SAGO BLENDED RATIOS

2015 ◽  
Vol 75 (1) ◽  
Author(s):  
Abdulhakim M. Alamaria ◽  
Mohd Ghazali Mohd Nawawi
Keyword(s):  
Ethyl Acetate ◽  
Poly Vinyl Alcohol ◽  
Water Mixture ◽  
Solution Casting ◽  
Casting Technique ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Blend Membranes ◽  
Solution Casting Technique ◽  
Feed Temperature

Relatively new Sago/PVA blended membranes were prepared by solution casting technique. Homogenous sago/PVA membranes were prepared with different ratio of sago content in the membrane. The blended membranes were characterized using Fourier Transform Infrared Spectroscopy (FTIR), contact angle measurements, and degree of swelling (DS). The blended membranes were tested for pervaporation of ethyl acetate-water mixture at a range of 1-4wt% of water in the solution. The effects of feed temperature and concentration were investigated. The permeation flux increased around 30% with sago content in the blend membranes from 3wt% to 7wt% at 60oC. However, the separation factor decreased from 433 to 387 for same membrane.

scholarly journals Biopolymeric Membrane Enriched with Chitosan and Silver for Metallic Ions Removal

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1792 ◽  
Author(s):  
Simona Căprărescu ◽  
Roxana Gabriela Zgârian ◽  
Graţiela Teodora Tihan ◽  
Violeta Purcar ◽  
Eugenia Eftimie Totu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Synthetic Wastewater ◽  
Polymeric Membrane ◽  
Polymer Mixture ◽  
Gravimetric Analysis ◽  
Iron Ions ◽  
Treatment Rate ◽  
Excellent Thermal Stability ◽  
Angle Measurements ◽  
Contact Angle Measurements

The present paper synthesized, characterized, and evaluated the performance of the novel biopolymeric membrane enriched with cellulose acetate and chitosan (CHI)-silver (Ag) ions in order to remove iron ion from the synthetic wastewater using a new electrodialysis system. The prepared membranes were characterized by Fourier Transforms Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR), Thermal Gravimetric Analysis (TGA) and Differential Thermal Analysis (DSC), contact angle measurements, microscopy studies, and electrochemical impedance spectroscopy (EIS). The electrodialysis experiments were performed at the different applied voltages (5, 10, and 15 V) for one hour, at room temperature. The treatment rate (TE) of iron ions, current efficiency (IE), and energy consumption (Wc) were calculated. FTIR-ATR spectra evidenced that incorporation of CHI-Ag ions into the polymer mixture led to a polymer-metal ion complex formation within the membrane. The TGA-DSC analysis for the obtained biopolymeric membranes showed excellent thermal stability (>350 °C). The contact angle measurements demonstrated the hydrophobic character of the polymeric membrane and a decrease of it by CHI-Ag adding. The EIS results indicated that the silver ions induced a higher ionic electrical conductivity. The highest value of the iron ions treatment rate (>60%) was obtained for the biopolymeric membrane with CHI-Ag ions at applied voltage of 15 V.

scholarly journals High-performance cellulose acetate/polysulfone blend ultrafiltration membranes for removal of heavy metals from water

2017 ◽  
Vol 75 (10) ◽  
pp. 2422-2433 ◽  
Author(s):  
Pourya Moradihamedani ◽  
Abdul Halim Abdullah
Keyword(s):  
Heavy Metals ◽  
Cellulose Acetate ◽  
High Performance ◽  
Water Flux ◽  
Polymer Composition ◽  
Permeate Flux ◽  
Ultrafiltration Membranes ◽  
Pore Former ◽  
Phase Inversion Technique ◽  
The Impact

Neat cellulose acetate (CA) and CA/polysulfone (PSf) blend ultrafiltration membranes in the presence of polyvinylpyrrolidone as a pore former were prepared via a phase inversion technique. The prepared membranes were characterized by Fourier transform infrared, scanning electron microscopy, mechanical strength, water content, porosity, permeate flux and heavy metals (Pb2+, Cd2+, Zn2+ and Ni2+) rejection to comprehend the impact of polymer blend composition and additive on the properties of the modified membranes. The water flux expanded by increasing of PSf content in the polymer composition. CA/PSf (60/40) had the highest flux among prepared membranes. Prepared blend membranes were able to remove heavy metals from water in the following order: Pb2+ > Cd2+ > Zn2+ > Ni2+. The CA/PSf (80/20) blend membrane had great performance among prepared membranes due to the high heavy metals removal and permeate flux.

scholarly journals Improvement of Membrane Distillation Using PVDF Membrane Incorporated with TiO2 Modified by Silane and Optimization of Fabricating Conditions

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 95
Author(s):  
Fida Tibi ◽  
Seong-Jik Park ◽  
Jeonghwan Kim
Keyword(s):  
Direct Contact ◽  
Phase Inversion ◽  
Membrane Distillation ◽  
Inversion Method ◽  
Permeate Flux ◽  
Pvdf Membrane ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Phase Inversion Method ◽  
Silane Concentration

The objectives in this study are to improve the performance of PVDF membrane by incorporating TiO2 and silane at various dosages and optimize fabricating conditions by using response surface methodology (RSM) for membrane distillation (MD) application. The PVDF membrane was synthesized by phase inversion method using various TiO2, silane and polymer concentrations. Membranes were characterized by performing contact angle measurements, SEM and FTIR observations. Ammonia rejection and permeate flux were measured by operating a direct contact distillation module treating ammonium chloride solution. A PVDF membrane created by adding TiO2 modified by silane improved membrane hydrophobicity. However, the effect of silane on membrane hydrophobicity was less pronounced at higher TiO2 concentrations. Highest ammonium rejection was associated with the highest membrane hydrophobicity. RSM analysis showed that fabricating conditions to achieve highest flux (10.10 L/m2·h) and ammonium rejection (100.0%) could be obtained at 31.3% silane, 2.50% TiO2, and 15.48% polymer concentrations. With a PVDF-TiO2 composite membrane for MD application, the effect of TiO2 was dependent upon silane concentration. Increasing silane concentration improved membrane hydrophobicity and ammonium rejection. RSM analysis was found to bea useful way to explore optimum fabricating conditions of membranes for the permeate flux and ammonium rejection in MD.

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