scholarly journals Characterization Study of PVDF/ Cloisite Hollow Fiber Membrane in Aqueous Diethanolamine

2017 ◽  
Vol 18 (1) ◽  
Author(s):  
R. Naim ◽  
S. Abdullah ◽  
N. Zulkifli
Keyword(s):  
Contact Angle ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Immersion Test ◽  
Sem Analysis ◽  
Membrane Properties ◽  
Fiber Membrane ◽  
Characterization Study ◽  
Entry Pressure ◽  
Before And After

Different concentrations of PVDF/Cloisite hollow fiber membranes were prepared and studied via immersion test. The differences in membrane properties were observed by immersion tests at 10 days, 20 days and 30 days in DEA solution. The membranes were characterized via liquid entry pressure (LEPW) and contact angle. Surface morphology analysis study was conducted before and after immersion test using scanning electron microscopy. From the result obtained, the liquid entry pressure and contact angle showed decreasing effect after immersion in DEA solution for 30 days. SEM analysis indicated that increasing DEA concentration creates more finger-like structure compared to pristine membrane. Incorporation of cloisite into PVDF membranes improves the contact angle value but development of more finger-like structure is subjected to wetting problem.

scholarly journals Preparation of Hollow Fiber Membrane Containing ZnO Nanoparticles to Remove Natural Organic Matter

2021 ◽  
Vol 8 (2) ◽  
pp. 11-20
Author(s):  
Abdullah Adnan Abdulkarim ◽  
Yosra Mohammed Mahdi ◽  
Haider Jasim Mohammed
Keyword(s):  
Zinc Oxide ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Sem Analysis ◽  
Inversion Method ◽  
Fiber Membrane ◽  
Modified Membrane

Polyethersulfone/zinc oxide mixed matrix hollow fiber membrane was fabricated using dry/wet phase inversion method. Zinc oxide nanoparticles (2 wt.%) were dispersed in N,N-dimethylacetamide (DMAc) solvent in the present of polyvinylepyrrolidene. The dope solution speed and take up speed was similar with performing the spinning process at room temperature. The produced membranes were characterized using scanning electron microscope (SEM), atomic force microscope (AFM), and Fourier transform infrared (FTIR) analysis. Membrane performance was evaluated using pure water flux (PWF), relative flux ration (RFR), and total organic carbon (TOC) removal efficiency. From SEM analysis, it was found that the nanoparticles were well dispersed in the polymeric matrix. From AFM results, it was observed that the modified membrane has higher surface roughness. The PWF of the modified membrane was enhanced, while the RFR showed to increase due to rougher membrane surface. The NOM remaoval of PES/ZnO membrane was higher than that of PES membrane and reached to 27% compared to only 16.9 % for pristine PES.

PVDF-CLOISITE HOLLOW FIBER MEMBRANE FOR CO2 ABSORPTION VIA MEMBRANE CONTACTOR

2017 ◽  
Vol 79 (1-2) ◽  
Author(s):  
Izzati Ahmad Rudaini ◽  
Rosmawati Naim ◽  
Sureena Abdullah ◽  
Nadzirah Mohd Mokhtar ◽  
Juhana Jaafar
Keyword(s):  
Contact Angle ◽  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Entry Pressure ◽  
Long Term Performance ◽  
Term Performance

The effect of cloisite concentrations on CO2 absorption via polyvinylidene fluoride-cloisite hollow fiber in membrane contactor system was investigated. PVDF polymer was modified by introducing different compositions of cloisite clay (S1: 0%, S2:1 wt%, S3: 3 wt% and S4: 5 wt%) into the polymer solution. The hollow fiber membranes were examined via liquid entry pressure (LEPw), contact angle and scanning electron microscope (SEM). CO2 absorption test was conducted at different liquid absorbent flow rates of 1M MEA. S4 gives highest Liquid entry pressure value and S3 obtained highest contact angle value at around 87.21º. Different concentrations of cloisite exhibited various finger-like structure with sponge-like morphology on the membrane lumen side. Meanwhile, the highest CO2 absorption flux of 3.41×10-2 mol/m2.s at flowrate of 200 ml/min was obtained for membrane S4. Long term performance for membrane S4 up to 55 hours of CO2 absorption showed increasing absorption trend up to 6.78 ×10-2 mol/m2.s of CO2 fluxes. 

scholarly journals Non-Solvent Influence of Hydrophobic Polymeric Layer Deposition on PVDF Hollow Fiber Membrane for CO2 Gas Absorption

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 41
Author(s):  
Abdul Latif Ahmad ◽  
Amir Ikmal Hassan ◽  
Leo Choe Peng
Keyword(s):  
Contact Angle ◽  
Hollow Fiber ◽  
Polymer Coating ◽  
Hollow Fiber Membrane ◽  
Gas Absorption ◽  
Dense Layer ◽  
Fiber Membrane ◽  
Hydrophobic Membrane ◽  
Coating Solution ◽  
Modified Membrane

The implementation of hydrophobicity on membranes is becoming crucial in current membrane technological development, especially in membrane gas absorption (MGA). In order to prevent membrane wetting, a polypropylene (PP) dense layer coating was deposited on a commercial poly(vinylidene fluoride) (PVDF) hollow fiber membrane as a method of enhancing surface hydrophobicity. The weight concentration of PP pellets was varied from 10 mg mL−1 to 40 mg mL−1 and dissolved in xylene. A two-step dip coating was implemented where the PVDF membrane was immersed in a non-solvent followed by a polymer coating solution. The effects of the modified membrane with the non-solvent methyl ethyl ketone (MEK) and without the non–solvent was investigated over all weight concentrations of the coating solution. The SEM investigation found that the modified membrane surface transfiguration formed microspherulites that intensified as PP concentration increased with and without MEK. To understand the coating formation further, the solvent–non-solvent compatibility with the polymer was also discussed in this study. The membrane characterizations on the porosity, the contact angle, and the FTIR spectra were also conducted in determining the polymer coating properties. Hydrophobic membrane was achieved up to 119.85° contact angle and peak porosity of 87.62% using MEK as the non-solvent 40 mg mL−1 PP concentration. The objective of the current manuscript was to test the hydrophobicity and wetting degree of the coating layer. Hence, physical absorption via the membrane contactor using CO2 as the feed gas was carried out. The maximum CO2 flux of 3.33 × 10−4 mol m−2 s−1 was achieved by 25 mg modified membrane at a fixed absorbent flow rate of 100 mL min−1 while 40 mg modified membrane showed better overall flux stability.

scholarly journals Deposition of a polymeric porous superhydrophobic thin layer on the surface of poly(vinylidenefluoride) hollow fiber membrane

2013 ◽  
Vol 15 (3) ◽  
pp. 1-6 ◽  
Author(s):  
A.L. Ahmad ◽  
H.N. Mohammed ◽  
B.S. Ooi ◽  
C.P. Leo
Keyword(s):  
Contact Angle ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Carbon Dioxide Capture ◽  
Simple Approach ◽  
Absorption System ◽  
Fiber Membrane ◽  
Water Contact ◽  
High Contact Angle ◽  
Modified Membrane

Abstract Porous superhydrophobic layer of low-density polyethylene (LDPE) was created by a simple approach on the Poly(vinylidenefluoride) (PVDF) hollow fiber membranes. Acetone and ethanol mixtures with different volume ratios were used as the non-solvent on the coating surface. A 5:1 (v/v) acetone/ethanol ratio provided a porous surface with a 152° ± 3.2 water contact angle. The high contact angle could reduce membrane wettability for better carbon dioxide capture when the membrane was used as gas-liquid contactor in absorption processes. To assess the effect of the created superhydrophobic layer, the pristine and modified membranes were tested in a CO2 absorption system for ten days. The results revealed that the absorption flux in the modified membrane was higher than that of pristine membrane.

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