Nano‐Modification of the Polyvinyl Alcohol/Organic Acid‐Modified Polyvinylidene Fluoride Thin‐Film Composite Membrane and Its Application in the Nanofiltration Process

2021 ◽  
pp. 2000767
Author(s):  
Nazanin Abbasi Eskandary ◽  
Majid Pakizeh ◽  
Mahdieh Namvar‐Mahboub
Keyword(s):  
Thin Film ◽  
Polyvinyl Alcohol ◽  
Organic Acid ◽  
Composite Membrane ◽  
Polyvinylidene Fluoride ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite

scholarly journals Preparation and characterization of PVA thin-film composite membrane for pervaporation dehydration of ethanol solution

2021 ◽  
Vol 947 (1) ◽  
pp. 012010
Author(s):  
Phuong Thanh Ngoc Thai ◽  
Xuan Minh Pham ◽  
Thuc Ba Nguyen ◽  
Thu Minh Le ◽  
Chau Bao Viet Tran ◽  
...  
Keyword(s):  
Thin Film ◽  
Polyvinyl Alcohol ◽  
Composite Membrane ◽  
Separation Performance ◽  
Permeation Flux ◽  
Ethanol Fuel ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite ◽  
High Separation

Abstract These days, ethanol fuel has been widely consumed worldwide to replace gasoline due to its possible environmental and long-term economic advantages. In detail, the ethanol fuel (purity ≥ 99.5 wt%) has been produced by traditional separation processes such as azeotropic distillation or molecular sieve adsorption, which excessively employs energy and capital cost. The pervaporation has already been considered as an effective alternative to conventional methods because of its high separation efficiency and low power consumption. Pervaporation separation of ethanol/water solution using hydrophilic membranes has been extensively studied owing to their superior perm-selectivity. In this present work, the polyvinyl alcohol thin-film composite membrane is prepared by casting a thin crosslinked polyvinyl alcohol (PVA) film on the polyacrylonitrile (PAN) porous substrate. The effect of PVA concentration on the pervaporation performance of the fabricated membrane is studied. The physicochemical properties of the prepared membrane are characterized using FTIR, SEM images, and contact angle measurements. The separation performance in terms of permeation flux and selectivity is simultaneously evaluated through a pervaporation dehydration of ethanol/water mixture of 80/20 wt.% at 60°C. The results show that the increase in PVA concentration leads to the decline in the hydrophilicity and the growth of the thickness and swelling degree of the membrane. Therefore, the selectivity of the membrane is found to improve significantly, while the permeation flux decreased with the PVA concentration ranging from 2.5 to 15 wt.%. Based on the results, the PVA membrane prepared from the 10 wt.% concentration is likely to provide high separation performance.

FORMULATION OF HYBRID MEMBRANE LAYER BY USING PVA/CHITOSAN BLENDED POLYMERS ON POROUS POLYSULFONE SUPPORT, AND THE APPLICATION ON COPPER ION REMOVAL

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
Nurul Aida Sulaiman ◽  
Norin Zamiah Kassim Shaari ◽  
Norazah Abd Rahman ◽  
Mohammad Hafizh Abd Fathel ◽  
Aqila Zulaikha Nazreen Elangko
Keyword(s):  
Thin Film ◽  
Polyvinyl Alcohol ◽  
Composite Membrane ◽  
Copper Ion ◽  
Hybrid Membrane ◽  
Optimum Concentration ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite ◽  
Percentage Removal

In this study, a thin film composite membrane was fabricated by using hybrid membrane as the barrier layer and polysulfone membrane as base membrane. During the formulation of hybrid membrane, a polymer blend of polyvinyl alcohol with chitosan was chosen as organic polymer and it was cross-linked with tetraethylorthosilicate (TEOS), where sol gel method is used to prepare the hybrid membrane. Phase inversion method is used to prepare the base membrane. The aim of this study is to determine the optimum concentration of the polymer for porous support membrane as well as the concentration of chitosan and TEOS in the fabrication of the thin film composite. Four concentrations of polysulfone (PSF) solution was prepared (13wt%, 14wt%, 15wt% and 17wt %) and the optimum concentration was determined.  For the hybrid membrane, concentration of chitosan solution was varied at1wt%, 2wt% and 3wt% with fixed concentration of polyvinyl alcohol (PVA) solution (10wt %). Results showed that 2wt% chitosan and 13 wt% PSF is sufficient to remove acceptable percentage of copper ion. For this purpose of identifying optimum amount of TEOS, pH of the feed copper ion solution was adjusted to three conditions (pH 3, 7, 10). Although, the percentage removal is highest at pH 10 but when dealing with natural integrated complexation method, pH 7 is found to be the optimum pH for the removal of copper ion. Besides that, 3 wt% TEOS in hybrid membrane has found to give a remarkable percentage removal of copper ion. Overall, a new formulation of thin film composite membrane show  a great potential to compete with those commercial membrane in thin film composite membrane application especially separation process. 

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