Modification Of PVDF Membrane Using Lignin And Calcium Carbonate For Oily Water Separation To Be Used In Water Dispenser
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Date
2021-06-17
Authors
Rajesveran, Dinesvaran
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Lignin is the world's second most abundant biopolymer and source of aromatic
structures which consist of plenty of hydrophilic groups. Lignin have the ability to be
used as a hydrophilic promoter in membrane fabrication due to its property which able
to improve the hydrophilicity and antifouling properties of hydrophobic membranes.
In this work, lignin was introduced and coated on both polyvinylidene fluoride, PVDF
and PVDF with CaCO3 loading for oily water separation. PVDF and PVDF with 3
wt% CaCO3 loading membranes were immersed in 0.75 g of the lignin solution
containing sodium chloride, NaOH and distilled water. The pristine PVDF and lignin
coated membranes were characterized with Fourier-transform infrared (FTIR)
spectroscopy, and scanning electron microscope (SEM) for comparison. The dynamic
underwater contact angle was used to examine the hydrophilic properties of the
modifed membranes. The pure water permeability was greatest in
PVDF_lignin_CaCO3 removal (PVDF-Lig-CCR), followed by PVDF_lignin_CaCO3
(PVDF-Lig-CC), pristine PVDF and PVDF_lignin (PVDF-Lig). The usage of 0.2 M
EDTA-disodium solution able to remove the calcium carbonate as the porosity of the
modified membrane is reduced. The PVDF-coated lignin membrane exhibits
antifouling properties with oil rejection up to 99.36% while the pristine PVDF
membrane only rejected 87.50%. The presence of lignin as a hydrophilic promoter
coated on PVDF membrane showed a good antifouling performance although it has
lower but stable oily water permeability.