Multiple effect of thermal treatment approach on PVDF membranes: Permeability enhancement and silver nanoparticles immobilization

Kamarudin, Diyana and Hashim, N. Awanis and Ong, Boon Hoong and Kakihana, Yuriko and Higa, Mitsuru and Matsuyama, Hideto (2021) Multiple effect of thermal treatment approach on PVDF membranes: Permeability enhancement and silver nanoparticles immobilization. Journal of Environmental Chemical Engineering, 9 (4). ISSN 2213-2929, DOI

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Impregnation of the noble metal, silver nanoparticles (AgNPs) as a disinfectant into the polymeric membrane is one of the empirical modification methods in producing safe drinking water. However, the dispersion and immobilization of AgNPs during membrane fabrication and application is least discussed despite numerous leaching phenomena reported. In this study, silver nanoparticles type 1 (AgNPs-1) and type 2 (AgNPs-2) were prepared and incorporated into polyvinylidene fluoride (PVDF) ultrafiltration membrane with the presence of thermal treatment. The effect of thermal treatment was studied at temperature 25 degrees C, 40 degrees C and 55 degrees C which significantly influenced the physicochemical characteristics of the PVDF membrane. Membrane incorporated with AgNPs-1 and AgNPs-2 fabricated at highest temperature portrayed improved mechanical properties and pure water flux. PVDF/PVP/AgNPs-2 membrane released the smallest amount of Ag (3.81%) while PVDF/PVP/ AgNPs-1 cast at 40 degrees C released the largest amount of Ag (42.34%) during the phase inversion at fabrication. Notably, no Ag leaching was found in all membranes during the dead-end filtration at 0.5 bar. Membranes with AgNPs-1 and AgNPs-2 showed remarkable bactericidal performance towards E. coli with a percentage reduction of 90.38% and 80.77%, respectively. Thus, membranes with AgNPs fabricated at 55 degrees C offered better mechanical properties of the enhanced permeability and excellent stability of AgNPs immobilization which signified the thermal treatment approach.

Item Type: Article
Funders: University of Malaya Research Grant (RP034D-15AET), Ministry of Education, Malaysia (FP040-2018A)
Uncontrolled Keywords: Silver nanoparticles immobilization; Polymeric membrane; Thermal treatment phase inversion
Subjects: Q Science > Q Science (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering > Department of Chemical Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 08 Aug 2022 07:03
Last Modified: 08 Aug 2022 07:03

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