Polypyrrole vapor phase polymerization on PVDF membrane surface for conductive membrane preparation and fouling mitigation

Abstract

BACKGROUND Conductive membranes, such as carbon material modified membrane and nickel metal film could be used for membrane fouling mitigation and energy generation during filtration. However, it is necessary to simplify the preparation process and reduce the cost for practical application. Here, a conducting polymer polypyrrole was polymerized on PVDF membrane surface for conductive membrane preparation via vapor phase polymerization. RESULTS After modification, the pure water flux was reduced from 3393.26 ± 222.99 L m‐2 h‐1 to 569.48 ± 150.82 L m‐2 h‐1. The contact angle was 58.63° for blank membrane after 8 s of delay, which was reduced to 27.53° for modified membrane. During short‐term filtration, the modified membrane maintained high, stable flux and low effluent turbidity. The fouling of conductive membrane can be mitigated by 1 V cm‐1 of electric filed during long‐term filtration. Better effluent properties were obtained from modified membrane, which were improved further when an electric field was applied. CONCLUSION It is concluded that the conductive membrane has a smoother and more hydrophilic surface, resulting in better anti‐fouling and effluent properties with the assistance of an electric field. © 2017 Society of Chemical Industry

In-Situ Modification of Nanofiltration Membranes Using Carbon Nanotubes for Water Treatment

“…NF90 showed a pure water flux of 2.13 ± 0.39 L/m 2 h bar, due to its small pore size (r pore = 0.34 nm). The pure water flux value of the NF90-Ppy-CNTs membrane was reduced to 0.63 ± 0.18 L/m 2 h bar, due to pore blockage by the unreacted Ppy on the surface [ 58 , 59 ]. For the NF270 membrane (r pore = 0.42 nm), the pure water flux value was 3.68 ± 0.42 L/m 2 h bar, while NF270-PPy-CNTs showed a similar value (3.67 ± 0.83 L/m 2 h bar).…”

Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review

“…To diminish the membrane-foulant hydrophobic interaction, hydrophilic modification has been implemented on the membrane substrate material via blending (Guo et al, 2019;Tao et al, 2019) or copolymerization (Sun et al, 2013;Wang S. et al, 2018), the membrane outer surface via hydrophilic (Higuchi et al, 2002;Li et al, 2015) or superhydrophilic grafting/coating (Liang et al, 2014(Liang et al, , 2018Li et al, 2018;Zhao et al, 2018;, and the inner pore walls (Liang et al, 2012). The membrane-foulant electrostatic repulsion could be enhanced or electrostatic attraction reduced by modifying the membrane charge properties via, for instance, in situ deposition of electrically conductive polymers such as polyaniline, polypyrrole, and polythiophene on the surface or in the pore structure (Zhan et al, 2004;Qiang et al, 2011;Liu et al, 2012;Sun et al, 2018). Applying an electric capacitive carbon material (e.g., activated carbon) as the supporting layer of the UF membrane could also increase the electrostatic repulsion when negatively charged (Liang et al, 2019).…”

Surface modification of anti‐fouling novel cellulose/graphene oxide (GO) nanosheets (NS) microfiltration membranes for seawater desalination applications

“…There are different methods to reduce membrane biofouling in the pretreatment unit, including membrane modification and integration with other technologies, such as ion‐exchange, coagulation, and others . The modification of membranes with antibacterial nanomaterial via surface coating and blending is considered to be more practical and has shown encouraging results . Graphene oxide nanosheets (GONSs) have shown great potential in this aspect due to their remarkable antibacterial activity and relatively low cost .…”

“…13,14 The modification of membranes with antibacterial nanomaterial via surface coating and blending is considered to be more practical and has shown encouraging results. 2,[15][16][17][18][19][20][21] Graphene oxide nanosheets (GONSs) have shown great potential in this aspect due to their remarkable antibacterial activity and relatively low cost. 22 These GONSs can be manufactured with a simple oxidation process of graphite.…”