Design and Construction of Ag@MOFs Immobilized PVDF Ultrafiltration Membranes with Anti-bacterial and Antifouling Properties

Abstract

In this work, Ag nanoparticle loading Mg(C10H16O4)2(H2O)2(Ag@MOF) composite material was successfully prepared by a facile strategy, and subsequently Ag-MOFs were used to modify the PVDF ultrafiltration membranes to obtain fouling resistance and higher water flux. The as-prepared PVDF membranes were systematically characterized by a series of analytical techniques such as Water Contact Angle (CA), Scanning Electron Microscopy (SEM), and SEM-mapping. Furthermore, the performance of membranes on antibacterial properties, the pure water flux, and fouling resistance was investigated in detail. Those results showed that the membrane modified by Ag@MOFs containing 30% Ag had the higher anti-bacterial performance, and the clear zone could be increased to 10 mm in comparison with that of blank membrane. Meanwhile, the pure water flux of Ag@MOF membranes increased from 85 L/m2 h to 157 L/m2 h, and the maximum membrane flux recovery rate (FRR) of 95.7% was obtained using SA as pollutant, which is attributed to the introduction of Ag@MOF composite material. Based on the above experimental results, it can be found that the Ag-MOF membranes displayed the excellent antibacterial activity, high water flux, and fine fouling resistance. This work provides a facile strategy to fabricate the Ag@MOFs modified membranes, and it shows an excellent anti-bacterial and water flux performance.

Development of highly permeable and antifouling poly(vinylidene fluoride) hybrid membranes tailored with ZIF‐8 metal–organic frameworks for water treatment

“…As shown in Table 1, it is seen that the contact angle is reduced with the increment of ZIF‐8 into the PVDF matrix. This is probably due to the presence of hydrophilic NH groups of ZIF‐8 nanocrystals forming a water layer on the surface of PVDF/ZIF‐8 hybrid membranes 48 . Besides, the incorporation of ZIF‐8 nanoparticles into the PVDF dope solution speeds up the coagulation process during membrane fabrication, and thus membranes are formed with a porous structure and a rough surface.…”

Versatile Silver-Nanoparticle-Impregnated Membranes for Water Treatment: A Review

“…Incorporation of AgNPs improves the hydrophilicity of membranes and increases of 36-77% have been reported [55,75,85]. The incorporation of AgNPs into the poly sulphone membranes introduced noticeable changes in morphology and permeate flux, especially in dense mem-branes [86]; however, other studies reported no noticeable morphological changes [55,87]. Table 2 shows how incorporation of AgNPs modifies these surface characteristics and, hence, affects the flux and the fouling propensity.…”

“…Table 2 shows how incorporation of AgNPs modifies these surface characteristics and, hence, affects the flux and the fouling propensity. The pure water flux increased from 85 L/m 2 h to 157 L/m 2 h [87] The contact angle decreased from 62.8 • to 54 • for unmodified and Ag-ZnO modified membranes, respectively [89] Surface morphology Nanoparticles uniformly distributed on the surface of the membranes and no significant difference in roughness [55,87] Surface charge…”

An Evolving Insight into Metal Organic Framework-Functionalized Membranes for Water and Wastewater Treatment and Resource Recovery

“…Polymer precipitation occurs because of the solvent and nonsolvent exchange. , The exchange continues until demixing takes place in such a way that the initial homogeneous blending turns into two phases: the polymer-rich phase with embedded MOF particles that gives rise to the membrane structure and the liquid-rich phase that forms the pores. , The internal structure of the final membranes is asymmetric with a dense skin layer and finger-type pores. Several MOFs including ZIF-8, ZIF-L, MIL-53­(Al), MIL-68­(Al), HKUST-1, , HKUST-1@GO, Cu­(tpa)@GO, UiO-NH 2 , UiO-66@GO, MOF-5, Ag-MOF, Ce-MOF, Zn/Co-MOF-74, TMU-5, etc. have been used for functionalization of polymeric membranes for water and wastewater treatment applications.…”

“…112,113 The internal structure of the final membranes is asymmetric with a dense skin layer and fingertype pores. Several MOFs including ZIF-8, 114 ZIF-L, 115 MIL-53(Al), 116 MIL-68(Al), 117 HKUST-1, 118,119 HKUST-1@ GO, 120 Cu(tpa)@GO, 121 UiO-NH 2 , 122 UiO-66@GO, 123 MOF-5, 124 Ag-MOF, 125 Ce-MOF, 126 Zn/Co-MOF-74, 127 TMU-5, 128 etc. have been used for functionalization of polymeric membranes for water and wastewater treatment applications.…”