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

Wentao Xu,Zehai Xu,Shangchan Gao,Mianli Huang,Qingbiao Li,Huaqiang Zhuang,Guoliang Zhang

doi:10.1155/2020/5456707

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.

Highlights

With the growing demand for high water quality, many new technologies of water puri cation are being developed to supply potable and palatable water to humans
E result of X-ray diffraction (XRD) indicated the construction of Mg-MOF has not changed modi ed by AgNPs. e Ag@MOFs had not observed di raction peaks at 38.1°, 44.2° attributed crystalline planes of the face-centered cubic structured Ag (JCPDS, 04-0783), which might be veiled by Strong XRD peak of MgMOF
To con rm the Ag nanoparticles deposited onto the surface of Mg-MOF, the Scanning Electron Microscopy (SEM) of Mg-MOF and Ag@MOF was presented in Figure 2, it suggested AgNPs were dispersed homogeneously on Mg-MOF

Summary

Introduction

With the growing demand for high water quality, many new technologies of water puri cation are being developed to supply potable and palatable water to humans. Hydrophilic surface is supposed to improve the anti-fouling property, and several techniques increase their a nity toward water molecules which have been studied to prepare modi ed PVDF membranes. Advances in Polymer Technology hydrophilic modified membranes have developed [11, 12] These methods are limited by the fact that the hydrophilic modification occurs only on the membrane surface, and washes out of the matrix during membrane formation and operation [13, 14]. MOFs had been used as modifiers in polymer membranes to enhance the mechanical strength and hydrophilic properties of membranes due to its large specific surface area and abundant oxygen-containing surface group, and MOFs had been added into membrane to prepare antifouling ultrafiltration membranes [40,41,42,43,44]. The anti-bacterial efficiencies of membranes were evaluated by the filter-paper method

Materials and Methods

Results and Discussion

60 M0 BSA