Aminated metal‐organic framework (NH₂‐MIL‐101(Cr)) incorporated polyvinylidene (PVDF) hybrid membranes: Synthesis and application in efficient removal of Congo red from aqueous solution

Abstract

The efficient treatment of wastewater containing organic dyes generated in diverse industrial processes has become more crucial owing to increasing environmental concerns. In this paper, we incorporated the aminated functional NH2‐MIL‐101(Cr) into the porous polyvinylidene fluoride (PVDF) to fabricate the MOFs/polymer hybrid membranes, which combined the surface activity of MOFs and the membrane's filtration plus the adsorption process, and can be used in the high‐efficient removal of congo red (CR) from aqueous solution. Two synthesis strategies were employed, and both of which are useful in fabricating the NH2‐MIL‐101(Cr)@PVDF hybrid membranes. The NH2‐MIL‐101(Cr) particles are mainly incorporated into the pores of PVDF, and thus enhance the hydrophilicity, water flux as well as porosity of the hybrid membranes. In the adsorption experiments, the influences of various conditions including the solution pH, adsorption time, adsorption isotherms, reusability, and the filtration performances were investigated systematically, and all the hybrid membranes show evidently improved adsorption performances compared to original PVDF films. The adsorption thermal and dynamics analyses indicate that the adsorption process is mainly featured in Langmuir monolayer adsorption and chemical adsorption. The hydrogen bonding at the interface of CR/NH2‐MIL‐101(Cr) is responsible for the selective adsorption of CR. The excellent reusability and the dynamic adsorption performances determine the potential applications of MOF‐based hybrid membranes in the membrane separation of CR from practical waste water.

MOFs meet membrane: application in water treatment and separation

“…158 For instance, Tan et al prepared MOF–polymer hybrid membranes by incorporating functionalized NH 2 -MIL-101 (Cr) into porous PVDF using a co-blending method. 159 The –NH 2 groups in the CR dye and NH 2 -MIL-101 (Cr) undergo chemisorption through hydrogen bonding. Incorporating the MOF particles improves the membrane's hydrophilicity and porosity, achieving good adsorption separation of dye wastewater.…”

A metal organic framework decorated 2-dimensional nanomaterial based nanocomposite photocatalyst for photocatalytic degradation of dyes from textile industry wastewater

“…The formation of the protective hydration layer due to the h-BN and TiO 2 functionalized chromium-benzenedicarboxylate metalorganic framework MIL-101(Cr) based photocatalyst on the Environmental Science: Water Research & Technology Paper membrane surface enhanced the water contact angle, which simultaneously favors the high flux and improves the antifouling characteristics of the membranes. 29,30 In addition, the hydrophilicity of resultant membranes is enhanced by the surface modification with h-BN and TiO 2 functionalized MIL-101(Cr) and the presence of oxygen containing groups in nanoparticles. It is observed that the surface hydrophilicity of the photocatalytic h-BN functionalized MIL-101(Cr) PVDF is very high compared to the other photocatalytic PVDF MMMs.…”

The Defects, Physicochemical Properties, and Surface Charge of MIL-88A (Al) Crystal Were Regulated for Highly Efficient Removal of Anionic Dyes: Preparation, Characterization, and Adsorption Mechanism

“…So far, a large number of chemical, physical, and biological methods have been used to remove dyes from wastewater, − such as ion exchange, chemical oxidation, flocculation, chemical coagulation, curing, photocatalytic degradation, biodegradation, advanced oxidation, membrane separation, and adsorption . Among them, the adsorption method has the advantages of low cost, safety, simplicity, and easy recovery.…”

“…6 Therefore, to reduce the harm to the ecological environment and human health, it is very important to find a practical, convenient, and rapid wastewater treatment method. So far, a large number of chemical, physical, and biological methods have been used to remove dyes from wastewater, 7−9 such as ion exchange, 10 chemical oxidation, 11 flocculation, 12 chemical coagulation, 13 curing, 14 photocatalytic degradation, 15 biodegradation, 16 advanced oxidation, 17 membrane separation, 18 and adsorption. 19 Among them, the adsorption method has the advantages of low cost, safety, simplicity, and easy recovery.…”