Metal-Coordinated Nanofiltration Membranes Constructed on Metal Ions Blended Support toward Enhanced Dye/Salt Separation and Antifouling Performances

Abstract

Metal-phenol coordination is a widely used method to prepare nanofiltration membrane. However, the facile, controllable and scaled fabrication remains a great challenge. Herein, a novel strategy was developed to fabricate a loose nanofiltration membrane via integrating blending and interfacial coordination strategy. Specifically, iron acetylacetonate was firstly blended in Polyether sulfone (PES) substrate via non-solvent induced phase separation (NIPS), and then the loose selective layer was formed on the membrane surface with tannic acid (TA) crosslinking reaction with Fe3+. The surface properties, morphologies, permeability and selectivity of the membranes were carefully investigated. The introduction of TA improved the surface hydrophilicity and negative charge. Moreover, the thickness of top layer increased about from ~30 nm to 119 nm with the increase of TA assembly time. Under the optimum preparation condition, the membrane with assembly 3 h (PES/Fe-TA3h) showed pure water flux of 175.8 L·m−2·h−1, dye rejections of 97.7%, 97.1% and 95.0% for Congo red (CR), Methyl blue (MB) and Eriochrome Black T (EBT), along with a salt penetration rate of 93.8%, 95.1%, 97.4% and 98.1% for Na2SO4, MgSO4, NaCl and MgCl2 at 0.2 MPa, respectively. Both static adhesion tests and dynamic fouling experiments implied that the TA modified membranes showed significantly reduced adsorption and high FRR for the dye solutions separation. The PES/Fe-TA3h membrane exhibited high FRR of 90.3%, 87.5% and 81.6% for CR, EBT and MB in the fouling test, stable CR rejection (>97.2%) and NaCl permeation (>94.6%) in 24 h continuous filtration test. The combination of blending and interfacial coordination assembly method could be expected to be a universal way to fabricate the loose nanofiltration membrane for effective fractionation of dyes and salts in the saline textile wastewater.

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

“…After cleaning, the recovered pure water flux was restored to 27.3 L m −2 h −1 bar −1 , equating to 83.3% flux recovery ratio with bovine serum albumin (BSA) mixed salt solution. Nanofiber-based UF membranes based on the thin-film nanofibrous composite format having a nanocomposite barrier layer consisting of cross-linked poly(ethylene glycol) matrix as well as ultra-fine CNFs were examined in a study by Wang and group [ 138 ]. It was noted that the membrane developed was extremely hydrophilic and possessed superior antifouling characteristics, which were proved by long-term and short-term fouling experiments using bovine serum albumin (BSA) solution (1 g/L).…”

“…(Li. W and team [ 138 ] fabricated a novel composite nanofiltration membrane ( Figure 8 ) using sulfated cellulose nanofibril (SCNF) for nanofiltration application. The advanced membrane showed higher Na 2 SO 4 rejection above 98% along with a water permeability higher than 30 L·m −2 ·h −1 under two bars.…”

Removal of Scale-Forming Ions and Oil Traces from Oil Field Produced Water Using Graphene Oxide/Polyethersulfone and TiO2 Nanoribbons/Polyethersulfone Nanofiltration Membranes

“…Many bench-scale experiments of filtration membranes with variable applied pressure have employed a pressurizing pump [8,[23][24][25]. For dye and salt separation, Fang et al employed a peristaltic pump with a low-pressure feed of 0.2 MPa for nanofiltration employing the PES-iron ion complex [26]. For water treatment, Hudaib et al employed a ceramic TiO 2 nanofiltration membrane with a feed pressure of 0.2 MPa [27].…”

Fabrication of Defect‐Engineered MOF‐801 Membrane for Efficient Dye Rejection

“…Polycrystalline Metal-organic framework (MOF) membranes have shown promising application in efficient gas and liquid separation due to their tailorable framework structure, [1][2] high surface areas, [3] and rich functionality. [4] To date, hundreds of different types of MOF membranes have been fabricated and demonstrated attractive performances in gas separation (such as H 2 purification, [5] CO 2 capture [6] and olefin separation [7] ) and in liquid separation (such as dye rejection, [8][9][10][11][12][13][14][15][16][17][18][19][20] ion screening, [21] and pervaporation). [22][23][24] In terms of water treatment, MOFpolymer composite membranes have been widely studied for ion screening and dye rejection.…”