High‐flux PVDF membrane incorporated with β‐cyclodextrin modified halloysite nanotubes for dye rejection and Cu (II) removal from water

Abstract

The application of polyvinylidene fluoride (PVDF) membrane is impeded by its intrinsic hydrophobic property. In this work, a series of novel membranes were fabricated by blending different contents of β‐cyclodextrin modified halloysite nanotubes (β‐CD‐HNTs) into the casting solution. Elemental mapping images confirmed the good dispersion of β‐CD‐HNTs in the PVDF membrane matrix. The microstructure of membrane was improved as revealed by the morphological characterizations. Besides, the permeation and separation performances of all membranes were extensively studied. The results demonstrated that as‐prepared blend membranes exhibited better hydrophilicity, which included lower contact angle and higher water flux than pristine PVDF membrane. In the separation experiments, the dye rejection for the blend membranes was not declined (85%‐90%), even though the pore size of membranes was increased with the addition of β‐CD‐HNT nanoparticles. More importantly, because of the chelation reaction between β‐CD‐HNTs and heavy metal, the removal ratio of Cu (II) for 3 wt.% content of blend membrane could reach 20.9%, compared with unmodified membrane of 4.2%. After 3 filtration cycles, blend membranes showed superior antifouling property. Overall, this method demonstrated very promising characteristics for removing different scales of pollutants using membrane technology.

Beta-Cyclodextrin Molecules (β‐CD) Modified PVDF Membranes to Remove Multi-Ionic Dye Solutions using Steric, Inclusion, and Dielectric Exclusion

“…For higher PVP loading (3wt%), the addition of GO-Ag composite (0.15wt%) results in polarity and flux enhancement [85]. With the incorporation of just 0.36 wt.% of β-CD-HNTs, the water flux experiences a slight yet remarkable boost [86]. These comparisons provide further insight for conducting deeper experiments.…”

Utilization of ionic liquids for preferential separation of thorium during the determination of trace metallic constituents in thorium matrix using ICP-OES

“…Though membrane-based technology has been widely considered as clean and environmentally benign technology, 64–66 solvent extraction being conventional and easily adoptable at a large scale has been utilized throughout the present investigation. For the estimation of thorium, 283.231 nm, 283.730 nm and 401.913 nm analytical lines were chosen.…”

Cellulose, Cellulose Benzoate and Cellulose Citrate from Screw Pine (Pandanus tectorius) Leaves as PVDF Filler for Improved Permeability and Anti-fouling Properties

“…Even at very low filler content in PVDF polymer could improve the membrane properties and performance [55]. In the same filtration method, PMC0.3, PMCB0.3, and PMCC0.3 have a better rejection of dye than modified PVDF membrane with GO/ LiCl [4], Cu 2 S nanoparticles [52], and Fe 3 O 4 @XG [1], also comparable with PVDF/-CD-HNTs [56]. This research revealed that cellulose, cellulose benzoate, and cellulose citrate screw pine leaves can be used as fillers for PVDF membrane which gave a comparable membrane performance with inorganic filler.…”