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Organic Solvent-free Constructing of Stable Zeolitic Imidazolate Framework Functional Layer Enhanced by Halloysite Nanotubes and Polyvinyl Alcohol on Polyvinylidene Fluoride Hollow Fiber Membranes for Treating Dyeing Wastewater by Dawei Ji; Haowei Feng; Wanning Wang; Fang Zhou; Shulin Yang; Kaikai Chen; Changfa Xiao is a Chemistry article available to read on EtoBox.

What is Organic Solvent-free Constructing of Stable Zeolitic Imidazolate Framework Functional Layer Enhanced by Halloysite Nanotubes and Polyvinyl Alcohol on Polyvinylidene Fluoride Hollow Fiber Membranes for Treating Dyeing Wastewater about?

In this study, zeolitic imidazolate framework (ZIF-8)/polyvinylidene fluoride (PVDF) loose nanofiltration (NF) hollow fiber membranes were fabricated by constructing ZIF-8 functional layer on the PVDF supporting membranes based on the vacuum-assisted assembly process. The ZIF-8 synthesis was completed in a water system, and the synthesized ZIF-8 suspension was directly added to polyvinyl alcohol (PVA) and halloysite nanotubes (HNTs) aqueous solution system without drying to prepare the casting solution, which could solve the agglomeration and poor dispersion problem of ZIF-8 particles. In addition, the embedded HNTs and the loaded PVA among the ZIF-8 layer could improve the bonding strength between the ZIF-8 layer and the supporting membranes. After constructing ZIF-8 functional layer, the pore size of supporting membranes decreased from more than 300 nm to several nanometers. Furthermore, the water contact angle reduced from 91.1° to 54.2°. Applied to treat dye wastewater, the prepared ZIF-8/PVDF membranes maintained high dye rejection (˃99.0 %) for Congo red (CR), but low salt rejection for NaCl (about 2 %). In addition, the flux could reach 21.6 L m-2h−1 after continuous filtrat

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Author

Dawei Ji; Haowei Feng; Wanning Wang; Fang Zhou; Shulin Yang; Kaikai Chen; Changfa Xiao

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)