PDMS/PAI-HF Composite Membrane Containing Immobilized Palladium Nanoparticles for 4-Nitrophenol Reduction
Abstract
Catalytically active asymmetric membranes were developed by crosslinking a polydimethylsiloxane (PDMS) thin layer onto a porous polyamide‐imide hollow fiber (PAIHF) support, followed by grafting of aminosilane with hydroxyl derived-PDMS/PAIHF, and finally palladium nanoparticles (PdNPs) immobilization using salicylic aldehyde. Aminosilane and salicylic aldehyde linkers were used to permanently immobilize PdNPs onto the PDMS surface through metal coordination chelation, which prevented their agglomeration and leaching from the catalytic membrane reactor (CMR) module. The obtained CMRs were used for hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in a continuous-flow fashion. The effects of 4-NP concentration (0.5-4 mM) and flow rate (0.01-0.08 cm3 min-1) on 4-NP conversion and 4-AP selectivity were evaluated in both batch and continuous-flow systems. The newly developed continuous flow 4-NP hydrogenation module exhibited a good operating stability after six cycle run for 6 h’ time on stream, where complete 4-NP conversion (100%) was achieved in short residence time (2-3 s) via a single-pass-through the CMR module. Overall, the designed and developed method described herein offers an alternative platform to address PdNPs’ leaching issues that are commonly encountered in continuous-flow chemical transformation processes.
Recommended Citation
Y. He et al., "PDMS/PAI-HF Composite Membrane Containing Immobilized Palladium Nanoparticles for 4-Nitrophenol Reduction," Chemical Engineering Journal, vol. 410, Elsevier B.V, Apr 2021.
The definitive version is available at https://doi.org/10.1016/j.cej.2020.128326
Department(s)
Chemistry
Second Department
Chemical and Biochemical Engineering
International Standard Serial Number (ISSN)
1385-8947
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 Elsevier B.V, All rights reserved.
Publication Date
15 Apr 2021
Comments
The authors thank the National Science Foundation (NSF CBET-2019350) for financially supporting this project.