Core-shell graphene oxide-polymer hollow fibers as water filters with enhanced performance and selectivity
Artikel i vetenskaplig tidskrift, 2021

Commercial hollow fiber filters for micro- and ultrafiltration are based on size exclusion and do not allow the removal of small molecules such as antibiotics. Here, we demonstrate that a graphene oxide (GO) layer can be firmly immobilized either inside or outside polyethersulfone-polyvinylpyrrolidone hollow fiber (Versatile PES (R), hereafter PES) modules and that the resulting core-shell fibers inherits the microfiltration ability of the pristine PES fibers and the adsorption selectivity of GO. GO nanosheets were deposited on the fiber surface by filtration of a GO suspension through a PES cartridge (cut-off 0.1-0.2 mu m), then fixed by thermal annealing at 80 degrees C, rendering the GO coating stably fixed and unsoluble. The filtration cut-off, retention selectivity and efficiency of the resulting inner and outer modified hollow fibers (HF-GO) were tested by performing filtration on water and bovine plasma spiked with bovine serum albumin (BSA, 66 kDa, approximate to 15 nm size), monodisperse polystyrene nanoparticles (52 nm and 303 nm sizes), with two quinolonic antibiotics (ciprofloxacin and ofloxacin) and rhodamine B (RhB). These tests showed that the microfiltration capability of PES was retained by HF-GO, and in addition the GO coating can capture the molecular contaminants while letting through BSA and smaller polystyrene nanoparticles. Combined XRD, molecular modelling and adsorption experiments show that the separation mechanism does not rely only on physical size exclusion, but involves intercalation of solute molecules between the GO layers.

Författare

Alessandro Kovtun

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Antonio Bianchi

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Massimo Zambianchi

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Cristian Bettini

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Franco Corticelli

Istituto per la Microelettronica e Microsistemi

Giampiero Ruani

Consiglio Nazl Ric Inst Nanostruct Mat CNR ISMN

Letizia Bocchi

Medica

Francesco Stante

Laboratori Chimici Stante

Massimo Gazzano

Consiglio Nazl Ric Inst Organ Synth & Photoreact

Tainah Dorina Marforio

Universita di Bologna

Matteo Calvaresi

Universita di Bologna

Matteo Minelli

Universita di Bologna

Maria Luisa Navacchia

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Vincenzo Palermo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Manuela Melucci

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Faraday Discussions

1359-6640 (ISSN) 1364-5498 (eISSN)

Vol. 227 274-290

Ämneskategorier

Polymerteknologi

Materialkemi

Annan kemi

DOI

10.1039/c9fd00117d

PubMed

33300505

Mer information

Senast uppdaterat

2021-06-02