Graphene oxide–polysulfone filters for tap water purification, obtained by fast microwave oven treatment
Journal article, 2019

The availability of clean, pure water is a major challenge for the future of our society. 2-Dimensional nanosheets of GO seem promising as nanoporous adsorbent or filters for water purification; however, their processing in macroscopic filters is challenging, and their cost vs. standard polymer filters is too high. Here, we describe a novel approach to combine graphene oxide (GO) sheets with commercial polysulfone (PSU) membranes for improved removal of organic contaminants from water. The adsorption physics of contaminants on the PSU-GO composite follows Langmuir and Brunauer–Emmett–Teller (BET) models, with partial swelling and intercalation of molecules in between the GO layers. Such a mechanism, well-known in layered clays, has not been reported previously for graphene or GO. Our approach requires minimal amounts of GO, deposited directly on the surface of the polymer, followed by stabilization using microwaves or heat. The purification efficiency of the PSU-GO composites is significantly improved vs. benchmark commercial PSU, as demonstrated by the removal of two model contaminants, rhodamine B and ofloxacin. The excellent stability of the composite is confirmed by extensive (100 hours) filtration tests in commercial water cartridges.

​Recycling, Resources, Urban, Waste, Water

graphene

Author

Alessandro Kovtun

Istituto per la Sintesi Organica e la Fotoreattività

Massimo Zambianchi

Istituto per la Sintesi Organica e la Fotoreattività

Cristian Bettini

Istituto per la Sintesi Organica e la Fotoreattività

A. Liscio

Institute for Microelectronics and Microsystems

Massimo Gazzano

Istituto per la Sintesi Organica e la Fotoreattività

Franco Corticelli

Institute for Microelectronics and Microsystems

E. Treossi

Istituto per la Sintesi Organica e la Fotoreattività

Maria Luisa Navacchia

Istituto per la Sintesi Organica e la Fotoreattività

Vincenzo Palermo

Chalmers, Industrial and Materials Science, Materials and manufacture

Istituto per la Sintesi Organica e la Fotoreattività

M. Melucci

Istituto per la Sintesi Organica e la Fotoreattività

Nanoscale

2040-3364 (ISSN)

11 22780-22787

Subject Categories

Physical Chemistry

Theoretical Chemistry

Condensed Matter Physics

Areas of Advance

Production

Materials Science

DOI

10.1039/c9nr06897j

PubMed

31577323

More information

Latest update

12/16/2019