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Open AccessArticle

Effects of Protonation, Hydroxylamination, and Hydrazination of g-C3N4 on the Performance of Matrimid®/g-C3N4 Membranes

1
Department of Agroforestry Sciences, ETSIIAA, University of Valladolid, Avenida de Madrid 44, 34004 Palencia, Spain
2
SMAP, UA-UVa_CSIC, Associated Research Unit to CSIC, Universidad de Valladolid, Paseo Belén 7, 47011 Valladolid, Spain
3
Agriculture and Forestry Engineering Department, ETSIIAA, Universidad de Valladolid, Avenida de Madrid 44, 34004 Palencia, Spain
4
Department of Agricultural and Environmental Sciences, Instituto Universitario de Investigación en Ciencias Ambientales (IUCA), EPS, Universidad de Zaragoza, Carretera de Cuarte s/n, 22071 Huesca, Spain
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1010; https://doi.org/10.3390/nano8121010
Received: 29 October 2018 / Revised: 24 November 2018 / Accepted: 4 December 2018 / Published: 5 December 2018
One of the challenges to continue improving polymeric membranes properties involves the development of novel chemically modified fillers, such as nitrogen-rich 2-D nanomaterials. Graphitic carbon nitride (g-C3N4) has attracted significant interest as a new class of these fillers. Protonation is known to afford it desirable functionalities to form unique architectures for various applications. In the work presented herein, doping of Matrimid® with protonated g-C3N4 to yield Matrimid®/g-C3N4 mixed matrix membranes was found to improve gas separation by enhancing the selectivity for CO2/CH4 by up to 36.9% at 0.5 wt % filler doping. With a view to further enhancing the contribution of g-C3N4 to the performance of the composite membrane, oxygen plasma and hydrazine monohydrate treatments were also assayed as alternatives to protonation. Hydroxylamination by oxygen plasma treatment increased the selectivity for CO2/CH4 by up to 52.2% (at 2 wt % doping) and that for O2/N2 by up to 26.3% (at 0.5 wt % doping). Hydrazination led to lower enhancements in CO2/CH4 separation, by up to 11.4%. This study suggests that chemically-modified g-C3N4 may hold promise as an additive for modifying the surface of Matrimid® and other membranes. View Full-Text
Keywords: carbon nitride; CO2/CH4; gas separation; Matrimid® 5218; mixed matrix membrane; O2/N2 carbon nitride; CO2/CH4; gas separation; Matrimid® 5218; mixed matrix membrane; O2/N2
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MDPI and ACS Style

Soto-Herranz, M.; Sánchez-Báscones, M.; Hérnandez-Giménez, A.; Calvo-Díez, J.I.; Martín-Gil, J.; Martín-Ramos, P. Effects of Protonation, Hydroxylamination, and Hydrazination of g-C3N4 on the Performance of Matrimid®/g-C3N4 Membranes. Nanomaterials 2018, 8, 1010.

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