TY - JOUR
T1 - Photoredox Catalysis for the Fabrication of Water-Repellent Surfaces with Application for Oil/Water Separation
AU - Xiao, Yelan
AU - Cheng, Shun Cheung
AU - Feng, Yongyi
AU - Shi, Zhen
AU - Huang, Zhenjia
AU - Tsui, Gary
AU - Arava, Clement Manohar
AU - Roy, Vellaisamy A.L.
AU - Ko, Chi Chiu
N1 - Funding Information:
This work was supported by the General Research Fund (Project Nos. CityU 11306819 and CityU 11306820) from the Research Grants Council of the Hong Kong SAR, China. Y.X. acknowledges receipt of a University Postgraduate Studentship administrated by City University of Hong Kong. The Advanced Coatings Applied Research Laboratory from Department of Mechanical and Biomedical Engineering of City University of Hong Kong is acknowledged for contact angle measurement. The State Key Laboratory of Ultra-Precision Machining Technology of the Hong Kong Polytechnic University is acknowledged for surface roughness characterization using a 3D optical profiler and contact angle measurement.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/10/5
Y1 - 2021/10/5
N2 - Silanization processes with perfluoroalkyl silanes have been demonstrated to be effective in developing advanced materials with many functional properties, including hydrophobicity, water repellency, and self-cleaning properties. However, practical industrial applications of perfluoroalkyl silanes are limited by their extremely high cost. On the basis of our recent work on photoredox catalysis for amidation with perfluoroalkyl iodides, its application for surface chemical modification on filter paper, as an illustrative example, has been developed and evaluated. Before photocatalytic amidation, the surface is functionalized with amine functional groups by silanization with 3-(trimethoxysilyl)propylamine. All chemically modified surfaces have been fully characterized by attenuated total reflection infrared (ATR-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and three-dimensional (3D) profiling to confirm the successful silanization and photocatalytic amidation. After surface modification of the filter papers with perfluoroalkanamide, they show high water repellency and hydrophobicity with contact angles over 120°. These filter papers possess high wetting selectivity, which can be used to effectively separate the organic and aqueous biphasic mixtures. The perfluoroalkanamide-modified filter papers can be used for separating organic/aqueous biphasic mixtures over many cycles without lowering the separating efficiency, indicating their reusability and excellent durability.
AB - Silanization processes with perfluoroalkyl silanes have been demonstrated to be effective in developing advanced materials with many functional properties, including hydrophobicity, water repellency, and self-cleaning properties. However, practical industrial applications of perfluoroalkyl silanes are limited by their extremely high cost. On the basis of our recent work on photoredox catalysis for amidation with perfluoroalkyl iodides, its application for surface chemical modification on filter paper, as an illustrative example, has been developed and evaluated. Before photocatalytic amidation, the surface is functionalized with amine functional groups by silanization with 3-(trimethoxysilyl)propylamine. All chemically modified surfaces have been fully characterized by attenuated total reflection infrared (ATR-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and three-dimensional (3D) profiling to confirm the successful silanization and photocatalytic amidation. After surface modification of the filter papers with perfluoroalkanamide, they show high water repellency and hydrophobicity with contact angles over 120°. These filter papers possess high wetting selectivity, which can be used to effectively separate the organic and aqueous biphasic mixtures. The perfluoroalkanamide-modified filter papers can be used for separating organic/aqueous biphasic mixtures over many cycles without lowering the separating efficiency, indicating their reusability and excellent durability.
UR - http://www.scopus.com/inward/record.url?scp=85116545926&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.1c01926
DO - 10.1021/acs.langmuir.1c01926
M3 - Journal article
C2 - 34558895
AN - SCOPUS:85116545926
SN - 0743-7463
VL - 37
SP - 11592
EP - 11602
JO - Langmuir
JF - Langmuir
IS - 39
ER -