University of Oulu

RSC Adv.,2021,11,5035,

Effective oil–water mixture separation and photocatalytic dye decontamination through nickel-dimethylglyoxime microtubes coated superhydrophobic and superoleophilic films

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Author: Ma, Jinxiu1; Meng, Wen1; Zhang, Lahong1;
Organizations: 1College of Chemistry, Key Lab of Environment Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, China
2Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Royal Society of Chemistry, 2021
Publish Date: 2021-04-26


Oils and solvable organic pollutants in wastewater demand separations of the components along with efficient photocatalysis in water treatment. Herein, we report on a practical purification strategy by using the multifunctional nickel-dimethylglyoxime [Ni(DMG)₂] microtubes to separate the liquid mixture and degrade organic pollutants. The self-assembled [Ni(DMG)₂] tubes was synthesized by a facile co-precipitation method. The static contact angle of the film prepared by mixing [Ni(DMG)₂] powder (1 : 2 wt%) into polydimethylsilicone (PDMS) to water can reach 161.3°, which can still remain superhydrophobic but oil-friendly under corrosion conditions. PDMS imparts good mechanical properties and serves as both the adhesive and hydrophobic material. PFOTS methanol solution contains a large number of low surface energy groups, which can reduce the surface free energy of [Ni(DMG)₂] rough structure. The superhydrophobic rough surface prepared by hollow micron tubular [Ni(DMG)₂] samples must have both low surface energy substance and hollow micron tubular morphology. Due to the unique wettability, oil and water were efficiently separated from the oil–water mixture through the films. The coated film itself is photocatalytic in degrading quinoline blue, rhodamine B, methyl orange and methylene blue. By using the film’s multifunctionality, a practical wastewater treatment was realized via water–oil separation, followed by fast photocatalytic degradation of solvable dyes.

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Series: RSC advances
ISSN: 2046-2069
ISSN-E: 2046-2069
ISSN-L: 2046-2069
Volume: 11
Issue: 9
Pages: 5035 - 5043
DOI: 10.1039/d0ra09240a
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
215 Chemical engineering
218 Environmental engineering
Funding: The authors acknowledge with thanks the financial support of the National Natural Science Foundation of China (21601149) and Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization. Feng Li thanks the support of China Scholarship Council.
Copyright information: © 2021 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.