A free-standing superhydrophobic film for highly efficient removal of water from turbine oil

doi:10.1007/s11705-018-1754-3

Front. Chem. Sci. Eng.

2019, Vol. 13

Issue (2) : 393-399 https://doi.org/10.1007/s11705-018-1754-3

RESEARCH ARTICLE

A free-standing superhydrophobic film for highly efficient removal of water from turbine oil

Fan Shu¹, Meng Wang¹, Jinbo Pang², Ping Yu¹(

)

¹. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
². Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan 250022, China

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Abstract

A free-standing superhydrophobic film is prepared by sequentially dip-coating a commercially available filter paper with nano SiO₂ suspension, epoxy emulsion, and octyltrimethoxysilane solution. A surface with micro- or nano-roughness is formed because SiO₂ nanoparticles are uniformly and firmly adhered on the backbone of the filter paper by the cured epoxy resin. Furthermore, the surface energy is significantly reduced because of introducing octytrimethoxysilane. Such a surface structure makes the prepared film a superhydrophobic material. Due to its free-standing nature, this superhydrophobic film can be used to remove water from turbine oil by filtration. The efficiency of water removal is high (up to 94.1%), and the filtration process is driven solely by gravity without extra energy consumption. Because of the facile fabrication process and the high efficiency of water removal, this free-standing superhydrophobic film may find application in power industry.

Keywords superhydrophobicity nanoparticles dip coating epoxy emulsion turbine oil

Corresponding Author(s): Ping Yu

Just Accepted Date: 13 June 2018 Online First Date: 12 December 2018 Issue Date: 22 May 2019

Cite this article:

Fan Shu,Meng Wang,Jinbo Pang, et al. A free-standing superhydrophobic film for highly efficient removal of water from turbine oil[J]. Front. Chem. Sci. Eng., 2019, 13(2): 393-399.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1754-3
https://academic.hep.com.cn/fcse/EN/Y2019/V13/I2/393

Fig.1 (a) Schematic view of the preparative procedure for the superhydrophobic functional films coated filter paper; (b) a digital image of the superhydrophobic functional films coated filter paper with a water droplet resting on it

Fig.2 SEM images of filter papers: (a) the original filter paper, (b) treated with 1wt-% curing agent, (c) treated with 2.5wt-% curing agent, (d) treated with 4wt-% curing agent, and (e) treated with 5.5wt-% curing agent; (f) water contact angles of prepared filter papers vs. concentrations of curing agent (insets display the detailed water contact angle measurements)

Fig.3 Energy dispersion X ray spectra (EDS) of filter paper samples: (a) a universal original filter paper and (b) a functional film coated filter paper. The tables shows the content of different elements

Fig.4 TGA of the prepared filter paper

Fig.5 Photographs and optical images of turbine oils before and after water removal: (a) the initial water/oil emulsions, numbers 1, 2, 3, 4, and 5 represent emulsions with water contents of 85.7, 107.83, 160.37, 248.9 and 294.13 mg?L⁻¹, respectively, and (b) the filtrates, numbers 1′ to 5′ represent the filtrates of emulsions 1 to 5, respectively. The scale bar in all these images is 100 µm

Tab.1 Removal efficiency

Tab.2 Initial water content

Tab.3 Final water content

Fig.6 Removal efficiency vs. the initial water content

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