Preparation of porous PTFE /C composite foam and its application in gravity‐driven oil–water separation

Porous Al2O3 membranes were prepared through a phase-inversion tape casting/sintering method. The alumina membranes were embedded with finger-like pores perpendicular to the membrane surface. Bare alumina membranes are naturally hydrophilic and underwater oleophobic, while fluoroalkylsilane (FAS)-grafted membranes are hydrophobic and oleophilic. The coupling of FAS molecules on alumina surfaces was confirmed by Thermogravimetric Analysis and X-ray Photoelectron Spectroscopy measurements. The hydrophobic membranes exhibited desired thermal stability and were super durable when exposed to air. Both membranes can be used for gravity-driven oil/water separation, which is highly cost-effective. The as-calculated separation efficiency (R) was above 99% for the FAS-grafted alumina membrane. Due to the excellent oil/water separation performance and good chemical stability, the porous ceramic membranes display potential for practical applications.

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Controlling Superwettability by Microstructure and Surface Energy Manipulation on Three-Dimensional Substrates for Versatile Gravity-Driven Oil/Water Separation

ACS Applied Materials & Interfaces ◽

10.1021/acsami.7b10901 ◽

2017 ◽

Vol 9 (43) ◽

pp. 37529-37535 ◽

Cited By ~ 28

Author(s):

Hao-Yang Mi ◽

Xin Jing ◽

Han-Xiong Huang ◽

Lih-Sheng Turng

Keyword(s):

Surface Energy ◽

Three Dimensional ◽

Water Separation ◽

Oil Water Separation ◽

Gravity Driven ◽

Oil Water

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Reusable, salt-tolerant and superhydrophilic cellulose hydrogel-coated mesh for efficient gravity-driven oil/water separation

Chemical Engineering Journal ◽

10.1016/j.cej.2018.01.045 ◽

2018 ◽

Vol 338 ◽

pp. 271-277 ◽

Cited By ~ 60

Author(s):

Chenghong Ao ◽

Rui Hu ◽

Jiangqi Zhao ◽

Xiaofang Zhang ◽

Qingye Li ◽

...

Keyword(s):

Salt Tolerant ◽

Water Separation ◽

Cellulose Hydrogel ◽

Oil Water Separation ◽

Gravity Driven ◽

Oil Water

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Chelation Assembly of Cellulose Nanohydrogel onto Flower-Like Structured Foam with Underwater Superoleophobicity for Highly Efficient Oil–Water Separation

NANO ◽

10.1142/s1793292021500612 ◽

2021 ◽

pp. 2150061

Author(s):

Yuntian Wan ◽

Xue Lin ◽

Zhongshuai Chang ◽

Xiaohui Dai ◽

Jiangdong Dai

Keyword(s):

Water Flux ◽

Separation Performance ◽

Layer By Layer ◽

Potential Candidate ◽

Oily Wastewater ◽

Water Separation ◽

Composite Foam ◽

Oil Water Separation ◽

Oil Water ◽

Underwater Superoleophobicity

Currently, with the increasingly serious pollution problem of oily wastewater, it is urgent to develop advanced materials and methods. In this work, a Fe(III)-CMC@Ni(OH)2@Ni composite foam with superhydrophilic and underwater superoleophobicity was fabricated by an in situ growth of flower-like Ni(OH)2 nanoparticles and chelated assembly of Fe(III)-CMC nanohydrogel via a layer-by-layer self assembly using Fe[Formula: see text] ion and carboxymethyl cellulose (CMC). The composite foam could separate various oil/water mixtures and exhibited excellent efficiency over 99%. This foam possessed ultrahigh water flux (220000[Formula: see text]L m[Formula: see text] h[Formula: see text] and better resistant to penetration pressure (1.3[Formula: see text]kPa). After 30 cycles, the oil–water separation performance reduced only 0.5%, but the foam structure was still stable that guarantees a better lifetime. Besides, this composite foam showed anti-fouling, unique durability and excellent corrosion resistance performance. Taking into account all good properties, Fe(III)-CMC@Ni(OH)2@Ni composite foam was expected to be a potential candidate for responding to all kinds of complex oily wastewater conditions.

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