Supporting InformationWaste cigarette filter as nanofibrous membranes for on-demand immiscible

oil/water mixtures and emulsions separationWeimin Liu‡a, Mengke Cui‡a, Yongqian Shen*,b, Guorong Zhua Lan Luoa Mouji Lia,

Jian Li*,a

a College of Chemistry and Chemical Engineering, Northwest Normal University, Gansu International Scientific and Technological Cooperation Base of Water-retention Chemical Functional Materials, Research Center of Gansu Military and Civilian Integration Advanced Structural Materials, Lanzhou 730070, P. R. China.b State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Key Laboratory of Nonferrous Metal alloys and Processing, Ministry of Education, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China.

*a* Corresponding author. Tel.: +86 931 7971533.E-mail address:jianli83@126.com (J. Li).*b* Corresponding author. Tel.: + 86 931 2976688.E-mail address: syqch@163.com (Y. Shen).‡ These authors contributed equally.

Supplementary figure and movieFig. S1 Optical images of the waste cigarette filters.

Fig. S2 Pore size distribution and average pore size of as-prepared CFCMs-2300.

Fig. S3 The EDX mapping of the CFCMs-2300.

Fig. S4 Optical images of the CFCM before and after bending over 200 times.

Fig. S5 Stability tests of the various types of emulsions, after 30 days, the

emulsions are still stable without demulsification.

Fig. S6 Droplet size measurements of different surfactant-stabilized emulsions for

(a), diesel-in-water emulsion, (c) hexane-in-water emulsion, (e) petroleum ether-in-

water emulsion and (g) trichloromethane-in-water emulsion. Optical microscope

images and digital photographs of the separation results for various types of

surfactant-stabilized oil-in-water emulsions: (b) diesel-in-water emulsion, (d) hexane-

in-water emulsion, (f) petroleum ether-in-water emulsion and (h) trichloromethane-in-

water emulsion. After the separation, all the emulsions become transparent and no oil

droplets can be observed in the filtrates.

Fig. S7 Droplet size measurements of different surfactant-stabilized emulsions for

(a) water-in-diesel emulsion, (c) water-in-hexane emulsion, (e) water-in-petroleum

ether emulsion and (g) water-in-trichloromethane emulsion. Optical microscope

images and digital photographs of the separation results for various types of

surfactant-stabilized oil-in-water emulsions: (b) water-in-diesel emulsion, (d) water-

in-hexane emulsion, (f) water-in-petroleum ether emulsion and (h) water-in-

trichloromethane emulsion. After the separation, all the emulsions become transparent

and no water droplets can be observed in the filtrates.

Fig. S8 The wettability and oil/water separation of the original stainless steel (300 mesh size) mesh.Movie S1 Low adhesion of underwater oil droplet on the CFCMs-2300.

Fig. S1 Optical images of the waste cigarette filters.

Fig. S2 Pore size distribution and average pore size of as-prepared CFCMs-2300.

Fig. S3 The EDX mapping of the CFCMs-2300.

Fig. S4 Optical images of the CFCM before and after bending over 200 times.

Fig. S5 Stability tests of the various types of emulsions, after 30 days, the emulsions

are still stable without demulsification.

Fig. S6 Droplet size measurements of different surfactant-stabilized emulsions for

(a), diesel-in-water emulsion, (c) hexane-in-water emulsion, (e) petroleum ether-in-

water emulsion and (g) trichloromethane-in-water emulsion. Optical microscope

images and digital photographs of the separation results for various types of

surfactant-stabilized oil-in-water emulsions: (b) diesel-in-water emulsion, (d) hexane-

in-water emulsion, (f) petroleum ether-in-water emulsion and (h) trichloromethane-in-

water emulsion. After the separation, all the emulsions become transparent and no oil

droplets can be observed in the filtrates.

Fig.S7 Droplet size measurements of different surfactant-stabilized emulsions for (a)

water-in-diesel emulsion, (c) water-in-hexane emulsion, (e) water-in-petroleum ether

emulsion and (g) water-in-trichloromethane emulsion. Optical microscope images and

digital photographs of the separation results for various types of surfactant-stabilized

oil-in-water emulsions: (b) water-in-diesel emulsion, (d) water-in-hexane emulsion,

(f) water-in-petroleum ether emulsion and (h) water-in-trichloromethane emulsion.

After the separation, all the emulsions become transparent and no water droplets can

be observed in the filtrates.

Fig. S8 the wettability and oil/water separation of the original stainless steel (300

mesh size) mesh.