TY - JOUR
T1 - Fabrication of robust, superhydrophobic-superoleophilic PVA sponge by one-pot hydrothermal method for oil-water separation
AU - Bai, Chaoyun
AU - Hu, Chuanbo
AU - Ni, Peiyuan
AU - Zhang, Xin
AU - Zhang, Wenxin
AU - Zhang, Si
AU - Tang, Jianting
AU - Li, Tingzhen
AU - Li, Ying
N1 - This research was funded by the National Natural Science Foundation of China (Grant Nos. 51773173 and 81973288), the Natural Science Foundation of Chongqing (Grant No. cstc2021jcyj-msxmX1139), the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant Nos. KJQN201901210 and KJQN202001234), the Opening Fund of National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology (Grant No. SF202206), and the Science and Technology Development Project of Guangdong Academy of Science (Grant No. 2020GDASYL-20200103131). The authors would also like to thank MogoEdit (https://www.mogoedit.com) for providing the English editing when revising this manuscript.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/4
Y1 - 2023/4
N2 - Superhydrophobic surfaces have promising application prospects in the field of oil-water separation. In this study, a superhydrophobic-superoleophilic polyvinyl alcohol sponge modified by stearic acid/nano-TiO2 particles (referred to as STt@PVA, where S, T and t denoted stearic acid, nano-TiO2 particles with diameters of 50 nm and 20 nm, respectively) was constructed for oil-water separation. The results showed that STt@PVA had a water contact angle (WCA) of 163°, a water sliding angle (WSA) of less than 3° and an oil contact angle (OCA) of 0°. Moreover, the oil can be completely adsorbed within 1 s, indicating that the functional PVA sponge can effectively separate and adsorb the organic solvents or oils in oil-water mixtures. The oil-water separation results showed that the modified sponge could adsorb 5 - 8 times more oil than its own mass. After being reused for 5 times, the sponge could still maintain the oil sorption capacity of 5 times of its own mass, and the separation efficiency remained above 83%. In addition, in order to demonstrate its performance in actual oil pollution treatment, the durability, robustness, acid and alkali resistance and self-cleaning ability of STt@PVA were also analyzed. The results showed that the reasonably designed superhydrophobic-superoleophilic functional PVA sponge had the advantages of easy preparation, low cost, recyclability and strong robustness, and had great practical application potential in the processing of oil-bearing wastewaters and oil spills.
AB - Superhydrophobic surfaces have promising application prospects in the field of oil-water separation. In this study, a superhydrophobic-superoleophilic polyvinyl alcohol sponge modified by stearic acid/nano-TiO2 particles (referred to as STt@PVA, where S, T and t denoted stearic acid, nano-TiO2 particles with diameters of 50 nm and 20 nm, respectively) was constructed for oil-water separation. The results showed that STt@PVA had a water contact angle (WCA) of 163°, a water sliding angle (WSA) of less than 3° and an oil contact angle (OCA) of 0°. Moreover, the oil can be completely adsorbed within 1 s, indicating that the functional PVA sponge can effectively separate and adsorb the organic solvents or oils in oil-water mixtures. The oil-water separation results showed that the modified sponge could adsorb 5 - 8 times more oil than its own mass. After being reused for 5 times, the sponge could still maintain the oil sorption capacity of 5 times of its own mass, and the separation efficiency remained above 83%. In addition, in order to demonstrate its performance in actual oil pollution treatment, the durability, robustness, acid and alkali resistance and self-cleaning ability of STt@PVA were also analyzed. The results showed that the reasonably designed superhydrophobic-superoleophilic functional PVA sponge had the advantages of easy preparation, low cost, recyclability and strong robustness, and had great practical application potential in the processing of oil-bearing wastewaters and oil spills.
KW - Oil-water separation
KW - PVA sponge
KW - Recyclability
KW - Superhydrophobic
KW - Wettability
UR - http://www.scopus.com/inward/record.url?scp=85147302756&partnerID=8YFLogxK
U2 - 10.1016/j.surfin.2023.102679
DO - 10.1016/j.surfin.2023.102679
M3 - Journal article
AN - SCOPUS:85147302756
SN - 2468-0230
VL - 37
JO - Surfaces and Interfaces
JF - Surfaces and Interfaces
M1 - 102679
ER -
