Superwetting TiO 2 -decorated single-walled carbon nanotube composite membrane for highly efficient oil-in-water emulsio
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Superwetting TiO2-decorated single-walled carbon nanotube composite membrane for highly efficient oil-in-water emulsion separation Yahong Sun*, Ruiguang Zhao**, Quanyong Wang***, Yuanyuan Zheng*, Gongrang Li****, Dejun Sun**, Tao Wu**,†, and Yujiang Li*,† *Shandong Provincial Research Center for Water Pollution Control, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, P. R. China **Key Laboratory of Colloid and Interface Science of Education Ministry, Shandong University, Jinan, 250100, P. R. China ***China Urban Construction Design & Research Institute Co. LTD. Jinan, 250101, P. R. China ****Drilling Technology Research Institute, Shengli Petroleum Engineering Corporation Limited of SINOPEC, Dongying, 257017, P. R. China (Received 5 January 2020 • Revised 9 May 2020 • Accepted 20 May 2020) AbstractWith the advantages of one-dimensional hollow structure, high porosity and prominent mechanical strength, single-walled carbon nanotubes (SWCNTs) have been extensively utilized to improve conventional filtration membranes for oil/water separation. Their intrinsic hydrophobicity, however, adversely affects the anti-fouling performance of the SWCNT membrane. Herein, a super-hydrophilic and underwater super-oleophobic hierarchical modified membrane with enhanced permeability and anti-fouling property was fabricated using the vacuum-assisted filtration technique by synergistically assembling SWCNTs and titanium dioxide (TiO2) nanoparticles on a cellulose acetate membrane. Highly dispersed SWCNTs were obtained by carboxylating treatment of agglomerate SWCNTs. The controlled stacking of SWCNTs fibers and a controllable amount of TiO2 rendered a modified membrane with high porosity and hierarchical structure, leading to an ultrahigh water flux up to 4,777.07 L·m2·h1, and excellent separation performance with efficiency greater than 99.47%. Most importantly, the membrane exhibited excellent anti-fouling ability during ten cycles with the aid of the super-wetting property of TiO2 nanoparticles. The results indicated that coating TiO2 nanoparticles on SWCNTs modified the surface topography of the obtained SWCNT/TiO2 membrane, which improved hydrophilicity, permeability and anti-fouling property, manifesting attractive potential applications in oil/water separation. Keywords: Oil-in-water Emulsions, Super-hydrophilic, Underwater Super-oleophobic, SWCNT/TiO2 Membranes, SWCNT Membrane
The utilization of membrane technology provides a potential solution for microsized oily wastewater [18]. It has been acknowledged that membrane technology can reject micron-sized particles and molecules due to its molecular sieving effect, coupled with its unique surface properties and surface structure, and has been successfully applied for the separation of various emulsions [19,20]. Moreover, owing to its green and simple operation, and energyefficient and continuous operation advantages, membrane technology has been extensively emp
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