title: Eco-Friendly Superwetting Material for Highly Effective Separations of Oil/Water Mixtures and Oil-in-Water Emulsions.
abstract: Because the treatment of oily wastewater, generated from many industrial processes, has become an increasing environmental concern, the search continues for simple, inexpensive, eco-friendly, and readily scalable processes for fabricating novel materials capable of effective oil/water separation. In this study we prepared an eco-friendly superhydrophilic and underwater superoleophobic polyvinylpyrrolidone (PVP)-modified cotton that mediated extremely efficient separations of mixtures of oil/water and oil/corrosive solutions. This PVP-modified cotton exhibited excellent antifouling properties and could be used to separate oil/water mixtures continuously for up to 20 h. Moreover, the compressed PVP-modified cotton could separate both surfactant-free and -stabilized oil-in-water emulsions with fluxes of up to 23,500 L m-2h-1bar-1-a level one to two orders of magnitude higher than that possible when using traditional ultrafiltration membranes having similar rejection properties. The high performance of our PVP-modified cotton and its green, low-energy, cost-effective preparation suggest its great potential for practical applications.
authors.affiliation: Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 840, Taiwan.
authors.forename: Chih-Feng
authors.initials: CF
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 840, Taiwan.
authors.forename: Sheng-Yi
authors.initials: SY
authors.lastname: Yang
authors.affiliation: Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan.
authors.forename: Shiao-Wei
authors.initials: SW
authors.lastname: Kuo