title: Thioether-functionalized mesoporous fiber membranes: sol-gel combined electrospun fabrication and their applications for Hg2+ removal.
abstract: Mesoporous polyvinylpyrrolidone (PVP)/SiO(2) composite nanofiber membranes functionalized with thioether groups have been fabricated by a combination method of sol-gel process and electrospinning. The precursor sol was synthesized by one-step co-condensation of tetraethyl orthosilicate (TEOS) and 1,4-bis(triethoxysilyl)propane tetrasulfide (BTESPTS, (CH(3)CH(2)O)(3)Si(CH(2))(3)S-S-S-S(CH(2))(3)Si-(OCH(2)CH(3))(3)), with the triblock copolymer poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (P123, EO(20)PO(70)EO(20)) as template. After the addition of PVP, nanofiber membranes were prepared by electrospinning. The membranes were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) images, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), N(2) adsorption-desorption isotherms, and an Elementar Vario EL analyzer. The composites were used as highly selective adsorbents for Hg(2+) due to the modification with thioether groups (-S-), and were conveniently separated from the waste water. The composite could be regenerated through acidification.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse Study, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, People's Republic of China.
authors.forename: Minmin
authors.initials: M
authors.lastname: Teng
authors.forename: Hongtao
authors.initials: H
authors.lastname: Wang
authors.forename: Fengting
authors.initials: F
authors.lastname: Li
authors.forename: Bingru
authors.initials: B
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D005782:Gels / Q000737:chemistry; D008567:Membranes, Artificial; D008628:Mercury / Q000737:chemistry / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000378:metabolism*; D016062:Porosity; D011205:Povidone / Q000737:chemistry; D011409:Propylene Glycols / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000138:chemical synthesis* / Q000737:chemistry; D014873:Water Pollutants / Q000737:chemistry; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D005782:Gels; D008567:Membranes, Artificial; C116176:PEO-PPO-PEO; D011108:Polymers; D011409:Propylene Glycols; D013440:Sulfides; D014873:Water Pollutants; D011092:Polyethylene Glycols; D012822:Silicon Dioxide; D008628:Mercury; D011205:Povidone