Hierarchical Hybrid K-OMS-2/TiO2 Nanofibrous Membrane for Water Treatment

  • Tong Zhang
    Tong Zhang
    School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798
    More by Tong Zhang
  •  and 
  • Darren Delai Sun*
    Darren Delai Sun
    School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798
    *E-mail: [email protected]. Tel: +65 6790 6273
DOI: 10.1021/bk-2013-1124.ch014
Publication Date (Web):April 17, 2013
Sustainable Nanotechnology and the Environment: Advances and Achievements
Chapter 14pp 267-276
ACS Symposium SeriesVol. 1124
ISBN13: 9780841227842eISBN: 9780841227859
Copyright © 2013 American Chemical Society
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Abstract

This chapter presents a novel free-standing nanofibrous microfiltration membrane made by hierarchical hybrid K-OMS-2/TiO2 nanowires for the removal of organic pollutants in water. The K-OMS-2/TiO2 nanowire was around 10 µm in length with the high density secondary TiO2 hair-like structures (20-40 nm) anchored on surfaces of primary underlying K-OMS-2 nanowires. At 30 L/mh (LMH) membrane flux, the color and total organic carbon (TOC) removal rates were 90 % and 50%, respectively. Clearly, the organics (AO 7) will be filtered directly by membrane pores with external pressure, and the smaller ones would be adsorbed onto the nanowires via an adsorption process that is greatly enhanced by the hydrophobic nature of the supporting K-OMS-2 nanowires, as well as large surface area of the hierarchical nanowires. The organic pollutants on the photocatalytic membrane were simultaneously degraded by the PCO process under a UV light, alleviating membrane pore blocking by small organic molecules, thus maintaining a constant permeate flux.