Hierarchical Hybrid K-OMS-2/TiO2 Nanofibrous Membrane for Water Treatment
- Tong ZhangTong ZhangSchool of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798More by Tong Zhang and
- Darren Delai Sun*
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/m2·h (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.