Photocatalytic fibers

Moafi et al. [143] studied the ability of titania versus zirconia to photocatalyze methylene blue and eosin yellow on polyacrylonitrile fibers. Ti02 particles ranging from 10-20 nm in size and Zr02 particles ranging from 20-40 nm in size were dispersed on the fiber surface. Photocatalytic activity of Ti02 was greater. 

Moafi, H.F., Shojaie, A.F. and Zanjanchi, M.A. (2010) The comparative study of photocatalytic self-deaning properties ofsynfhesized nanoscale titania and zirconia onto polyacrylonitrile fibers. Journal of Applied Polymer Science, 118, 2062-2070. 

Bedford, N.M. and Steckl, A.J. (2010) Photocatalytic self cleaning textile fibers by coaxial electrospinning. ACS Applied Materials ej Interfaces, 2, 2448-2455. 

Strong Photocatalytic Fiber (Titania/Silica Fiber) Produced... 

Natural nuclear reactors, 17 589 25 397 Natural organic polymers, manufactured fibers produced from, 24 616 Natural photocatalytic processes, in the environment, 19 100-101 Natural plant growth regulators, 13 22-28 Natural polymer hollow fibers, 16 23... 

W.Y. Choi, J.Y. Ko, H.W. Park, J.S. Chung, Investigation on TiC>2 -coated optical fibers for gas-phase photocatalytic oxidation of acetone, Appl. Catal. B Environ. 31 (2001) 209-220. 

In a similar way, a well-adhered surface modification of BC fibers can be achieved with Ti(>2 nanoparticles (with a diameter of about 10 nm) by the hydrolysis of titanium tetraisopropanolate adsorbed onto the fibers. It was observed that the titania-coated surface appears to be dense and have low porosity and to consist of near-spherical grains. By washing with sodium carbonate solution, the TiC>2 films were not removed during neutralization. It seems that the particles have formed strong interactions with BC. The coated membranes showed substantial bactericidal properties under UV radiation and white light (containing a small fraction of UV) conditions, too. This effect is caused by the photocatalytic destruction of the bacterial cells. 

Choi W, Ko JY, Park H, Chung JS (2001) Investigation on Ti02-coated Optical Fibers for Gas-phase Photocatalytic Oxidation of Acetone, Appl. Catal. B Environ. 31 209-220. 

A recent example is the optical fiber monolith reactor, reported by Lin and Valsaraj (208). They used a monolith for photocatalytic wastewater treatment with the channels of the monolith completely filled with flowing liquid. The monolith structure was used merely as the distributor of the optical fibers, but the benefits of monolith, such as low-pressure drop and excellent mass transfer characteristics for multiphase systems, were not fully exploited. 

Different photocatalytic reactor configurations are reported in the literature including annular reactor with a small thin film of catalyst coated on the iimer surface of the outer annulus, flat-plate fluidized beds, annular packed beds, and catalyst coated on honeycombed monoliths, porous fibrous mesh, and optical fiber bundles (31,32). 

CHEMILUMINESCENT AND ELECTRON SPIN RESONANCE SPECTROSCOPIC MEASUREMENTS OF REACTIVE OXYGEN SPECIES GENERATED IN WATER TREATED WITH TITANIA-COATED PHOTOCATALYTIC FIBERS... 

Apparatus. For preparation of ROS-containing water, photocatalytic apparatus designated exPCAW-1 (fabricated by K2R Inc., Kitakyushu, Japan) was used. It comprised an ultraviolet (UV-A) emitting bulb, ultrasonic wave (USW) generating devices, sheets of titania-coated fiber, a pumping system and gas (02 or NO) supply systems. As circulated in the exPCAW-1, water is treated with UV, USW and 02, enabling the photo-catalytic oxidative conditioning of the water. 

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