Abstract
A simple, convenient, reusable, and inexpensive air- and water-purification unit including a one-end sealed porous amorphous-silica (a-silica) tube coated with TiO2 photocatalyst layers has been developed. The porous a-silica layers were formed through outside vapor deposition (OVD). TiO2 photocatalyst layers were formed through impregnation and calcination onto a-silica layers. The resulting porous TiO2-impregnated a-silica tubes were evaluated for air-purification capacity using an acetaldehyde gas decomposition test. The tube (8.5 mm e.d. × 150 mm) demonstrated a 93% removal rate for high concentrations (ca. 300 ppm) of acetaldehyde gas at a single-pass condition with a 250 mL/min flow rate under UV irradiation. The tube also demonstrated a water purification capacity at a rate 2.0 times higher than a-silica tube without TiO2 impregnation. Therefore, the tubes have a great potential for developing compact and in-line VOC removal and water-purification units.
Highlights
Photocatalytic environmental purification, VOC removal, has received increased attention owing to its low cost and enduring stability
The Raman bands of the TiO2-impregnated a-silica tube at 142, 194, 396, 514, and cm−1 are nearly identical to the spectrum of the anatase phase [7]
Raman spectroscopy indicates that the TiO2 particles in the TiO2-impregnated a-silica tube consisted of anatase crystals
Summary
Photocatalytic environmental purification, VOC removal, has received increased attention owing to its low cost and enduring stability. Popularly used photocatalysts and photocatalytic filters are significantly limited in their application due to relatively low purification efficiency and difficulty in handling the powder. We have reported various methods for the design and application of a TiO2 photocatalyst to maximize its photocatalytic abilities [1,2,3,4]. The impregnation method was used to fill TiO2 precursor deep into the pores of one-end sealed porous a-silica tubes. The porous a-silica tubes were assayed for their VOC removal ability through an acetaldehyde decomposition test. The water purification ability of these tubes was preliminarily evaluated through the methylene blue decolorization test. These tests revealed more efficient materials, with emphasis on their ability to remove VOC
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